Fairchild Semiconductor DM74ALS157SJX, DM74ALS157SJ, DM74ALS157N, DM74ALS157MX, DM74ALS157M Datasheet
April 1984
Revised February 2000
DM74ALS157 • DM74ALS158
Quad 1-of-2 Line Data Selector/Multiplexer
General Description
These data selectors/multiplexers contain inverters and drivers to supply full on-chip data selection to the four output gates. A separate strobe input is provided. A 4-bit word is selected from one of two sources and is routed to the four outputs. The ALS157 presents true data whereas the ALS158 presents inverted data to minimize propagation delay time.
Features
■Switching specifications at 50 pF
■Switching specifications guaranteed over full temperature and VCC range
■Advanced oxide-isolated, ion-implanted Schottky TTL process
■Functionally and pin for pin compatible with Schottky and low power Schottky TTL counterpart
■Improved AC performance over Schottky and low power Schottky counterparts
■Expand any data input point
■Multiplex dual data buses
■General four functions of two variables (one variable is common)
■Source programmable counters
Ordering Code:
Order Number |
Package Number |
Package Description |
|
|
|
DM74ALS157M |
M16A |
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow |
|
|
|
DM74ALS157SJ |
M16D |
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide |
|
|
|
DM74ALS157N |
N16E |
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide |
|
|
|
DM74ALS158N |
N16E |
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide |
|
|
|
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram |
Function Table |
|
|
|
|||
|
|
|
|
|
|
|
|
|
|
Inputs |
|
|
Output Y |
||
|
|
|
|
|
|
|
|
|
Strobe |
Select |
|
A |
B |
DM74ALS157 |
DM74ALS158 |
|
|
|
|
|
|
|
|
|
H |
X |
|
X |
X |
L |
H |
|
L |
L |
|
L |
X |
L |
H |
|
L |
L |
|
H |
X |
H |
L |
|
L |
H |
|
X |
L |
L |
H |
|
L |
H |
|
X |
H |
H |
L |
|
|
|
|
|
|
|
|
|
H = HIGH |
Level |
|
|
|
|
|
|
L = LOW Level |
|
|
|
|
||
|
X = Don't Care |
|
|
|
|
||
Selector/Multiplexer Data Line 2-of-1 Quad DM74ALS158 • DM74ALS157
© 2000 Fairchild Semiconductor Corporation |
DS006205 |
www.fairchildsemi.com |
DM74ALS157 • DM74ALS158
Logic Diagrams
DM74ALS157
DM74ALS158
www.fairchildsemi.com |
2 |
Loading...