Global Mixed-mode Technology
G660/G661/G662
Microprocessor Reset IC
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)
.
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 10
µ
A at V
CC
=3.3V
SOT-23-5 Package
Temperature Range . . .
−40
°
C to 85
°
C
Applications
Critical
μ
P and
μ
C Power Monitoring
Industrial Equipment
Programmable Controls
Automotive Systems
Portable/Battery-Powered Equipment
Intelligent Instruments
Wireless Communications Systems
Notebook/Desktop Computers
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
3.3V
G660/G661
RESET
(RESET)
GND
1
5
VCC RESET
1
G662
5
VCC
VCC
RESET
100nF
VCC
RESET
G660/G661/
2
GND
2
G662
*
MR
WDI
4
SOT-23-5
WDI
RESET
GND
µP
I/O
RESET
GND
MR
3
SOT-23-5
4
WDI
RESET
3
()is for G660H
*
MR is for G660/G661
**
RESET
i
s for G662
ICC may increased at high T
A
, Therefore, can not connect
Resistors to VCC to prevent Icc abnormal behavior at high T
A
.
Ver: 0.7
Apr 09, 2012
TEL: 886-3-5788833
http://www.gmt.com.tw
1
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