Fairchild 74AC151 service manual

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74AC151 • 74ACT151
8-Input Multiplexer

74AC151 • 74ACT151 8-Input Multiplexer

November 1988
Revised November 1999

General Description

The AC/ACT151 is a high-speed 8-input digi t al multiplexer.
It provides, in one package, the ability to select o ne line of
data from up to eight sources. The AC/ACT151 can be
used as a universal function generator to generate any
logic function of four variable s. Both true and compl emen­tary outputs are provided.

Features

■ ICC reduced by 50%

■ Outputs source/sink 24 mA

■ ACT151 has TTL-compatible inputs

Ordering Code:

Order Number Package Number Package Description

74AC151SC M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow Body
74AC151SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74AC151MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74AC151PC N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
74ACT151SC M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow Body
74ACT151SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74ACT151PC N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide

Device also available in Tape and Reel. Specify by appending suffix letter “X” to the or dering code.

Logic Symbols

IEEE/IEC

Connection Diagram

Pin Descriptions

Pin Names Description

I

0–I7

S

0–S2

E
Z Data Output
Z

FACT is a trademark of Fairchild Semiconductor Corporation.

© 1999 Fairchild Semiconductor Corporation DS009927 www.fairchildsemi.com

Data Inputs
Select Inputs
Enable Input

Inverted Data Output

Truth Table

Inputs Outputs

S

E

S

2

S

1

0

Z Z

H X X X H L
L L L L I
L L L H I1 I
L L H L I2 I

74AC151 • 74ACT151

L L H H I3 I
L H L L I4 I
L H L H I5 I
L H H L I6 I
L H H H I7 I

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

Logic Diagram

Functional Description

The AC/ACT151 is a logic imple mentat ion of a sing le pole,
8-position switch with the switch pos ition controlle d by the
state of three Select inp uts, S

plementary outputs are provided. The En able input (E
active LOW. When it is not activa ted, the complementary
output is HIGH and the true output is LOW regardless of all

I

0

0

other inputs. The logic function provided at the output is:

1
2
3
4
5
6
7

Z = E

• (I0 • S0 • S1 • S2 + I1 • S0 • S1 • S2 +

• S0 • S1 • S2 + I3 • S0 • S1 • S2 + I4 • S0 • S1 • S2 + I5 •

I

2

• S1 • S2 + I6 • S0 • S1 • S2 + I 7 • S0 • S1 • S2)

S

0

The AC/ACT151 provides the ability, in one package, to
select from eight sources of data or con trol info rmatio n. By
proper manipulation of the inputs, the AC/ACT151 can pro­vide any logic function of four variables and its comple­ment.

, S1, S2. Both true and com-

0

) is

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

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Absolute Maximum Ratings(Note 1) Recommended Operating

Supply Voltage (VCC) −0.5V to +7.0V
DC Input Diode Current (I

V

= −0.5V −20 mA

I

= VCC + 0.5V +20 mA

V

I

DC Input Voltage (V
DC Output Diode Current (I

= −0.5V −20 mA

V

O

V

= VCC + 0.5V +20 mA

O

DC Output Voltage (V

)

IK

) −0.5V to VCC + 0.5V

I

)

OK

) −0.5V to VCC + 0.5V

O

DC Output Source

or Sink Current (I

DC V

or Ground Current

CC

per Output Pin (I
Storage Temperature (T
Junction Temperature (T

) ±50 mA

O

or I

CC

) ±50 mA

GND

) −65°C to +150°C

STG

)

J

PDIP 140°C

Conditions

Supply Voltage (V

AC 2.0V to 6.0V

ACT 4.5V to 5.5V
Input Voltage (V
Output Voltage (VO) 0V to V
Operating Temperature (TA) −40°C to +85°C
Minimum Input Edge Rate (∆V/∆t)

AC Devices

V

from 30% to 70% of V

IN

VCC @ 3.3V, 4.5V, 5.5V 125 mV/ns
Minimum Input Edge Rate (∆V/∆t)

ACT Devices

V

from 0.8V to 2.0V

IN

@ 4.5V, 5.5V 125 mV/ns

V

CC

Note 1: Absolute max imum ratings are those va lues beyond which damage
to the device may occu r. The databook spe cificatio ns shou ld be met, w ith­out exception, to ensure that the system de sign is relia ble over its p ower
supply, temperature, and output/input loading variables. Fairchild does not
recommend operation of FACT circuits outside databook specif ic at ions.

)

CC

) 0V to V

I

CC

DC Electrical Characteristics for AC

V

Symbol Parameter

V

V

V

V

I

IN

(Note 4)
I

OLD

I

OHD

I

CC

(Note 4)

Note 2: All outputs loaded; thres holds on input associated with output under test.
Note 3: Maximum test duration 2.0 ms, one output loaded at a time.
Note 4: I

Minimum HIGH Level 3.0 1.5 2.1 2.1 V

IH

Input Voltage 4.5 2.25 3.15 3.15 V or VCC − 0.1V

Maximum LOW Level 3.0 1.5 0.9 0.9 V

IL

Input Voltage 4.5 2.25 1.35 1.35 V or VCC − 0.1V

Minimum HIGH Level 3.0 2.99 2.9 2.9

OH

Output Voltage 4.5 4.49 4.4 4.4 V I

Maximum LOW Level 3.0 0.002 0.1 0.1

OL

Output Voltage 4.5 0.001 0.1 0.1 V I

Maximum Input
Leakage Current

Minimum Dynamic 5.5 75 mA V
Output Current (Note 3) 5.5 −75 mA V
Maximum Quiescent

Supply Current

and ICC @ 3.0V are guaranteed to be less than or e qual to the respective lim it @ 5. 5V VCC.

IN

CC

(V) Typ Guaranteed Limits

5.5 2.75 3.85 3.85

5.5 2.75 1.65 1.65

5.5 5.49 5.4 5.4

3.0 2.56 2.46 IOH = −12 mA

4.5 3.86 3.76 V I

5.5 4.86 4.76 I

5.5 0.001 0.1 0.1

3.0 0.36 0.44 IOL = 12 mA

4.5 0.36 0.44 V IOL = 24 mA

5.5 0.36 0.44 IOL = 24 mA (Note 2)

5.5 ±0.1 ±1.0 µA VI = VCC, GND

5.5 4.0 40.0 µAVIN = VCC or GND

TA = +25°C T

= −40°C to +85°C

A

Units Conditions

= 0.1V

OUT

= 0.1V

OUT

= −50 µA

OUT

VIN = V

or V

IL

= −24 mA

OH

= −24 mA(Note 2)

OH

= 50 µA

OUT

VIN = VIL or V

= 1.65V Max

OLD

= 3.85V Min

OHD

74AC151 • 74ACT151

CC
CC

IH

IH

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