Global Mixed-mode Technology Inc.
G698/G699
Microprocessor Reset IC
Features
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.
ꢀ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)
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.
Open-Drain RESET Output (G699L)
ꢀExternally Programmable Time Delay Generator
ꢀ14µA Supply Current
ꢀGuaranteed Reset Valid to VCC = 0.8V
ꢀPower Supply Transient Immunity
ꢀ5 pin SOT23-5 Packages
ꢀ2% Threshold Accuracy
The G699L has an open-drain output stage, while the
G698 have push-pull outputs. The G699L’s open-drain
Applications
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.
ꢀComputers
ꢀControllers
ꢀIntelligent Instruments
ꢀCritical µP and µC Power Monitoring
ꢀPortable / Battery-Powered Equipment
ꢀAutomotive
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
SOT23-5
SOT23-5
G698H(L)xxxT1U
G699LxxxT1U
-40°C ~ +105°C
-40°C ~ +105°C
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
VCC
CD
VCC
1
5
4
VCC
VCC
Rpull-up*
GND
GND
G698/G699
SOT23-5
G698/G699
2
3
µP
RESET
RESET
CD
INPUT
(RESET)
RESET
GND
GND
(RESET)
CD
()is for G698H
*G699 ONLY
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.3
Jun 03, 2004
1