Datasheet > 存储 > SRAM> CY7C0251-25AXI

CY7C0251-25AXI

更新时间： 2024-09-18 04:53:27

品牌	Logo	应用领域
赛普拉斯 - CYPRESS		/
页数	文件大小	规格书
21页	524K
描述
4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY

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CY7C0251-25AXI 数据手册

CY7C024/0241

CY7C025/0251

4K x 16/18 and 8K x 16/18 Dual-Port

Static RAM with SEM, INT, BUSY

Functional Description

Features

• True Dual-Ported memory cells which allow simulta-

The CY7C024/0241 and CY7C025/0251 are low-power

CMOS 4K x 16/18 and 8K x 16/18 dual-port static RAMs.

Various arbitration schemes are included on the CY7C024/

0241 and CY7C025/0251 to handle situations when multiple

processors access the same piece of data. Two ports are

provided, permitting independent, asynchronous access for

reads and writes to any location in memory. The CY7C024/

0241 and CY7C025/0251 can be utilized as standalone

16-/18-bit dual-port static RAMs or multiple devices can be

combined in order to function as a 32-/36-bit or wider master/

slave dual-port static RAM. An M/S pin is provided for imple-

menting 32-/36-bit or wider memory applications without the

need for separate master and slave devices or additional

discrete logic. Application areas include interprocessor/multi-

processor designs, communications status buffering, and

dual-port video/graphics memory.

Each port has independent control pins: Chip Enable (CE),

Read or Write Enable (R/W), and Output Enable (OE). Two

flags are provided on each port (BUSY and INT). BUSY

signals that the port is trying to access the same location

currently being accessed by the other port. The Interrupt Flag

(INT) permits communication between ports or systems by

means of a mail box. The semaphores are used to pass a flag,

or token, from one port to the other to indicate that a shared

resource is in use. The semaphore logic is comprised of eight

shared latches. Only one side can control the latch

(semaphore) at any time. Control of a semaphore indicates

that a shared resource is in use. An automatic power-down

feature is controlled independently on each port by a chip

select (CE) pin.

neous reads of the same memory location

• 4K x 16 organization (CY7C024)

• 4K x 18 organization (CY7C0241)

• 8K x 16 organization (CY7C025)

• 8K x 18 organization (CY7C0251)

• 0.65-micron CMOS for optimum speed/power

• High-speed access: 15 ns

• Low operating power: I_CC= 150 mA (typ.)

• Fully asynchronous operation

• Automatic power-down

• Expandable data bus to 32/36 bits or more using

Master/Slave chip select when using more than one

device

• On-chip arbitration logic

• Semaphores included to permit software handshaking

between ports

• INT flag for port-to-port communication

• Separate upper-byte and lower-byte control

• Pin select for Master or Slave

• Available in 84-pin Lead (Pb)-free PLCC, 84-pin PLCC,

100-pin Lead (Pb)-free TQFP, and 100-pin TQFP

The CY7C024/0241 and CY7C025/0251 are available in

84-pin Lead (Pb)-free PLCCs, 84-pin PLCCs (CY7C024 and

CY7C025 only), 100-pin Lead (Pb)-free Thin Quad Plastic

Flatplack (TQFP) and 100-pin Thin Quad Plastic Flatpack.

Cypress Semiconductor Corporation

•

3901 North First Street

•

San Jose, CA 95134

•

408-943-2600

Document #: 38-06035 Rev. *C

Revised November 11, 2004

12 3 4 5 6 7...21

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与CY7C0251-25AXI相关器件

型号	品牌	获取价格	描述	数据表
CY7C0251-35AC	CYPRESS	获取价格	4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY
CY7C0251-35AI	CYPRESS	获取价格	4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY
CY7C0251-35AXC	CYPRESS	获取价格	4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY
CY7C0251-35AXI	CYPRESS	获取价格	4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY
CY7C0251-55AC	CYPRESS	获取价格	4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY
CY7C0251-55AI	CYPRESS	获取价格	4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY
CY7C0251-55AXC	CYPRESS	获取价格	4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY
CY7C0251-55AXI	CYPRESS	获取价格	4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY
CY7C025-15AC	CYPRESS	获取价格	4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY
CY7C025-15ACT	ROCHESTER	获取价格	8KX16 DUAL-PORT SRAM, 15ns, PQFP100, PLASTIC, TQFP-100

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