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CAT1161PI-42 Datasheet, PDF (1/13 Pages) ON Semiconductor – Supervisory Circuits with I2C Serial CMOS EEPROM, Precision Reset Controller and Watchdog Timer (16K) | |||
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CAT1161, CAT1162
Supervisory Circuits with
I2C Serial CMOS EEPROM,
Precision Reset Controller
and Watchdog Timer (16K)
Description
The CAT1161/2 is a complete memory and supervisory solution for
microcontrollerâbased systems. A serial EEPROM memory (16K)
with hardware memory write protection, a system power supervisor
with brown out protection and a watchdog timer are integrated
together in low power CMOS technology. Memory interface is via an
I2C bus.
The 1.6âsecond watchdog circuit returns a system to a known good
state if a software or hardware glitch halts or âhangsâ the system. The
CAT1161 watchdog monitors the SDA line, making an additional PC
board trace unnecessary. The lower cost CAT1162 does not have a
watchdog timer.
The power supply monitor and reset circuit protects memory and
system controllers during power up/down and against brownout
conditions. Five reset threshold voltages support 5 V, 3.3 V and 3 V
systems. If power supply voltages are out of tolerance reset signals
become active, preventing the system microcontroller, ASIC or
peripherals from operating. Reset signals become inactive typically
200 ms after the supply voltage exceeds the reset threshold level. With
both active high and low reset signals, interface to microcontrollers
and other ICs is simple. In addition, a reset pin can be used as a
debounced input for pushbutton manual reset capability.
The CAT1161/2 memory features a 16âbyte page. In addition,
hardware data protection is provided by a write protect pin WP and by
a VCC sense circuit that prevents writes to memory whenever VCC falls
below the reset threshold or until VCC reaches the reset threshold
during power up.
Available packages include an 8âpin DIP and a surface mount,
8âpin SO package.
http://onsemi.com
PDIPâ8
CASE 646AA
SOICâ8
CASE 751BD
PIN CONFIGURATION
DC
RESET
WP
GND
1
8
2 CAT1161 7
3 CAT1162 6
4
5
VCC
RESET
SCL
SDA
PIN FUNCTIONS
Pin Name
DC
RESET
WP
GND
SDA
SCL
RESET
VCC
Function
Do Not Connect
Active Low Reset I/O
Write Protect
Ground
Serial Data/Address
Clock Input
Active High Reset I/O
Power Supply
Features
⢠Watchdog Monitors SDA Signal (CAT1161)
⢠400 kHz I2C Bus Compatible
⢠2.7 V to 6 V Operation
⢠Low Power CMOS Technology
⢠16âByte Page Write Buffer
⢠Builtâin Inadvertent Write Protection
⦠VCC Lock Out
⦠Write Protection Pin, WP
⢠Active High or Low Reset
⦠Precision Power Supply Voltage Monitor
⦠5 V, 3.3 V and 3 V Systems
⦠Five Threshold Voltage Options
ORDERING INFORMATION
For Ordering Information details, see page 11.
⢠1,000,000 Program/Erase Cycles
⢠Manual Reset
⢠100 Year Data Retention
⢠8âPin DIP or 8âPin SOIC
⢠Commercial and Industrial Temperature Ranges
⢠These Devices are PbâFree, Halogen Free/BFR Free
and are RoHS Compliant
© Semiconductor Components Industries, LLC, 2012
1
July, 2012 â Rev. 12
Publication Order Number:
CAT1161/D
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