Ver: 1.3
Jun 03, 2004
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
14A Supply Current
Guaranteed Reset Valid to V
CC
= 0.8V
Power Supply Transient Immunity
5 pin SOT23-5 Packages
2% Threshold Accuracy
Applications
Computers
Controllers
Intelligent Instruments
Critical P and C Power Monitoring
Portable / Battery-Powered Equipment
Automotive
General Description
The G698/G699 are microprocessor (P) supervisory
circuits used to monitor the power supplies in P 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 V
CC
supply voltage declines
below a preset threshold, with hysteresis keeping it
asserted for time delay determined by externally pro-
grammable time delay generator after V
CC
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 V
CC
. 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 V
CC
,
and the outputs are guaranteed to be in the correct
logic state for V
CC
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
-40C ~ +105C SOT23-5
G699LxxxT1U
-40C ~ +105C
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)
4
3
GND
()is for G698H
*G699 ONLY
RESET
INPUT
GND
P
VCC
RESET
(RESET)
GND
G698/G699
VCC
CD
V
CC
C
D
R
pull-up*
CD
VCC
GND
SOT23-5
G698/G699
5
1
2
RESET
(RESET)
4
3
GND
()is for G698H
*G699 ONLY
RESET
INPUT
GND
P
VCC
RESET
(RESET)
GND
G698/G699
VCC
CD
V
CC
C
D
R
pull-up*
CD
VCC
GND
Ver: 1.3
Jun 03, 2004
TEL: 886-3-5788833
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2
G698/G699
Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
Terminal Voltage (with respect to GND)
V
CC
..................................................-0.3V to +6.0V
Delay Capacitor Pin Voltage, V
CD
.....-0.3 to (V
CC
+0.3V)
RESET, RESET (push-pull)...........-0.3V to (V
CC
+ 0.3V)
RESET (open drain)...............................-0.3V to +6.0V
Input Current, V
CC
................................................20mA
Output Current, RESET, RESET ........................20mA
Continuous Power Dissipation (T
A
= +70C)
5-Pin SOT23-5 (derate 2.17mW/C above +70C).174mW
Operating Temperature Range ...........-40C to +105C
Storage Temperature Range...............-65C to +150C
Lead Temperature (soldering, 10s)..................+260C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent 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
(V
CC
= full range, T
A
= -40C to +105C, unless otherwise noted. Typical values are at T
A
= +25C, V
CC
= 5V
for 463/438/400 versions, V
CC
= 3.3V for 308/293 versions, and V
CC
= 3V for 263 version.) (Note 1)
PARAMETER SYMBOL CONDITION
MIN
TYP
MAX
UNIT
T
A
= 0C +70C
0.8
---
5.5
V
CC
Range
T
A
= -40C +105C
1
--- 5.5
V
V
CC
<5.5V, G69_ _463/438/400/330_
--- 16.5 25
Supply Current (SOT23-5)
I
CC
V
CC
<3.6V, G69_ _308/293/263_
--- 13.9 22
A
G69_ _463_
4.50
4.60
4.69
G69_ _438_
4.23
4.32
4.40
G69_ _400_
3.88
3.96
4.04
G69_ _330_
3.25
3.30
3.37
G69_ _308_
3.04
3.10
3.16
G69_ _293_
2.86
2.91
2.96
Reset Threshold
V
TH-
G69_ _263_
2.59
2.64
2.69
V
Reset Threshold Hysterisis
V
HYS
3.6
5.3
7
%
Reset Threshold Tempco
---
70
---
ppm/C
C
D
Delay Pin Threshold Voltage
V
TDC
0.87 1.25
1.29 V
Delay Capacitor Pin Sink Current
V
CC
= 1.5V, V
CD
= 0.5V
3
5
---
mA
Delay Capacitor Pin Source Current
I
CD
V
CC
> V
TH-
+ V
HYS
0.5
0.88
1.2
A
RESET
Output Current Low (push-pull
active low,
and open-drain active-low, G698L and
G699L)
I
OL
V
CC
= 2.5V, V
RESET
= 0.5V
8 ---
--- mA
V
CC
= 5V, V
RESET
= 4.5V,
G698L463/438/400/330
4.5 --- ---
V
CC
= 3.3V, V
RESET
= 2.8V,
G698L308/293
3 ---
---
RESET
Output Current High
(push-pull active low, G698L)
I
OH
V
CC
= 3V, V
RESET
= 2.5V,
G698L263
2 ---
---
mA
V
CC
= 5V, V
RESET
= 0.5V,
G698H463/438/400/330
16 --- ---
V
CC
= 3.3V, V
RESET
= 0.5V,
G698H308/293
12 --- ---
RESET Output Current Low (push-pull
active high, G698H)
I
OL
V
CC
= 3V, V
RESET
= 0.5V,
G698H263
10 --- ---
mA
RESET Output Current High
(push-pull active high, G698H)
I
OH
V
CC
= 2.5V, V
RESET
= 2V
2
---
---
mA
RESET
Open-Drain Output Leakage
Current (G699L)
V
CC
> V
TH
, RESET deasserted
--- --- 1 A
Note 1: Production testing done at T
A
= +25C; limits over temperature guaranteed by design.
Ver: 1.3
Jun 03, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
3
G698/G699
Global Mixed-mode Technology Inc.
Selector Guide
PART/SUFFIX
RESET THRESHOLD (V)
OUTPUT TYPE
TOP MARK
G699L463T1U 4.60
Open-Drain
RESET
699Gx
G699L438T1U 4.32
Open-Drain
RESET
699Fx
G699L400T1U 3.96
Open-Drain
RESET
699Ex
G699L330T1U 3.30
Open-Drain
RESET
699Dx
G699L308T1U 3.10
Open-Drain
RESET
699Cx
G699L293T1U 2.91
Open-Drain
RESET
699Bx
G699L263T1U 2.64
Open-Drain
RESET
699Ax
G698H463T1U 4.60
Push-Pull
RESET
698Lx
G698H438T1U
4.32 Push-Pull
RESET 698Kx
G698H400T1U 3.96
Push-Pull
RESET
698Jx
G698H330T1U 3.30
Push-Pull
RESET
698Nx
G698H308T1U 3.10
Push-Pull
RESET
698Ix
G698H293T1U 2.91
Push-Pull
RESET
698Hx
G698H263T1U 2.64
Push-Pull
RESET
698Gx
G698L463T1U 4.60
Push-Pull
RESET
698Fx
G698L438T1U 4.32
Push-Pull
RESET
698Ex
G698L400T1U 3.96
Push-Pull
RESET
698Dx
G698L330T1U 3.30
Push-Pull
RESET
698Mx
G698L308T1U 3.10
Push-Pull
RESET
698Cx
G698L293T1U 2.91
Push-Pull
RESET
698Bx
G698L263T1U 2.64
Push-Pull
RESET
698Ax
Ver: 1.3
Jun 03, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
4
G698/G699
Global Mixed-mode Technology Inc.
Typical Operating Characteristics
(V
CC
= full range, T
A
= -40C to +105C, unless otherwise noted. Typical values are at T
A
= +25C, V
CC
= 5V
for 463/438/400/330 versions, V
CC
= 3.3V for 308/293 versions, and V
CC
= 3V for 263 version.)
C
D
Delay Pin Sink Current vs. Voltage
0
5
10
15
20
25
30
35
40
3
2.4
1.8
1.2
0.6
0.4
0.2
0.05
V
CD
, Delay Pin Voltage (V)
I
CD
, C
D
DELAY PIN SINK CURRENT (mA)
V
CC
=3V
V
CC
=2.5V
V
CC
=1.5V
Output Time Delay vs. Capacitance
0.1
1
10
100
1000
10000
0.0001
0.001
0.01
0.1
1
C
D
, Delay Pin Capacitance (F)
Output Time Delay
Delay between V
CC
>V
TH
to output change
Delay between V
CC
<V
TH
to output change
Supply Current vs. V
CC
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
V
CC
(V)
Supply Current (A)
Reset Output Time Delay vs. Temperature
0
50
100
150
200
250
300
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
T
A
, Ambient Temperature (C)
Output Time Delay (ms)
C
D
=0.1F
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 -10 0
10 20 27 30 40 50 60 70 80 90
T
A
, Ambient Temperature (C)
Normalized Ormalized V
TH+
, V
TH-
(V)
V
T
V
TH
Supply Curremt vs. Temperature (No Load)
0
1
2
3
4
5
6
7
-40
-20
0
20
40
60
80
Temperature (C)
Supply Current (A)
V
CC
=5V
V
CC
=3.3V
V
CC
=2.5V
Ver: 1.3
Jun 03, 2004
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
V
CC
V
TH
+
V
TH
-
V
CC
V
CC
V
CC
V
TH
-
V
TH
-
0V
0V
t
D2
V
CC
, Pin 5
C
D
, Pin 1
0.675 V
IN
Reset Output
(Active Low), Pin 4
Reset Output
(Active High), Pin 4
V
CC
V
TH
+
V
TH
-
V
CC
V
CC
V
CC
V
TH
-
V
TH
-
0V
0V
t
D2
V
CC
, Pin 5
C
D
, Pin 1
0.675 V
IN
Reset Output
(Active Low), Pin 4
Reset Output
(Active High), Pin 4
() is for G698H
2
V
CC
V
TH
RESET
1
3 GND 5 C
D
+
2
V
CC
V
TH
RESET
(RESET)
1
3 GND 5 C
D
+
*
I
CD
I
CD
() is for G698H
2
V
CC
V
TH
RESET
1
3 GND 5 C
D
+
2
V
CC
V
TH
RESET
(RESET)
1
3 GND 5 C
D
+
*
I
CD
I
CD
Ver: 1.3
Jun 03, 2004
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 C
D
pin.
2.3 GND
Ground
RESET
(G698L/G699L)
RESET
Output remains low while V
CC
is below the reset threshold, and for delay time set by C
D
after V
CC
rises above the reset threshold.
4
RESET (G698H)
RESET Output remains high while V
CC
is below the reset threshold, and for delay time set by
C
D
after V
CC
rises above the reset threshold.
5
VCC
Supply Voltage (+5V, +3.3V, +3.0V)
Detailed Description
A microprocessor's (P's) reset input starts the P 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 V
CC
supply voltage declines
below a preset threshold (V
TH-
), keeping it asserted for
time delay set by capacitor connected to C
D
pin, after
V
CC
has risen above the high reset threshold V
TH+
(V
TH-
+V
HYS
). 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 C
D
, and
internal pull up current I
CD
. When the voltage at C
D
pin exceeds the buffer threshold, typically 1.25V, the
RESET output high (RESET output low). The volt-
age detector and buffer have built-in hysterisis to
prevent erratic reset operation. The formula of time
delay is T (ms)
1685 C
D
(F). Fig1 and Fig2 show a
timing deagram and a Functional Block.
Ensuring a Valid Reset Output Down to V
CC
= 0
When V
CC
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 P 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; 100k
is large enough not to load
RESET and small enough to pull RESET to ground.
A 100k
pull-up resistor to V
CC
is also recommended
for the G699L if RESET is required to remain valid
for V
CC
< 0.8V.
Figure3.
RESET
Valid to V
CC
= Ground Circuit
VCC
RESET
GND
G698
R1
100k
VCC
RESET
GND
G698
R1
100k
Ver: 1.3
Jun 03, 2004
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7
G698/G699
Global Mixed-mode Technology Inc.
Interfacing to Ps with Bidirectional Reset Pins
Since the RESET output on the G699L is open drain,
this device interfaces easily with Ps that have bidi-
rectional reset pins, such as the Motorola 68HC11.
Connecting the P supervisor's RESET output di-
rectly to the microcontroller's (C's) RESET pin with
a single pull-up resistor allows either device to assert
reset (Figure 4).
Figure 4. Interfacing to Ps 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 V
CC
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 V
CC
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 P 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
P
RESET
GND
G699
V
CC
MOTOROLA
68HCXX
R
PULL-UP
VCC
VCC
RESET
INPUT
GND
P
RESET
GND
G699
V
CC
MOTOROLA
68HCXX
R
PULL-UP
VCC
VCC
RESET
INPUT
GND
5V SYSTEM
RESET
GND
G699
R
PULL-UP
+3.3V
+5.0
RESET
INPUT
GND
5V SYSTEM
VCC
R
PULL-UP
+3.3V
+5.0V
VCC
RESET
INPUT
GND
5V SYSTEM
RESET
GND
G699
R
PULL-UP
+3.3V
+5.0
RESET
INPUT
GND
5V SYSTEM
VCC
R
PULL-UP
+3.3V
+5.0V
VCC
Ver: 1.3
Jun 03, 2004
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 ------ -----
1
1 5 9
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
1
L
C
b
A2
A1
A
e1
E
e
D
H
1
L
C
b
A2
A1
A
e1
Feed Direction
SOT23-5 Package Orientation
Feed Direction
SOT23-5 Package Orientation
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