THIS SPEC IS OBSOLETE
Spec No: 002-08550
Spec Title: MB3793-27A Power Voltage Monitoring IC with
Watchdog Timer
Replaced by: None
Cypress Semiconductor Corporation • 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600
Document Number: 002-08550 Rev. *D Revised December 10, 2018
MB3793-27A
Power Voltage Monitoring IC with
Watchdog Timer
Description
The MB3793 is an integrated circuit to monitor power voltage; it incorporates a watchdog timer. A reset signal is output when the
power is cut or falls abruptly. When the power recovers normally after resetting, a power-on reset signal is output to microprocessor
units (MPUs). An internal watchdog timer with two inputs for system operation diagnosis can provide a fall-safe function for various
application systems.
Features
Precise detection of power voltage fall: ±2.5%
Detection voltage with hysteresis
Low power dispersion: ICC = 31 μA (reference)
Internal dual-input watchdog timer
Watchdog-timer halt function (by inhibition pin)
Independently-set watchdog and reset times
Three types of packages (SOP-8pin : 2 types)
Application
Arcade Amusement etc.
Document Number: 002-08550 Rev. *D Page 2 of 25
MB3793-27A
Contents
Description .............................................................................1
Features ..................................................................................1
Application .............................................................................1
Contents ................................................................................. 2
1. Pin Assignment .................................................................3
2. Pin Description .................................................................. 3
3. Block Diagram ...................................................................4
4. Block Description .............................................................. 5
5. Absolute Maximum Ratings .............................................5
6. Recommended Operating Co nd iti ons ............... ..............6
7. Electrical Characteristics .................................................. 7
7.1 DC Characteristics ..................................................... 7
7.2 AC Characteristics ...................................................... 7
8. Diagram .............................................................................. 8
8.1 Basic operation (Positive clock pulse) ........................ 8
8.2 Basic operation (Negative clock pulse) ...................... 9
8.3 Single-clock input monitoring (Positive clock pulse) . 10
8.4 Inhibition operation (Positive clock pulse) ................ 11
8.5 Clock pulse input supplementation
(Positive clock pulse) ............................................................. 12
9. Operation Sequence ........................................................ 13
9.1 Positive clock pulse input ......................................... 13
9.2 Negative clock pulse input ........................................ 13
9.3 Clock monitoring ....................................................... 13
9.4 Description of Operations ......................................... 13
10. Typical Characteristics ................................................. 15
11. Application Example ...... ... ... ................. .. ................. ... ..18
11.1 Supply voltage monitor and watchdog timer (1-clock
monitor) ................................................................................. 18
11.2 Supply voltage monitor and watchdog timer stop ... 19
12. Typical Application ......... ... ................. ... ................ ... ..... 20
13. Notes On Use ................................................................. 21
14. Ordering Information .............. ... ................. ... ................21
15. RoHS Compliance Informati on..... ... ................. ... .......... 21
16. Package Dimensions ..................................................... 22
17. Major Changes ...................... .. ................. ... ................. .. 24
Document History ........................ ................. ................. ..... 24
Sales, Solutions, and Legal Information ........................... 25
Document Number: 002-08550 Rev. *D Page 3 of 25
MB3793-27A
1. Pin Assignment
2. Pin Description
Pin no. Symbol Descriptions Pin no. Symbol Descriptions
1RESET Outputs reset pin 5VCC Power supply pin
2CTW Watchdog timer monitor time setting pin 6 INH Inhibit pin
3CTP Power-on reset hold time setting pin 7CK2 Inputs clock 2 pin
4GND Ground pin 8CK1 Inputs clock 1 pin
(SOE008)
CTW
CTP
GND VCC
INH
CK2
CK1
(TOP VIEW)
1
2
3
4
8
7
6
5
(SOB008)
RESET
Document Number: 002-08550 Rev. *D Page 4 of 25
MB3793-27A
3. Block Diagram
I1 = 3 μA
..I2 = 30 μA
..
R1 =
295 kΩ
..
3
1
6
2
8
7
5
4
CTP
To VCC of all blocks
Pulse generator 1
Watchdog
timer
Reference
voltage
generator
To GND of
all blocks
Pulse generator 2
Output circuit
Logic circuit
RESET
INH
CTW
CK1
CK2
VCC
GND
Comp.S
−
+
VS
VREF = 1.24 V
..
R2 =
240 kΩ
..
Document Number: 002-08550 Rev. *D Page 5 of 25
MB3793-27A
4. Block Description
1. Comp. S
Comp. S is a comparator with hysteresis to compare the reference voltage with a voltage (VS) that is the result of dividing the power
voltage (VCC) by resistors 1 and 2. When VS falls below 1.24 V, a reset signal is output.
This function enables the MB3793 to detect an abnormality within 1 μs when the power is cut or falls abruptly.
2. Output circuit
The output circuit contains a RESET output control comparator that compares the voltage at the CTP pin to the threshold voltage to
release the RESET output if the CTP pin voltage exceeds the threshold value.
Since the reset (RESET) output buffer has CMOS organization, no pull-up resistor is needed.
3. Pulse generator
The pulse generator generates pulses when the voltage at the CK1 and CK2 clock pins changes to High from Low level
(positive-edge trigger) and exceeds the threshold voltage; it sends the clock signal to the watchdog timer.
4. Watchdog timer
The watchdog timer can monitor two clock pulses. Short-circuit the CK1 and CK2 clock pins to monitor a single clock pulse.
5. Inhibition pin
The inhibition (INH) pin forces the watchdog timer on/off. When this pin is High level, the watchdog timer is stopped.
6. Logic circuit
The logic circuit contains flip-flops.
Flip-flop RSFF1 controls the charging and discharging of the power-on reset hold time setting capacitor (CTP).
Flip-flop RSFF2 turns on/off the circuit that accelerates charging of the power-on reset hold time setting capacitor
(CTP) at a reset. The RSFF2 operates only at a reset; it does not operate at a power-on reset when the power is turned on.
5. Absolute Maximum Ratings
*: The voltage is based on the ground voltage (0 V).
WARNING:
1. Semiconductor devices may be permanently damaged by application of stress (including, without limitation,
voltage, current or temperature) in excess of absolute maximum ratings.Do not exceed any of these ratings.
Parameter Symbol Conditions Rating Unit
Min Max
Power supply voltage* VCC —–0.3 +7 V
Input voltage*
CK1 VCK1 —
–0.3 +7 VCK2 VCK2 —
INH IINH —
Reset output current RESET IOL
IOH —–10 +10 mA
Power dissipation PDTa ≤ +85°C—200 mW
Storage temperature Tstg —–55 +125 °C
Document Number: 002-08550 Rev. *D Page 6 of 25
MB3793-27A
6. Recommended Operating Conditions
*: The watchdog timer monitor time range depends on the rating of the setting capacitor.
WARNING:
1.The recommended operating conditions are required in order to ensure the normal operation of the
semiconductor device. All of the device's electrical characteristics are warranted when the device is operated
under these conditions.
2.Any use of semiconductor devices will be under their recommended operating condition.
3.Operation under any conditions other than these conditions may adversely affect reliability of device and could
result in device failure.
4.No warranty is made with respect to any use, operating conditions or combinatio ns not represented on this data
sheet. If you are considering application under any conditions other than listed herein, please contact sales
representatives beforehand.
Parameter Symbol Conditions Value Unit
Min Typ Max
Power supply voltage VCC — 1.2 — 6.0 V
Reset (RESET) output current IOL
IOH —–5 —+5 mA
Power-on reset hold time setting capacity CTP —0.001 —10 μF
Watchdog-timer monitoring time setting
capacity*CTW —0.001 — 1 μF
Operating ambient temperature Ta —–40 —+85 °C
Document Number: 002-08550 Rev. *D Page 7 of 25
MB3793-27A
7. Electrical Characteristics
7.1 DC Characteristics (VCC = +3.3 V, Ta = +25°C)
*: The values enclosed in parentheses ( ) are setting assurance values.
7.2 AC Characteristics
(VCC = +3.3 V, Ta = +25°C)
*1:The voltage range is 10% to 90% at testing the reset output transition time.
*2:The values enclosed in parentheses ( ) are setting assurance values.
Parameter Symbol Conditions Value Unit
Min Typ Max
Power supply current ICC After exit from reset — 31 55 μA
Detection voltage
VSL VCC falling Ta = +25 °C 2.63 2.70 2.77
V
Ta = –40 °C to +85 °C (2.59)* 2.70 (2.81)*
VSH VCC rising Ta = +25 °C 2.69 2.76 2.87
V
Ta = –40 °C to +85 °C (2.65)* 2.76 (2.87)*
Detection voltage hysteresis
difference VSHYS VSH – VSL 35 65 95 mV
Clock-input threshold voltage
VCIH CK rising (0.7)* 1.3 1.9 V
VCIL CK falling 0.51.0(1.5)* V
Clock-input hysteresis VCHTS —(0.1)* 0.3(0.6)* V
Inhibition-input voltage
VIIH — 2.2 — —
V
VIIL — — 0 0.8
Input current
(CK1, CK2, INH)
IIH VCK = 5 V — 0 1.0 μA
IIL VCK = 0 V –1.0 0 — μA
Reset output voltage
VOH IRESET = –5 mA 2.8 3.10 — V
VOL IRESET = +5 mA —0.12 0.4 V
Reset-output minimum power voltage VCCL IRESET = +50 μA— 0.8 1.2 V
Parameter Symbol Conditions Value Unit
Min Typ Max
Power-on reset hold time tPR CTP = 0.1 μF30 75 120 ms
VCC input pulse width tPI CTP = 0.1 μF(8)*2— — μs
VCC delay time tPD CTP = 0.1 μF— 2 (10)*2μs
Watchdog timer monitor time tWD
CTW = 0.01 μF,
CTP = 0.1 μF8 16 24 ms
Watchdog timer reset time tWR CTP = 0.1 μF25.5 9ms
Clock input pulse width tCKW —500 — — ns
Clock input pulse cycle tCKT— 20 — — μs
Reset (RESET) output transition time
Rising tr*1CL = 50 pF — — 500 ns
Falling tf*1CL = 50 pF — — 500 ns
Document Number: 002-08550 Rev. *D Page 8 of 25
MB3793-27A
8. Diagram
8.1 Basic operation (Positive clock pulse)
CTP
RESET
INH
CTW
CK1
CK2
VSH
VCC
VSL
Vth
VH
VL
(1) (2) (3) (4)(5) (5) (6) (7) (8) (9) (10) (11) (12) (13)
tPR tWD tPR
tWR
tCKW
tCKT
Document Number: 002-08550 Rev. *D Page 9 of 25
MB3793-27A
8.2 Basic operation (Negative clock pulse)
CTP
RESET
INH
CTW
CK1
CK2
VSH
VCC
VSL
Vth
VH
VL
tPR tWD tPR
tWR
tCKW
tCKT
(1) (2) (3) (4)(5) (5) (6) (7) (8) (9) (10) (11) (12) (13)
Document Number: 002-08550 Rev. *D Page 10 of 25
MB3793-27A
8.3 Single-clock input monitoring (Positive clock pulse)
CTP
RESET
CTW
CK1
Vth
VH
VL
CK2
tWR
tWD
tCKT
tCKW
Note : The MB3793 can monitor only one clock.
The MB3793 checks the clock signal at every other input pulse. Therefore, set watchdog
timer monitor time tWD to the time that allows the MB3793 to monitor the period twice as
long as the input clock pulse.
Document Number: 002-08550 Rev. *D Page 11 of 25
MB3793-27A
8.4 Inhibition operation (Positive clock pulse)
CTP
RESET
INH
CTW
CK1
CK2
VSH
VCC
VSL
Vth
VH
VL
tPR tWD tPR
tWR
tCKW
(1) (2) (3) (4)(5) (5) (6) (7) (11) (8) (9) (10) (12) (13)
tCKT
Document Number: 002-08550 Rev. *D Page 12 of 25
MB3793-27A
8.5 Clock pulse input supplementation (Positive clock pulse)
Note : The MB3793 watchdog timer monitors Clock1 (CK1) and Clock2 (CK2) pulses alternately.
When a CK2 pulse is detected after detecting a CK1 pulse, the monitoring time setting capacity (CTW)
switches to charging from discharging.
When two consecutive pulses occur on one side of this alternation before switching, the second pulse
is ignored.
In the above figure, pulse *1 and *2 are ignored.
Document Number: 002-08550 Rev. *D Page 13 of 25
MB3793-27A
9. Operation Sequence
9.1 Positive clock pulse input
See “1. Basic operation (positive clock pulse)” under “Diagram.”
9.2 Negative clock pulse input
See “2. Basic operation (negative clock pulse)” under “Diagram.”
The MB3793 operates in the same way whether it inputs positive or negative pulses.
9.3 Clock monitorin g
To use the MB3793 while monitoring only one clock, connect clock pins CK1 and CK2.
Although the MB3793 operates basically in the same way as when monitoring two clocks, it monitors the clock signal at every
other input pulse.
See “3. Single-clock input monitoring (positive clock pulse)” under “Diagram.”
9.4 Description of Operations
The numbers given to the following items correspond to numbers (1) to (13) used in “Diagram.”
(1) The MB3793 outputs a reset signal when the supply voltage (VCC) reaches about 0.8 V (VCCL)
(2) If VCC reaches or exceeds the rise-time detected voltage VSH, the MB3793 starts charging the power-on reset hold
time setting capacitor CTP. At this time, the output remains in a reset state. The VSH value is about 2.76 V.
(3) When CTP has been charged for a certain period of time TPR (until the CTP pin voltage exceeds the threshold voltage
(Vth) after the start of charging), the MB3793 cancels the reset (setting the RESET pin to “H” level from “L” level).
The Vth value is about 2.4 V with VCC = 3.3 V
The power-on reset hold time tPR is set with the following equation:
tPR (ms) ≈ A × CTP (μF)
The value of A is about 750 with VCC = 3.3 V and about 700 with VCC = 3.0 V. The MB3793 also starts charging the
watchdog time setting capacitor (CTW).
(4) When the voltage at the watchdog timer monitor time setting pin CTW reaches the “H” level threshold voltage VH, the
CTW switches from the charge state to the discharge state.
The value of VH is always about 1.24 V regardless of the detected voltage.
(5) If the CK2 pin inputs a clock pulse (positive edge trigger) when the CTW is being discharged in the CK1-CK2 order or
simultaneously, the CTW switches from the discharge state to the charge state.
The MB3793 repeats operations (4) and (5) as long as the CK1/CK2 pin inputs clock pulses with the system logic circuit
operating normally.
(6) If no clock pulse is fed to the CK1 or CK2 pin within the watchdog timer monitor time tWD due to some problem with the
system logic circuit, the CTW pin is set to the “L” level threshold voltage VL or less and the MB3793 outputs a reset
signal (setting the RESET pin to “L” level from “H” level).
The value of VL is always about 0.24 V regardless of the detected voltage.
The watchdog timer monitor time tWD is set with the following equation:
tWD (ms) ≈ B × CTW (μF)
The value of B is hardly affected by the power supply voltage; it is about 1600 with VCC = 3.0 V to 3.3 V.
Document Number: 002-08550 Rev. *D Page 14 of 25
MB3793-27A
(7) When a certain period of time tWR has passed (until the CTP pin voltage reaches or exceeds Vth again after recharging
the CTP), the MB3793 cancels the reset signal and starts operating the watchdog timer.
The watchdog timer monitor reset time tWR is set with the following equation:
tWR (ms) ≈ D x CTP (μF)
The value of D is 55 with VCC = 3.3 V and about 50 with VCC = 3.0 V.
The MB3793 repeats operations (4) and (5) as long as the CK1/CK2 pin inputs clock pulses. If no clock pulse is input,
the MB3793 repeats operations (6) and (7).
(8) If VCC is lowered to the fall-time detected voltage (VSL) or less, the CTP pin voltage decreases and the MB3793 outputs
a reset signal (setting the RESET pin to “L” level from “H” level).
The value of VSL is 2.7 V
(9) When VCC reaches or exceeds VSH again, the MB3793 starts charging the CTP.
(10) When the CTP pin voltage reaches or exceeds Vth, the MB3793 cancels the reset and restarts operating the watchdog
timer. It repeats operations (4) and (5) as long as the CK1/CK2 pin inputs clock pulses.
(11) Making the inhibit pin active (setting the INH pin to “H” from “L”) forces the watchdog timer to stop operation.
This stops only the watchdog timer, leaving the MB3793 monitoring VCC (operations (8) to (10)).
The watchdog timer remains inactive unless the inhibit input is canceled.
(12) Canceling the inhibit input (setting the INH pin to “L” from “H”) restarts the watchdog timer.
(13) The reset signal is output when the power supply is turned off to set VCC to VSL or less.
Document Number: 002-08550 Rev. *D Page 15 of 25
MB3793-27A
10. Typical Characteristics
Note: Without writing the value clearly, VCC = 3.3 (V), CTP = 0.1 (μF), CTW = 0.01 (μF).
40
35
30
25
20
15
10
Watchdog timer monitoring
f = 1 kHz
Duty = 10 %
VL = 0 V
VH = VCC
MB3793-27A
CTW CTP
VINH VCC
0.01 μF0.1 μF
01.0 2.0 3.0 4.0
Power supply voltage VCC(V)
Power supply current ICC (μA)
Power supply current vs. power supply voltage
(VINH = 0 V)
Ta = −40 °C to +85 °C
VSH (Ta = +25 °C)
MAX
VSL (Ta = +25 °C)
(Ta = −40 °C to +85 °C)
TYP
MIN
MAX
TYP
MIN
VSH
VSL
2.5
−20−40 0 +20 +40 +60 +80 +100
2.6
2.7
2.8
2.9
3.0
Operating ambient temperature Ta (°C)
Detection voltage VSH, VSL (V)
Detection voltage vs.
Operating ambient temperature
3.3
2.3
+85°C
+25°C
−40°C
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
2.4
−1−2−3−4−5
0
Reset output voltage vs. reset output current
Reset output voltage V
RESET
(V)
Reset output current I
RESET
(mA)
(P-MOS side)
1.0
00
+85°C
+25°C
−40°C
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
12345
Reset output voltage vs. reset output current
(N-MOS side)
Reset output voltage V
RESET
(V)
Reset output current IRESET (mA)
Document Number: 002-08550 Rev. *D Page 16 of 25
MB3793-27A
7
6
5
4
3
2
1
001234
Pull-up resistance 100 kΩ
Ta = +85 °C
Ta = +25 °C
Ta = −40 °C
Power supply voltage
VCC (V)
Reset output voltage
VRESET (V)
Reset output voltage vs. power supply voltage
−40 −20 0 +20 +40 +60 +80 +100
0
20
40
60
80
100
120
140
160
180
200 Ta = −40 °C to +85 °C
Ta = +25 °C
MAX
TYP
MIN
Operating ambient temperature Ta (°C)
Power-on reset hold time tPR (ms)
Power-on reset hold time vs.
Operating ambient temperature
(When Vcc rising)
−40 −20 0 +20 +40 +60 +80 +100
0
2
4
6
8
10
12
14
16
18
20
22
24
26
Ta = −40 °C to +85 °C
Ta = +25 °C
MAX
TYP
MIN
Operating ambient temperature Ta (°C)
Watchdog timer reset time tWR (ms)
Watchdog timer reset time vs.
Operating ambient temperature
(When monitoring)
−40 −20 0 +20 +40 +60 +80 +100
0
2
4
6
8
10
12
14
16
18
20
22
24
26 Ta = −40 °C to +85 °C
Ta = +25 °C
MAX
TYP
MIN
Operating ambient temperature Ta (°C)
Watchdog timer monitoring time tWD (ms)
Watchdog timer monitoring time vs.
Operating ambient temperature
Document Number: 002-08550 Rev. *D Page 17 of 25
MB3793-27A
104
103
102
101
1
10 −1
10−410−310−210−1110
1102
Ta = −40 °C
Ta = +25 °C
Ta = +85 °C
Power-on reset hold time setting capacitance
CTP (μF)
Power-on reset hold time vs. CTP capacitance
Power-on reset hold time tPR (ms)
103
102
101
1
10−1
10−410−310−210−1110
1102
10−2
Ta = −40 °C
Ta = +25 °C
Ta = +85 °C
Power-on reset hold time setting capacitance
CTP (μF)
Watchdog timer reset time tWR (ms)
Watchdog timer reset time vs. C
TP
capacitance
103
102
101
1
10−1
10−410−310−210−1110
1
10−5
Ta = −40 °C
Ta = +25 °C
Ta = +85 °C
Watchdog timer monitoring time
setting capacitance CTW (μF)
Watchdog timer monitoring time vs. CTW capacitance
Watchdog timer monitoring time tWD (ms)
Document Number: 002-08550 Rev. *D Page 18 of 25
MB3793-27A
11. Application Example
11.1 Supply voltage monitor and watchdog timer (1-clock monitor)
5
2
3
6
4
7
8
1
RESET
Microprocessor
VCC
RESET
CK
GND
GND
GND
CTW*CTP*
VCC
VCC
CTW
CTP CK1
CK2INH
MB3793
*: Use a capacitor with less leakage current.
The MB3793 monitors the clock (CK1, CK2) at every other input pulse.
Document Number: 002-08550 Rev. *D Page 19 of 25
MB3793-27A
11.2 Supply voltage monitor and watchdog timer stop
GND
C
TW
*C
TP
*
V
CC
RESET V
CC
CK
GND
RESET
Microprocessor 1 Microprocessor 2
V
CC
CK
GND
HALT
HALT
5
6
2
3
4
7
8
1
RESET
GND
V
CC
INH
CTW CK1
CK2CTP
MB3793
*: Use a capacitor with less leakage current.
Document Number: 002-08550 Rev. *D Page 20 of 25
MB3793-27A
12. Typical Application
2
3
6
1
8
7
4
5
VCC
CTW*CTP*
GND
INH GND
VCC
CTP
CTW RESET
CK1
CK2
RESET
Microprocessor 1 Microprocessor 2
CK
GND
VCC RESET
CK
GND
VCC
MB3793
1. Equation of time-setting capacitances (CTP and CTW) and set time
tPR [ms] ≈ A × CTP [μF]
tWD [ms] ≈ B × CTW [μF]
tWR [ms] ≈ D × CTP [μF]
Values of A, B, C, and D
2. Example (when CTP = 0.1 μF and CTW = 0.01 μF)
A B C D Remark
750 1600 0 55 VCC = 3.3 V
700 1600 0 50 VCC = 3.0 V
time
(ms)
Symbol VCC = 3.3 V VCC = 3.0 V
tPR ≈ 75 ≈ 70
tWD ≈ 16 ≈ 16
tWR ≈ 5.5 ≈ 5
*: Use a capacitor with less leakage current.
Document Number: 002-08550 Rev. *D Page 21 of 25
MB3793-27A
13. Notes On Use
• Take account of common impedance when designing the earth line on a printed wiring board.
• Take measures against static electricity.
- For semiconductors, use antistatic or conductive containers.
- When storing or carrying a printed circuit board after chip mounting, put it in a conductive bag or container.
- The work table, tools and measuring instruments must be grounded.
- The worker must put on a grounding device containing 250 kΩ to 1 MΩ resistors in series.
• Do not apply a negative voltage
- Applying a negative voltage of −0.3 V or less to an LSI may generate a parasitic transistor, resulting in
malfunction.
14. Ordering Information
15. RoHS Compliance Information
The LSI products of Cypress with “E1” are compliant with RoHS Directive , and has observed the standard of lead, cadmium,
mercury, Hexavalent chromium, polybrominated biphenyls (PBB) , and polybrominated diphenyl ethers (PBDE) .
The product that conforms to this standard is added “E1” at the end of the part number.
Part number Package Marking Remarks
MB3793-27APF-❏❏❏E1 8-pin Plastic SOP
(SOE008)3793-Y –
MB3793-27APNF-❏❏❏E1 8-pin Plastic SOP
(SOB008)3793-Y –
Document Number: 002-08550 Rev. *D Page 22 of 25
MB3793-27A
16. Package Dimensions
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b0.39 0.47 0.55
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DIMENSION
L20.25 BSC
11. JEDEC SPECIFICATION NO. REF : N/A
D
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BOTTOM VIEW
Package Code: SOE008
002-15857 Rev. **
Document Number: 002-08550 Rev. *D Page 23 of 25
MB3793-27A
$//',0(16,216$5(,10,//,0(7(5
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DIMENSIONS
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11. JEDEC SPECIFICATION NO. REF : N/A
D
4
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AA2
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Package Code: SOB008
002-15856 Rev. **
Document Number: 002-08550 Rev. *D Page 24 of 25
MB3793-27A
17. Major Changes
Spansion Publication Number: MB3793-27A_DS04-27404
NOTE: Please see “Document History” about later revised information.
Document History
Page Section Change Results
Revision 4.0
--Company name and layout design change
1DESCRIPTION Deleted "There is also a mask option that can detect voltages of 4.9 V to 2.4
V in 0.1-V steps."
Document Title: MB3793-27A Power Voltage Monitoring IC with Watchdog Timer
Document Number: 002-08550
Revision ECN Orig. of
Change Submission
Date Description of Change
** -TAOA 01/30/2015 Migrated to Cypress and assigned document number 002-08550.
No change to document contents or format.
*A 5169535 TAOA 04/01/2016 Updated to Cypress template
*B 5592786 HIXT 01/23/2017
Updated Pin Assignment:
Change the package name from FPT-8P-M01 to SOE008
Change the package name from FPT-8P-M02 to SOB008
Updated Ordering Information:
Change the package name from FPT-8P-M01 to SOE008
Change the package name from FPT-8P-M02 to SOB008
Updated Package Dimensions: Updated to Cypress format
Deleted “Marking Format (Lead Free version)”
Deleted “Labeling Sample (Lead free version)”
Deleted “MB3793-27APF- ❏❏❏ E1, MB3793-27APNF- ❏❏❏ E1
Recommended Conditions of Moisture Sensitivity Level”
Deleted the part numbers, MB3793-27APF- ❏❏❏ and MB3793-27APNF- ❏❏❏ , from
Ordering Information
Deleted the words in the Remarks, “Lead Free version”, from Ordering Information
*C 5790102 MASG 06/29/2017 Adapted Cypress new logo.
*D 6406322 YOST 12/10/2018 Obsoleted.
Document Number: 002-08550 Rev. *D Revised December 10, 2018 Page 25 of 25
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MB3793-27A
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