74AC157SC - Fairchild - Datasheet.Live

November 1988

Revised November 1999

74AC157 • 74ACT157 Quad 2-Input Multiplexer

74AC157 • 74ACT157

Quad 2-Input Multiplexer

General Description

The AC/A CT157 is a high-speed qu ad 2-input multiplex er.

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 AC/ACT157 can also be used as a function generator.

Features

■ICC and IOZ reduced by 50%

■Outputs source/sink 24 mA

■ACT157 has TTL-compatible inputs

Ordering Code:

Device a ls o av ailable in Tape and R eel. Spe c ify by appending suffix let te r “X” to the ordering co de.

Logic Symbols

IEEE/IEC

Connection Diagram

Pin Descriptions

FACT is a trademark of Fairchild Semiconductor Corporation.

Order Number Package Number Package Description

74AC157SC M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow Body

74AC157SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

74AC157MTC MTC16 16 -Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

74AC157PC N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide

74ACT157SC M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow Body

74ACT157SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

74ACT157MTC MTC16 16 -Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

74ACT157PC N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide

Pin Names Description

I0a–I0d Source 0 Data Inputs

I1a–I1d Source 1 Data Inputs

EEnable Input

S Select Input

Za–ZdOutputs

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74AC157 • 74ACT157

Functional Description

The AC/ACT157 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 regar dless of al l other in puts. The AC/A CT15 7 is the

logic implementation of a 4-pole, 2-position switch where

the posi tion of the swit ch is determined b y the logic levels

supplied to the Select input. The logic equations for the

outputs are shown bel o w:

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 AC/ACT157 is the moving of data

from two groups of registers to four common output bus-

ses. The particular register from which the data comes is

determ ined by th e state o f the S elect inpu t. A less o bvious

use is as a func tion gene rator. The AC/ACT 15 7 can ge ner -

ate any four of the sixteen different functions of two vari-

ables with one variable common. This is useful for

implementing gating functions.

Truth Table

H = HIGH Voltage Lev el

L = LOW Voltage Level

X = Immaterial

Logic Diagram

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

Inputs Outputs

ESI

0I1Z

HX X X L

LH X L L

LH X H H

LL L X L

LLH X H

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74AC157 • 74ACT157

Absolute Maximum Ratings(Note 1) Recommended Operating

Conditions

Note 1: Absol ut e maximum r atings a re those va lues bey ond which damage

to the dev ice may occ ur. The databoo k specific ations sh ould be m et, with-

out exc eption, to e nsure that the system des ign is reliable over its power

supply, temperature, and output/input loading variables. Fairchild does not

recommend operation of FACT circuits ou tside dat abook spe c if ic at ions.

DC Electrical Characteristics for AC

Note 2: All outputs lo aded; thre sholds on input as s oc iated with outpu t un der test.

Note 3: Maximum test durati on 2.0 ms, one output loaded at a time.

Note 4: IIN and ICC @ 3.0V are gu aranteed to be less t han or equa l t o th e respectiv e limit @ 5.5V VCC.

Supply Voltage (VCC) −0.5V to +7.0V

DC Input Diode Current (IIK)

I = −0.5V −20 mA

I = VCC + 0.5V +20 mA

DC Input Vo ltage (VI) −0.5V to VCC + 0.5V

DC Output Diode Current (IOK)

O = −0.5V −20 mA

O = VCC + 0.5V +20 mA

DC Output Voltage (VO) −0.5V to VCC + 0.5V

DC Output Source

or Sink Current (IO) ±50 mA

DC VCC or Ground Curre nt

per Output Pin (ICC or IGND) ±50 mA

Storage Temperature (TSTG) −65°C to +150°C

Junction Temperature (TJ)

PDIP 140°C

Supply Voltage (VCC)

AC 2.0V to 6.0V

ACT 4.5V to 5.5V

Input Voltage (VI) 0V to VCC

Output Voltage (VO) 0V to VCC

Operating Temperature (TA) −40°C to +85°C

Minimum Input Edge Rate (∆V/∆t)

AC Devices

IN from 30% to 70% of VCC

CC @ 3.3V, 4.5V, 5.5V 125 mV/ns

Minimum Input Edge Rate (∆V/∆t)

ACT Devices

IN from 0.8V to 2.0V

CC @ 4.5V, 5.5V 125 mV/ns

Symbol Parameter VCC TA = +25°C T

A = −40°C to +85°CUnits Conditions

(V) Typ Guaranteed Limits

VIH Minimum HIGH Level 3.0 1.5 2.1 2.1 VOUT = 0.1V

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

5.5 2.75 3.85 3.85

VIL Maximum LOW Level 3.0 1.5 0.9 0.9 VOUT = 0.1V

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

5.5 2.75 1.65 1.65

VOH Minimum HIGH Level 3.0 2.99 2.9 2.9

Output Voltage 4.5 4.49 4.4 4.4 V IOUT = −50 µA

5.5 5.49 5.4 5.4 VIN = VIL or VIH

3.0 2.56 2.46 IOH = −12 mA

4.5 3.86 3.76 V IOH = −24 mA

5.5 4.86 4.76 IOH = −24 mA (Note 2)

VOL Maximum LOW Level 3.0 0.002 0.1 0.1

Output Voltage 4.5 0.001 0.1 0.1 V IOUT = 50 µA

5.5 0.001 0.1 0.1 VIN = VIL or VIH

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)

IIN Maximum Input 5.5 ±0.1 ±1.0 µA V

I = VCC, GND

(Note 4) Leakage Curr ent

IOLD Minimum Dynamic 5.5 75 mA VOLD = 1.65V Max

IOHD Output Current (Note 3) 5.5 −75 mA VOHD = 3.85V Min

ICC Maximum Quiescent 5.5 4.0 40.0 µA VIN = VCC

(Note 4) Supply Current or GND

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74AC157 • 74ACT157

DC Characteristics for ACT

Note 5: All outputs loaded; th resholds on input associate d w it h output under tes t.

Note 6: Maximum test du ration 2.0 m s, one out put loaded a t a tim e.

AC Electrical Characteristics for AC

Note 7: Voltage Range 3.3 is 3.3V ± 0.3V

Voltage Range 5. 0 is 5. 0V ± 0.5V

Symbol Parameter VCC TA = +25°C T

A = −40°C to +85°CUnits Conditions

(V) Typ Guaranteed Limits

VIH Minimum HIGH Level 4.5 1.5 2.0 2.0 V VOUT = 0.1V

Input Voltage 5.5 1.5 2.0 2.0 or VCC − 0.1V

VIL Maximum LOW Level 4.5 1.5 0.8 0.8 V VOUT = 0.1V

Input Voltage 5.5 1.5 0.8 0.8 or VCC − 0.1V

VOH Minimum HIGH Level 4.5 4.49 4.4 4.4 V I

OUT = −50 µA

Output Voltage 5.5 5.49 5.4 5.4 VIN = VIL or VIH

4.5 3.86 3.76 V IOH = −24 mA

5.5 4.86 4.76 IOH = −24 mA (Note 5)

VOL Maximum LOW Level 4.5 0.001 0.1 0.1 V I

OUT = 50 µA

Output Voltage 5.5 0.001 0.1 0.1 VIN = VIL or VIH

4.5 0.36 0.44 V IOL = 24 mA

5.5 0.36 0.44 IOL = 24 mA (Note 5)

IIN Maximum Input 5.5 ±0.1 ±1.0 µA V

I = VCC, GND

Leakage Current

ICCT Maximum 5.5 0.6 1.5 mA VI = VCC − 2.1V

ICC/Input

IOLD Minimum Dynamic 5.5 75 mA VOLD = 1.65V Max

IOHD Output Current (Note 6) 5.5 −75 mA VOHD = 3.85V Min

ICC Maximum Quiescent 5.5 4.0 40.0 µA VIN = VCC

Supply Current or GND

VCC TA = +25°CT

A = −40°C to +85°C

Symbol Parameter (V) CL = 50 pF CL = 50 pF Units

(Note 7) Min Typ Max Min Max

tPLH Propagation Delay 3.3 1.5 7.0 11.5 1.5 13.0 ns

S to Zn5.0 1.5 5.5 9.0 1.5 10.0

tPHL Propagation Delay 3.3 1.5 6.5 11.0 1.5 12.0 ns

S to Zn5.01.55.08.51.09.5

tPLH Propagation Delay 3.3 1.5 7.0 11.5 1.5 13.0 ns

E to Zn5.0 1.5 5.5 9.0 1.5 10.0

tPHL Propagation Delay 3.3 1.5 6.5 11.0 1.5 12.0 ns

E to Zn5.01.55.59.01.09.5

tPLH Propagation Delay 3.3 1.5 5.0 8.5 1.0 9.0 ns

In to Zn5.01.54.06.51.07.0

tPHL Propagation Delay 3.3 1.5 5.0 8.0 1.0 9.0 ns

In to Zn5.01.54.06.51.07.0

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74AC157 • 74ACT157

AC Electrical Characteristics for ACT

Note 8: Volt age Range 5.0 is 5.0V ± 0.5V

Capacitance

VCC TA = +25°CT

A = −40°C to +85°C

Symbol Parameter (V) CL = 50 pF CL = 50 pF Units

(Note 8) Min Typ Max Min Max

tPLH Propagation Delay 5.0 2.0 5.5 9.0 1.5 10.0 ns

S to Zn

tPHL Propagation Delay 5.0 2.0 5.5 9.5 2.0 10.5 ns

S to Zn

tPLH Propagation Delay 5.0 1.5 6.0 10.0 1.5 11.5 ns

E to Zn

tPHL Propagation Delay 5.0 1.5 5.0 8.5 1.0 9.0 ns

E to Zn

tPLH Propagation Delay 5.0 1.5 4.0 7.0 1.0 8.5 ns

In to Zn

tPHL Propagation Delay 5.0 1.5 4.5 7.5 1.0 8.5 ns

In to Zn

Symbol Parameter Typ Units Conditions

CIN Input Capacitance 4.5 pF VCC = OPEN

CPD Power Dissipation Capacitance 50.0 pF VCC = 5.0V

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74AC157 • 74ACT157

Physical Dimensions inches (millimeters) unless otherwise noted

16-Lead Small Out line Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow Body

Package Number M16A

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74AC157 • 74ACT157

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

Package Number M16D

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74AC157 • 74ACT157

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

16- Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Package Number MTC16

9 www.fairchildsemi.com

74AC157 • 74ACT157 Quad 2-Input Multiplexer

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

16-L ead Plastic Dual-In-Line Package (PDIP ), JEDEC MS-001, 0.300” Wide

Package Number N16E

Fairchild does not assume an y responsibility for u se of any circuitry descr ibed, no circuit pat ent licenses are implied and

Fairchild reserves the right at any time without notice to change said circuitry and specifications.

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to perform when properly used in accordance with

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sonably expected to result in a significant injury to the

user.

2. A c ritica l compo nent i n any compo nent o f a li fe supp ort

device or system whose failure to perform can be rea-

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device or system, or to affect its safety or effectiveness.