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PDF 25C256 Data sheet ( Hoja de datos )

Número de pieza 25C256
Descripción 128K/256K-Bit SPI Serial CMOS E2PROM
Fabricantes CatalystSemiconductor 
Logotipo CatalystSemiconductor Logotipo



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No Preview Available ! 25C256 Hoja de datos, Descripción, Manual

CAT25C128/256
128K/256K-Bit SPI Serial CMOS E2PROM
FEATURES
s 5 MHz SPI Compatible
s 1.8 to 6.0 Volt Operation
s Hardware and Software Protection
s Zero Standby Current
s Low Power CMOS Technology
s SPI Modes (0,0 &1,1)
s Commercial, Industrial and Automotive
Temperature Ranges
DESCRIPTION
s 100,000 Program/Erase Cycles
s 100 Year Data Retention
s Self-Timed Write Cycle
s 8-Pin DIP/SOIC, 16-Pin SOIC, 14-Pin TSSOP
and 20-Pin TSSOP
s 64-Byte Page Write Buffer
s Block Write Protection
– Protect 1/4, 1/2 or all of E2PROM Array
The CAT25C128/256 is a 128K/256K-Bit SPI Serial
CMOS E2PROM internally organized as 16Kx8/32Kx8
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
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.
PIN CONFIGURATION
SOIC Package (S, K) TSSOP Package (U14) DIP Package (P)
CS
SO
WP
VSS
1
2
3
4
8 VCC
7 HOLD
6 SCK
5 SI
SOIC Package (S16)
CS 1
SO 2
NC 3
NC 4
NC 5
WP 6
VSS 7
14 VCC
13 HOLD
12 NC
11 NC
10 NC
9 SCK
8 SI
CS
SO
WP
VSS
1
2
3
4
8 VCC
7 HOLD
6 SCK
5 SI
CS 1
SO 2
NC 3
NC 4
NC 5
NC 6
WP 7
VSS 8
16 VCC
15 HOLD
14 NC
13 NC
12 NC
11 NC
10 SCK
9 SI
PIN FUNCTIONS
TSSOP Package (U20)
NC 1
CS 2
SO 3
SO 4
NC 5
NC 6
WP 7
VSS 8
NC 9
NC 10
20 NC
19 VCC
18 HOLD
17 HOLD
16 NC
15 NC
14 SCK
13 SI
12 NC
11 NC
SO
SI
CS
WP
HOLD
SCK
Pin Name
SO
SCK
WP
VCC
VSS
CS
SI
HOLD
Function
Serial Data Output
Serial Clock
Write Protect
+1.8V to +6.0V Power Supply
Ground
Chip Select
Serial Data Input
Suspends Serial Input
BLOCK DIAGRAM
SENSE AMPS
SHIFT REGISTERS
WORD ADDRESS
BUFFERS
COLUMN
DECODERS
I/O
CONTROL
SPI
CONTROL
LOGIC
BLOCK
PROTECT
LOGIC
STATUS
REGISTER
XDEC
E2PROM
ARRAY
DATA IN
STORAGE
HIGH VOLTAGE/
TIMING CONTROL
25C128 F02
NC No Connect
Note: CAT25C256 not available in 8-Lead S or U packages.
© 2001 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 25088-00 1/01

1 page




25C256 pdf
CAT25C128/256
FUNCTIONAL DESCRIPTION
The CAT25C128/256 supports the SPI bus data trans-
mission protocol. The synchronous Serial Peripheral
Interface (SPI) helps the CAT25C128/256 to interface
directly with many of today’s popular microcontrollers.
The CAT25C128/256 contains an 8-bit instruction regis-
ter. (The instruction set and the operation codes are
detailed in the instruction set table)
After the device is selected with CS going low, the first
byte will be received. The part is accessed via the SI pin,
with data being clocked in on the rising edge of SCK.
The first byte contains one of the six op-codes that define
the operation to be performed.
PIN DESCRIPTION
SI: Serial Input
SI is the serial data input pin. This pin is used to input all
opcodes, byte addresses, and data to be written to the
25C128/256. Input data is latched on the rising edge of
the serial clock.
SO: Serial Output
SO is the serial data output pin. This pin is used to
transfer data out of the 25C128/256. During a read cycle,
data is shifted out on the falling edge of the serial clock.
SCK: Serial Clock
SCK is the serial clock pin. This pin is used to synchro-
nize the communication between the microcontroller
and the 25C128/256. Opcodes, byte addresses, or data
present on the SI pin are latched on the rising edge of the
SCK. Data on the SO pin is updated on the falling edge
of the SCK.
INSTRUCTION SET
Instruction
WREN
WRDI
RDSR
WRSR
READ
WRITE
Opcode
0000 0110
0000 0100
0000 0101
0000 0001
0000 0011
0000 0010
CS: Chip Select
CS is the Chip select pin. CS low enables the CAT25C128/
256 and CS high disables the CAT25C128/256. CS high
takes the SO output pin to high impedance and forces
the device into a Standby Mode (unless an internal write
operation is underway) The CAT25C128/256 draws
ZERO current in the Standby mode. A high to low
transition on CS is required prior to any sequence being
initiated. A low to high transition on CS after a valid write
sequence is what initiates an internal write cycle.
WP: Write Protect
WP is the Write Protect pin. The Write Protect pin will
allow normal read/write operations when held high.
When WP is tied low and the WPEN bit in the status
register is set to “1”, all write operations to the status
register are inhibited. WP going low while CS is still low
will interrupt a write to the status register. If the internal
write cycle has already been initiated, WP going low will
have no effect on any write operation to the status
register. The WP pin function is blocked when the WPEN
bit is set to 0.
HOLD: Hold
HOLD is the HOLD pin. The HOLD pin is used to pause
transmission to the CAT25C128/256 while in the middle
of a serial sequence without having to re-transmit entire
sequence at a later time. To pause, HOLD must be
brought low while SCK is low. The SO pin is in a high
impedance state during the time the part is paused, and
transitions on the SI pins will be ignored. To resume
communication, HOLD is brought high, while SCK is low.
(HOLD should be held high any time this function is not
being used.) HOLD may be tied high directly to Vcc or tied
to Vcc through a resistor. Figure 9 illustrates hold timing
sequence.
Operation
Enable Write Operations
Disable Write Operations
Read Status Register
Write Status Register
Read Data from Memory
Write Data to Memory
5 Doc. No. 25088-00 1/01

5 Page





25C256 arduino
CAT25C128/256
ORDERING INFORMATION
Prefix Device #
CAT 25C256
Optional
Company ID
Product
Number
25C128: 128K
25C256: 256K
Suffix
K
I
- 1.8 TE13
Temperature Range
Blank = Commercial (0˚C to +70˚C)
I = Industrial (-40˚C to +85˚C)
A = Automotive (-40˚ to +105˚C)*
Tape & Reel
TE13: 2000/Reel
Package
P = 8-Pin PDIP
S = 8-Pin SOIC (JEDEC)
S16 = 16-Pin SOIC (JEDEC)
K = 8-Pin SOIC (EIAJ)
U14 = 14-Pin TSSOP
U20 = 20-Pin TSSOP
* -40˚C to +125˚C is available upon request
Operating Voltage
Blank (Vcc=2.5 to 6.0V)
1.8 (Vcc=1.8 to 6.0V)
Notes:
(1) The device used in the above example is a 25C256KI-1.8TE13 (SOIC, Industrial Temperature, 1.8 Volt to 6 Volt Operating
Voltage, Tape & Reel)
11 Doc. No. 25088-00 1/01

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