CAT1161PI-42TE13 Datasheet PDF - Catalyst Semiconductor
| Part Number | CAT1161PI-42TE13 | |
| Description | Supervisory Circuits with I2C Serial CMOS EEPROM/ Precision Reset Controller and Watchdog Timer | |
| Manufacturers | Catalyst Semiconductor | |
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There is a preview and CAT1161PI-42TE13 download ( pdf file ) link at the bottom of this page. Total 12 Pages | ||
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CAT1161/2 (16K)
Supervisory Circuits with I2C Serial CMOS EEPROM, Precision Reset Controller and Watchdog Timer
FEATURES
s Watchdog monitors SDA signal (CAT1161)
s 400kHz I2C bus compatible
s 2.7V to 6.0V operation
s Low power CMOS technology
s 16-Byte page write buffer
s Built-in inadvertent write protection
— V lock out
CC
— Write protect pin, WP
s Active high or low reset
— Precision power supply voltage monitor
— 5V, 3.3V and 3V systems
— Five threshold voltage options
s 1,000,000 Program/Erase cycles
s Manual Reset
s 100 Year data retention
s 8-pin DIP or 8-pin SOIC
s Commercial and industrial temperature ranges
DESCRIPTION
The CAT1161/2 is a complete memory and supervisory
solution for microcontroller-based 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 1.6-second watchdog circuit returns a system to a
known good state if a software or hardware glitch halts
or “hangs” 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.
voltages support 5V, 3.3V and 3V 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 push-button
manual reset capability.
The CAT1161/2 memory features a 16-byte 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.
The power supply monitor and reset circuit protects Available packages include an 8-pin DIP and a surface
memory and system controllers during power up/down mount, 8-pin SO package.
and against brownout conditions. Five reset threshold
PIN CONFIGURATION
DC
RESET
WP
GND
CAT1161/2
VCC
RESET
SCL
SDA
DC = Do not connect
Part Dash Minimum Maximum
Number Threshold Threshold
-45 4.50 4.75
-42 4.25 4.50
-30 3.00 3.15
-28 2.85 3.00
-25 2.55 2.70
© 2002 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
BLOCK DIAGRAM
EXTERNAL LOAD
VCC
GND
DOUT
ACK
WORD ADDRESS
BUFFERS
SENSE AMPS
SHIFT REGISTERS
COLUMN
DECODERS
SDA
WP
START/STOP
LOGIC
CONTROL
LOGIC
XDEC
16K
EEPROM
Only for
CAT1161
RESET Controller
Precision
WATCHDOG
Vcc Monitor
DATA IN STORAGE
HIGH VOLTAGE/
TIMING CONTROL
STATE COUNTERS
SLAVE
ADDRESS
COMPARATORS
SCL
RESET RESET
Doc No. 3002, Rev. D
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CAT1161/2
PIN DESCRIPTIONS
WP: WRITE PROTECT
If the pin is tied to VCC the entire memory array
becomes Write Protected (READ only). When the pin
is tied to GND or left floating normal read/write
operations are allowed to the device.
remain active until VCC reaches the VTH threshold and will
continue driving the outputs for approximately 200ms (tPURST)
after reaching VTH. After the tPURST timeout interval, the
device will cease to drive the reset outputs. At this point the
reset outputs will be pulled up or down by their respective pull
RESET/RESET: RESET I/O
These are open drain pins and can be used as reset
trigger inputs. By forcing a reset condition on the pins
up/down resistors. During power-down, the RESET outputs
will be active when VCC falls below VTH. The RESET outputs
will be valid so long as VCC is >1.0V (VRVALID).
the device will initiate and maintain a reset condition. The RESET pins are I/Os; therefore, the CAT1161/2 can act
The RESET pin must be connected through a pull- as a signal conditioning circuit for an externally applied
down resistor, and the RESET pin must be connected manual reset. The inputs are edge triggered; that is, the
through a pull-up resistor.
RESET input in the CAT1161/2 will initiate a reset timeout
SDA: SERIAL DATA ADDRESS
The bidirectional serial data/address pin is used to
transfer all data into and out of the device. The SDA
after detecting a low to high transition and the RESET input
will initiate a reset timeout after detecting a high to low
transition.
pin is an open drain output and can be wire-ORed
with other open drain or open collector outputs.
Watchdog Timer
If there is no transition on the SDA for more than 1.6
seconds, the watchdog timer times out.
The Watchdog Timer provides an independent protection for
microcontrollers. During a system failure, the CAT1161will
respond with a reset signal after a time-out interval of 1.6
SCL: SERIAL CLOCK
Serial clock input.
seconds for a lack of activity. The CAT1161 is designed with
the Watchdog Timer feature on the SDA input. If the
microcontroller does not toggle the SDA input pin within 1.6
DEVICE OPERATION
seconds, the Watchdog Timer times out. This will generate
a reset condition on reset outputs. The Watchdog Timer is
Reset Controller Description
cleared by any transition on SDA.
As long as the reset signal is asserted, the Watchdog Timer
The CAT1161/2 precision RESET controller ensures will not count and will stay cleared.
correct system operation during brownout and power
up/down conditions. It is configured with open drain The CAT1162 does not have a Watchdog.
RESET outputs. During power-up, the RESET outputs
Figure 1. RESET Output Timing
t
GLITCH
VTH
VRVALID
VCC
tPURST
t RPD
tPURST
RESET
t RPD
RESET
5 Doc No. 3002, Rev. D
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for CAT1161PI-42TE13 electronic component. |
| Information | Total 12 Pages | |
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| Part Number | Description | MFRS |
| CAT1161PI-42TE13 | The function is Supervisory Circuits with I2C Serial CMOS EEPROM/ Precision Reset Controller and Watchdog Timer. Catalyst Semiconductor | |
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