Advance Information
CAT25C64/128
64K/128K-Bit SPI Serial CMOS E2PROM
FEATURES
■ 1,000,000 Program/Erase Cycles
■ 100 Year Data Retention
■ 5 MHz SPI Compatible
■ 1.8 to 6.0 Volt Operation
■ Hardware and Software Protection
■ Zero Standby Current
■ Self-Timed Write Cycle
■ 8-Pin DIP/SOIC, 16-Pin SOIC and 20-Pin TSSOP
■ 64-Byte Page Write Buffer
■ Low Power CMOS Technology
■ SPI Modes (0,0)
■ Block Write Protection
– Protect 1/4, 1/2 or all of E2PROM Array
■ Commercial, Industrial and Automotive
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 CAT25C64/128 is
designed with software and hardware write protection
features including Block write protection. The device is
available in 8-pin DIP, 8-pin SOIC, 16-pin SOIC and 20-
pin TSSOP packages.
TheCAT25C64/128isa64K/128K-BitSPISerialCMOS
E2PROM internally organized as 8Kx8/16Kx8 bits.
Catalyst’s advanced CMOS Technology substantially
reduces device power requirements. The CAT25C64/
128 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)
SOIC Package (S16)
TSSOP Package (U20)
1
2
3
4
8
7
6
5
V
CS
SO
WP
CC
16
1
2
3
4
5
6
7
8
VCC
HOLD
NC
1
NC
NC
CS
SO
SO
NC
NC
WP
SS
NC
NC
20
19
18
17
16
15
CS
SO
HOLD
SCK
SI
VCC
HOLD
HOLD
NC
2
15
14
13
12
11
10
9
3
NC
NC
NC
NC
WP
VSS
V
4
SS
SENSE AMPS
SHIFT REGISTERS
NC
5
6
NC
NC
7
14 SCK
13 SI
12 NC
11 NC
DIP Package (P)
NC
V
8
SCK
SI
9
1
2
3
4
8
7
6
5
COLUMN
DECODERS
V
WORD ADDRESS
BUFFERS
CS
SO
CC
10
HOLD
SCK
SI
WP
V
SS
SO
SI
I/O
CONTROL
PIN FUNCTIONS
Pin Name
E2PROM
ARRAY
CS
Function
SPI
XDEC
WP
CONTROL
LOGIC
SO
Serial Data Output
Serial Clock
HOLD
SCK
SCK
WP
VCC
VSS
CS
BLOCK
PROTECT
LOGIC
Write Protect
+1.8V to +6.0V Power Supply
Ground
DATA IN
STORAGE
Chip Select
SI
Serial Data Input
Suspends Serial Input
HIGH VOLTAGE/
TIMING CONTROL
HOLD
STATUS
REGISTER
NC
No Connect
25C128 F02
© 1999 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc No. 25069-00 6/99 SPI-1
1