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SN74ACT2235PAG PDF预览

SN74ACT2235PAG

更新时间: 2024-10-28 23:03:11
品牌 Logo 应用领域
德州仪器 - TI 存储
页数 文件大小 规格书
13页 178K
描述
1024 】 9 】 2 ASYNCHRONOUS BIDIRECTIONAL FIRST-IN, FIRST-OUT MEMORY

SN74ACT2235PAG 数据手册

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SN74ACT2235  
1024 × 9 × 2  
ASYNCHRONOUS BIDIRECTIONAL FIRST-IN, FIRST-OUT MEMORY  
SCAS148E – DECEMBER 1990 – REVISED APRIL 1998  
Independent Asynchronous Inputs and  
Outputs  
Access Times of 25 ns With a 50-pF Load  
Data Rates up to 50 MHz  
Low-Power Advanced CMOS Technology  
Bidirectional  
Fall-Through Times of 22 ns Maximum  
High Output Drive for Direct Bus Interface  
Dual 1024 by 9 Bits  
Package Options Include 44-Pin Plastic  
Leaded Chip Carriers (FN) and 64-Pin Thin  
Quad Flat (PAG, PM) Packages  
Programmable Almost-Full/Almost-Empty  
Flag  
Empty, Full, and Half-Full Flags  
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 SN74ACT2235 is arranged as two 1024 by 9-bit FIFOs for high speed and fast access times.  
It processes data at rates up to 50 MHz, with access times of 25 ns in a bit-parallel format.  
The SN74ACT2235 consists of bus-transceiver circuits, two 1024 × 9 FIFOs, and control circuitry arranged for  
multiplexed transmission of data directly from the data bus or from the internal FIFO memories. Enable (GAB  
and GBA) inputs are provided to control the transceiver functions. The select-control (SAB and SBA) inputs are  
provided to select whether real-time or stored data is transferred. The circuitry used for select control eliminates  
the typical decoding glitch that occurs in a multiplexer during the transition between stored and real-time data.  
Figure 2 shows the eight fundamental bus-management functions that can be performed with the  
SN74ACT2235.  
For more information on this device family, see the application report, 1K × 9 × 2 Asynchronous FIFO  
SN74ACT2235, literature number SCAA010.  
The SN74ACT2235 is characterized for operation from 0°C to 70°C.  
FN PACKAGE  
(TOP VIEW)  
6 5  
4
3
2
1 44 43 42 41 40  
39  
B2  
B3  
B4  
V
B5  
B6  
B7  
B8  
GND  
AF/AEB  
HFB  
A3  
A4  
7
8
38  
37  
36  
35  
34  
33  
32  
31  
30  
29  
V
9
CC  
A5  
10  
11  
12  
13  
14  
15  
16  
17  
CC  
A6  
A7  
A8  
GND  
AF/AEA  
HFA  
LDCKA  
18 19 20 21 22 23 24 25 26 27 28  
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.  
Copyright 1998, 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.  
1
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  

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