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SN74ALS235DW 数据表(PDF) 2 Page - Texas Instruments

部件名 SN74ALS235DW
功能描述  64 X 5 ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMORY
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

SN74ALS235DW 数据表(HTML) 2 Page - Texas Instruments

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SN74ALS235
64 × 5 ASYNCHRONOUS FIRST IN, FIRST OUT MEMORY
SDAS108A − OCTOBER 1986 − REVISED SEPTEMBER 1993
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251−1443
description (continued)
The FIFO must be reset after power up with a low-level pulse on the master reset (RST) input. This sets IR high
and OR low signifying that the FIFO is empty. Resetting the FIFO sets the outputs to a low logic level (see
Figure 1). If SI is high when RST goes high, the input data is shifted in and IR goes low and remains low until
SI goes low. If SI goes low before RST goes high, the input data will not be shifted in and IR goes high. Data
outputs are noninverting with respect to the data inputs and are at high impedance when the output-enable (OE)
input is high. OE does not affect the status-flag outputs (see Figure 2).
The SN74ALS235 is characterized for operation from 0
°C to 70°C.
logic symbol
1D
5
D0
Q0
16
6
D1
Q1
15
7
D2
Q2
14
8
D3
Q3
13
9
D4
Q4
12
FIFO 64
× 5
CTR
RST
6
4
SI
G2
R
11
OR
17
5 + /C1
18
SO
G3
4 −
EN 6
1
AF/AE
19
HF
2
IR
3
OE
CT = 0
3CT > 0
(CT > 0) G4
CT
≤ 8/CT ≥ 56
CT
≥ 32
2CT < 64
(CT < 64) G5
† This symbol is in accordance with ANSI/IEEE Standard 91-1984 and IEC Publication 617-12.


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