Texas Instruments CD74HCT157E, CD74HCT158E, CD74HCT157M96, CD74HCT157M, CD74HC158M Datasheet
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Data sheet acquired from Harris Semiconductor SCHS153
CD74HC157, CD74HCT157, CD74HC158, CD74HCT158
September 1997
High Speed CMOS Logic
Quad 2-Input Multiplexers
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Features |
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Common Select Inputs |
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[ /Title |
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Separate Enable Inputs |
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(CD74H |
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Buffered inputs and Outputs |
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C157, |
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Fanout (Over Temperature Range) |
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CD74H |
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- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads |
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CT157, |
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- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads |
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CD74H |
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Wide Operating Temperature Range . . . -55oC to 125oC |
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C158, |
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Balanced Propagation Delay and Transition Times |
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CD74H |
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Significant Power Reduction Compared to LSTTL |
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CT158) |
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/Subject |
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Logic ICs |
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• HC Types |
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(High |
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Speed |
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- 2V to 6V Operation |
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-High Noise Immunity: NIL = 30%, NIH = 30%of VCC at VCC = 5V
•HCT Types
-4.5V to 5.5V Operation
-Direct LSTTL Input Logic Compatibility, VIL= 0.8V (Max), VIH = 2V (Min)
-CMOS Input Compatibility, Il ≤ 1μA at VOL, VOH
Pinout
CD74HC157, CD74HCT157, CD74HC158, CD74HCT158
(PDIP, SOIC)
TOP VIEW
S |
1 |
16 |
VCC |
1I0 |
2 |
15 |
E |
1I1 |
3 |
14 |
4I0 |
1Y |
4 |
13 |
4I1 |
2I0 |
5 |
12 |
4Y |
2I1 |
6 |
11 |
3I0 |
2Y |
7 |
10 |
3I1 |
GND |
8 |
9 |
3Y |
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures. |
File Number 1642.2 |
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Copyright © Harris Corporation 1997
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CD74HC157, CD74HCT157, CD74HC158, CD74HCT158
Description
The Harris CD74HC157, CD74HCT157, CD74HC158 and CD74HCT158 are quad 2-input multiplexers which select four bits of data from two sources under the control of a common Select input (S). The Enable input (E) is active Low. When (E) is High, all of the outputs in the 158, the inverting type, (1Y-4Y) are forced High and in the 157, the noninverting type, all of the outputs (1Y-4Y) are forced Low, regardless of all other input conditions.
Moving data from two groups of registers to four common output busses is a common use of these devices. The state of the Select input determines the particular register from which the data comes. They can also be used as function generators.
Ordering Information
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TEMP. RANGE (oC) |
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PKG. |
PART NUMBER |
PACKAGE |
NO. |
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CD74HC157E |
-55 to 125 |
16 Ld PDIP |
E16.3 |
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CD74HCT157E |
-55 to 125 |
16 Ld PDIP |
E16.3 |
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CD74HC158E |
-55 to 125 |
16 Ld PDIP |
E16.3 |
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CD74HCT158E |
-55 to 125 |
16 Ld PDIP |
E16.3 |
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CD74HC157M |
-55 to 125 |
16 Ld SOIC |
M16.15 |
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CD74HCT157M |
-55 to 125 |
16 Ld SOIC |
M16.15 |
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CD74HC158M |
-55 to 125 |
16 Ld SOIC |
M16.15 |
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NOTES: |
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1.When ordering, use the entire part number. Add the suffix 96 to obtain the variant in the tape and reel.
2.Wafer or die for this part number is available which meets all electrical specifications. Please contact your local sales office or Harris customer service for ordering information.
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CD74HC157, CD74HCT157, CD74HC158, CD74HCT158
Functional Diagram
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HC/HCT HC/HCT |
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157 |
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1I0 |
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4 |
1Y |
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1Y |
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1I1 |
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5 |
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2I0 |
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2Y |
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2Y |
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2I1 |
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11 |
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3I0 |
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3Y |
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10 |
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3Y |
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3I1 |
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14 |
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4I0 |
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12 |
4Y |
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13 |
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4Y |
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4I1 |
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1 |
15 |
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S |
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E |
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TRUTH TABLE
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SELECT |
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OUTPUT |
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ENABLE |
INPUT |
DATA INPUTS |
157 |
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158 |
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S |
I0 |
I1 |
Y |
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E |
Y |
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H |
X |
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L |
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H |
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L |
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L |
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H |
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H |
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H |
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L |
H |
X |
H |
H |
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L |
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NOTE: H = High Voltage Level, L = Low Voltage Level, X = Don’t Care
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