CAT1021, CAT1022, CAT1023
PIN CONFIGURATION
DIP Package (L)
SOIC Package (W)
TSSOP Package (Y)
MSOP Package (Z)
(Bottom View)
TDFN Package: 3 mm x 3 mm
0.8mm maximum height − (ZD4)
MR
V
8
7
6
5
1
2
3
4
CC
MR
RESET
WP
1
2
3
4
8
7
6
5
V
CC
RESET
WP
RESET
RESET
CAT1021
CAT1022
CAT1023
CAT1021
CAT1022
CAT1023
SCL
SDA
SCL
SDA
V
SS
V
SS
MR
V
CC
8
7
6
5
1
2
3
4
MR
RESET
NC
1
2
3
4
8
7
6
5
V
CC
RESET
NC
NC
NC
SCL
SDA
SCL
SDA
V
SS
V
SS
MR
RESET
RESET
1
2
3
4
8
7
6
5
V
CC
MR
V
CC
8
7
6
5
1
2
3
4
WDI
RESET
RESET
WDI
SCL
SDA
SCL
SDA
V
SS
V
SS
PIN DESCRIPTION
RESET/RESET: RESET OUTPUT
(RESET CAT1021/23 Only)
WDI (CAT1023 Only): WATCHDOG TIMER
INTERRUPT
These are open drain pins and RESET can 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.
Watchdog Timer Interrupt Input is used to reset the
watchdog timer. If a transition from high to low or low to
high does not occur every 1.6 seconds, the RESET outputs
will be driven active.
Table 2. PIN FUNCTION
SDA: SERIAL DATA ADDRESS
Pin Name
NC
Function
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.
No Connect
RESET
Active Low Reset Input/Output
Ground
V
SS
SCL: SERIAL CLOCK
Serial clock input.
SDA
SCL
Serial Data/Address
Clock Input
MR: MANUAL RESET INPUT
RESET
Active High Reset Output (CAT1021/23)
Power Supply
Manual Reset input is a debounced input that can be
connected to an external source for Manual Reset. Pulling
the MR input low will generate a Reset condition. Reset
outputs are active while MR input is low and for the reset
timeout period after MR returns to high. The input has an
internal pull up resistor.
V
CC
WP
MR
Write Protect (CAT1021 Only)
Manual Reset Input
WDI
Watchdog Timer Interrupt (CAT1023)
WP (CAT1021 Only): WRITE PROTECT INPUT
When WP input is tied to VSS or left unconnected write
operations to the entire array are allowed. When tied to VCC,
the entire array is protected. This input has an internal pull
down resistor.
Table 3. OPERATING TEMPERATURE RANGE
Industrial
Extended
−40°C to 85°C
−40°C to 125°C
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