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SN54ALS299_16 PDF预览

SN54ALS299_16

更新时间: 2024-02-02 01:19:00
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德州仪器 - TI 输出元件
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7页 121K
描述
8-BIT UNIVERSAL SHIFT/STORAGE REGISTERS WITH 3-STATE OUTPUTS

SN54ALS299_16 数据手册

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SN54ALS299, SN74ALS299  
8-BIT UNIVERSAL SHIFT/STORAGE REGISTERS  
WITH 3-STATE OUTPUTS  
SDAS220B – DECEMBER 1982 – REVISED DECEMBER 1994  
SN54ALS299 . . . J PACKAGE  
SN74ALS299 . . . DW OR N PACKAGE  
(TOP VIEW)  
Multiplexed I/O Ports Provide Improved Bit  
Density  
Four Modes of Operation:  
– Hold (Store)  
1
2
3
4
5
6
7
8
9
10  
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
S0  
OE1  
OE2  
V
CC  
S1  
– Shift Right  
– Shift Left  
– Load Data  
SL  
G/Q  
Q
H  
G
Operate With Outputs Enabled or at High  
E/Q  
H/Q  
E
H
Impedance  
C/Q  
F/Q  
C
F
3-State Outputs Drive Bus Lines Directly  
Can Be Cascaded for n-Bit Word Lengths  
Direct Overriding Clear  
A/Q  
Q
D/Q  
B/Q  
A
D
A′  
B
CLR  
GND  
CLK  
SR  
Applications:  
– Stacked or Push-Down Registers  
– Buffer Storage  
SN54ALS299 . . . FK PACKAGE  
(TOP VIEW)  
– Accumulator Registers  
Package Options Include Plastic  
Small-Outline (DW) Packages, Ceramic  
Chip Carriers (FK), and Standard Plastic (N)  
and Ceramic (J) 300-mil DIPs  
3
2
1
20 19  
18  
4
5
6
7
8
G/Q  
SL  
G
17  
16  
15  
14  
E/Q  
Q
E
C
H′  
description  
C/Q  
A/Q  
H/Q  
H
F/Q  
A
F
These 8-bit universal shift/storage registers  
feature multiplexed I/O ports to achieve full 8-bit  
data handling in a single 20-pin package. Two  
function-select (S0, S1) inputs and two output-  
enable (OE1, OE2) inputs can be used to choose  
the modes of operation listed in the function table.  
Q
D/Q  
D
A′  
9 10 11 12 13  
Synchronous parallel loading is accomplished by taking both S0 and S1 high. This places the 3-state outputs  
in the high-impedance state and permits data applied on the I/O ports to be clocked into the register. Reading  
out of the register can be accomplished while the outputs are enabled in any mode. Clearing occurs  
asynchronously when the clear (CLR) input is low. Taking either OE1 or OE2 high disables the outputs, but has  
no effect on clearing, shifting, or storing data.  
The SN54ALS299 is characterized for operation over the full military temperature range of 55°C to 125°C. The  
SN74ALS299 is characterized for operation from 0°C to 70°C.  
Copyright 1994, 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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