SGS Thomson Microelectronics 74ACT157 Datasheet

QUAD 2 CHANNEL MULTIPLEXER

■ HIGH SPEED:t

■ LOWPOWER DISSIPATION:

=8µA (MAX.) at TA=25oC

I

CC

■ COMPATIBLEWITH TTL OUTPUT S

V

=2V(MIN), VIL= 0.8V (MAX)

IH

■ 50Ω TRANSMISSION LINE DRIVING

CAPABILITY

■ SYMMETRICAL OUTPUT IMPEDANCE:

|I

|=IOL=24 mA (MIN)

OH

■ BALANCEDPROPAGATIONDELAYS:

t

≅ t

PLH

PHL

■ OPERATINGVOLTAGERANGE:

V

(OPR)= 4.5V to 5.5V

CC

■ PIN AND FUNCTION COMPATIBLE WITH

74SERIES157

■ IMPROVED LATCH-UPIMMUNITY

DESCRIPTION

The ACT157 is an high-speed CMOS QUAD 2-CHANNEL MULTIPLEXER fabricated with sub-micron silicon gate and double-layer metal wiring C

2

MOS technology. It is ideal for low power applications maintaining high speed operation similar to equivalent Bipolar Schottky TTL.

It consistsof four 2-input digital multiplexers with

= 5.5 ns (TYP.)at VCC=5V

PD

74ACT157

PRELIMINARY DATA

B

(Plastic Package)

(Micro Package)

ORDERCODES:

74ACT157B 74ACT157M

common select and strobe inputs. It is a non-inverting multiplexer. When the STROBE input is held High selection of data is inhibit and all the outputs become low. The SELECT decoding determines whether the A or B inputs get routed to their correspondingY outputs.

The device is designed to interface directly High Speed CMOS systems with TTL, NMOS and CMOSoutput voltagelevels.

All inputs and outputs are equipped with protectioncircuits against static discharge, giving them 2KV ESD immunity and transient excess voltage.

M

PINCONNECTION ANDIEC LOGICSYMBOLS

May 1997

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74ACT157

INPUTAND OUTPUT EQUIVALENTCIRCUIT

PIN DESCRIPTION

PI N No SYM B O L NAME A ND FUNC T I ON

1 SELECT Common Data Select Input

2,5,11,14 1Ato4A Data Inputs From

Source A

3,6,10,13 1Bto4B Data Inputs From

Source B

4,7,9,12 1Yto4Y Multiplexer Outputs

15 STROBE Strobe Input

8 GND Ground (0V)

16 V

CC

Positive Supply Voltage

TRUTH TABLE

INPUT OUTPUT

ST RO B E SEL ECT A B Y

HXXXL

LLLXL

LLHXH

LHXLL

LHXHH

X:”H”or ”L”

ABSOLUTE MAXIMUM RATING

Symb o l Parame t er Val u e Uni t

V

I

OK

I

orI

I

CC

T

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.

Supply Voltage -0.5to+7 V

CC

DC Input Voltage -0.5toVCC+0.5 V

I

DC Output Voltage -0.5toVCC+0.5 V

O

DC Input Diode Current ± 20 mA

IK

DC Output Diode Current ± 20 mA DC Output Current ± 50 mA

O

DC VCCor Ground Current ± 200 mA

GND

Storage Temperature -65 to+150

stg

Lead Temperature (10 sec) 300

L

o

C

o

C

RECOMMENDEDOPERATINGCONDITIONS

Symbol Parameter Valu e Unit

V

T

dt/dv Input Rise and Fall Time V

1) VINfrom0.8Vto2.0V

Supply Voltage 4.5to5.5 V

CC

Input Voltage 0toV

I

Output Voltage 0toV

O

Operating Temperature: -40to+85

op

= 4.5 to 5.5V (note 1) 8 ns/V

CC

CC CC

V V

o

C

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DC SPECIFICATIONS

74ACT157

Symbol Parameter Test Condition s Value Unit

=25oC-40to85

V

CC

(V)

High Level Input Voltage 4.5 VO=0.1 Vor

V

IH

5.5 2.0 1.5 2.0

Low Level Input Voltage 4.5 VO=0.1 Vor

V

IL

5.5 1.5 0.8 0.8

High Level Output

V

OH

Voltage

4.5

5.5 I

4.5 I

5.5 I

Low Level Output

V

OL

Voltage

4.5

5.5 I

4.5 I

5.5 I

Input Leakage Current

I

Max ICC/Input 5.5 VI=VCC-2.1V 0.6 1.5 mA

I

CCT

Quiescent Supply

I

CC

5.5

5.5 VI=VCCorGND 8 80 µA

V

-0.1 V

CC

-0.1 V

V

CC

IO=-50µA 4.4 4.49 4.4

(*)

=

V

I

or

V

IH

V

IL

(*)

V

I

V

or

IH

V

IL

=-50µA 5.4 5.49 5.4

O

=-24 mA 3.86 3.76

O

=-24 mA 4.86 4.76

O

IO=50µA0.0010.1 0.1

=

=50 mA 0.001 0.1 0.1

O

=24mA 0.36 0.44

O

=24mA 0.36 0.44

O

VI=VCCorGND ±0.1 ±1 µA

T

A

Min. Typ. Max. Min. Max.

2.0 1.5 2.0

1.5 0.8 0.8

o

C

Current Dynamic Output Current

I

OLD

(note 1, 2)

I

OHD

1) Maximum test duration 2ms, one output loaded at time

2) Incident wave switching is guaranteed on transmission lines with impedances as low as 50 Ω. (*)All outputs loaded.

5.5 V

=1.65 Vmax 75 mA

OLD

V

=3.85Vmin -75 mA

OHD

V

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