G656 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – Microprocessor Reset IC

Global Mixed-mode Technology
G656/G657
Microprocessor Reset IC
Features
„ Precision Monitoring Voltage of +2.2V and
+3.7V
„ Fully Specified Over Temperature
„ Available in Three Output Configurations
Push-Pull RESET Output (G656L)
Push-Pull RESET Output (G656H)
Open-Drain RESET Output (G657L)
„ Reset Deassert Time Smaller than 100µs when
V_CC Higher than Monitor Voltages (CD Pin Float-
ing)
„ Externally Programmable Time Delay Generator
„ 27µA Supply Current at V_CC=3.3V
„ Guaranteed Reset Valid to V_CC = 0.8V
„ TSOT-23-5 Packages
„ 2% Threshold Accuracy
Applications
„ Computers
„ Controllers
„ Intelligent Instruments
„ Critical µP and µC Power Monitoring
„ Portable / Battery-Powered Equipment
„ Automotive
General Description
The G656/G657 are microprocessor (µP) supervisory
circuits used to monitor the power supplies in µP and
digital systems. They provide excellent circuit reliability
and low cost.
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.
The G657L has an open-drain output stage, while the
G656 have push-pull outputs. The G657L’s open-drain
RESET output requires a pull-up resistor that can be
connected to a voltage higher than V_CC. The G656L
has an active-low RESET output, while the G656H
has an active-high RESET output. The outputs are
guaranteed to be in the correct logic state for V_CC
down to 0.8V.
The G656/G657 are available in 5-pin TSOT-23-5
package.
Pin Configuration
Typical Application Circuit
RESET ¹
(RESET)
VCC 2
G656/G657
5 CD
GND 3
TSOT-23-5
()is for G656H
4 NC
V_CC
VCC
G656/G657
CD
RESET
(RESET)
C_D
GND
R_pull-up*
VCC
µP
RESET
INPUT
GND
*G657 only
ICC may increased at high TA, Therefore, can not connect
Resistors to VCC to prevent Icc abnormal behavior at high TA.
Ver: 0.4
Apr 10, 2012
TEL: [phone]
http://www.gmt.com.tw
1