CAT1163PI-25TE13 Datasheet PDF - Catalyst Semiconductor
| Part Number | CAT1163PI-25TE13 | |
| Description | Supervisory Circuit with I2C Serial CMOS EEPROM/ Precision Reset Controller and Watchdog Timer | |
| Manufacturers | Catalyst Semiconductor | |
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CAT1163 (16K)
Supervisory Circuit with I2C Serial CMOS EEPROM, Precision Reset Controller and Watchdog Timer
FEATURES
s Watchdog timer input (WDI)
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 CAT1163 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.
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 debounced input for
push-button manual reset capability.
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 CAT1163 watchdog monitors
the WDI input pin.
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 5V, 3.3V and 3V systems. If power
The CAT1163 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.
Available packages include an 8-pin DIP and a surface
mount, 8-pin SO package.
PIN CONFIGURATION
WDI
RESET
WP
GND
CAT1163
VCC
RESET
SCL
SDA
Reset Threshold Voltage Options
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
START/STOP
LOGIC
XDEC
EEPROM
CONTROL
WP LOGIC
RESET Controller
Precision
WATCHDOG
Vcc Monitor
DATA IN STORAGE
HIGH VOLTAGE/
TIMING CONTROL
STATE COUNTERS
SLAVE
ADDRESS
COMPARATORS
SCL
WDI RESET RESET
Doc No. 3003, Rev. C
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PIN DESCRIPTIONS
WDI: WATCHDOG INPUT
If there is no transition on the WDI for more than 1.6
seconds, the watchdog timer times out.
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.
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
the device will initiate and maintain a reset condition.
The RESET pin must be connected through a pull-
down resistor and the RESET pin must be connected
through a pull-up resistor.
SDA: SERIAL DATA ADDRESS
The bidirectional serial data/address pin is used to
transfer all data into and out of the device. The SDA
pin is an open drain output and can be wire-ORed
with other open drain or open collector outputs.
SCL: SERIAL CLOCK
Serial clock input.
DEVICE OPERATION
Reset Controller Description
The CAT1163 precision RESET controller ensures
correct system operation during brownout and power
up/down conditions. It is configured with open drain
CAT1163
RESET outputs. During power-up, the RESET outputs 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 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 RESET pins are I/Os; therefore, the CAT1163 can act as
a signal conditioning circuit for an externally applied reset.
The inputs are edge triggered; that is, the RESET input in the
CAT1163 will initiate a reset timeout after detecting a low to
high transition and the RESET input in the CAT1163 will
initiate a reset timeout after detecting a high to low transition.
Watchdog Timer
The Watchdog Timer provides an independent protection for
microcontrollers. During a system failure, the CAT1163 will
respond with a reset signal after a time-out interval of 1.6
seconds for a lack of activity. The CAT1163 is designed with
a WDI input pin for the Watchdog Timer function. If the
microcontroller does not toggle the WDI input pin within 1.6
seconds, the Watchdog Timer times out. This will generate
a reset condition on reset outputs. The Watchdog Timer is
cleared by any transition on WDI.
As long as the reset signal is asserted, the Watchdog Timer
will not count and will stay cleared.
Figure 1. RESET Output Timing
t
GLITCH
VTH
VRVALID
VCC
tPURST
t RPD
tPURST
RESET
t RPD
RESET
5 Doc No. 3003, Rev. C
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for CAT1163PI-25TE13 electronic component. |
| Information | Total 12 Pages | |
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Featured Datasheets
| Part Number | Description | MFRS |
| CAT1163PI-25TE13 | The function is Supervisory Circuit with I2C Serial CMOS EEPROM/ Precision Reset Controller and Watchdog Timer. Catalyst Semiconductor | |
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