CAT1320, CAT1321
Advance Information
Threshold Voltage Options
BLOCK DIAGRAM — CAT1320, CAT1321
EXTERNAL LOAD
Part Dash Minimum Maximum
Number Threshold Threshold
SENSE AMPS
SHIFT REGISTERS
D
OUT
ACK
-45
-42
-30
-28
-25
4.50
4.25
3.00
2.85
2.55
4.75
4.50
3.15
3.00
2.70
V
V
CC
SS
WORD ADDRESS
BUFFERS
COLUMN
DECODERS
START/STOP
SDA
LOGIC
32kbit
EEPROM
XDEC
OPERATING TEMPERATURE RANGE
CONTROL
LOGIC
Industrial
-40˚C to 85˚C
DATA IN STORAGE
HIGH VOLTAGE/
TIMING CONTROL
RESET Controller
STATE COUNTERS
SCL
Precision
A0
A1
A2
SLAVE
ADDRESS
COMPARATORS
Vcc Monitor
RESET (CAT1320)
RESET (CAT1321)
PIN FUNCTIONS
Pin Name
RESET
VSS
Function
Active Low Reset Input/Output (CAT1320)
Ground
SDA
Serial Data/Address
Clock Input
SCL
RESET
VCC
Active High Reset Output (CAT1321)
Power Supply
PIN DESCRIPTION
RESET/RESET: RESET OUTPUTS
SCL: SERIAL CLOCK
These are open-drain pins and RESET can also be used Serial clock input.
asamanualresettriggerinput.Byforcingaresetcondition
on the pin the device will initiate and maintain a reset
condition. The RESET pin must be connected through a
pull-downresistorandtheRESETpinmustbeconnected
through a pull-up resistor.
A0, A1, A2:
DEVICE ADDRESS INPUTS
When hardwired, up to eight CAT1320/21 devices may
be addressed on a single bus system (refer to Device
Addressing). When the pins are left unconnected, the
default values are zeros.
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.
Doc. No. 25085, Rev. 00
2
CATALYST [ CATALYST SEMICONDUCTOR ]
