74VHC157MTCX - Fairchild Semiconductor

tm

74VHC157 Quad 2-Input Multiplexer

May 2007

74VHC157 Rev. 1.2

74VHC157

Quad 2-Input Multiplexer

Features

■

High Speed: t

PD

=

4.1ns (Typ.) at V

CC

=

5V

■

Low power dissipation: I

CC

=

4µA (Max.) at T

A

=

25°C

■

High noise immunity: V

NIH

=

V

NIL

=

28% V

CC

(Min.)

■

Power down protection is provided on all inputs

■

Low noise: V

OLP

=

0.8V (Max.)

■

Pin and function compatible with 74HC157

General Description

The VHC157 is an advanced high speed CMOS Quad

2-Channel Multiplexer fabricated with silicon gate CMOS

technology. It achieves the high speed operation similar

to equivalent Bipolar Schottky TTL while maintaining the

CMOS low power dissipation.

It consists of four 2-input digital multiplexers with com-

mon select and enable inputs. When the ENABLE input

is held “H” level, selection of data is inhibited and all the

outputs become “L” level. The SELECT decoding deter-

mines whether the I

0x

or I

1x

inputs get routed to their cor-

responding outputs.

An Input protection circuit ensures that 0V to 7V can be

applied to the input pins without regard to the supply

voltage. This device can be used to interface 5V to 3V

systems and on two supply systems such as battery

back up. This circuit prevents device destruction due to

mismatched supply and input voltages.

Ordering Information

Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the

ordering number.

Connection Diagram Pin Description

Order Number

Package

Number Package Description

74VHC157M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150”

Narrow

74VHC157SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

74VHC157MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153,

4.4mm Wide

Pin Names Description

I

0a

–I

0d

Source 0 Data Inputs

I

1a

–I

1d

Source 1 Data Inputs

EEnable Input

S Select Input

Z

a

–Z

d

Outputs

74VHC157 Quad 2-Input Multiplexer

74VHC157 Rev. 1.2 2

Logic Symbols

IEEE/IEC

Truth Table

H

=

HIGH Voltage Level

L

=

LOW Voltage Level

X

=

Immaterial

Functional Description

The VHC157 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 VHC157 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:

Z

a

=

E • (I

1a

• S + I

0a

• S)

Z

b

=

E • (I

1b

• S + I

0b

• S)

Z

c

=

E • (I

1c

• S + I

0c

• S)

Z

d

=

E • (I

1d

• S + I

0d

• S)

A common use of the VHC157 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 obvi-

ous use is as a function generator. The VHC157 can

generate any four of the sixteen different functions of two

variables with one variable common. This is useful for

implementing gating functions.

Inputs Outputs

ESI

0

I

1

Z

HX X X L

LH X L L

LH X H H

LL L X L

LL H X H

74VHC157 Quad 2-Input Multiplexer

74VHC157 Rev. 1.2 3

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.

74VHC157 Quad 2-Input Multiplexer

74VHC157 Rev. 1.2 4

Absolute Maximum Ratings

Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be

operable above the recommended operating conditions and stressing the parts to these levels is not recommended.

In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.

The absolute maximum ratings are stress ratings only.

Recommended Operating Conditions

(1)

The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended

operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not

recommend exceeding them or designing to absolute maximum ratings.

Note:

1. Unused inputs must be held HIGH or LOW. They may not float.

Symbol Parameter Rating

V

CC

Supply Voltage –0.5V to +7.0V

V

IN

DC Input Voltage –0.5V to +7.0V

V

OUT

DC Output Voltage –0.5V to V

CC

+ 0.5V

I

IK

Input Diode Current –20mA

I

OK

Output Diode Current ±20mA

I

OUT

DC Output Current ±25mA

I

CC

DC V

CC

/ GND Current ±50mA

T

STG

Storage Temperature –65°C to +150°C

T

L

Lead Temperature (Soldering, 10 seconds) 260°C

Symbol Parameter Rating

V

CC

Supply Voltage 2.0V to +5.5V

V

IN

Input Voltage 0V to +5.5V

V

OUT

Output Voltage 0V to V

CC

T

OPR

Operating Temperature –40°C to +85°C

t

r

, t

f

Input Rise and Fall Time,

V

CC

=

3.3V ± 0.3V

V

CC

=

5.0V ± 0.5V

0ns/V

∼

100ns/V

0ns/V

∼

20ns/V

74VHC157 Quad 2-Input Multiplexer

74VHC157 Rev. 1.2 5

DC Electrical Characteristics

Noise Characteristics

Note:

2. Parameter guaranteed by design.

Symbol Parameter V

CC

(V) Conditions

T

A

=

25°C

T

A

=

–40°C to

+85°C

UnitsMin. Typ. Max. Min. Max.

V

IH

HIGH Level Input

Voltage

2.0 1.50 1.50 V

3.0–5.5 0.7 x V

CC

0.7 x V

CC

V

IL

LOW Level Input

Voltage

2.0 0.50 0.50 V

3.0–5.5 0.3 x V

CC

0.3 x V

CC

V

OH

HIGH Level

Output Voltage

2.0 V

IN

=

V

IH

or V

IL

I

OH

=

–50µA 1.9 2.0 1.9 V

3.0 2.9 3.0 2.9

4.5 4.4 4.5 4.4

3.0 I

OH

=

–4mA 2.58 2.48

4.5 I

OH

=

–8mA 3.94 3.80

V

OL

LOW Level

Output Voltage

2.0 V

IN

=

V

IH

or V

IL

I

OL

=

50µA 0.0 0.1 0.1 V

3.0 0.0 0.1 0.1

4.5 0.0 0.1 0.1

3.0 I

OL

=

4mA 0.36 0.44

4.5 I

OL

=

8mA 0.36 0.44

I

IN

Input Leakage

Current

0–5.5 V

IN

= 5.5V or GND ±0.1 ±1.0 µA

ICC Quiescent

Supply Current

5.5 VIN = VCC or GND 4.0 40.0 µA

Symbol Parameter VCC (V) Conditions

TA = 25°C

UnitsTyp. Limits

VOLP(3) Quiet Output Maximum

Dynamic VOL

5.0 CL = 50pF 0.3 0.8 V

VOLV(3) Quiet Output Minimum

Dynamic VOL

5.0 CL = 50pF –0.3 –0.8 V

VIHD(3) Minimum HIGH Level

Dynamic Input Voltage

5.0 CL = 50pF 3.5 V

VILD(3) Maximum LOW Level

Dynamic Input Voltage

5.0 CL = 50pF 1.5 V

74VHC157 Quad 2-Input Multiplexer

74VHC157 Rev. 1.2 6

AC Electrical Characteristics

Note:

3. CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating

current consumption without load. Average operating current can be obtained by the equation:

ICC (opr.) = CPD • VCC • fIN + ICC

Symbol Parameter

VCC

(V) Conditions

TA = 25°C

TA = –40°C

to +85°C

UnitsMin. Typ. Max. Min. Max.

tPLH, tPHL Propagation Delay,

In to Zn

3.3 ± 0.3 CL = 15pF 6.2 9.7 1.0 11.5 ns

CL = 50pF 8.7 13.2 1.0 15.0

5.0 ± 0.5 CL = 15pF 4.1 6.4 1.0 7.5 ns

CL = 50pF 5.6 8.4 1.0 9.5

tPLH, tPHL Propagation Delay,

S to Zn

3.3 ± 0.3 CL = 15pF 8.4 13.2 1.0 15.5 ns

CL = 50pF 10.9 16.7 1.0 19.0

5.0 ± 0.5 CL = 15pF 5.3 8.1 1.0 9.5 ns

CL = 50pF 6.8 10.1 1.0 11.5

tPLH, tPHL Propagation Delay,

E to Zn

3.3 ± 0.3 CL = 15pF 8.7 13.6 1.0 16.0 ns

CL = 50pF 11.2 17.1 1.0 19.5

5.0 ± 0.5 CL = 15pF 5.6 8.6 1.0 10.0 ns

CL = 50pF 7.1 10.6 1.0 12.0

CIN Input Capacitance VCC = Open 4 10 10 pF

CPD Power Dissipation

Capacitance

(3) 20 pF

74VHC157 Quad 2-Input Multiplexer

74VHC157 Rev. 1.2 7

Physical Dimensions

Dimensions are in millimeters unless otherwise noted.

Figure 1. 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

Package Number M16A

74VHC157 Quad 2-Input Multiplexer

74VHC157 Rev. 1.2 8

Physical Dimensions (Continued)

Dimensions are in millimeters unless otherwise noted.

Figure 2. 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

Package Number M16D

74VHC157 Quad 2-Input Multiplexer

74VHC157 Rev. 1.2 9

Physical Dimensions (Continued)

Dimensions are in millimeters unless otherwise noted.

Figure 3. 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Package Number MTC16

0.65

4.4±0.1

MTC16rev4

0.11

4.55

5.00

5.00±0.10

12°

7.354.45

1.45

5.90

74VHC157 Quad 2-Input Multiplexer

74VHC157 Rev. 1.2 10

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APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER

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As used herein:

1. Life support devices or systems are devices or systems

which, (a) are intended for surgical implant into the body or

(b) support or sustain life, and (c) whose failure to perform

when properly used in accordance with instructions for use

provided in the labeling, can be reasonably expected to

result in a significant injury of the user.

2. A critical component in any component of a life support,

device, or system whose failure to perform can be

reasonably expected to cause the failure of the life support

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

PRODUCT STATUS DEFINITIONS

Definition of Terms

Datasheet Identification Product Status Definition

Advance Information Formative or In Design This datasheet contains the design specifications for product

development. Specifications may change in any manner without notice.

Preliminary This datasheet contains preliminary data; supplementary data will be

published at a later date. Fairchild Semiconductor reserves the right to

make changes at any time without notice to improve design.

No Identification Needed Full Production

First Production

This datasheet contains final specifications. Fairchild Semiconductor

reserves the right to make changes at any time without notice to improve

design.

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discontinued by Fairchild Semiconductor. The datasheet is printed for

reference information only.

Rev. I26