Datasheet MC74F253D, MC74F253N, MC54F253J Datasheet (Motorola)

4-120

FAST AND LS TTL DATA

DUAL 4-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS

The MC54/74F253 is a Dual 4-Input Multiplexer with 3-State Outputs. It can
select two bits of data from four sources using common select inputs. The out­puts may be individually switched to a high-impedance state with a HIGH on
the respective Output Enable (OE

) inputs, allowing the outputs to interface di-

rectly with bus-oriented systems.

1516 14 13 12 11 10

21 3 4 5 6 7

V

CC

9

8

OE

b

GND

S0I

3bI2bI1bI0bZb

OE

aS1I3aI2aI1aI0aZa

CONNECTION DIAGRAM DIP (TOP VIEW)

GUARANTEED OPERATING RANGES

Symbol Parameter Min Typ Max Unit

V

CC

Supply Voltage 54, 74 4.5 5.0 5.5 V

T

A

Operating Ambient Temperature Range 54 –55 25 125 °C

74 0 25 70

I

OH

Output Current — High 54, 74 –3.0 mA

I

OL

Output Current — Low 54, 74 24 mA

FAST SCHOTTKY TTL

DUAL 4-INPUT MULTIPLEXER

WITH 3-STATE OUTPUTS

MC54/74F253

J SUFFIX

CERAMIC

CASE 620-09

N SUFFIX

PLASTIC

CASE 648-08

16

1

16

1

ORDERING INFORMATION

MC54FXXXJ Ceramic
MC74FXXXN Plastic
MC74FXXXD SOIC

16

1

D SUFFIX

SOIC

CASE 751B-03

H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High Impedance (off)
Address inputs S0 and S1
are common to both sections.

4-121

FAST AND LS TTL DATA

MC54/74F253

9 7

16210 1411

LOGIC DIAGRAM

OE

b

1

3b

1

2b

1

1b

1

0b

S

0

S

1

1

3a

1

2a

1

1a

1

0a

OE

a

Z

a

Z

b

VCC = PIN 16
GND = PIN 8
= PIN NUMBERS

3 4 5121315

FUNCTIONAL DESCRIPTION

The F253 contains two identical 4-input Multiplexers with
3-State Outputs. They select two bits from four sources se­lected by common Select Inputs (S0, S1). The 4-input multi­plexers have individual Output Enable (OE

a

, OEb) inputs
which, when HIGH, force the outputs to a high impedance
(high Z) state.

The F253 is the logic implementation of a 2-pole, 4-position
switch, where the position of the switch is determined by the
logic levels supplied to the two select inputs. The logic equa­tions for the outputs are shown below:

Za = OE

a

• (I0a • S1 • S0 + I1a • S1 • S0 +
I2a • S1 • S

0

+ 13a • S1 • S0)

Zb = OE

b

• (I0b • S1 • S0 + I1b • S1 • S0 +

I2b • S1 • S

0

+ I3b • S1 • S0)

If the outputs of 3-state devices are tied together, all but one
device must be in the high impedance state to avoid high cur­rents that would exceed the maximum ratings. Designers
should ensure that Output Enable signals to 3-state devices
whose outputs are tied together are designed so that there is
no overlap.

FUNCTION TABLE

Select
Inputs

Data Inputs

Output
Enable

Output

S

0

S

1

I

0

I

1

I

2

I

3

OE Z

X X X X X X H Z
L L L X X X L L
L L H X X X L H
H L X L X X L L
H L X H X X L H
L H X X L X L L
L H X X H X L H
H H X X X L L L
H H X X X H L H

4-122

FAST AND LS TTL DATA

MC54/74F253

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

Limits

Symbol Parameter Min Typ Max Unit Test Conditions

V

IH

Input HIGH Voltage 2.0 V Guaranteed Input HIGH Voltage

V

IL

Input LOW Voltage 0.8 V Guaranteed Input LOW Voltage

V

IK

Input Clamp Diode Voltage –1.2 V IIN = –18 mA VCC = MIN

V

OH

Output HIGH Voltage 54, 74 2.4 V IOH = –3.0 mA VCC = 4.50 V

74 2.7 V IOH = –3.0 mA VCC = 4.75 V

V

OL

Output LOW Voltage 0.5 V IOL = 24 mA VCC = MIN

I

OZH

Output Off Current — HIGH 50 µA V

OUT

= 2.7 V VCC = MAX

I

OZL

Output Off Current — LOW –50 µA V

OUT

= 0.5 V VCC = MAX

I

IH

Input HIGH Current 20 µA VIN = 2.7 V VCC = MAX

100 µA VIN = 7.0 V

I

IL

Input LOW Current –0.6 mA VIN = 0.5 V VCC = MAX

I

OS

Output Short Circuit

Current (Note 2)

–60 –150 mA V

OUT

= 0 V VCC = MAX

Power Supply Current OEn = GND

Total, Output HIGH 16 IO = 4.5 V; Sn, I1 – I3 = GND

I

CC

Total, Output LOW 23 mA In, Sn, OEn = GND

VCC = MAX

Total at HIGH-Z 23 OEn = 4.5 V, VCC = MAX

In, Sn = GND

AC CHARACTERISTICS

54/74F 54F 74F

TA = +25°C TA = -55°C to +125°C TA = 0°C to +70°C

VCC = +5.0 V VCC = 5.0 V ± 10% VCC = 5.0 V ± 10%

CL = 50 pF CL = 50 pF CL = 50 pF

Symbol Parameter Min Max Min Max Min Max Unit

t

PLH

Propagation Delay 4.5 11.5 3.5 15 4.5 13.5 ns

t

PHL

Sn to Z

n

3.0 9.0 2.5 11 3.0 10

t

PLH

Propagation Delay 3.0 7.0 2.5 9.0 3.0 8.0 ns

t

PHL

In to Z

n

2.5 6.0 2.5 8.0 2.5 7.0

t

PZH

Output Enable Time 3.0 8.0 2.5 10 3.0 9.0 ns

t

PZL

3.0 8.0 2.5 10 3.0 9.0

t

PHZ

Output Disable Time 2.0 5.0 2.0 6.5 2.0 6.0 ns

t

PLZ

2.0 6.0 2.0 8.0 2.0 7.0