MOTOROLA MC74AC157, MC74ACT157 Technical data

5-1

FACT DATA

  

The MC74AC157/74ACT157 is a high-speed quad 2-input multiplexer. Four
bits of data from two sources can be selected using the common Select and Enable
inputs. The four outputs present the selected data in the true (noninverted) form.
The MC74AC157/74ACT157 can also be used as a function generator.

• Outputs Source/Sink 24 mA

• ′ACT157 Has TTL Compatible Inputs

1516 14 13 12 11 10

21 3 4 5 6 7

V

CC

9

8

E

I

0cI1cZcI0dI1dZd

S I

0aI1aZaI0bI1bZb

GND

PIN NAMES

I0a–I0dSource 0 Data Inputs
I1a–I1dSource 1 Data Inputs
E Enable Input
S Select Input
Za–ZdOutputs

TRUTH TABLE

Inputs Outputs

E S I

0I1

Z

H X X X L

L H X L L
L H X H H
L L L X L
L L H X H

H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial





QUAD 2-INPUT
MULTIPLEXER

N SUFFIX

CASE 648-08

PLASTIC

D SUFFIX

CASE 751B-05

PLASTIC

LOGIC SYMBOL

S

E I0aI1aI0bI

1b

Z

b

I0cI1cI0dI

1d

Z

a

Z

c

Z

d

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MC74AC157 MC74ACT157

5-2

FACT DATA

FUNCTIONAL DESCRIPTION

The MC74AC157/74ACT157 is a quad 2-input multiplexer.
It selects 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 (Z) are forced
LOW regardless of all other inputs. The MC74AC157/
74ACT157 is the logic implementation of a 4-pole, 2-position
switch where the position of the switch is determined by the
logic levels supplied to the Select input. The logic equations for
the outputs are shown below:

Za = E

•(I1a•S+I0a•S)

Zb = E

•(I1b•S+I0b•S)

Zc = E

•(I1c•S+I0c•S)

Zd = E

•(I1d•S+I0d•S)

A common use of the MC74AC157/74ACT157 is the
moving of data from two groups of registers to four common
output busses. The particular register from which the data
comes is determined by the state of the Select input. A less
obvious use is as a function generator. The MC74AC157/
74ACT157 can generate any four of the sixteen different
functions of two variables with one variable common. This is
useful for implementing gating functions.

LOGIC DIAGRAM

I

0a

I

1a

I

0b

I

1b

I

0c

I

1c

I

0d

I

1d

E S

Z

a

Please note that this diagram is provided only for the understanding of logic
operations and should not be used to estimate propagation delays.

Z

b

Z

c

Z

d

MAXIMUM RATINGS*

Symbol Parameter Value Unit

V

CC

DC Supply Voltage (Referenced to GND) –0.5 to +7.0 V

V

in

DC Input Voltage (Referenced to GND) –0.5 to VCC +0.5 V

V

out

DC Output Voltage (Referenced to GND) –0.5 to VCC +0.5 V

I

in

DC Input Current, per Pin ±20 mA

I

out

DC Output Sink/Source Current, per Pin ±50 mA

I

CC

DC VCC or GND Current per Output Pin ±50 mA

T

stg

Storage Temperature –65 to +150 °C

* Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended

Operating Conditions.

MC74AC157 MC74ACT157

5-3

FACT DATA

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Min Typ Max Unit

′AC 2.0 5.0 6.0

VCCSupply Voltage

′ACT 4.5 5.0 5.5

V

Vin, V

out

DC Input Voltage, Output Voltage (Ref. to GND) 0 V

CC

V

VCC @ 3.0 V 150

Input Rise and Fall Time (Note 1)
′AC Devices except Schmitt Inputs

VCC @ 4.5 V 40 ns/V

r

, t

f

′AC Devices except Schmitt Inputs

VCC @ 5.5 V 25
VCC @ 4.5 V 10

tr, t

f

Input Rise and Fall Time (Note 2)
′ACT Devices except Schmitt Inputs

VCC @ 5.5 V 8.0

ns/V

T

J

Junction Temperature (PDIP) 140 °C

T

A

Operating Ambient Temperature Range –40 25 85 °C

I

OH

Output Current — High –24 mA

I

OL

Output Current — Low 24 mA

1. Vin from 30% to 70% VCC; see individual Data Sheets for devices that differ from the typical input rise and fall times.

2. Vin from 0.8 V to 2.0 V; see individual Data Sheets for devices that differ from the typical input rise and fall times.

DC CHARACTERISTICS

74AC 74AC

Symbol

Parameter

V

CC

(V)

TA = +25°C

TA =

–40°C to +85°C

Unit

Conditions

Typ Guaranteed Limits

V

IH

3.0 1.5 2.1 2.1 V

OUT

= 0.1 V

4.5 2.25 3.15 3.15 V or VCC – 0.1 V

5.5 2.75 3.85 3.85

V

IL

3.0 1.5 0.9 0.9 V

OUT

= 0.1 V

4.5 2.25 1.35 1.35 V or VCC – 0.1 V

5.5 2.75 1.65 1.65

V

OH

3.0 2.99 2.9 2.9 I

OUT

= –50 µA

4.5 4.49 4.4 4.4 V

5.5 5.49 5.4 5.4
*VIN = VIL or V

IH

3.0 2.56 2.46

–12 mA

4.5 3.86 3.76

V

I

OH

–24 mA

5.5 4.86 4.76 –24 mA

V

OL

3.0 0.002 0.1 0.1 I

OUT

= 50 µA

4.5 0.001 0.1 0.1 V

5.5 0.001 0.1 0.1
*VIN = VIL or V

IH

3.0 0.36 0.44

12 mA

4.5 0.36 0.44

V

I

OL

24 mA

5.5 0.36 0.44 24 mA

I

IN

5.5

±0.1

±1.0

µA

VI = VCC, GND

I

OLD

5.5 75 mA V

OLD

= 1.65 V Max

I

OHD

Output Current

5.5 –75 mA V

OHD

= 3.85 V Min

I

CC

5.5

8.080µA

VIN = VCC or GND

* All outputs loaded; thresholds on input associated with output under test.
†Maximum test duration 2.0 ms, one output loaded at a time.
Note: IIN and ICC @ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V VCC.

tr, t

f

Input Rise and Fall Time (Note 2)

Minimum High Level
Input Voltage

Maximum Low Level
Input Voltage

Minimum High Level
Output Voltage

Maximum Low Level
Output Voltage

Maximum Input
Leakage Current

†Minimum Dynamic

Maximum Quiescent
Supply Current

MC74AC157 MC74ACT157

5-4

FACT DATA

AC CHARACTERISTICS (For Figures and Waveforms — See Section 3)

74AC 74AC

Symbol

Parameter

VCC*

(V)

TA = +25°C
CL = 50 pF

TA = –40°C

to +85°C

CL = 50 pF

Unit

Fig.

No.

Min Typ Max Min Max

3.3 1.5 7.0 11.5 1.5 13.0

t

PLH

5.0 1.5 5.5 9.0 1.5 10.0

ns

3-6

3.3 1.5 6.5 11.0 1.5 12.0

t

PHL

5.0 1.5 5.0 8.5 1.0 9.5

ns

3-6

3.3 1.5 7.0 11.5 1.5 13.0

t

PLH

to Z

n

5.0 1.5 5.5 9.0 1.5 10.0

ns

3-6

3.3 1.5 6.5 11.0 1.5 12

t

PHL

n

to Z

n

5.0 1.5 5.5 9.0 1.0 9.5

ns

3-6

3.3 1.5 5.0 8.5 1.0 9.0

t

PLH

5.0 1.5 4.0 6.5 1.0 7.0

ns

3-5

3.3 1.5 5.0 8.0 1.0 9.0

t

PHL

5.0 1.5 4.0 6.5 1.0 7.0

ns

3-5

* Voltage Range 3.3 V is 3.3 V ±0.3 V.

Voltage Range 5.0 V is 5.0 V ±0.5 V.

DC CHARACTERISTICS

74ACT 74ACT

Symbol

Parameter

V

CC

(V)

TA = +25°C

TA =

–40°C to +85°C

Unit

Conditions

Typ Guaranteed Limits

V

IH

4.5 1.5 2.0 2.0

V

OUT

= 0.1 V

5.5 1.5 2.0 2.0

V

or VCC – 0.1 V

V

IL

4.5 1.5 0.8 0.8

V

OUT

= 0.1 V

5.5 1.5 0.8 0.8

V

or VCC – 0.1 V

V

OH

4.5 4.49 4.4 4.4

I

OUT

= –50 µA

5.5 5.49 5.4 5.4

V

*VIN = VIL or V

IH

4.5 3.86 3.76 V

–24 mA

5.5 4.86 4.76

I

OH

–24 mA

V

OL

4.5 0.001 0.1 0.1

I

OUT

= 50 µA

5.5 0.001 0.1 0.1

V

*VIN = VIL or V

IH

4.5 0.36 0.44 V

24 mA

5.5 0.36 0.44

I

OL

24 mA

I

IN

5.5

±0.1

±1.0

µA

VI = VCC, GND

∆I

CCT

Additional Max. ICC/Input 5.5 0.6 1.5 mA VI = VCC – 2.1 V

I

OLD

5.5 75 mA V

OLD

= 1.65 V Max

I

OHD

Output Current

5.5 –75 mA V

OHD

= 3.85 V Min

I

CC

5.5

8.080µA

VIN = VCC or GND

* All outputs loaded; thresholds on input associated with output under test.
†Maximum test duration 2.0 ms, one output loaded at a time.

Propagation Delay
S to Z

n

Propagation Delay
S to Z

n

Propagation Delay
E

Propagation Delay
E

Propagation Delay
In to Z

n

Propagation Delay
In to Z

n

Minimum High Level
Input Voltage

Maximum Low Level
Input Voltage

Minimum High Level
Output Voltage

Maximum Low Level
Output Voltage

Maximum Input
Leakage Current

†Minimum Dynamic

Maximum Quiescent
Supply Current

MC74AC157 MC74ACT157

5-5

FACT DATA

AC CHARACTERISTICS (For Figures and Waveforms — See Section 3)

74ACT 74ACT

Symbol

Parameter

VCC*

(V)

TA = +25°C
CL = 50 pF

TA = –40°C

to +85°C

CL = 50 pF

Unit

Fig.

No.

Min Typ Max Min Max

t

PLH

5.0

2.0

9.0

1.5

10.0ns3-6

t

PHL

5.0

2.0

9.5

2.0

10.5ns3-6

t

PLH

n

to Z

n

5.0

1.5101.5

11.5ns3-6

t

PHL

n

to Z

n

5.0

1.5

8.5

1.0

9.0ns3-6

t

PLH

5.0

1.5

7.0

1.0

8.5ns3-5

t

PHL

5.0

1.5

7.5

1.0

8.5ns3-5

* Voltage Range 5.0 V is 5.0 V ±0.5 V.

CAPACITANCE

Symbol Parameter

Value

Typ

Unit Test Conditions

C

IN

Input Capacitance 4.5 pF VCC = 5.0 V

C

PD

Power Dissipation Capacitance 50 pF VCC = 5.0 V

Propagation Delay
S to Z

n

Propagation Delay
S to Z

n

Propagation Delay
E

Propagation Delay
E

Propagation Delay
In to Z

n

Propagation Delay
In to Z

n

MC74AC157 MC74ACT157

5-6

FACT DATA

OUTLINE DIMENSIONS

N SUFFIX

PLASTIC DIP PACKAGE

CASE 648–08

ISSUE R

D SUFFIX

PLASTIC SOIC PACKAGE

CASE 751B–05

ISSUE J

NOTES:

1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.

2. CONTROLLING DIMENSION: MILLIMETER.

3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.

4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.

5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.

1 8

16 9

SEATING

PLANE

F

J

M

R

X 45

_

G

8 PLP

–B–

–A–

M

0.25 (0.010) B

S

–T–

D

K

C

16 PL

S

B

M

0.25 (0.010) A

S

T

DIM MIN MAX MIN MAX

INCHESMILLIMETERS

A 9.80 10.00 0.386 0.393
B 3.80 4.00 0.150 0.157
C 1.35 1.75 0.054 0.068
D 0.35 0.49 0.014 0.019

F 0.40 1.25 0.016 0.049

G 1.27 BSC 0.050 BSC

J 0.19 0.25 0.008 0.009
K 0.10 0.25 0.004 0.009
M 0 7 0 7
P 5.80 6.20 0.229 0.244
R 0.25 0.50 0.010 0.019

_ _ _ _

NOTES:

1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.

2. CONTROLLING DIMENSION: INCH.

3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.

4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.

5. ROUNDED CORNERS OPTIONAL.

–A–

B

F

C

S

H

G

D

J

L

M

16 PL

SEATING

1 8

916

K

PLANE

–T–

M

A

M

0.25 (0.010) T

DIM MIN MAX MIN MAX

MILLIMETERSINCHES

A 0.740 0.770 18.80 19.55
B 0.250 0.270 6.35 6.85
C 0.145 0.175 3.69 4.44
D 0.015 0.021 0.39 0.53
F 0.040 0.70 1.02 1.77
G 0.100 BSC 2.54 BSC
H 0.050 BSC 1.27 BSC
J 0.008 0.015 0.21 0.38
K 0.110 0.130 2.80 3.30
L 0.295 0.305 7.50 7.74
M 0 10 0 10
S 0.020 0.040 0.51 1.01

____

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MC74AC157/D

*MC74AC157/D*

◊