Datasheet > 存储 > SRAM> CY7C025-35JI

CY7C025-35JI

更新时间： 2024-11-07 00:01:31

品牌	Logo	应用领域
赛普拉斯 - CYPRESS		/
页数	文件大小	规格书
21页	503K
描述
4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY

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数据手册

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CY7C025-35JI 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

Features

Functional Description

• True Dual-Ported memory cells which allow

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

simultaneous 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

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

ious arbitration schemes are included on the CY7C024/0241

and CY7C025/0251 to handle situations when multiple pro-

cessors access the same piece of data. Two ports are provid-

ed, 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 du-

al-port static RAMs or multiple devices can be combined in

order to function as a 32-/36-bit or wider master/slave du-

al-port static RAM. An M/S pin is provided for implementing

32-/36-bit or wider memory applications without the need for

separate master and slave devices or additional discrete logic.

Application areas include interprocessor/multiprocessor de-

signs, communications status buffering, and dual-port vid-

eo/graphics memory.

• 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

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 be-

tween 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 sidecan 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 indepen-

dently on each port by a chip select (CE) pin.

• INT flag for port-to-port communication

• Separate upper-byte and lower-byte control

• Pin select for Master or Slave

• Available in 84-pin PLCC and 100-pin TQFP

The CY7C024/0241 and CY7C025/0251 are available in

84-pin PLCCs (CY7C024 and CY7C025 only) and 100-pin

Thin Quad Plastic Flatpack (TQFP).

Logic Block Diagram

R/W

[3]

15L

[3]

[2]

–

I/O –I/O

I/O

15R

I/O

CONTROL

I/O

CONTROL

[2]

I/O –I/O

I/O

[1]

BUSY

(CY7C025/0251)

12R

(CY7C025/0251)

12L

MEMORY

ARRAY

11L

ADDRESS

DECODER

ADDRESS

DECODER

11R

INTERRUPT

SEMAPHORE

ARBITRATION

R/W

SEM

7C024–1

INT

M/S

INT

Cypress Semiconductor Corporation

Document #: 38-06035 Rev. *B

•

3901 North First Street

•

San Jose

•

CA 95134

•

408-943-2600

Revised June 22, 2004

12 3 4 5 6 7...21

中文翻译

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与CY7C025-35JI相关器件

型号	品牌	获取价格	描述	数据表
CY7C025-35JIR	CYPRESS	获取价格	Multi-Port SRAM, 8KX16, 35ns, CMOS, PQCC84, PLASTIC, LCC-84
CY7C025-35JIT	CYPRESS	获取价格	Dual-Port SRAM, 8KX16, 35ns, CMOS, PQCC84, PLASTIC, LCC-84
CY7C025-35JXC	CYPRESS	获取价格	4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY
CY7C025-35JXI	CYPRESS	获取价格	4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY
CY7C025-55AC	CYPRESS	获取价格	4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY
CY7C025-55AC	ROCHESTER	获取价格	8KX16 DUAL-PORT SRAM, 55ns, PQFP100, PLASTIC, TQFP-100
CY7C025-55AI	ROCHESTER	获取价格	8KX16 DUAL-PORT SRAM, 55ns, PQFP100, PLASTIC, TQFP-100
CY7C025-55AI	CYPRESS	获取价格	4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY
CY7C025-55AXC	CYPRESS	获取价格	4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY
CY7C025-55AXI	CYPRESS	获取价格	4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY

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