Datasheet > 存储 > FIFO> SN74ACT7805

SN74ACT7805

更新时间： 2024-11-15 22:20:23

品牌	Logo	应用领域
德州仪器 - TI		存储
页数	文件大小	规格书
14页	195K
描述
256 】 18 CLOCKED FIRST-IN, FIRST-OUT MEMORY

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SN74ACT7805 数据手册

SN74ACT7805

256 × 18 CLOCKED FIRST-IN, FIRST-OUT MEMORY

SCAS201B – MARCH 1991 – REVISED APRIL 1998

DL PACKAGE

(TOP VIEW)

Member of the Texas Instruments

Widebus Family

Free-Running Read and Write Clocks Can

Be Asynchronous or Coincident

RESET

D17

D16

D15

D14

D13

D12

D11

OE1

Q17

Q16

Q15

GND

Q14

Read and Write Operations Synchronized

to Independent System Clocks

Input-Ready Flag Synchronized to Write

Clock

Output-Ready Flag Synchronized to Read

Clock

Q13

Q12

Q11

Q10

GND

D10

256 Words by 18 Bits

Low-Power Advanced CMOS Technology

Half-Full Flag and Programmable

Almost-Full/Almost-Empty Flag

GND

Bidirectional Configuration and Width

Expansion Without Additional Logic

Fast Access Times of 12 ns With a 50-pF

Load and All Data Outputs Switching

Simultaneously

GND

Data Rates up to 67 MHz

Pin-to-Pin Compatible With SN74ACT7803

and SN74ACT7813

Packaged in Shrink Small-Outline 300-mil

Package Using 25-mil Center-to-Center

Spacing

PEN

AF/AE

WRTCLK

WRTEN2

WRTEN1

RDCLK

RDEN

OE2

description

TheSN74ACT7805isa256-word×18-bitclocked

FIFO suited for buffering asynchronous data

paths up to 67-MHz clock rates and 12-ns access

times. Two devices can be configured for bidirectional data buffering without additional logic. Multiple distributed

and GND pins, along with Texas Instruments patented output edge control (OEC ) circuit, dampen

simultaneous switching noise.

The write clock (WRTCLK) and read clock (RDCLK) are free running and can be asynchronous or coincident.

Data is written to memory on the rising edge of WRTCLK when WRTEN1 is high, WRTEN2is low, and IR is high.

Data is read from memory on the rising edge of RDCLK when RDEN, OE1, and OE2 are low and OR is high.

The first word written to memory is clocked through to the output buffer, regardless of the RDEN, OE1, and OE2

levels. The OR flag indicates that valid data is present on the output buffer.

The FIFO can be reset asynchronously to WRTCLK and RDCLK. RESET must be asserted while at least four

WRTCLK and four RDCLK rising edges occur to clear the synchronizing registers. Resetting the FIFO initializes

the input-ready (IR), output-ready (OR), and half-full (HF) flags low and the almost-full/almost-empty (AF/AE)

flag high. The FIFO must be reset upon power up.

The SN74ACT7805 is characterized for operation from 0°C to 70°C.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

Widebus and OEC are trademarks of Texas Instruments Incorporated.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

12 3 4 5 6 7...14

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与SN74ACT7805相关器件

型号	品牌	获取价格	描述	数据表
SN74ACT7805_06	TI	获取价格	256 】 18 CLOCKED FIRST-IN, FIRST-OUT MEMORY
SN74ACT7805-15DL	TI	获取价格	256 】 18 CLOCKED FIRST-IN, FIRST-OUT MEMORY
SN74ACT7805-15DLR	TI	获取价格	256 】 18 CLOCKED FIRST-IN, FIRST-OUT MEMORY
SN74ACT7805-20DL	TI	获取价格	256 】 18 CLOCKED FIRST-IN, FIRST-OUT MEMORY
SN74ACT7805-20DLR	TI	获取价格	256 】 18 CLOCKED FIRST-IN, FIRST-OUT MEMORY
SN74ACT7805-25DL	TI	获取价格	256 】 18 CLOCKED FIRST-IN, FIRST-OUT MEMORY
SN74ACT7805-25DLR	TI	获取价格	256 】 18 CLOCKED FIRST-IN, FIRST-OUT MEMORY
SN74ACT7805-40DL	TI	获取价格	256 】 18 CLOCKED FIRST-IN, FIRST-OUT MEMORY
SN74ACT7805-40DLR	TI	获取价格	256 】 18 CLOCKED FIRST-IN, FIRST-OUT MEMORY
SN74ACT7805DL	TI	获取价格	256 】 18 CLOCKED FIRST-IN, FIRST-OUT MEMORY

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