Advanced
CAT25CXXX
Supervisory Circuits with SPI Serial E2PROM, Precision Reset Controller and Watchdog Timer
FEATURES
■ Watchdog Timer on CS
■ 10 MHz SPI Compatible
■ 1,000,000 Program/Erase Cycles
■ 1.8 to 6.0 Volt Operation
■ 100 Year Data Retention
■ Hardware and Software Protection
■ Self-Timed Write Cycle
■ Zero Standby Current
■ 8-Pin DIP/SOIC, 16-Pin SOIC and 14-Pin TSSOP
■ Low Power CMOS Technology
■ Page Write Buffer
■ SPI Modes (0,0 &1,1)
■ Block Write Protection
■ Commercial, Industrial and Automotive
– Protect 1/4, 1/2 or all of E2PROM Array
Temperature Ranges
■ Programmable Watchdog Timer
■ Active High or Low Reset Outputs
■ Built-in inadvertent Write Protection
– Precision Power Supply Voltage Monitoring
– 5V, 3.3V, 3V and 1.8V Options
– VCC Lock Out
DESCRIPTION
The CAT25CXXX is a single chip solution to three
popular functions of EEPROM Memory, precision reset
controllerandwatchdogtimer.TheEEPROMMemoryis
a 2K/4K/8K/16K/32K-Bit SPI Serial CMOS E2PROM
internally organized as 256x8/512x8/1024x8/2048x8/
4096x8 bits. Catalyst’s advanced CMOS Technology
substantially reduces device power requirements. The
2K/4K devices feature a 16-byte page write buffer. The
8K/16K/32K devices feature a 32-byte page write
buffer.The device operates via the SPI bus serial inter-
face and is enabled though a Chip Select (CS). In
addition to the Chip Select, the clock input (SCK), data
in (SI) and data out (SO) are required to access the
device. The reset function of the 25CXXX protects the
system during brown out and power up/down condtions.
During system failure the watchdog timer feature pro-
tects the microcontroller with a reset signal. The
CAT25CXXX is designed with software and hardware
write protection features including Block Lock protec-
tion.Thedeviceisavailablein8-pinDIP,8-pinSOIC,16-
pin SOIC and 14-pin TSSOP packages.
PIN CONFIGURATION
DIP Package (P)
SOIC Package (S16)
TSSOP Package (U14)
SOIC Package (S)
16
1
2
3
4
5
6
7
8
VCC
CS
SO
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
14
13
12
11
10
9
8
1
2
3
4
5
6
7
VCC
RESET/RESET
NC
NC
NC
SCK
SI
V
V
CC
RESET/RESET
CS
SO
NC
NC
NC
WP
CS
SO
WP
CS
SO
CC
RESET/RESET
15
14
13
12
11
10
9
RESET/RESET
NC
NC
NC
NC
WP
VSS
NC
NC
NC
NC
SCK
SI
WP
SCK
SI
SCK
SI
V
SS
V
SS
V
SS
© 1998 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
9-95