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S4242 Datasheet(PDF) 1 Page - Summit Microelectronics, Inc.

Part No. S4242
Description  Dual Voltage Supervisory Circuit With Watchdog Timer
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Maker  SUMMIT [Summit Microelectronics, Inc.]
Homepage  http://www.summitmicro.com
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 1 page
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SUMMIT MICROELECTRONICS, Inc.
300 Orchard City Drive, Suite 131
Campbell, CA 95008
Telephone 408-378-6461
Fax 408-378-6586
www.summitmicro.com
1
© SUMMIT MICROELECTRONICS, Inc. 2000
2025 6.0 4/17/00
Characteristics subject to change without notice
FEATURES
Precision Dual Voltage Monitor
–VCC Supply Monitor
- Dual reset outputs for complex
microcontroller systems
- Integrated memory write lockout function
- No external components required
Second Voltage Monitor Output
– Separate VLOW output
– Generates interrupt to MCU
– Generates RESET for dual supply systems
- Guaranteed output assertion to VCC - 1V
Watchdog Timer (S42WD42, S42WD61)
–1.6s
Memory Internally Organized 2 x8
Extended Programmable Functions
Available on SMS24
Dual Voltage Supervisory Circuit
With Watchdog Timer(S42WD61) (S42WD42)
S4242/S42WD42/S4261/S42WD61
High Reliability
– Endurance: 100,000 erase/write cycles
– Data retention: 100 years
OVERVIEW
The S42xxx are a precision power supervisory circuit. It
automatically monitors the device’s VCC level and will
generate a reset output on two complementary open drain
outputs. In addition to the VCC monitoring, the S42xxx also
provides a second voltage comparator input. This input
has an independent open drain output that can be wire-
OR’ed with the RESET I/O or it can be used as a system
interrupt.
The S42xxx also has an integrated 4k/16k-bit nonvolatile
memory. The memory conforms to the industry standard
two-wire serial interface. In addition to the reset circuitry,
the S42WD42/S42WD61 also has a watchdog timer.
BLOCK DIAGRAM
PROGRAMMABLE
WATCHDOG
TIMER
+
GND
VCC
8
4
RESET#
2
VTRIP
RESET
CONTROL
RESET
7
1.26V
SCL
6
SDA
5
2025 T BD 2.0
WRITE
CONTROL
NONVOLATILE
MEMORY
ARRAY
PROGRAMMABLE
RESET PULSE
GENERATOR
+
VLOW#
UV
OV
VSENSE 3
1
(S42WD42,
S42WD61)




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