G698 Datasheet, PDF (1/8 Pages) Global Mixed-mode Technology Inc – Microprocessor Reset IC

Global Mixed-mode Technology Inc.
G698/G699
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
„14µA 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 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 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 -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
CD 1
5 VCC
GND ₂ G698/G699
GND 3
SOT23-5
()is for G698H
4 RESET
(RESET)
V_CC
VCC
G698/G699
CD
RESET
(RESET)
GND
C_D
R_pull-up*
VCC
µP
RESET
INPUT
GND
*G699 ONLY
Ver: 1.3
Jun 03, 2004
TEL: [phone]
http://www.gmt.com.tw
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