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參數(shù)資料
| 型號： | CAT25C256P-1.8TE13 |
| 元件分類： | EEPROM |
| 英文描述： | 64K 8K x 8 Battery-Voltage CMOS E2PROM |
| 中文描述： | 64K的8K的× 8電池電壓的CMOS E2PROM的 |
| 文件頁數(shù)： | 5/11頁 |
| 文件大?。?/td> | 79K |
| 代理商： | CAT25C256P-1.8TE13 |
5
CAT25C128/256
Doc. No. 25088-00 1/01
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.
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 V
cc
or tied
to V
cc
through a resistor. Figure 9 illustrates hold timing
sequence.
Instruction
Opcode
Operation
WREN
0000 0110
Enable Write Operations
WRDI
0000 0100
Disable Write Operations
RDSR
0000 0101
Read Status Register
WRSR
0000 0001
Write Status Register
READ
0000 0011
Read Data from Memory
WRITE
0000 0010
Write Data to Memory
INSTRUCTION SET
相關(guān)PDF資料 |
PDF描述 |
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| CAT25C256PA-1.8TE13 | 64K 8K x 8 Battery-Voltage CMOS E2PROM |
| CAT25C256PA-TE13 | 64K 8K x 8 Battery-Voltage CMOS E2PROM |
| CAT25C256PI-1.8TE13 | 64K 8K x 8 Battery-Voltage CMOS E2PROM |
| CAT25C256PI-TE13 | 64K 8K x 8 Battery-Voltage CMOS E2PROM |
| CAT25C256P-TE13 | 64K 8K x 8 Battery-Voltage CMOS E2PROM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CAT25C256PA | 功能描述:電可擦除可編程只讀存儲器 (32kx8) 256K RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| CAT25C256PI | 功能描述:電可擦除可編程只讀存儲器 (32kx8) 256K RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| CAT25C256PI-1.8 | 功能描述:電可擦除可編程只讀存儲器 (32kx8) 256K RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| CAT25C256X | 功能描述:電可擦除可編程只讀存儲器 (32kx8) 256K RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| CAT25C256X-1.8 | 功能描述:電可擦除可編程只讀存儲器 (32kx8) 256K RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
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