(Not recommended for new design,
replace with CAT25320)
E
CAT25C32/64
32K/64K-Bit SPI Serial CMOS EEPROM
TM
FEATURES
■ 1,000,000 program/erase cycles
■ 100 year data tetention
■ Self-timed write cycle
■ 10 MHz SPI compatible
■ 1.8 to 6.0 volt operation
■ Hardware and software protection
■ Low power CMOS technology
■ SPI modes (0,0 &1,1)
■ 8-pin DIP/SOIC, 14-pin TSSOP and 20-pin
TSSOP
■ 64-Byte page write buffer
■ Commercial, industrial and automotive
■ Block write protection
temperature ranges
– Protect 1/4, 1/2 or all of EEPROM array
DESCRIPTION
required to access the device. The HOLD pin may be
used to suspend any serial communication without
resetting the serial sequence. The CAT25C32/64 is
designed with software and hardware write protection
features including Block write protection. The device is
available in 8-pin DIP, 8-pin SOIC, 14-pin TSSOP and
20-pin TSSOP packages.
The CAT25C32/64 is a 32K/64K-Bit SPI Serial CMOS
EEPROM internally organized as 4Kx8/8Kx8 bits.
Catalyst’s advanced CMOS Technology substantially
reduces device power requirements. The CAT25C32/
64 features a 64-byte page write buffer. The device
operates via the SPI bus serial interface and is enabled
thoughaChipSelect(CS). InadditiontotheChipSelect,
the clock input (SCK), data in (SI) and data out (SO) are
PIN CONFIGURATION
DIP Package (P, L)
SOIC Package (S, V)
TSSOP Package (U14, Y14)
TSSOP Package (U20, Y20)
1
2
3
4
8
7
6
5
1
1
2
3
4
8
7
6
5
NC
VCC
HOLD
V
1
2
3
4
5
6
7
14
13
12
11
10
9
8
NC
CS
SO
SO
NC
NC
WP
SS
NC
NC
20
19
18
VCC
HOLD
NC
NC
NC
V
CS
SO
WP
CS
SO
NC
NC
NC
WP
CS
SO
CC
CC
2
HOLD
SCK
SI
HOLD
SCK
SI
3
WP
17 HOLD
NC
16
15 NC
14 SCK
13 SI
12 NC
11 NC
4
V
V
5
SS
SS
6
SCK
SI
V
7
SS
V
8
9
BLOCK DIAGRAM
10
SENSE AMPS
SHIFT REGISTERS
COLUMN
DECODERS
WORD ADDRESS
BUFFERS
PIN FUNCTIONS
Pin Name
Function
SO
SI
I/O
CONTROL
SO
Serial Data Output
Serial Clock
E2PROM
ARRAY
CS
SPI
CONTROL
LOGIC
XDEC
SCK
WP
VCC
VSS
CS
WP
HOLD
SCK
Write Protect
+1.8V to +6.0V Power Supply
Ground
BLOCK
PROTECT
LOGIC
DATA IN
STORAGE
Chip Select
SI
Serial Data Input
Suspends Serial Input
HIGH VOLTAGE/
TIMING CONTROL
HOLD
STATUS
NC
No Connect
REGISTER
© 2004 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc No. 1001, Rev. G