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Texas Instruments (TI) Electronic Components Datasheet

SN74AS850A Datasheet

1 Of 16 Data Selectors/Multiplexers

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4-Line to 1-Line Data Selectors/Multiplexers
That Can Select 1 of 16 Data Inputs Typical
Applications:
Boolean Function Generators
Parallel-to-Serial Converters
Data Source Selectors
Cascadable to n-Bits
3-State Bus Driver Outputs
’AS850A Offers Clocked Selects; ’AS851B
Offers Enable-Controlled Selects
Has a Master Output Control (G) for
Cascading and individual Output Controls
(GY, GW) for Each Output
Package Option Includes 600-mil Standard
Plastic DIPs
Dependable Texas Instruments Quality and
Reliability
description
SN74AS850A, SN74AS851B
1 OF 16 DATA SELECTORS/MULTIPLEXERS
WITH 3ĆSTATE OUTPUTS
SDAS154A − D2822, DECEMBER 1983 − REVISED JANUARY 1990
SN74AS850A, SN74AS851B . . . N PACKAGE
(TOP VIEW)
D7
D6
D5
D4
D3
D2
D1
D0
GY
G
GW
CLK/SC
W
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 VCC
27 D8
26 D9
25 D10
24 D11
23 D12
22 D13
21 D14
20 D15
19 Y
18 S0
17 S1
16 S2
15 S3
CLK for ’AS850A or SC for ’AS851B
These four-line to one-line data selectors/multiplexers provide full binary decoding to select one-of-sixteen data
sources with complementary Y and W outputs. The ’AS850A has a clock-controlled select register allowing for
a symmetrical presentation of the select inputs to the decoder while the ’AS851B has an enable-controlled select
register allowing the user to select and hold one particular data line.
A buffered group of output controls (G, GY, GW) can be used to place the two outputs in either a normal logic
(high or low logic level) or a high-impedance state. In the high-impedance state, the outputs neither load nor
drive the bus lines significantly. The high-impedance third state and increased drive provide the capability to
drive the bus lines in a bus-organized system without the need for interface or pullup components.
The output controls do not affect the internal operations of the data selector/multiplexer. New data can be setup
while the outputs are in the high-impedance state.
The SN74AS850A and SN74AS851B are characterized for operation from 0°C to 70°C.
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
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
Copyright 1990, Texas Instruments Incorporated
1


Texas Instruments (TI) Electronic Components Datasheet

SN74AS850A Datasheet

1 Of 16 Data Selectors/Multiplexers

No Preview Available !

SN74AS850A, SN74AS851B
1 OF 16 DATA SELECTORS/MULTIPLEXERS
WITH 3ĆSTATE OUTPUTS
SDAS154A − D2822, DECEMBER 1983 − REVISED JANUARY 1990
FUNCTION TABLE
INPUT SELECTION TABLE
SELECT INPUTS ’AS850A ’AS851B INPUT
S3 S2 S1 S0 CLK
SC SELECTED
L L LL
L L LH
L L HL
L L HH
L HLL
L HLH
L H HL
L H HH
HL LL
HL LH
H L HL
H L HH
HHLL
HHLH
H H HL
H H HH
X X X X H or L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
Dn
D = the input selected before the most-recent low-to-high
transition of CLK or SC.
OUTPUT FUNCTION TABLE
OUTPUTS
G GY GW
YW
H XX
L HL
L LL
L HH
L LH
ZZ
ZZ
DZ
ZD
DD
D = level of selected input D0 − D15
logic symbols
G 10
GY 9
GW
CLK
11
12
S0
S1
18
17
S2 16
S3 15
D0 8
7
D1
D2
6
5
D3
D4 4
D5 3
D6 2
D7 1
D8
D9
27
26
D10 25
24
D11
D12
23
22
D13
D14
21
20
D15
’AS850A
G20 MUX
20EN21
20EN22
C23
23 D0
23 D3
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
G0
15
21
22
19
Y
13 W
G 10
GY 9
GW
SC
11
12
S0
S1
18
17
S2 16
S3 15
D0 8
7
D1
D2
6
5
D3
D4 4
D5 3
D6 2
D7 1
D8
D9
27
26
D10 25
24
D11
D12
23
22
D13
D14
21
20
D15
’AS851B
G20 MUX
20EN21
20EN22
C23
23 D0
23 D3
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
G0
15
21
22
19
Y
13 W
These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
ą
2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001


Part Number SN74AS850A
Description 1 Of 16 Data Selectors/Multiplexers
Maker Texas
Total Page 11 Pages
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