!
SDAS154A − D2822, DECEMBER 1983 − REVISED JANUARY 1990
•
•
•
•
•
•
•
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
SN74AS850A, SN74AS851B . . . N PACKAGE
(TOP VIEW)
D7
D6
D5
D4
D3
D2
D1
D0
GY
G
GW
CLK/SC †
W
GND
1
28
2
27
3
26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
VCC
D8
D9
D10
D11
D12
D13
D14
D15
Y
S0
S1
S2
S3
† CLK for ’AS850A or SC for ’AS851B
description
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.
Copyright 1990, Texas Instruments Incorporated
"#$%&'()"%# "* +,&&-#) (* %$ .,/0"+()"%# 1()-2
&%1,+)* +%#$%&' )% *.-+"$"+()"%#* .-& )3- )-&'* %$ -4(* #*)&,'-#)*
*)(#1(&1 5(&&(#)62 &%1,+)"%# .&%+-**"#7 1%-* #%) #-+-**(&"06 "#+0,1)-*)"#7 %$ (00 .(&('-)-&*2
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
•
1
!
SDAS154A − D2822, DECEMBER 1983 − REVISED JANUARY 1990
FUNCTION TABLE
INPUT SELECTION TABLE
’AS850A ’AS851B
SELECT INPUTS
S3
S2
S1
S0
CLK
SC
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
X
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
X
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
X
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
X
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
H or L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
OUTPUT FUNCTION TABLE
INPUT
SELECTED
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
Dn
G
GY GW
H
L
L
L
L
X
H
L
H
L
X
L
L
H
H
OUTPUTS
Y
W
Z
Z
D
Z
D
Z
Z
Z
D
D
D = level of selected input D0 − D15
D = the input selected before the most-recent low-to-high
transition of CLK or SC.
logic symbols†
’AS850A
G
GY
GW
CLK
S0
S1
S2
S3
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
10
9
11
12
18
17
16
15
8
7
6
5
4
3
2
1
27
26
25
24
23
22
21
20
’AS851B
MUX
G20
20EN21
20EN22
C23
23 D0
G
GY
GW
SC
S0
S1
S2
S3
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
G0
15
23 D3
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
21
22
19
13
Y
W
10
9
11
12
18
17
16
15
8
7
6
5
4
3
2
1
27
26
25
24
23
22
21
20
† These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
2
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
•
MUX
G20
20EN21
20EN22
C23
23 D0
G0
15
23 D3
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
21
22
19
13
Y
W
!
SDAS154A − D2822, DECEMBER 1983 − REVISED JANUARY 1990
’AS850A logic diagram (positive logic) (see inset for ’AS851B)
G
10
9
11
GW 12
CLK
18
S0
GY
S1
S2
S3
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
17
16
15
C1
1D
C1
1D
C1
1D
C1
1D
SC
S0
S1
S2
S3
12
18
C1
1D
17
C1
1D
16
C1
1D
15
C1
1D
8
’AS851B
Selection
Latches
≥1
[OR]
7
6
5
4
3
2
19
1
Y
27
13
26
W
25
24
23
22
21
20
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
•
3
!
SDAS154A − D2822, DECEMBER 1983 − REVISED JANUARY 1990
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Operating free-air temperature range: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C
SN74AS850A recommended operating conditions
MIN
NOM
MAX
4.5
5
5.5
UNIT
VCC
VIH
Supply voltage
VIL
IOH
Low-level input voltage
0.8
V
High-level output current
−15
mA
IOL
fclock
Low-level output current
48
mA
60
MHz
tw
Pulse duration
tsu
th
Setup time, select inputs before CLK↑
Hold time, select inputs after CLK↑
0
TA
Operating free-air temperature
0
High-level input voltage
2
Clock frequency
V
0
CLK high
8
CLK low
8
V
ns
10
ns
ns
70
°C
SN74AS850A electrical characteristics over recommended operating free-air temperature range
(unless otherwise noted)
PARAMETER
VIK
VOH
VOL
IOZH
IOZL
II
IIH
IIL
IO‡
ICC
D, G
All others
TEST CONDITIONS
VCC = 4.5 V,
VCC = 4.5 V,
II = − 18 mA
IOH = − 2 mA
VCC = 4.5 V,
VCC = 4.5 V,
IOH = − 15 mA
IOL = 48 mA
VCC = 5.5 V,
VCC = 4.5 V,
VO= 2. 7 V
VO = 0.4 V
VCC = 5.5 V,
VCC = 5.5 V,
VI = 7 V
VI = 2.7 V
VCC = 5.5 V,
VI = 0 .4 V
VCC = 5.5 V,
VO= 2.25 V
Outputs active
VCC = 5.5 V
Outputs disabled
MIN
TYP‡
MAX
UNIT
−1.2
V
2.5
2
V
3.3
0.35
0.5
V
50
µA
−50
µA
0.1
mA
20
µA
−1
−0.5
−30
−112
50
81
52
85
† All typical values are at VCC = 5 V, TA = 25°C.
‡ The output conditions have been chosen to produce a current that closely approximates one-half of the true short-circuit current, IOS.
4
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
•
mA
mA
mA
!
SDAS154A − D2822, DECEMBER 1983 − REVISED JANUARY 1990
switching characteristics (see Note 1)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
R1 = 500 Ω,
R2 = 500 Ω,
UNIT
TA = 0°C to 70°C
MIN
MAX
fmax
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
tPZH
tPZL
tPHZ
tPLZ
tPZH
tPZL
tPHZ
tPLZ
tPZH
tPZL
tPHZ
60
Any D
Y
Any D
W
CLK
Y
CLK
W
G
Y
G
Y
G
W
G
W
GY
Y
GY
Y
GW
W
GW
W
tPLZ
NOTE 1: Load circuit and voltage waveforms are shown in Section 1 of ALS/AS Logic Data Book, 1986.
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
•
MHz
3
10.5
3
11
3
8.5
1
8.5
3
14.5
3
17.5
3
15
3.5
13
2
9.5
3
11
1
6
2
8
2
9
3
10
1
6
2
9
2
9
3
11.5
1
6
2
9
2
10
3
12
1
6
2
11
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
5
!
SDAS154A − D2822, DECEMBER 1983 − REVISED JANUARY 1990
recommended operating conditions
MIN
NOM
MAX
4.5
5
5.5
UNIT
VCC
VIH
Supply voltage
VIL
IOH
Low-level input voltage
0.8
V
High-level output current
−15
mA
IOL
tw
Low-level output current
48
mA
Pulse duration, SC low
10
ns
tsu
th
Setup time, select inputs before SC↑
4.5
ns
Hold time, select inputs after SC↑
0
TA
Operating free-air temperature
0
High-level input voltage
V
2
V
ns
°C
70
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VOH
VOL
IOZH
IOZL
II
IIH
IIL
IO‡
ICC
D, G
All others
TEST CONDITIONS
VCC = 4.5 V,
VCC = 4.5 V,
II = − 18 mA
IOH = − 2 mA
VCC = 4.5 V,
VCC = 4.5 V,
IOH = − 15 mA
IOL = 48 mA
VCC = 5.5 V,
VCC = 5.5 V,
VO = 2. 7 V
VO = 0.4 V
VCC = 5.5 V,
VCC = 5.5 V,
VI = 7 V
VI = 2.7 V
VCC = 5.5 V,
VI = 0 .4 V
VCC = 5.5 V,
VO = 2.25 V
Outputs active
VCC = 5.5 V
Outputs disabled
MIN
TYP‡
MAX
UNIT
−1.2
V
2.5
2
V
3.3
0.35
0.5
V
50
µA
−50
µA
0.1
mA
20
µA
−1
−0.5
−30
−112
50
81
52
85
† All typical values are at VCC = 5 V, TA = 25°C.
‡ The output conditions have been chosen to produce a current that closely approximates one-half of the true short-circuit current, IOS.
6
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
•
mA
mA
mA
!
SDAS154A − D2822, DECEMBER 1983 − REVISED JANUARY 1990
switching characteristics (see Note 1)
PARAMETER
TO
(OUTPUT)
FROM
(INPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω,
UNIT
R2 = 500 Ω,
TA = MIN to MAX
MIN
MAX
tPLH
tPHL
Any D
Y
tPLH
tPHL
Any D
W
tPLH
tPHL
S0, S1, S2, S3
Y
tPLH
tPHL
S0, S1, S2, S3
W
tPLH
tPHL
SC
Y
tPLH
tPHL
SC
W
tPZH
tPZL
G
Y
tPHZ
tPLZ
G
Y
tPZH
tPZL
G
W
tPHZ
tPLZ
G
W
tPZH
tPZL
GY
Y
tPHZ
tPLZ
GY
Y
tPZH
tPZL
GW
W
tPHZ
tPLZ
GW
W
3
10.5
3
11
3
8
1
8
3
18
3
19
3
16
3
15
3
18
3
20
3
16
3
15
2
8
3
11
1
6
2
8
2
8
3
10
1
6
2
8
2
8
3
11
1
6
2
8
2
10
3
12
1
6.5
2
11
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
NOTE 1: Load circuit and voltage waveforms are shown in Section 1 of ALS/AS Logic Data Book, 1986.
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
•
7
!
SDAS154A − D2822, DECEMBER 1983 − REVISED JANUARY 1990
TYPICAL APPLICATION DATA
The ’AS850A or ’AS851B can be used as a 1-of-16 Boolean function generator. Figure 1 shows the ’AS850A
in one example.
’ALS138
BIN/OCT
G1
G2A
G2B
&
A
1
B
2
C 4
0
EN1
2
3
4
5
6
7
’AS850A
G
GY
GW
CLK
S0
S1
S2
S3
D0
D1
D2
D3
D4
D5
ENABLE
DISABLE
D6
D7
D8
D9
D10
D11
D12
D13
D14
’AS163
CTRDIV16
5CT= 0
CLR
LOAD
COUNT
DISABLE
CLOCK
M1
RCO
M2 3CT=15
ENT
G3
ENP
G4
CLK
C5/2,3,4+
A 1,5D
B
C
D
D15
QA
QB
QC
QD
Figure 1. 1 - of - 16 Boolean Function Generator
8
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
•
MUX
G20
20EN21
20EN22
C23
23 D0
G
23 D3
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
15
21
Y
22
W
!
SDAS154A − D2822, DECEMBER 1983 − REVISED JANUARY 1990
TYPICAL APPLICATION DATA
’AS850A
G
GY
GW
CLK
S0
S1
S2
S3
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
CLOCK
A
B
C
D
E
MUX
G20
20EN21
20EN22
C23
23 D0
G
23 D3
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
15
21
22
Y
W
Y
’AS850A
G
GY
GW
CLK
S0
S1
S2
S3
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
W
MUX
G20
20EN21
20EN22
C23
23 D0
G
23 D3
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
15
21
22
Y
W
Figure 2. 1 - of - 32 Data/Selector/Multiplexer
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
•
9
!
SDAS154A − D2822, DECEMBER 1983 − REVISED JANUARY 1990
TYPICAL APPLICATION DATA
CLOCK
’AS850A
’AS850A
G20 MUX
G
GY
GW
G
G20 MUX
GY
20EN21
20EN22
GW
CLK
C23
CLK
S0
23 D0
S0
S1
S3
D0
23 D3
0
B
D1
1
C
D2
2
D3
D4
A
D
C23
23 D0
S1
0
G 15
S2
20EN21
20EN22
0
G 15
S2
Y
S3
D0
23 D3
0
D1
1
D2
2
3
D3
3
4
D4
4
D5
D6
5
6
21
W
D5
D6
5
6
D7
7
D7
7
D8
D9
8
9
D8
D9
8
9
D10
D11
22
10
11
D10
D11
10
11
D12
12
D12
12
D13
D14
13
14
D13
D14
13
14
D15
15
D15
15
21
Y
W
22
S0
S1
Y
S2
S3
W
’AS850A
’AS850A
G
G
G20 MUX
GY
GW
G20 MUX
GY
20EN21
20EN22
GW
CLK
C23
CLK
S0
23 D0
S0
S1
S3
D0
23 D3
0
D1
1
D2
2
21
C23
23 D0
S1
0
G 15
S2
20EN21
20EN22
0
G 15
S2
Y
S3
D0
23 D3
0
D1
1
D2
2
D3
3
D3
3
D4
4
D4
4
D5
D6
5
6
D5
D6
5
6
D7
7
D7
7
D8
D9
8
9
D8
D9
8
9
D10
D11
W
22
10
11
D10
D11
10
11
D12
12
D12
12
D13
D14
13
14
D13
D14
13
14
D15
15
D15
15
Figure 3. 1 - of - 64 Data Selector/Multiplexer
10
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
•
21
Y
W
22
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements,
and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should
obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are
sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard
warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where
mandated by government requirements, testing of all parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and
applications using TI components. To minimize the risks associated with customer products and applications, customers should provide
adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right,
or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information
published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a
warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual
property of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied
by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive
business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional
restrictions.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all
express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not
responsible or liable for any such statements.
TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably
be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing
such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products
and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be
provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in
such safety-critical applications.
TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are
specifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet military
specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at
the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.
TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are
designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated
products in automotive applications, TI will not be responsible for any failure to meet such requirements.
Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products
Amplifiers
Data Converters
DSP
Clocks and Timers
Interface
Logic
Power Mgmt
Microcontrollers
RFID
RF/IF and ZigBee® Solutions
amplifier.ti.com
dataconverter.ti.com
dsp.ti.com
www.ti.com/clocks
interface.ti.com
logic.ti.com
power.ti.com
microcontroller.ti.com
www.ti-rfid.com
www.ti.com/lprf
Applications
Audio
Automotive
Broadband
Digital Control
Medical
Military
Optical Networking
Security
Telephony
Video & Imaging
Wireless
www.ti.com/audio
www.ti.com/automotive
www.ti.com/broadband
www.ti.com/digitalcontrol
www.ti.com/medical
www.ti.com/military
www.ti.com/opticalnetwork
www.ti.com/security
www.ti.com/telephony
www.ti.com/video
www.ti.com/wireless
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2008, Texas Instruments Incorporated