SN74ACT7808-30PMR

更新时间： 2024-11-16 13:13:47

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德州仪器 - TI		/
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18页	293K
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SN74ACT7808

2048 × 9 STROBED FIRST-IN, FIRST-OUT MEMORY

SCAS205E – FEBRUARY 1991 – REVISED NOVEMBER 2001

Load Clocks and Unload Clocks Can Be

Asynchronous or Coincident

Expansion Logic for Depth Cascading

Empty, Full, and Half-Full Flags

Fall-Through Time of 20 ns Typical

Data Rates up to 50 MHz

2048 Words by 9 Bits

Low-Power Advanced CMOS Technology

Fast Access Times of 15 ns With a 50-pF

Load

3-State Outputs

Package Options Include 44-Pin Plastic

Leaded Chip Carrier (FN), 64-Pin Thin Quad

Flat (PM), and Reduced-Height 64-Pin Quad

Flat (PAG) Packages

Programmable Almost-Full/Almost-Empty

Flag

description

A FIFO memory is a storage device that allows data to be written into and read from its array at independent

data rates. The SN74ACT7808 is a 2048-word by 9-bit FIFO designed for high speed and fast access times.

It processes data at rates up to 50 MHz and access times of 15 ns in a bit-parallel format.

Data is written into memory on a low-to-high transition at the load-clock (LDCK) input and is read out on a

low-to-high transition at the unload-clock (UNCK) input. The memory is full when the number of words clocked

in exceeds the number of words clocked out by 2048. When the memory is full, LDCK signals have no effect

on the data residing in memory. When the memory is empty, UNCK signals have no effect.

Status of the FIFO memory is monitored by the full (FULL), empty (EMPTY), half-full (HF), and

almost-full/almost-empty (AF/AE) flags. The FULL output is low when the memory is full and high when the

memory is not full. The EMPTY output is low when the memory is empty and high when it is not empty. The HF

output is high when the FIFO contains 1024 or more words and is low when it contains 1023 or fewer words.

The AF/AE status flag is a programmable flag. The first one or two low-to-high transitions of LDCK after reset

can be used to program the almost-empty offset value (X) and the almost-full offset value (Y) if program enable

(PEN) is low. The AF/AE flag is high when the FIFO contains X or fewer words or (2048 – Y) or more words.

The AF/AE flag is low when the FIFO contains between (X + 1) and (2047 – Y) words.

A low level on the reset (RESET) input resets the internal stack pointers and sets FULL high, AF/AE high, HF

low, and EMPTY low. The Q outputs are not reset to any specific logic level.

The first word loaded into empty memory causes EMPTY to go high and the data to appear on the Q outputs.

Itisimportanttonotethatthefirstworddoesnothavetobeunloaded. Dataoutputsarenoninvertingwithrespect

to the data inputs and are in the high-impedance state when the output-enable (OE) input is low. OE does not

affect the output flags.

Cascading is easily accomplished in the word-width and word-depth directions. When not using the FIFO in

depth expansion, cascade enable (CASEN) must be tied high.

The FIFO must be reset upon power up.

The SN74ACT7808 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.

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...18

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与SN74ACT7808-30PMR相关器件

型号	品牌	获取价格	描述	数据表
SN74ACT7808-40FN	TI	获取价格	2048 】 9 STROBED FIRST-IN, FIRST-OUT MEMORY
SN74ACT7808-40PAG	TI	获取价格	2048 】 9 STROBED FIRST-IN, FIRST-OUT MEMORY
SN74ACT7808-40PAGR	TI	获取价格	2K X 9 OTHER FIFO, 28 ns, PQFP64, GREEN, PLASTIC, TQFP-64
SN74ACT7808-40PM	TI	获取价格	2048 】 9 STROBED FIRST-IN, FIRST-OUT MEMORY
SN74ACT7808-40PMR	TI	获取价格	2KX9 OTHER FIFO, 28ns, PQFP64, PLASTIC, LQFP-64
SN74ACT7808FN	TI	获取价格	2048 】 9 STROBED FIRST-IN, FIRST-OUT MEMORY
SN74ACT7808PAG	TI	获取价格	2048 】 9 STROBED FIRST-IN, FIRST-OUT MEMORY
SN74ACT7808PM	TI	获取价格	2048 】 9 STROBED FIRST-IN, FIRST-OUT MEMORY
SN74ACT7811	TI	获取价格	1024 】 18 CLOCKED FIRST-IN, FIRST-OUT MEMORY
SN74ACT7811-15FN	ROCHESTER	获取价格	1KX18 OTHER FIFO, 15ns, PQCC68, PLASTIC, LCC-68

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