G660 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – Microprocessor Reset IC

Global Mixed-mode Technology
G660/G661/G662
Microprocessor Reset IC
Features
„ Power-On Reset Generator With Fixed Delay
Time of 200ms
„ Manual Reset Input (G660/G661)
„ Available in three RESET Output Options
Push-Pull RESET Output (G660L/G662)
Push-Pull RESET Output (G660H/G662)
Open-Drain RESET Output (G661L)
„ Supply Voltage Supervision Range
2.5V, 3V, 3.3V, 5V
„ Watchdog Timer (G660/G661/G662)
„ Supply Current of 10µA at V_CC=3.3V
„ SOT-23-5 Package
„ Temperature Range . . . −40°C to 85°C
Applications
„ Critical μP and μC Power Monitoring
„ Industrial Equipment
„ Programmable Controls
„ Automotive Systems
„ Portable/Battery-Powered Equipment
„ Intelligent Instruments
„ Wireless Communications Systems
„ Notebook/Desktop Computers
General Description
The G660/G661/G662 provide circuits initialization and
timing supervision, primarily for DSP and proces-
sor-based systems. During power-on, RESET
(RESET) is asserted when supply voltage VCC be-
comes higher than 1.1 V. Thereafter, the supply volt-
age supervisor monitors VCC and keeps RESET
(RESET) active as long as VCC remains below the
threshold voltage V_IT+(1).
An internal timer delays the return of the output to the
inactive state to ensure proper system reset. The de-
lay time, td, starts after VCC has risen above the
threshold voltage V_IT+. When the supply voltage drops
below the threshold voltage V_IT-(2), the outputs be-
comes active again. No external components are re-
quired. All the devices have a fixed-sense threshold
voltage V_IT- set by an internal voltage divider.
The G660/G661 incorporate a manual reset input, MR .
A low level at MR causes RESET (RESET) to be-
come active. The G660/G661/G662 have WDI pin.
The watchdog timer is periodically triggered by a posi-
tive or negative transition at WDI. When the supervis-
ing system fails to retrigger the watchdog circuit within
the time-out interval, t_tout, RESET (RESET) becomes
active for the time period td. This event also reinitial-
izes the watchdog timer. Leaving WDI unconnected
disables the watchdog.
The product spectrum is designed for supply voltages
of 2.5V, 3V, 3.3V, and 5V. The circuits are available in
a SOT-23-5 package.
Note:
(1) V_IT+ means the reset voltage of V_CC from low to high
(2) V_IT- means the reset voltage of V_CC from high to low.
Pin Configuration
Typical Application Circuit
G660/G661
RESET ¹
(RESET)
5 VCC RESET 1
GND 2
GND 2
G662
5 VCC
MR 3
SOT-23-5
()is for G660H
4 WDI RESET 3
SOT-23-5
4 WDI
VCC
RESET
G660/G661/
* G662
MR
WDI
RESET
GND
100nF
3.3V
VCC
RESET
µP
I/O
RESET
GND
* MR is for G660/G661
** RESET is for G662
ICC may increased at high TA, Therefore, can not connect
Resistors to VCC to prevent Icc abnormal behavior at high TA.
Ver: 0.7
Apr 09, 2012
TEL: [phone]
http://www.gmt.com.tw
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