CAT1022 CATALYST [Catalyst Semiconductor], CAT1022 Datasheet - Page 3

• Manufacturer Part Number: CAT1022
• Description: Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM, Manual Reset and Watchdog Timer
• Manufacturer: CATALYST [Catalyst Semiconductor]

For supervisory circuits with embedded 16k EEPROM, please refer to the CAT1161, CAT1162 and CAT1163
data sheets.
CAT102X FAMILY OVERVIEW
PIN FUNCTIONS
PIN DESCRIPTION
RESET/RESET
(RESET CAT1021/23 Only)
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.
SDA:
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 input.
C
C
C
C
C
C
C
Pin Name
D
A
A
A
A
A
A
A
RESET
RESET
e
T
T
T
T
T
T
T
SDA
SCL
WDI
V
V
v
WP
MR
NC
1
1
1
1
1
1
1
SS
CC
c i
0
0
0
0
0
0
0
2
2
2
2
2
e
2
2
RESET
RESET
RESET
RESET:
SERIAL DATA ADDRESS
SERIAL CLOCK
2
3
4
5
6
7
1
n I
M
R
p
Function
No Connect
Active Low Reset Input/Output
Ground
Serial Data/Address
Clock Input
Active High Reset Output (CAT1021/23)
Power Supply
Write Protect (CAT1021 only)
Manual Reset Input
Watchdog Timer Interrupt (CAT1023)
a
e
t u
n
s
u
t e
RESET OUTPUTS
P
l a
n i
W
a
c t
h
d
o
g
W
M
a
S
S
c t
o
W
W
P
n
D
D
n i
h
I D
I D
t i
A
A
d
r o
o
g
P
o r
W
3
e t
P
i r
n i
t c
e t
MR:
MR:
MR:
MR:
MR:
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.
WP (CAT1021 Only):
When WP input is tied to V
operations to the entire array are allowed. When tied to
V
internal pull down resistor.
WDI (CAT1023 Only):
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.
o i
CC
n
, the entire array is protected. This input has an
OPERATING TEMPERATURE RANGE
Industrial
Extended
V
n I
MANUAL RESET INPUT
l o
d
A
a t
e
u
g
p
x
e
e
l i
n
a i
S
d
y r
e
e
n
t n
CAT1021, CAT1022, CAT1023
s
e
WATCHDOG TIMER INTERRUPT
WRITE PROTECT INPUT
R
H
-40˚C to 85˚C
-40˚C to 125˚C
E
g i
SS
S
h
or left unconnected write
E
a
: T
n
d
A
t c
L
O
v i
W
e
Doc No. 3009, Rev. K
E
E
P
2
2
2
2
2
2
2
R
k
k
k
k
k
k
k
O
M