CAT25C33/65
32K/64K-Bit SPI Serial CMOS EEPROM
FEATURES
■ 1,000,000 program/erase cycles
■ 100 year data tetention
■ 10 MHz SPI compatible
■ 1.8 to 6.0 volt operation
■ Self-timed write cycle
■ Hardware and software protection
■ Low power CMOS technology
■ SPI modes (0,0 &1,1)
■ 8-pin DIP/SOIC and 14-pin TSSOP
■ 64-byte page write buffer
■ Block write protection
■ Commercial, industrial, automotive and extended
– Protect first page, last page, any 1/4 or lower
1/2 of EEPROM array
temperature ranges
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 CAT25C33/65 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 CAT25C33/
65 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
BLOCK DIAGRAM
SOIC Package (S, V, GV) TSSOP Package (U14, Y14)
14
13
12
11
10
9
8
1
2
3
4
5
6
7
VCC
HOLD
NC
NC
NC
CS
SO
NC
NC
NC
WP
1
2
3
4
8
7
6
5
V
CS
SO
WP
CC
SENSE AMPS
SHIFT REGISTERS
HOLD
SCK
SI
V
SS
SCK
SI
COLUMN
DECODERS
WORD ADDRESS
BUFFERS
V
SS
DIP Package (P, L, GL)
1
2
3
4
8
7
6
5
V
SO
SI
CS
SO
CC
I/O
CONTROL
HOLD
SCK
SI
E2PROM
ARRAY
WP
CS
SPI
CONTROL
LOGIC
XDEC
V
SS
WP
HOLD
SCK
PIN FUNCTIONS
Pin Name
BLOCK
PROTECT
LOGIC
Function
SO
Serial Data Output
DATA IN
STORAGE
SCK
WP
VCC
VSS
CS
Serial Clock
Write Protect
HIGH VOLTAGE/
TIMING CONTROL
+1.8V to +6.0V Power Supply
Ground
STATUS
REGISTER
Chip Select
SI
Serial Data Input
Suspends Serial Input
HOLD
NC
No Connect
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc. No. 1000, Rev. H
1