S-19405 Series
AUTOMOTIVE, 125°C OPERATION,
3.8 μA CURRENT CONSUMPTION
WATCHDOG TIMER WITH RESET FUNCTION
www.ablic.com
© ABLIC Inc., 2017-2018 Rev.1.2_00
1
The S-19405 Series is a watchdog timer developed using CMOS technology, which can operate with low current
consumption of 3.8 μA typ. The reset function and the low voltage detection function are available.
Caution This product can be used in vehicle equipment and in-vehicle equipment. Before using the product in
the purpose, contact to ABLIC Inc. is indispensable.
Features
• Detection voltage: 2.0 V to 5.0 V, selectable in 0.1 V step
• Detection voltage accuracy: ±2.0%
• Input voltage: VDD = 0.9 V to 6.0 V
• Hysteresis width: 5% typ.
• Current consumption: 3.8 μA typ.
• Reset time-out period: 14.5 ms typ. (CPOR = 2200 pF)
• Watchdog operation is switchable: Enable, Disable
• Watchdog operation voltage range: VDD = 2.5 V to 6.0 V
• Watchdog input edge is selectable: Rising edge, falling edge
• Operation temperature range: Ta = −40°C to +125°C
• Lead-free (Sn 100%), halogen-free
• AEC-Q100 qualified*1
*1. Contact our sales office for details.
Applications
• Automotive (engine, transmission, suspension, ABS, related-devices for EV / HEV / PHEV, etc.)
Packages
• TMSOP-8
• HSNT-8(2030)
AUTOMOTIVE, 125°C OPERATION, 3.8
μ
A CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
S-19405 Series Rev.1.2_00
2
Block Diagrams
1. S-19405 Series A / B Type
CWDT
WDT circuit
Voltage detection
circuit
Reference
voltage circuit
VDD
VSS
CPOR
WDO
W
EN Noise
filter
WDI Noise
filter
RST
Figure 1
2. S-19405 Series D / E Type
CWDT
WDT circuit
Voltage detection
circuit
Reference
voltage circuit
VDD
VSS
CPOR
WDO
W
EN Noise
filter
WDI Noise
filter
RST
Figure 2
AUTOMOTIVE, 125°C OPERATION, 3.8
μ
A
CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
Rev.1.2_00 S-19405 Series
3
3. S-19405 Series G / H Type
CWDT
WDT circuit
Voltage detection
circuit
Reference
voltage circuit
VDD
VSS
CPOR
WDO
W
EN Noise
filter
WDI Noise
filter
RST
Figure 3
4. S-19405 Series J / K Type
CWDT
WDT circuit
Voltage detection
circuit
Reference
voltage circuit
VDD
VSS
CPOR
WDO
W
EN Noise
filter
WDI Noise
filter
RST
Figure 4
AUTOMOTIVE, 125°C OPERATION, 3.8
μ
A CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
S-19405 Series Rev.1.2_00
4
AEC-Q100 Qualified
This IC supports AEC-Q100 for the operation temperature grade 1.
Contact our sales office for details of AEC-Q100 reliability specification.
Product Name Structure
Users can select the product type, detection voltage, and package type for the S-19405 Series. Refer to "1. Product
name" regarding the contents of product name, "2. Product type list" regarding the product types, "3. Packages"
regarding the package drawings.
1. Product name
S-19405 x xx A - xxxx U 4
Package abbreviation and IC packing specifications*1
K8T2: TMSOP-8, Tape
A8T1: HSNT-8(2030), Tape
Detection voltage
20 to 50
(e.g., when the detection voltage is 2.0 V, it is expressed as 20.)
Environmental code
U: Lead-free (Sn 100%), halogen-free
Operation temperature
A: Ta = −40°C to +125°C
Product type*2
A, B, D, E, G, H, J, K
*1. Refer to the tape drawing.
*2. Refer to "2. Product type list".
2. Product type list
Table 1
Product Type WEN Pin Logic Constant Current Source Pull-down
for WEN Pin Input Edge Output Pull-up
Resistor
A Active "H" Available Rising edge Available
B Active "H" Available Falling edge Available
D Active "L" Unavailable Rising edge Available
E Active "L" Unavailable Falling edge Available
G Active "H" Available Rising edge Unavailable
H Active "H" Available Falling edge Unavailable
J Active "L" Unavailable Rising edge Unavailable
K Active "L" Unavailable Falling edge Unavailable
3. Packages
Table 2 Package Drawing Codes
Package Name Dimension Tape Reel Land
TMSOP-8 FM008-A-P-SD FM008-A-C-SD FM008-A-R-SD −
HSNT-8(2030) PP008-A-P-SD PP008-A-C-SD PP008-A-R-SD PP008-A-L-SD
AUTOMOTIVE, 125°C OPERATION, 3.8
μ
A
CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
Rev.1.2_00 S-19405 Series
5
Pin Configurations
1. TMSOP-8
7
6
5
8
2
3
4
1
Top view
Figure 5
Table 3
Pin No. Symbol Description
1 RST
_
_____
_
Reset output pin
2 CPOR Reset time-out period adjustment pin
3 CWDT Watchdog time adjustment pin
4 VSS GND pin
5 WEN Watchdog enable pin
6 WDO
_
______
_
Watchdog output pin
7 WDI Watchdog input pin
8 VDD Voltage input pin
2. HSNT-8(2030)
81
54
Top view
Bottom view
18
45
*1
Figure 6
Table 4
Pin No. Symbol Description
1 RST
_
_____
_
Reset output pin
2 CPOR Reset time-out period adjustment pin
3 CWDT Watchdog time adjustment pin
4 VSS GND pin
5 WEN Watchdog enable pin
6 WDO
_
______
_
Watchdog output pin
7 WDI Watchdog input pin
8 VDD Voltage input pin
*1. Connect the heat sink of backside at shadowed area to the board, and set electric potential GND.
However, do not use it as the function of electrode.
AUTOMOTIVE, 125°C OPERATION, 3.8
μ
A CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
S-19405 Series Rev.1.2_00
6
Pin Functions
Refer to " Operations" for details.
1. RST
________
pin
This is a reset output pin. It outputs "L" when detecting a low voltage.
Be sure to connect an external pull-up resistor (RextR) to the RST
_______
pin in the product without an output pull-up
resistor.
3. WDO
_________
pin
This is the watchdog output (time-out detection) pin.
Be sure to connect an external pull-up resistor (RextW) to the WDO
________
pin in the product without an output pull-up
resistor. Table 5 shows the WDO
________
pin and RST
_______
pin output statuses.
Table 5
Operation Status WDO
_
______
_
Pin RST
_
_____
_
Pin
Normal operation "H" "H"
Low voltage detection "L" "L"
Time-out detection "L" "H"
When watchdog timer is Disable "H" "H"
3. CPOR pin
This is a pin to connect an adjustment capacitor for reset output delay time (CPOR) in order to generate the reset
time-out period (tRST). CPOR is charged and discharged by an internal constant current circuit, and the
charge-discharge duration is tRST.
tRST is calculated by using the following equation. Take into consideration CPOR variation.
tRST = 6,500,000 × CPOR [F] + 0.0002
4. CWDT pin
This is a pin to connect an adjustment capacitor for watchdog output delay time (CWDT) in order to generate the
watchdog time-out period (tWDU). CWDT is charged and discharged by an internal constant current circuit.
tWDU is calculated by using the following equation. Take into consideration CWDT variation.
tWDU = 50,000,000 × CWDT [F] + 0.0011
5. WEN pin
This is a pin to switch Enable / Disable of the watchdog timer.
The voltage detection circuit independently operates at all times regardless of the watchdog timer operation.
5. 1 S-19405 Series A / B / G / H type (WEN pin logic active "H" product)
The watchdog timer becomes Enable if the input is "H", and the charge-discharge operation is performed at the
CWDT pin.
The WEN pin is connected to a constant current source (0.3 μA typ.) and is pulled down internally.
5. 2 S-19405 Series D / E / J / K type (WEN pin logic active "L" product)
The watchdog timer becomes Enable if the input is "L", and the charge-discharge operation is performed at the
CWDT pin.
The WEN pin is not pulled down internally.
6. WDI pin
This is an input pin to receive a signal from the monitored object. By inputting an edge at an appropriate timing, the
WDI pin confirms the normal operation of the monitored object.
The WDI pin is connected to a constant current source (0.3 μA typ.) and is pulled down internally.
AUTOMOTIVE, 125°C OPERATION, 3.8
μ
A
CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
Rev.1.2_00 S-19405 Series
7
Absolute Maximum Ratings
Table 6
(Ta = −40°C to +125°C unless otherwise specified)
Item Symbol Absolute Maximum Rating Unit
VDD pin voltage VDD VSS − 0.3 to VSS + 7.0 V
WDI pin voltage VWDI VSS − 0.3 to VDD + 0.3 ≤ VSS + 7.0 V
WEN pin voltage VWEN VSS − 0.3 to VDD + 0.3 ≤ VSS + 7.0 V
CPOR pin voltage VCPOR VSS − 0.3 to VDD + 0.3 ≤ VSS + 7.0 V
CWDT pin voltage VCWDT VSS − 0.3 to VDD + 0.3 ≤ VSS + 7.0 V
RST
_______
pin voltage A / B / D / E type VRST
_______ VSS − 0.3 to VDD + 0.3 ≤ VSS + 7.0 V
G / H / J / K type VSS − 0.3 to VSS + 7.0 V
WDO
________
pin voltage A / B / D / E type VWDO
________ VSS − 0.3 to VDD + 0.3 ≤ VSS + 7.0 V
G / H / J / K type VSS − 0.3 to VSS + 7.0 V
Operation ambient temperature Topr −40 to +125 °C
Storage temperature Tstg −40 to +150 °C
Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical
damage. These values must therefore not be exceeded under any conditions.
Thermal Resistance Value
Table 7
Item Symbol Condition Min. Typ. Max. Unit
Junction-to-ambient thermal
resistance*1 θJA
TMSOP-8
Board A − 160 − °C/W
Board B − 133 − °C/W
Board C −
− − °C/W
Board D −
− − °C/W
Board E −
− − °C/W
HSNT-8(2030)
Board A − 181 − °C/W
Board B − 135 − °C/W
Board C −
40 − °C/W
Board D −
42 − °C/W
Board E −
32 − °C/W
*1. Test environment: compliance with JEDEC STANDARD JESD51-2A
Remark Refer to " Power Dissipation" and "Test Board" for details.
Recommended Operation Conditions
Table 8
Item Symbol Condition Min. Typ. Max. Unit
VDD pin voltage VDD Detector block 0.9 − 6.0 V
Watchdog timer block 2.5 − 6.0 V
Set detection voltage −VDET
(
S
)
0.1 V step 2.0 − 5.0 V
External pull-up resistor
for RST
_______
pin RextR S-19405 Series G / H / J / K type 10 100 − kΩ
External pull-up resistor
for WDO
________
pin RextW S-19405 Series G / H / J / K type 10 100 − kΩ
Adjustment capacitor
for reset output delay time CPOR − 0.1 2.2 1000 nF
Adjustment capacitor
for watchdog output delay time CWDT − 0.1 0.47 1000 nF
AUTOMOTIVE, 125°C OPERATION, 3.8
μ
A CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
S-19405 Series Rev.1.2_00
8
Electrical Characteristics
Table 9 (1 / 2)
(WEN pin logic active "H" product, VDD = 5.0 V, Ta = −40°C to +125°C unless otherwise specified)
Item Symbol Condition Min. Typ. Max. Unit Test
Circuit
Detection voltage*1 −VDET − −VDET(S)
× 0.98 −VDET(S) −VDET(S)
× 1.02 V 1
Hysteresis width VHYS − −VDET
× 0.03
−VDET
× 0.05
−VDET
× 0.07 V 1
Current consumption
during operation ISS1 When watchdog timer operates − 3.8 9.0 μA 2
Reset time-out period tRST CPOR = 2200 pF 8.7 14.5 20 ms 3
Watchdog time-out period tWDU CWDT = 470 pF 15 24.6 34 ms 3
Reset output voltage "H" VROH A / B / D / E type only VDD − 1.0 − − V 4
Reset output voltage "L" VROL
External pull-up resistor of 100 k
Ω
is connected for G / H / J / K type
− − 0.4 V 5
Reset output pull-up current IRUP VRST
_______
= 0 V,
A / B / D / E type only − −0.85 −0.4 μA 6
Reset output current IROUT V
DS = 0.4 V
VDD = 1.5 V 0.48 1.1 − mA
7
VDD = 1.8 V 0.8 1.6 − mA
7
VDD = 2.5 V 1.0 2.6 − mA
7
VDD = 3.0 V 1.4 3.3 − mA
7
Reset output leakage current IRLEAK V
DS = 6.0 V, VDD = 6.0 V − − 0.096 μA 8
Watchdog output voltage "H" VWOH A / B / D / E type only VDD − 1.0 − − V
9
Watchdog output voltage "L" VWOL
External pull-up resistor of 100 k
Ω
is connected for G / H / J / K type
− − 0.4 V 10
Watchdog output
pull-up current IWUP VWDO
________
= 0 V,
A / B / D / E type only − −0.85 −0.4 μA 11
Watchdog output current IWOUT V
DS = 0.4 V
VDD = 1.5 V 0.48 1.1 − mA
12
VDD = 1.8 V 0.8 1.6 − mA
12
VDD = 2.5 V 1.0 2.6 − mA
12
VDD = 3.0 V 1.4 3.3 − mA
12
Watchdog output leakage
current IWLEAK V
DS = 6.0 V, VDD = 6.0 V − − 0.096 μA 13
Input pin voltage 1 "H" VSH1 WEN pin 0.7 × VDD − − V 14
Input pin voltage 1 "L" VSL1 WEN pin − − 0.3 × VDD V 14
Input pin voltage 2 "H" VSH2 WDI pin 0.7 × VDD − − V 14
Input pin voltage 2 "L" VSL2 WDI pin − − 0.3 × VDD V 14
AUTOMOTIVE, 125°C OPERATION, 3.8
μ
A
CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
Rev.1.2_00 S-19405 Series
9
Table 9 (2 / 2)
(WEN pin logic active "H" product, VDD = 5.0 V, Ta = −40°C to +125°C unless otherwise specified)
Item Symbol Condition Min. Typ. Max. Unit Test
Circuit
Input pin current 1 "H" ISH1
WEN pin,
VDD = 6.0 V,
Input pin voltage = 6.0 V
A / B / G / H
type − 0.3 1.0 μA 14
D / E / J / K
type −0.1 − 0.1 μA 14
Input pin current 1 "L" ISL1 WEN pin, VDD = 6.0 V,
Input pin voltage = 0 V −0.1 − 0.1 μA 14
Input pin current 2 "H" ISH2 WDI pin, VDD = 6.0 V,
Input pin voltage = 6.0 V − 0.3 1.0 μA 14
Input pin current 2 "L" ISL2 WDI pin, VDD = 6.0 V,
Input pin voltage = 0 V −0.1 − 0.1 μA 14
Input pulse width "H"*2 thigh1 − 1.5 − − μs 14
Input pulse width "L"*2 tlow1 − 1.5 − − μs 14
Watchdog output delay time tWOUT − − 25 40 μs 3
Reset output delay time tROUT − − 25 40 μs 3
Input setup time tiset − 1.0 − − μs 3
*1. −VDET: Actual detection voltage, −VDET(S): Set detection voltage
*2. The input pulse width "H" (thigh1) and the input pulse width "L" (tlow1) are defined as shown in Figure 7.
Inputs to the WEN pin and the WDI pin should be greater than or equal to the min. value specified in " Electrical
Characteristics".
t
high1
t
low1
V
SH2
V
SH2
V
SL2
V
SL2
WEN
WDI
t
high1
t
low1
V
SH1
V
SH1
V
SL1
V
SL1
Figure 7
AUTOMOTIVE, 125°C OPERATION, 3.8
μ
A CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
S-19405 Series Rev.1.2_00
10
Test Circuits
Refer to " Recommended Operation Conditions" when setting constants of external pull-up resistors (RextR, RextW)
and external capacitors (CPOR, CWDT).
(1) S-19405 Series A / B / D / E type (2) S-19405 Series G / H / J / K type
VDD
VSS
V
+
+
CPOR
CWDT
WDI
WEN
WDO
V
RST
VDD
VSS
V
+
+
CPOR
CWDT
WDI
WEN
WDO
V
RST
Figure 8 Test Circuit 1
VSS
A
CPOR
CWDT
WDI
WEN
WDO
VDD
+
RST
Figure 9 Test Circuit 2
(1) S-19405 Series A / B / D / E type (2) S-19405 Series G / H / J / K type
VSS
V
+
CPOR
CWDT
WDI
WEN
WDO
VDD
RST
VSS
V
+
CPOR
CWDT
WDI
WEN
WDO
VDD
RST
Figure 10 Test Circuit 3
VDD
VSS V+
CPOR
CWDT
WDI
WEN
WDO
RST
Figure 11 Test Circuit 4
AUTOMOTIVE, 125°C OPERATION, 3.8
μ
A
CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
Rev.1.2_00 S-19405 Series
11
(1) S-19405 Series A / B / D / E type (2) S-19405 Series G / H / J / K type
VDD
VSS V+
CPOR
CWDT
WDI
WEN
WDO
RST
VDD
VSS V+
CPOR
CWDT
WDI
WEN
WDO
RST
Figure 12 Test Circuit 5
VDD
VSS A
CPOR
CWDT
WDI
WEN
WDO
RST
+
VDD
VSS
A
CPOR
CWDT
WDI
WEN
WDO
RST +
Figure 13 Test Circuit 6 Figure 14 Test Circuit 7
VDD
VSS
A
CPOR
CWDT
WDI
WEN
WDO
RST +
VDD
VSS
V
CPOR
CWDT
WDI
WEN
WDO
+
RST
Figure 15 Test Circuit 8 Figure 16 Test Circuit 9
(1) S-19405 Series A / B / D / E type (2) S-19405 Series G / H / J / K type
VDD
VSS
V
+
CPOR
CWDT
WDI
WEN
WDO
RST
VDD
VSS
V
+
CPOR
CWDT
WDI
WEN
WDO
RST
Figure 17 Test Circuit 10
AUTOMOTIVE, 125°C OPERATION, 3.8
μ
A CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
S-19405 Series Rev.1.2_00
12
VDD
VSS
A
CPOR
CWDT
WDI
WEN
WDO
+
RST
VDD
VSS
A
CPOR
CWDT
WDI
WEN
WDO +
RST
Figure 18 Test Circuit 11 Figure 19 Test Circuit 12
VDD
VSS
A
CPOR
CWDT
WDI
WEN
WDO +
RST
VDD
VSS
V
+
CPOR
CWDT
WEN, WDI
WDO
A
+RST
Figure 20 Test Circuit 13 Figure 21 Test Circuit 14
AUTOMOTIVE, 125°C OPERATION, 3.8
μ
A
CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
Rev.1.2_00 S-19405 Series
13
Operations
1. From power-on to reset release
The S-19405 Series initiates the initialization if the VDD pin voltage exceeds the release voltage (+VDET).
The charge-discharge operation to the CPOR pin is initiated after the passage of the initialization time (tINIT), and
the WDO
________
pin output and the RST
_______
pin output change from "L" to "H" after the operation is performed 4 times.
t
INIT
t
RST
+V
DET
V
CPU
V
CPL
Output "L" → "H"
Output "L" → "H"
VDD
CPOR
WDO
RST
Remark VCPU: CPOR charge upper limit threshold (1.25 V typ.)
V
CPL: CPOR charge lower limit threshold (0.20 V typ.)
Figure 22
tINIT changes according to the power supply rising time. Refer to Figure 23 for the relation between tINIT and the
power supply rising time.
Ta = +25°C
0.000001 0.00001 0.0001 0.001 0.01 0.1
Initialization time [s]
Power supply rising time [s]
0.1
0.01
0.001
0.0001
0.00001
−V
DET
= 2.0 V
−V
DET
= 5.0 V
−V
DET
= 3.3 V
Figure 23 Power Supply Rising Time Dependency of Initialization Time
V
DD = WEN
CPOR V
CPL
+V
DET
1.8 V
6.0 V
Initialization time
*1
Power supply rising time
*1. The initialization time is the time period from when the VDD pin voltage reaches +VDET to when CPOR rises.
Figure 24 Initialization Time
AUTOMOTIVE, 125°C OPERATION, 3.8
μ
A CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
S-19405 Series Rev.1.2_00
14
2. From reset release to initiation of charge-discharge operation to CWDT pin
The charge-discharge operation to the CWDT pin differs depending on the status of the WEN pin at the reset release.
2. 1 When WEN pin is "H" at reset release (Active "H")
Since the watchdog timer is Enable, the S-19405 Series initiates the charge-discharge operation to the CWDT pin.
VDD
CPOR
CWDT
WEN
WDO
RST
(Active "H")
Figure 25 WEN Pin = "H"
2. 2 When WEN pin is "L" at reset release (Active "H")
Since the watchdog timer is Disable after the CPOR pin performs the charge-discharge operation 4 times, the
S-19405 Series does not initiate the charge-discharge operation to the CWDT pin. If the input to the WEN pin
changes to "H" in this status, the S-19405 Series initiates the charge-discharge operation to the CWDT pin.
Charge-discharge operation is initiated
at WEN pin = "H"
VDD
CPOR
CWDT
WEN
WDO
RST
(Active "H")
Figure 26 WEN Pin = "L" → "H"
AUTOMOTIVE, 125°C OPERATION, 3.8
μ
A
CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
Rev.1.2_00 S-19405 Series
15
3. Watchdog time-out detection
The watchdog timer detects a time-out after the charge-discharge operation to the CWDT pin is performed 32 times,
then the WDO
________
pin output changes from "H" to "L".
"L"
12 34 12 34
12 312345 29303132
t
WDU
t
RST
VDD
CPOR
CWDT
WDI
WEN
WDO
RST
(Active "H")
Figure 27
4. Internal counter reset due to edge detection
When the WDI pin detects an edge during the charge-discharge operation to the CWDT pin, the internal counter
which counts the number of times of the charge-discharge operation is reset. The CWDT pin initiates the discharge
operation when an edge is detected, and initiates the charge-discharge operation again after the discharge operation
is completed.
4. 1 Counter reset due to rising edge detection
(S-19405AxxA, S-19405DxxA, S-19405GxxA, S-19405JxxA)
1234 1234
1 2 3 4 1 2 3 4 30 31 32 1
Counter reset due to rising edge detection Time-out after counter reset
VDD
CPOR
CWDT
WDI
WEN
WDO
RST
(Active "H")
Figure 28
AUTOMOTIVE, 125°C OPERATION, 3.8
μ
A CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
S-19405 Series Rev.1.2_00
16
4. 2 Counter reset due to falling edge detection
(S-19405BxxA, S-19405ExxA, S-19405HxxA, S-19405KxxA)
VDD
CPOR
CWDT
WDI
WEN
WDO
RST
(Active "H")
1234 1234
1 2 3 4 1 2 3 4 30 31 32 1
Counter reset due to falling edge detection Time-out after counter reset
Figure 29
5. WEN pin operation during charge-discharge operation to CWDT pin
When the WEN pin changes from "H" to "L" during the charge-discharge operation to the CWDT pin, the CWDT pin
performs the discharge operation. Moreover, the internal counter which counts the number of times of the
charge-discharge operation for the CWDT pin is also reset.
If the WEN pin changes to "H" again in this status, the CWDT pin initiates the charge-discharge operation.
VDD
CPOR
CWDT
WEN
WDO
RST
(Active "H")
Watchdog timer restarts the operation at WEN pin = "H"
Charge-discharge operation is stopped, counter reset
31 32
1234
1234 12
1234
12
Figure 30
AUTOMOTIVE, 125°C OPERATION, 3.8
μ
A
CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
Rev.1.2_00 S-19405 Series
17
6. Operation of low voltage detection
The voltage detection circuit detects a low voltage if the power supply voltage falls below the detection voltage, and
then "L" is output from the WDO
________
pin and the RST
_______
pin. The output is maintained until the charge-discharge
operation of the CPOR pin is performed 4 times.
The S-19405 Series can detect a low voltage even if either the CPOR pin or the WDT pin performs the
charge-discharge operation. In this case, the status of the WEN pin does not have an affect.
"H" or "L"
"H" or "L"
*1
VDD
CPOR
CWDT
WDI
WEN
WDO
RST
(Active "H")
12 1234 1234
1234 12
Figure 31
*1. When the WEN pin is Disable, the charge-discharge operation of CWDT pin is not performed.
7. WEN pin and WDI pin
Each of the WEN pin and the WDI pin has a noise filter.
If the power supply voltage is 5.0 V, noise with a minimum pulse width of 200 ns can be eliminated.
AUTOMOTIVE, 125°C OPERATION, 3.8
μ
A CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
S-19405 Series Rev.1.2_00
18
Standard Circuits
1. S-19405 Series A / B / D / E type
WDO
RST
VDD
V
DD
WEN
WDI
C
POR*1
C
WDT*2
VSS CPOR CWDT
*1. Adjustment capacitor for reset output delay time (CPOR) should be connected directly to the CPOR pin and
the VSS pin.
*2. Adjustment capacitor for watchdog output delay time (CWDT) should be connected directly to the CWDT pin
and the VSS pin. A capacitor of 100 pF to 1 μF can be used for CPOR and CWDT.
Figure 32
2. S-19405 Series G / H / J / K type
WDO
RST
VDD
V
DD
WEN
WDI
C
POR*3
C
WDT*4
VSS CPOR CWDT
R
extW*1
R
extR*2
*1. R
extW is an external pull-up resistor for the WDO
________
pin.
*2. R
extR is an external pull-up resistor for the RST
_______
pin.
*3. Adjustment capacitor for reset output delay time (CPOR) should be connected directly to the CPOR pin and
the VSS pin.
*4. Adjustment capacitor for watchdog output delay time (CWDT) should be connected directly to the CWDT pin
and the VSS pin. A capacitor of 100 pF to 1 μF can be used for CPOR and CWDT.
Figure 33
Caution The above connection diagrams and constants will not guarantee successful operation.
Perform thorough evaluation using the actual application to set the constants.
AUTOMOTIVE, 125°C OPERATION, 3.8
μ
A
CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
Rev.1.2_00 S-19405 Series
19
Precautions
• It will take time for the discharge operation to be performed if the capacitance of CPOR is extremely large at the low
voltage detection, so the discharge operation may not be completed by the time the power supply voltage exceeds
the detection voltage. In that case, since the charge-discharge operation of the CPOR pin is performed after the
discharge operation is completed, the delay time of the same time length as the discharge operation occurs in reset
time-out period (tRST).
• Select a capacitor which satisfies the following equation for CPOR and CWDT. If this condition is not satisfied, the
delay time of the same time length as the discharge operation occurs in tRST since the discharge operation of an
external capacitor connected to the CWDT pin is not completed by the time the CWDT pin initiates the next
charge-discharge operation.
CWDT / CPOR ≤ 600
• When the power supply voltage falls to 0.9 V or lower, set a time interval of 20 μs or longer by the time the power
supply is raised again. If the appropriate time length is not secured, the time-out period after raising the power
supply voltage may get delayed.
• When the time that the power supply voltage falls below the detection voltage is short, the S-19405 Series may not
detect a voltage. In that case, the time-out period after raising the power supply voltage may get delayed.
• Since input pins (the WEN pin and the WDI pin) in the S-19405 Series are CMOS configurations, make sure that an
intermediate potential is not input when the S-19405 Series operates.
• Since the WDO
________
pin and the RST
_______
pin are affected by external resistance and external capacitance, use the
S-19405 Series after performing thorough evaluation with the actual application.
• Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic
protection circuit.
• ABLIC Inc. claims no responsibility for any disputes arising out of or in connection with any infringement by
products including this IC of patents owned by a third party.
AUTOMOTIVE, 125°C OPERATION, 3.8
μ
A CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
S-19405 Series Rev.1.2_00
20
Characteristics (Typical Data)
1. Current consumption during operation (I
SS1
) vs. Input voltage (V
DD
)
WDT = OFF, −VDET(S) = 4.0 V, Ta = +25°C
024
0.0
31
5.0
56
3.0
2.0
1.0
I
SS1
[A]
V
DD
[V]
4.0
WDT = ON,
−
V
DET(S)
= 4.0 V, Ta =
+
25°C, WDI input
4.0 5.0 6.0
3.0
5.54.5 6.5
5.0
4.5
4.0
3.5
I
SS1
[A]
V
DD
[V]
Ta =
+
25
C
Ta =
+
125
C
Ta =
40
C
2. Current consumption during operation (I
SS1
) vs. Temperature (Ta)
3. Detection voltage (
−
V
DET
)
,
Release voltage
(
+
V
DET
)
vs. Temperature (Ta)
WDT = ON,
−
V
DET(S)
= 4.0 V, V
DD
= 5.0 V, WDI input
25 0 25 50 75 100 12540
0.0
5.0
Ta [C]
4.0
3.0
2.0
1.0
I
SS1
[A]
−VDET(S) = 4.0 V
25 0 25 50 75 100 12540
3.5
3.0
Ta [C]
4.5
4.0
V
DET
, +V
DET
[V]
+V
DET
V
DET
4. Reset time-out period (t
RST
) vs. Temperature (Ta)
5. Watchdog time-out period (t
WDU
) vs. Temperature (Ta)
VDD = 5.0 V, CPOR = 2200 pF
25 0 25 50 75 100 12540
0
Ta [C]
40
30
20
10
t
RST
[ms]
VDD = 5.0 V, CWDT = 470 pF
25 0 25 50 75 100 12540
0
Ta [C]
40
30
20
10
t
WDU
[ms]
6. Reset output delay time (t
ROUT
) vs. Temperature (Ta) 7. Watchdog output delay time (t
WOUT
)
vs.
Temperature (Ta)
VDD = −VDET(S) + 1.0 V → −VDET(S) − 1.0 V,
CPOR = 2200 pF
25 0 25 50 75 100 12540
0
Ta [C]
40
30
20
10
t
ROUT
[s]
VDD = 5.0 V, CWDT = 470 pF
25 0 25 50 75 100 12540
0
Ta [C]
40
30
20
10
t
WOUT
[s]
AUTOMOTIVE, 125°C OPERATION, 3.8
μ
A
CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
Rev.1.2_00 S-19405 Series
21
8. Reset time-out period (tRST) vs. CPOR 9. Watchdog time-out period (tWDU) vs. CWDT
VDD = 5.0 V, Ta = +25°C
0.0001
t
RST
[s]
0.0001
C
POR
[F]
10
0.01
0.1
10.001 0.10.01
0.001
1
VDD = 5.0 V, Ta = +25°C
0.0001
t
WDU
[s]
0.001
C
WDT
[F]
100
0.1
1
10.001 0.10.01
0.01
10
10. Nch driver output current (I
WOUT
) vs. Input voltage (V
DD
)
VDS = 0.4 V, −VDET(S) = 4.0 V
024
2.0
315
6.0
4.0
I
WOUT
[mA]
V
DD
[V]
Ta =
+
125
C
Ta =
+
25
C
Ta =
40
C
0.0
AUTOMOTIVE, 125°C OPERATION, 3.8
μ
A CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
S-19405 Series Rev.1.2_00
22
Power Dissipation
0 25 50 75 100 125 150 175
0.0
0.2
0.4
0.6
0.8
1.0
Ambient temperature (Ta) [°C]
Power dissipation (P
D
) [W]
T
j
= +125°C max.
TMSOP-8
B
A
0 25 50 75 100 125 150 175
0
1
2
3
4
5
Ambient temperature (Ta) [°C]
Power dissipation (P
D
) [W]
T
j
= +125°C max.
HSNT-8(2030)
B
E
D
C
A
Board Power Dissipation (PD) Board Power Dissipation (PD)
A 0.63 W A 0.55 W
B 0.75 W B 0.74 W
C − C 2.50 W
D − D 2.38 W
E − E 3.13 W
(1)
1
2
3
4
(2)
1
2
3
4
Board B
Item Specification
Thermal via -
Material FR-4
Number of copper foil layer 4
Copper foil layer [mm]
Land pattern and wiring for testing: t0.070
74.2 x 74.2 x t0.035
74.2 x 74.2 x t0.035
74.2 x 74.2 x t0.070
Size [mm] 114.3 x 76.2 x t1.6
2
Copper foil layer [mm]
Land pattern and wiring for testing: t0.070
-
-
74.2 x 74.2 x t0.070
Thermal via -
Material FR-4
Board A
Item Specification
Size [mm] 114.3 x 76.2 x t1.6
Number of copper foil layer
ICMountArea
TMSOP-8 Test Board
No. TMSOP8-A-Board-SD-1.0
ABLIC Inc.
(1)
1
2
3
4
(2)
1
2
3
4
(3)
1
2
3
4
Thermal via Number: 4
Diameter: 0.3 mm
Number of copper foil layer 4
Copper foil layer [mm]
Land pattern and wiring for testing: t0.070
74.2 x 74.2 x t0.035
74.2 x 74.2 x t0.035
74.2 x 74.2 x t0.070
Board C
Item Specification
Size [mm] 114.3 x 76.2 x t1.6
Material FR-4
Board B
Item Specification
Thermal via -
Material FR-4
Number of copper foil layer 4
Copper foil layer [mm]
Land pattern and wiring for testing: t0.070
74.2 x 74.2 x t0.035
74.2 x 74.2 x t0.035
74.2 x 74.2 x t0.070
Size [mm] 114.3 x 76.2 x t1.6
2
Copper foil layer [mm]
Land pattern and wiring for testing: t0.070
-
-
74.2 x 74.2 x t0.070
Thermal via -
Material FR-4
Board A
Item Specification
Size [mm] 114.3 x 76.2 x t1.6
Number of copper foil layer
ICMountArea
HSNT-8(2030) Test Board
No. HSNT8-A-Board-SD-2.0
enlargedview
ABLIC Inc.
(4)
1
2
3
4
(5)
1
2
3
4
Thermal via Number: 4
Diameter: 0.3 mm
Number of copper foil layer 4
Pattern for heat radiation: 2000mm
2
t0.070
74.2 x 74.2 x t0.035
74.2 x 74.2 x t0.035
74.2 x 74.2 x t0.070
74.2 x 74.2 x t0.070
Thermal via -
Size [mm] 114.3 x 76.2 x t1.6
Material FR-4
Board D
Item Specification
Size [mm] 114.3 x 76.2 x t1.6
Material FR-4
Number of copper foil layer
Copper foil layer [mm]
Board E
Item Specification
4
Copper foil layer [mm]
Pattern for heat radiation: 2000mm
2
t0.070
74.2 x 74.2 x t0.035
74.2 x 74.2 x t0.035
ICMountArea
HSNT-8(2030) Test Board
No. HSNT8-A-Board-SD-2.0
enlargedview
enlargedview
ABLIC Inc.
No.
TITLE
UNIT
ANGLE
ABLIC Inc.
2.90±0.2
85
0.2±0.1
0.65±0.1
0.13±0.1
14
TMSOP8-A-PKG Dimensions
No. FM008-A-P-SD-1.2
FM008-A-P-SD-1.2
mm
No.
TITLE
UNIT
ANGLE
ABLIC Inc.
0.30±0.05
1.00±0.1
1.05±0.05
1.5
2.00±0.05
4.00±0.1
3.25±0.05
4.00±0.1
1
4
58
TMSOP8-A-Carrier Tape
Feed direction
No. FM008-A-C-SD-2.0
FM008-A-C-SD-2.0
+0.1
-0
mm
No.
TITLE
UNIT
ANGLE
ABLIC Inc.
16.5max.
13.0±0.3
QTY. 4,000
(60°)
(60°)
13±0.2
Enlarged drawing in the central part
TMSOP8-A-Reel
No. FM008-A-R-SD-1.0
FM008-A-R-SD-1.0
mm
No.
TITLE
UNIT
ANGLE
ABLIC Inc.
2.0±0.1
No. PP008-A-P-SD-2.0
0.5
0.23±0.1
(1.70)
mm
PP008-A-P-SD-2.0
The heat sink of back side has different electric
potential depending on the product.
Confirm specifications of each product.
Do not use it as the function of electrode.
0.08 +0.05
-0.02
HSNT-8-A-PKG Dimensions
14
5
8
No.
TITLE
UNIT
ANGLE
ABLIC Inc.
mm
No. PP008-A-C-SD-1.0
PP008-A-C-SD-1.0
HSNT-8-A-Carrier Tape
0.60±0.05
0.25±0.05
Feed direction
2.0±0.05
4.0±0.1
ø1.5
ø1.0
134
5
2
6
2.3±0.05
4.0±0.1
78
+0.1
-0
+0.1
-0
No.
TITLE
UNIT
ANGLE
ABLIC Inc.
mm
QTY.
No. PP008-A-R-SD-1.0
PP008-A-R-SD-1.0
HSNT-8-A-Reel
5,000
11.4±1.0
9.0
ø13±0.2
(60°) (60°)
Enlarged drawing in the central part
+1.0
- 0.0
No.
TITLE
UNIT
ANGLE
ABLIC Inc.
mm
PP008-A-L-SD-1.0
0.50
0.30
1.6
No. PP008-A-L-SD-1.0
HSNT-8-A
-Land Recommendation
Disclaimers (Handling Precautions)
1. All the information described herein
(product data,
specifications,
figures,
tables,
programs,
algorithms and application
circuit examples,
etc.)
is current as of publishing date of this document and is subject to change without notice.
2. The circuit examples and the usages described herein are for reference only, and do not guarantee the success of
any specific mass-production design.
ABLIC Inc. is not responsible for damages caused by the reasons other than the products described herein
(hereinafter "the products") or infringement of third-party intellectual property right and any other right due to the use
of the information described herein.
3. ABLIC Inc. is not responsible for damages caused by the incorrect information described herein.
4. Be careful to use the products within their specified ranges. Pay special attention to the absolute maximum ratings,
operation voltage range and electrical characteristics, etc.
ABLIC Inc. is not responsible for damages caused by failures and / or accidents, etc. that occur due to the use of the
products outside their specified ranges.
5. When using the products, confirm their applications, and the laws and regulations of the region or country where they
are used and verify suitability, safety and other factors for the intended use.
6. When exporting the products, comply with the Foreign Exchange and Foreign Trade Act and all other export-related
laws, and follow the required procedures.
7. The products must not be used or provided (exported) for the purposes of the development of weapons of mass
destruction or military use. ABLIC Inc. is not responsible for any provision (export) to those whose purpose is to
develop, manufacture, use or store nuclear, biological or chemical weapons, missiles, or other military use.
8. The products are not designed to be used as part of any device or equipment that may affect the human body, human
life, or assets (such as medical equipment, disaster prevention systems, security systems, combustion control
systems, infrastructure control systems, vehicle equipment, traffic systems, in-vehicle equipment, aviation equipment,
aerospace equipment, and nuclear-related equipment), excluding when specified for in-vehicle use or other uses. Do
not apply the products to the above listed devices and equipments without prior written permission by ABLIC Inc.
Especially, the products cannot be used for life support devices, devices implanted in the human body and devices
that directly affect human life, etc.
Prior consultation with our sales office is required when considering the above uses.
ABLIC Inc. is not responsible for damages caused by unauthorized or unspecified use of our products.
9. Semiconductor products may fail or malfunction with some probability.
The user of the products should therefore take responsibility to give thorough consideration to safety design including
redundancy, fire spread prevention measures, and malfunction prevention to prevent accidents causing injury or
death, fires and social damage, etc. that may ensue from the products' failure or malfunction.
The entire system must be sufficiently evaluated and applied on customer's own responsibility.
10. The products are not designed to be radiation-proof. The necessary radiation measures should be taken in the
product design by the customer depending on the intended use.
11. The products do not affect human health under normal use. However, they contain chemical substances and heavy
metals and should therefore not be put in the mouth. The fracture surfaces of wafers and chips may be sharp. Be
careful when handling these with the bare hands to prevent injuries, etc.
12. When disposing of the products, comply with the laws and ordinances of the country or region where they are used.
13. The information described herein contains copyright information and know-how of ABLIC Inc.
The information described herein does not convey any license under any intellectual property rights or any other
rights belonging to ABLIC Inc. or a third party. Reproduction or copying of the information from this document or any
part of this document described herein for the purpose of disclosing it to a third-party without the express permission
of ABLIC Inc. is strictly prohibited.
14. For more details on the information described herein, contact our sales office.
2.2-2018.06
www.ablic.com
