CAT1640 Datasheet, PDF (2/18 Pages) Catalyst Semiconductor – Supervisory Circuits with I2C Serial 64K CMOS EEPROM

CAT1640, CAT1641
BLOCK DIAGRAM — CAT1640, CAT1641
EXTERNAL LOAD
VCC
VSS
DOUT
ACK
WORD ADDRESS
BUFFERS
SENSE AMPS
SHIFT REGISTERS
COLUMN
DECODERS
SDA
START/STOP
LOGIC
CONTROL
LOGIC
XDEC
64kbit
EEPROM
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
OPERATING TEMPERATURE RANGE
Industrial
-40˚C to 85˚C
RESET Controller
Precision
Vcc Monitor
DATA IN STORAGE
HIGH VOLTAGE/
TIMING CONTROL
STATE COUNTERS
SCL
SLAVE
A0
ADDRESS
A1
COMPARATORS
A2
RESET (CAT1640)
RESET (CAT1641)
PIN FUNCTIONS
Pin Name
RESET
VSS
SDA
SCL
RESET
VCC
Function
Active Low Reset Input/Output (CAT1640)
Ground
Serial Data/Address
Clock Input
Active High Reset Output (CAT1641)
Power Supply
PIN DESCRIPTION
RESET/RESET: RESET OUTPUTS
These are open-drain pins and RESET can also be used
as a manual reset trigger input. By forcing a reset condition
on the pin 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 trans-
fer 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.
A0, A1, A2: DEVICE ADDRESS INPUTS
When hardwired, up to eight CAT1640/41 devices may
be addressed on a single bus system (refer to Device
Addressing). When the pins are left unconnected, the
default values are zeros.
Doc. No. MD-3012, Rev. D
2
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice.