CAT1161 Catalyst Semiconductor, CAT1161 Datasheet

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CAT1161

Manufacturer Part Number
CAT1161
Description
Supervisory Circuits with I2C Serial CMOS EEPROM/ Precision Reset Controller and Watchdog Timer
Manufacturer
Catalyst Semiconductor
Datasheet

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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 I
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.
The power supply monitor and reset circuit protects
memory and system controllers during power up/down
and against brownout conditions. Five reset threshold
PIN CONFIGURATION
CAT1161/2 (16K)
Supervisory Circuits with I
FEATURES
© 2002 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Part Dash
Number
400kHz I
2.7V to 6.0V operation
Low power CMOS technology
16-Byte page write buffer
Built-in inadvertent write protection
— V
— Write protect pin, WP
Watchdog monitors SDA signal (CAT1161)
RESET
2
-45
-42
-30
-28
-25
C bus.
GND
WP
CC
DC
lock out
DC = Do not connect
2
C bus compatible
Threshold
Minimum
CAT1161/2
4.50
4.25
3.00
2.85
2.55
Threshold
Maximum
2
V CC
RESET
SCL
SDA
C Serial CMOS EEPROM, Precision Reset Controller and Watchdog Timer
4.75
4.50
3.15
3.00
2.70
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 V
memory whenever V
until V
Available packages include an 8-pin DIP and a surface
mount, 8-pin SO package.
BLOCK DIAGRAM
CC
Active high or low reset
— Precision power supply voltage monitor
— 5V, 3.3V and 3V systems
— Five threshold voltage options
1,000,000 Program/Erase cycles
Manual Reset
100 Year data retention
8-pin DIP or 8-pin SOIC
Commercial and industrial temperature ranges
EXTERNAL LOAD
V CC
GND
SDA
WP
CAT1161
reaches the reset threshold during power up.
Only for
START/STOP
CC
CONTROL
WATCHDOG
LOGIC
WORD ADDRESS
LOGIC
RESET Controller
sense circuit that prevents writes to
BUFFERS
D OUT
ACK
CC
RESET RESET
Vcc Monitor
Precision
falls below the reset threshold or
XDEC
SHIFT REGISTERS
DATA IN STORAGE
TIMING CONTROL
STATE COUNTERS
SLAVE
ADDRESS
COMPARATORS
HIGH VOLTAGE/
SENSE AMPS
DECODERS
COLUMN
EEPROM
16K
Doc No. 3002, Rev. D
SCL

Related parts for CAT1161

CAT1161 Summary of contents

Page 1

... 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 sense circuit that prevents writes to ...

Page 2

... CAT1161/2 ABSOLUTE MAXIMUM RATINGS Temperature Under Bias ................. – +125 C Storage Temperature ....................... – +150 C Voltage on any Pin with (1) Respect to Ground ............ –2. with Respect to Ground ............... –2.0V to +7.0V CC Package Power Dissipation Capability ( ................................... 1.0W A Lead Soldering Temperature (10 secs) ............ 300 C (2) Output Short Circuit Current ........................ 100 mA Stresses above those listed under “ ...

Page 3

... 2. Min Max 100 200 3.5 4.7 4 4 300 4 100 Max Units Min Typ is stable until the specific operation can be initiated CAT1161/2 Units 4.5V - 5.5V CC Min Max Units 400 kHz 200 1.2 s 0.6 s 1.2 s 0 0.3 s 300 ns ...

Page 4

... Reset Output Low Voltage (I OLRS V Reset Output High Voltage OHRS Reset Threshold (V (CAT1161/2-45) Reset Threshold (V (CAT1161/2-42) Reset Threshold ( (CAT1161/2-30) Reset Threshold (V (CAT1161/2-28) Reset Threshold (V (CAT1161/2-25) t Power-Up Reset Timeout PURST twp Watchdog Period RESET Output Delay RPD TH V RESET Output Valid RVALID Doc ...

Page 5

... 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 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 seconds, the Watchdog Timer times out ...

Page 6

... Hardware Data Protection The CAT1161/2 is designed with the following hardware data protection features to provide a high degree of data integrity. (1) The CAT1161/2 features a WP pin. When the WP pin is tied high the entire memory array becomes write protected (read only). (2) The V sense provides write protection when V CC falls below the reset threshold value (VTH) ...

Page 7

... START or STOP condition. START Condition The START Condition precedes all commands to the device, and is defined as a HIGH to LOW transition of SDA when SCL is HIGH. The CAT1161/2 monitors the SDA and SCL lines and will not respond until this condition is met. Figure 5. Acknowledge Timing ...

Page 8

... While the cycle is in progress, the device will not respond to any request from the Master device. Page Write The CAT1161/2 writes bytes of data in a single write cycle, using the Page Write operation. The page write operation is initiated in the same manner as the byte ...

Page 9

... CAT1161/2 initiates the internal write cycle. ACK polling can be initiated immediately. This involves issuing the start condition followed by the slave address for a write operation. If the CAT1161/2 is still busy with the write operation, no ACK will be returned write operation has completed, an ACK will be returned and the host can then proceed with the next read or write operation ...

Page 10

... N+1. For all devices, N=E=2047. The counter will wrap around to Zero and continue to clock out valid data for the 16K devices. After the CAT1161/ 2 receives its slave address information (with the R/W bit set to one), it issues an acknowledge, then transmits the 8-bit byte requested ...

Page 11

... Suffix J I Temperature Range Blank = Commercial (0˚ to 70˚ Industrial (-40˚ to 85˚C) Package P: PDIP J: SOIC (JEDEC Memory, SOIC, Industrial Temperature, 3.0-3.15V Reset 11 CAT1161 DATA n -30 TE13 Tape & Reel TE13: 2000/Reel ...

Page 12

... Catalyst Semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Catalyst Semiconductor product could create a situation where personal injury or death may occur. ...

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