參數(shù)資料
型號(hào)： SN74ACT3638PQ
廠商： Texas Instruments, Inc.
英文描述： Low-Voltage Quad 2-Input OR Gate with 5V-Tolerant Inputs; Package: TSSOP-14; No of Pins: 14; Container: Tape and Reel; Qty per Container: 2500
中文描述： 512】32】2時(shí)鐘雙向先入先出存儲(chǔ)器
文件頁(yè)數(shù)： 3/30頁(yè)
文件大?。?/td> 461K
代理商： SN74ACT3638PQ
SN74ACT3638
512
×
32
×
2
CLOCKED BIDIRECTIONAL FIRST-IN, FIRST-OUT MEMORY
SCAS228D – JUNE 1992 – REVISED APRIL 1998
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description
The SN74ACT3638 is a high-speed, low-power CMOS clocked bidirectional FIFO memory. It supports clock
frequencies up to 67 MHz and has read access times as fast as 11 ns. Two independent 512
×
32 dual-port
SRAM FIFOs on the chip buffer data in opposite directions. The FIFO memory buffering data from port A to port
B has retransmit capability, which allows previously read data to be accessed again. Each FIFO has flags to
indicate empty and full conditions and two programmable flags (almost full and almost empty) to indicate when
a selected number of words is stored in memory. Communication between each port can bypass the FIFOs via
two 32-bit mailbox registers. Each mailbox register has a flag to signal when new mail has been stored. Two
or more devices can be used in parallel to create wider datapaths.
The SN74ACT3638 is a clocked FIFO, which means each port employs a synchronous interface. All data
transfers through a port are gated to the low-to-high transition of a continuous (free-running) port clock by enable
signals. The continuous clocks for each port are independent of one another and can be asynchronous or
coincident. The enables for each port are arranged to provide a simple bidirectional interface between
microprocessors and/or buses with synchronous control.
The input-ready (IRA, IRB) flags and almost-full (AFA, AFB) flags of the SN74ACT3638 are two-stage
synchronized to the port clock that writes data to its array. The output-ready (ORA, ORB) flags and almost-empty
(AEA, AEB) flags of the SN74ACT3638 are two-stage synchronized to the port clock that reads data from its
array. Offsets for the almost-full and almost-empty flags of both FIFOs can be programmed from port A.
The SN74ACT3638 is characterized for operation from 0
°
C to 70
°
C.
For more information on this device family, see the application reports FIFO Mailbox-Bypass Registers: Using
Bypass Registers to Initialize DMA Control(literature number SCAA007) and Metastability Performance of
Clocked FIFOs(literature number SCZA004).
相關(guān)PDF資料
PDF描述
SN74ACT3641PCB Low-Voltage Quad 2-Input OR Gate with 5V-Tolerant Inputs; Package: SOEIAJ-14; No of Pins: 14; Container: Tape and Reel; Qty per Container: 2000
SN74ACT3641PQ Low-Voltage Quad 2-Input OR Gate with 5V-Tolerant Inputs, Pb-free; Package: SOEIAJ-14; No of Pins: 14; Container: Tape and Reel; Qty per Container: 2000
SN74ACT3651PCB Low-Voltage CMOS Octal Transparent Latch; Package: TSSOP 20 LEAD; No of Pins: 20; Container: Rail; Qty per Container: 75
SN74ACT3651PQ Low-Voltage CMOS Octal Transparent Latch; Package: TSSOP 20 LEAD; No of Pins: 20; Container: Tape and Reel; Qty per Container: 2500
SN74ACT373DB OCTAL D-TYPE TRANSPARENT LATCHES WITH 3-STATE OUTPUTS
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SN74ACT3641-15PCB 功能描述:先進(jìn)先出 1024 x 36 synch 先進(jìn)先出 Memory RoHS:否 制造商:IDT 電路數(shù)量: 數(shù)據(jù)總線寬度:18 bit 總線定向:Unidirectional 存儲(chǔ)容量:4 Mbit 定時(shí)類型:Synchronous 組織:256 K x 18 最大時(shí)鐘頻率:100 MHz 訪問(wèn)時(shí)間:10 ns 電源電壓-最大:3.6 V 電源電壓-最小:6 V 最大工作電流:35 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-80 封裝:
SN74ACT3641-15PQ 功能描述:先進(jìn)先出 1024 x 36 synch 先進(jìn)先出 Memory RoHS:否 制造商:IDT 電路數(shù)量: 數(shù)據(jù)總線寬度:18 bit 總線定向:Unidirectional 存儲(chǔ)容量:4 Mbit 定時(shí)類型:Synchronous 組織:256 K x 18 最大時(shí)鐘頻率:100 MHz 訪問(wèn)時(shí)間:10 ns 電源電壓-最大:3.6 V 電源電壓-最小:6 V 最大工作電流:35 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-80 封裝:
SN74ACT3641-20PCB 功能描述:先進(jìn)先出 1024 x 36 synch 先進(jìn)先出 Memory RoHS:否 制造商:IDT 電路數(shù)量: 數(shù)據(jù)總線寬度:18 bit 總線定向:Unidirectional 存儲(chǔ)容量:4 Mbit 定時(shí)類型:Synchronous 組織:256 K x 18 最大時(shí)鐘頻率:100 MHz 訪問(wèn)時(shí)間:10 ns 電源電壓-最大:3.6 V 電源電壓-最小:6 V 最大工作電流:35 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-80 封裝:
SN74ACT3641-20PQ 功能描述:先進(jìn)先出 1024 x 36 synch 先進(jìn)先出 Memory RoHS:否 制造商:IDT 電路數(shù)量: 數(shù)據(jù)總線寬度:18 bit 總線定向:Unidirectional 存儲(chǔ)容量:4 Mbit 定時(shí)類型:Synchronous 組織:256 K x 18 最大時(shí)鐘頻率:100 MHz 訪問(wèn)時(shí)間:10 ns 電源電壓-最大:3.6 V 電源電壓-最小:6 V 最大工作電流:35 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-80 封裝:
SN74ACT3641-30PCB 功能描述:先進(jìn)先出 1024 x 36 synch 先進(jìn)先出 Memory RoHS:否 制造商:IDT 電路數(shù)量: 數(shù)據(jù)總線寬度:18 bit 總線定向:Unidirectional 存儲(chǔ)容量:4 Mbit 定時(shí)類型:Synchronous 組織:256 K x 18 最大時(shí)鐘頻率:100 MHz 訪問(wèn)時(shí)間:10 ns 電源電壓-最大:3.6 V 電源電壓-最小:6 V 最大工作電流:35 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-80 封裝:
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