Ver: 1.1
Sep 30, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
1
G698/G699
Global Mixed-mode Technology Inc.
Microprocessor Reset IC
Features
Precision Monitoring of +3V, +3.3V, and +5V
Power-Supply Voltages
Fully Specified Over Temperature
Available in Three Output Configurations
Push-Pull RESET Output (G698L)
Push-Pull RESET Output (G698H)
Open-Drain RESET Output (G699L)
Externally Programmable Time Delay Generator
6µA Supply Current
Guaranteed Reset Valid to VCC = 0.8V
Power Supply Transient Immunity
5 pin SOT23-5 Packages
Applications
Computers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable / Battery-Powered Equipment
Automotive
General Description
The G698/G699 are microprocessor (µP) supervisory
circuits used to monitor the power supplies in µP and
digital systems. They provide excellent circuit reliability
and low cost and adjustments when used with +5V,
+3.3V, +3.0V - powered circuits.
These circuits perform a single function: they assert a
reset signal whenever the VCC supply voltage declines
below a preset threshold, with hysteresis keeping it
asserted for time delay determined by externally pro-
grammable time delay generator after VCC has risen
above the reset threshold. Reset thresholds suitable
for operation with a variety of supply voltages are
available.
The G699L has an open-drain output stage, while the
G698 have push-pull outputs. The G699L’s open-drain
RESET output requires a pull-up resistor that can be
connected to a voltage higher than VCC. The G698L
have an active-low RESET output, while the G698H
has an active-high RESET output. The reset com-
parator is designed to ignore fast transients on VCC,
and the outputs are guaranteed to be in the correct
logic state for VCC down to 0.8V.
Low supply current makes the G698/G699 ideal for
use in portable equipment. The G698/G699 are avail-
able in 5-pin SOT23-5 packages.
Ordering Information
ORDER NUMBER TEMP. RANGE PACKAGE
G698H(L)xxxT1U -40°C ~ +105°C SOT23-5
G699LxxxT1U -40°C ~ +105°C SOT23-5
Note:T1 : SOT23-5
U : Tape & Reel
* xxx specifies the threshold voltage.
e.g. 263 denotes the 2.63V threshold voltage.
Pin Configuration Typical Application Circuit
SOT23-5
G698/G699
5
1
2
RESET
(RESET)
43
GND
()is for G698H *G699 ONLY
RESET
INPUT
GND
µP
VCC
RESET
(RESET)
GND
G698/G699
VCC
CD
VCC
CD
Rpull-up*
CD VCC
GND
SOT23-5
G698/G699
5
1
2
RESET
(RESET)
43
GND
()is for G698H *G699 ONLY
RESET
INPUT
GND
µP
VCC
RESET
(RESET)
GND
G698/G699
VCC
CD
VCC
CD
Rpull-up*
CD VCC
GND
Ver: 1.1
Sep 30, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
2
G698/G699
Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
Terminal Voltage (with respect to GND)
VCC.……………………………..…….…….-0.3V to +6.0V
Delay Capacitor Pin Voltage, VCD…..-0.3 to (VCC +0.3V)
RESET, RESET (push-pull)....…....-0.3V to (VCC + 0.3V)
RESET (open drain)...…......…................-0.3V to +6.0V
Input Current, VCC ............................…..…............20mA
Output Current, RESET, RESET ......…...............20mA
Continuous Power Dissipation (TA = +70°C)
5-Pin SOT23-5 (derate 2.17mW/°C above +70°C).174mW
Operating Temperature Range …...…..-40°C to +105°C
Storage Temperature Range..….…......-65°C to +150°C
Lead Temperature (soldering, 10s).….….………+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause p’ermanent damage to the device. These are stress rat-
ings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of
the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Electrical Characteristics
(VCC = full range, TA = -40°C to +105°C, unless otherwise noted. Typical values are at TA = +25°C, VCC = 5V
for 463/438/400 versions, VCC= 3.3V for 308/293 versions, and VCC = 3V for 263 version.) (Note 1)
PARAMETER SYMBOL CONDITION MIN TYP MAX UNIT
T
A = 0°C +70°C 0.8 - 5.5
VCC Range
T
A = -40°C +105°C 1 - 5.5 V
V
CC<5.5V, G69_ _463/438/400/330_ - 6 10
Supply Current (SOT23-5) ICC
V
CC<3.6V, G69_ _308/293/263_ - 5 8.5 µA
G69_ _463_ 4.537 4.63 4.722
G69_ _438_ 4.293 4.38 4.467
G69_ _400_ 3.92 4 4.08
G69_ _330_ 3.234 3.30 3.366
G69_ _308_ 3.019 3.08 3.141
G69_ _293_ 2.872 2.93 2.988
Reset Threshold VTH-
G69_ _263_ 2.578 2.63 2.7
V
G69__463_ 139 231 324
G69__438_ 132 219 306
G69__400_ 120 200 280
G69__330_ 99 165 231
G69__308_ 93 154 215
G69__293_ 88 146 205
Reset Threshold Hystersis VHYS
G69__263_ 79 131 184
mV
Reset Threshold Tempco - 70 - ppm/°C
V
CC = 5V G69_ _ 463/438/400/330__ 3 3.3 3.9 V
V
CC =3.3V G69_ _308/293 1.9 2.3 2.7
CD Delay Pin Threshold Voltage VTDC
V
CC =3.0V G69_ 263_ 1.8 2.2 2.6
Delay Capacitor Pin Sink Current ICD
V
CC = 1.5V, VCD = 0.5V 3 5 - mA
Delay Pull up Resistance RD 1 1.5 2.3 MΩ
Ver: 1.1
Sep 30, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
3
G698/G699
Global Mixed-mode Technology Inc.
Electrical Characteristics (Continued)
(VCC = full range, TA = -40°C to +105°C, unless otherwise noted. Typical values are at TA = +25°C, VCC = 5V
for 463/438/400/330 versions, VCC= 3.3V for 308/293 versions, and VCC = 3V for 263 version.) (Note 1)
PARAMETER SYMBOL CONDITION MIN TYP MAX UNIT
RESET Output Current Low (push-pull active low,
and open-drain active-low, G698L and G699L) IOL VCC = 2.5V, V RESET = 0.5V 8 mA
VCC = 5V, V RESET = 4.5V,
G698L463/438/400/330 4.5
VCC = 3.3V, V RESET = 2.8V,
G698L308/293 3
RESET Output Current High (push-pull active
low, G698L) IOH
VCC = 3V, V RESET = 2.5V,
G698L263 2
mA
VCC = 5V, VRESET = 0.5V,
G698H463/438/400/330 16
VCC = 3.3V, VRESET = 0.5V,
G698H308/293 12
RESET Output Current Low (push-pull active
high, G698H) IOL
VCC = 3V, VRESET = 0.5V,
G698H263 10
mA
RESET Output Current High (push-pull active
high, G698H) IOH V
CC = 2.5V, VRESET = 2V 2 mA
RESET Open-Drain Output Leakage Current
(G699L)
V
CC > VTH, RESET deasserted 1 µA
Note 1: Production testing done at TA = +25°C; limits over temperature guaranteed by design.
Selector Guide
PART/SUFFIX RESET THRESHOLD (V) OUTPUT TYPE TOP MARK
G699L463T1U 4.63 Open-Drain RESET 699Gx
G699L438T1U 4.38 Open-Drain RESET 699Fx
G699L400T1U 4.00 Open-Drain RESET 699Ex
G699L330T1U 3.30 Open-Drain RESET 699Dx
G699L308T1U 3.08 Open-Drain RESET 699Cx
G699L293T1U 2.93 Open-Drain RESET 699Bx
G699L263T1U 2.63 Open-Drain RESET 699Ax
G698H463T1U 4.63 Push-Pull RESET 698Lx
G698H438T1U 4.38 Push-Pull RESET 698Kx
G698H400T1U 4.00 Push-Pull RESET 698Jx
G698H330T1U 3.30 Push-Pull RESET 698Nx
G698H308T1U 3.08 Push-Pull RESET 698Ix
G698H293T1U 2.93 Push-Pull RESET 698Hx
G698H263T1U 2.63 Push-Pull RESET 698Gx
G698L463T1U 4.63 Push-Pull RESET 698Fx
G698L438T1U 4.38 Push-Pull RESET 698Ex
G698L400T1U 4.00 Push-Pull RESET 698Dx
G698L330T1U 3.30 Push-Pull RESET 698Mx
G698L308T1U 3.08 Push-Pull RESET 698Cx
G698L293T1U 2.93 Push-Pull RESET 698Bx
G698L263T1U 2.63 Push-Pull RESET 698Ax
Ver: 1.1
Sep 30, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
4
G698/G699
Global Mixed-mode Technology Inc.
Typical Operating Characteristics
(VCC = full range, TA = -40°C to +105°C, unless otherwise noted. Typical values are at TA = +25°C, VCC = 5V
for 463/438/400/330 versions, VCC= 3.3V for 308/293 versions, and VCC = 3V for 263 version.)
CD Delay Pin Sink Current vs. Voltage
0
5
10
15
20
25
30
35
40
32.41.81.20.60.40.20.05
VCD, Delay Pin Voltage (V)
ICD, CD DELAY PIN SINK CURRENT (mA
)
VCC=3V
VCC=2.5V
VCC=1.5V
Output Time Delay vs. Capacitance
0.1
1
10
100
1000
10000
0.0001 0.001 0.01 0.1 1
CD, Delay Pin Capacitance (µF)
Output Time Delay
Delay between VCC>VTH to output change (ms)
Delay between VCC<VTH to output change (µs)
Delay Resistance vs. Temperature
1.3
1.35
1.4
1.45
1.5
1.55
1.6
1.65
1.7
1.75
-40-30-20-100 102030405060708090
TA, Ambient Temperature (°C)
RD, Delay Resistance (M Ω)
Supply Current vs. VCC
0
1
2
3
4
5
6
7
8
0 0.6 1 1.2 1.5 1.8 2.1 2.4 2.7 3 3.2 3.3 3.4 3.5 3.7 3.9 4 4.5 5 5.5 6
VCC (V)
Supply Current (µA)
Reset Output Time Delay vs. Temperature
0
50
100
150
200
250
300
-40-30-20-10 0 102030405060708090
TA, Ambient Temperature (°C)
Output Time Delay (ms)
CD=0.1µF
Normalized Reset Threshold vs. Temperature
0.96
0.97
0.98
0.99
1
1.01
1.02
1.03
1.04
1.05
1.06
-40-30-20-100 10202730405060708090
TA, Ambient Temperature (°C)
Normalized Ormalized VTH+, VTH- (V)
VT
VTH
Supply Curremt vs. Temperature (No Load)
0
1
2
3
4
5
6
7
-40-200 20406080
Temperature (°C)
Supply Current (µA)
VCC=5V
VCC=3.3V
VCC=2.5V
Ver: 1.1
Sep 30, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
5
G698/G699
Global Mixed-mode Technology Inc.
Timing Diagram
Figure 1
Functional Diagram
Figure 2
() is for G698H
5VCC
VTH
RESET
4
2GND 1C
D
+
RD
5VCC
VTH
RESET
(RESET)
4
2GND 1C
D
+
RD
*
() is for G698H
5VCC
VTH
RESET
4
2GND 1C
D
+
RD
5VCC
VTH
RESET
(RESET)
4
2GND 1C
D
+
RD
*
VCC
VTH+
VTH-
VCC
VCC
VCC
VTH-
VTH-
0V
0V
tD2
VCC, Pin 5
CD, Pin 1 0.675 VIN
Reset Output
(Active Low), Pin 4
Reset Output
(Active High), Pin 4
VCC
VTH+
VTH-
VCC
VCC
VCC
VTH-
VTH-
0V
0V
tD2
VCC, Pin 5
CD, Pin 1 0.675 VIN
Reset Output
(Active Low), Pin 4
Reset Output
(Active High), Pin 4
Ver: 1.1
Sep 30, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
6
G698/G699
Global Mixed-mode Technology Inc.
Pin Description
PIN NAME FUNCTION
1 CD External Programmable time delay is set by the capacitor connect to CD pin.
2.3 GND Ground
RESET (G698L/G699L) RESET Output remains low while VCC is below the reset threshold, and for delay time set by CD
after VCC rises above the reset threshold.
4
RESET (G698H) RESET Output remains high while VCC is below the reset threshold, and for delay time set by
CD after VCC rises above the reset threshold.
5 VCC Supply Voltage (+5V, +3.3V, +3.0V)
Detailed Description
A microprocessor’s (µP’s) reset input starts the µP in a
known state. The G699L/G698L/G698H assert reset to
prevent code-execution errors during power-up,
power-down, or brownout conditions. They assert a
reset signal whenever the VCC supply voltage declines
below a preset threshold (VTH-), keeping it asserted for
time delay set by capacitor connected to CD pin, after
VCC has risen above the high reset threshold VTH+
(VTH-+VHYS). The G699L uses an open-drain output,
and the G698L/G698H have a push-pull output stage.
Connect a pull-up resistor on the G699L’s RESET out-
put to any supply between 0 and 5.5V.
The time delay is set by external capacitor CD, and
internal pull up resistor RD. When the voltage at CD
pin exceeds the buffer threshold, typically 0.675 VCC,
the RESET output high (RESET output low). The
voltage detector and buffer have built-in hysterisis to
prevent erratic reset operation. The formula of time
delay is T (ms) ≅ 1685 CD (µF). Fig1 and Fig2 show a
timing deagram and a Functional Block.
Ensuring a Valid Reset Output Down to VCC = 0
When VCC falls below 0.8V, the G698 RESET output
no longer sinks current—it becomes an open circuit.
Therefore, high-impedance CMOS logic inputs con-
nected to RESET can drift to undetermined voltages.
This presents no problem in most applications since
most µP and other circuitry is inoperative with VCC
below 0.8V. However, in applications where RESET
must be valid down to 0V, adding a pull-down resistor
to RESET causes any stray leakage currents to flow
to ground, holding RESET low (Figure 3). R1’s value
is not critical; 100kΩ is large enough not to load
RESET and small enough to pull RESET to ground.
A 100kΩ pull-up resistor to VCC is also recommended
for the G699L if RESET is required to remain valid
for VCC < 0.8V.
Figure3. RESET Valid to VCC = Ground Circuit
VCC
RESET
GND
G698
R1
100k
VCC
RESET
GND
G698
R1
100k
Ver: 1.1
Sep 30, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
7
G698/G699
Global Mixed-mode Technology Inc.
Interfacing to µPs with Bidirectional Reset Pins
Since the RESET output on the G699L is open drain,
this device interfaces easily with µPs that have bidi-
rectional reset pins, such as the Motorola 68HC11.
Connecting the µP supervisor’s RESET output di-
rectly to the microcontroller’s (µC’s) RESET pin with
a single pull-up resistor allows either device to assert
reset (Figure 4).
Figure 4. Interfacing to µPs with Bidirectional Reset
I/O
G699L Open-Drain RESET Output Allows Use with
Multiple Supplies
Generally, the pull-up connected to the G699L will
connect to the supply voltage that is being monitored
at the IC’s VCC pin. However, some systems may use
the open-drain output to level-shift from the monitored
supply to reset circuitry powered by some other supply
(Figure 5). Note that as the G699L’s VCC decreases
below 1V, so does the IC’s ability to sink current at
RESET . Also, with any pull-up, RESET will be pulled
high as VCC decays toward 0. The voltage where this
occurs depends on the pull-up resistor value and the
voltage to which it is connected.
Figure 5. G699L Open-Drain RESET Output Allows
Use with Multiple Supplies
Benefits of Highly Accurate Reset Threshold
Most µP supervisor ICs have reset threshold voltages
between 5% and 10% below the value of nominal
supply voltages. This ensures a reset will not occur
within 5% of the nominal supply, but will occur when
the supply is 10% below nominal.
When using ICs rated at only the nominal supply ±5%,
this leaves a zone of uncertainty where the supply is
between 5% and 10% low, and where the reset may or
may not be asserted.
The G69_ _463/G69_ _308 use highly accurate circuitry
to ensure that reset is asserted close to the 5% limit,
and long before the supply has declined to 10% below
nominal.
RESET
INPUT
GND
µP
VCC
RESET
GND
G699
VCC
VCC
MOTOROLA
68HCXX
RPULL-UP
RESET
INPUT
GND
µP
VCC
RESET
GND
G699
VCC
VCC
MOTOROLA
68HCXX
RPULL-UP
RESET
INPUT
GND
5V SYSTEM
VCC
RESET
GND
G699
VCC
RPULL-UP
+3.3V
+5.0
RESET
INPUT
GND
5V SYSTEM
VCC VCC
RPULL-UP
+3.3V
+5.0V
RESET
INPUT
GND
5V SYSTEM
VCC
RESET
GND
G699
VCC
RPULL-UP
+3.3V
+5.0
RESET
INPUT
GND
5V SYSTEM
VCC VCC
RPULL-UP
+3.3V
+5.0V
Ver: 1.1
Sep 30, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
8
G698/G699
Global Mixed-mode Technology Inc.
Package Information
Note:
1. Package body sizes exclude mold flash protrusions or gate burrs
2. Tolerance ±0.1000 mm (4mil) unless otherwise specified
3. Coplanarity: 0.1000mm
4. Dimension L is measured in gage plane
DIMENSIONS IN MILLIMETER
SYMBOL MIN NOM MAX
A 1.00 1.10 1.30
A1 0.00 ----- 0.10
A2 0.70 0.80 0.90
b 0.35 0.40 0.50
C 0.10 0.15 0.25
D 2.70 2.90 3.10
E 1.40 1.60 1.80
e ----- 1.90(TYP) -----
e1 ----- 0.95 -----
H 2.60 2.80 3.00
L 0.37 ------ -----
θ1 1º 5º 9º
Taping Specification
GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications.
E
e
D
H
θ1
L
C
b
A2
A1
A
e1
E
e
D
H
θ1
L
C
b
A2
A1
A
e1
Feed Direction
SOT23-5 Package Orientation
Feed Direction
SOT23-5 Package Orientation
