25C256 CatalystSemiconductor, 25C256 Datasheet
25C256
Manufacturer Part Number
25C256
Description
128K/256K-BitSPISerialCMOSE2PROM
Manufacturer
CatalystSemiconductor
Datasheet
1.25C256.pdf
(11 pages)
FEATURES
DESCRIPTION
The CAT25C128/256 is a 128K/256K-Bit SPI Serial
CMOS E
bits. Catalyst’s advanced CMOS Technology substan-
tially reduces device power requirements. The
CAT25C128/256 features a 64-byte page write buffer.
The device operates via the SPI bus serial interface and
is enabled though a Chip Select (CS). In addition to the
Chip Select, the clock input (SCK), data in (SI) and data
PIN FUNCTIONS
V SS
SOIC Package (S16)
PIN CONFIGURATION
© 2001 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT25C128/256
128K/256K-Bit SPI Serial CMOS E
SOIC Package (S, K)
WP
CS
SO
WP
V
CS
SO
NC
NC
NC
NC
SS
1.8 to 6.0 Volt Operation
Hardware and Software Protection
Zero Standby Current
Low Power CMOS Technology
SPI Modes (0,0 &1,1)
Commercial, Industrial and Automotive
Temperature Ranges
5 MHz SPI Compatible
Pin Name
SO
SCK
WP
V
V
CS
SI
HOLD
NC
CC
SS
1
2
3
4
1
2
3
4
5
6
7
8
2
PROM internally organized as 16Kx8/32Kx8
16
15
14
13
12
11
10
8
7
6
5
9
V CC
HOLD
SCK
SI
VCC
HOLD
NC
NC
NC
NC
SCK
SI
Serial Data Output
Serial Clock
Write Protect
+1.8V to +6.0V Power Supply
Ground
Chip Select
Serial Data Input
Suspends Serial Input
No Connect
TSSOP Package (U14)
TSSOP Package (U20)
V
WP
V
WP
CS
CS
SO
NC
NC
NC
NC
SO
SO
NC
NC
NC
NC
SS
SS
Function
1
3
4
1
3
4
10
2
5
6
7
2
5
6
7
8
9
14
13
12
11
10
20
19
18
16
15
14
12
17
13
11
9
8
VCC
HOLD
NC
NC
NC
SCK
SI
NC
VCC
HOLD
HOLD
NC
SCK
NC
NC
SI
NC
2
PROM
V SS
CS
SO
WP
DIP Package (P)
1
2
3
4
1
out (SO) are required to access the device. The HOLD
pin may be used to suspend any serial communication
without resetting the serial sequence. The CAT25C128/
256 is designed with software and hardware write pro-
tection features including Block Lock protection. The
device is available in 8-pin DIP, 8-pin SOIC, 16-pin
SOIC, 14-pin TSSOP and 20-pin TSSOP packages.
Note: CAT25C256 not available in 8-Lead S or U packages.
8
7
6
5
100,000 Program/Erase Cycles
100 Year Data Retention
Self-Timed Write Cycle
8-Pin DIP/SOIC, 16-Pin SOIC, 14-Pin TSSOP
and 20-Pin TSSOP
64-Byte Page Write Buffer
Block Write Protection
– Protect 1/4, 1/2 or all of E
V CC
HOLD
SCK
SI
HOLD
SCK
SO
WP
CS
SI
BLOCK DIAGRAM
REGISTER
CONTROL
PROTECT
CONTROL
STATUS
BLOCK
LOGIC
LOGIC
WORD ADDRESS
I/O
SPI
BUFFERS
2
PROM Array
XDEC
SHIFT REGISTERS
Doc. No. 25088-00 1/01
TIMING CONTROL
HIGH VOLTAGE/
SENSE AMPS
DECODERS
STORAGE
COLUMN
E
DATA IN
ARRAY
2
PROM
25C128 F02
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