SGS Thomson Microelectronics M74HC258, M74HC257 Datasheet

M54/M74HC257
M54/M74HC258

HC257 QUAD 2 CHANNEL MULTIPLEXER (3-STATE)

HC258 QUAD 2 CHANNEL MULTIPLEXER (3-STATE, INVERTING)

.HIGH SPEED

tPD= 10 ns(TYP.) at VCC=5V

.LOWPOWER DISSIPATION

ICC=4µA(MAX.) at TA=25°C

.HIGH NOISEIMMUNITY

V

NIH=VNIL

.OUTPUT DRIVE CAPABILITY

15 LSTTL LOADS

=28%VCC(MIN.)

B1R

(PlasticPackage)

F1R

(CeramicPackage)

.SYMMETRICAL OUTPUT IMPEDANCE

IOH =IOL= 6 mA (MIN.)

.BALANCEDPROPAGATION DELAYS

t

PLH=tPHL

.WIDE OPERATING VOLTAGE RANGE

VCC(OPR)= 2 V to 6 V

.PIN AND FUNCTION COMPATIBLE

WITH 54/74LS257/258

M1R

(MicroPackage)

ORDER CODES :

M54HC X XXF 1 R M74H CXXXM1 R
M74HC X XXB1R M74H CXXXC1R

C1R

(Chip Carrier)

DESCRIPTION

The M54/74HC257 andtheM54/74HC258are high
speed CMOS MULTIPLEXERs fabricated withsili­con gate C2MOS technology.

They have the same high speed performance of
LSTTL combined with true CMOS low power con­sumption.

These IC’s are composed of an independent 2­channelmultiplexer with commonSELECT andEN­ABLE INPUT.

The M54/74HC258 isan invertingmultiplexer while
the M54/74HC257 is a non-inverting multiplexer.
WhentheENABLE INPUTis held”High”,outputsof
bothIC’sbecomehigh-impedance state.IfSELECT
INPUTis held”Low”, ”A” dataisselected,when SE­LECT INPUT is high ”H”, ”B” data is chosen.

All inputs are equipped with protection circuits
against static discharge and transient excess volt­age.

PIN CONNECTIONS(topview)

HC257

HC258

October 1992

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M54/M74HC257/258

INPUT AND OUTPUT EQUIVALENT CIRCUIT

CHIP CARRIER

HC257 HC258

NC = No Internal Connection

PIN DESCRIPTION (HC257)

PIN No SYMBOL NAME AND FUNCTION

1 SELECT Common Data Select

Input
2, 5, 14, 11 1A to 4A Data Input FromSource A
3, 6, 13, 10 1B to 4B Data Inputs fromSource B

4, 7, 12, 9 1Y to 4Y 3 State Multiplexer

Outputs

15 OE 3 State Output Enable

Inputs (Active LOW)

8 GND Ground (0V)

16 V

CC

Positive Supply Voltage

PIN DESCRIPTION (H C 2 58 )

PIN No SYMBOL NAME AND FUNCTION

1 SELECT Common Data Select

Input
2, 5, 14, 11 1A to 4A Data Input From Source A
3, 6, 13, 10 1B to 4B Data Inputs from Source B

4, 7, 12, 9 1Y to 4Y 3 State Multiplexer

Outputs

15 OE 3 State Output Enable

Inputs (Active LOW)

8 GND Ground (0V)

16 V

CC

Positive Supply Voltage

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IEC LOGIC SYMBOL

LOGIC DIAGRAM

M54/M74HC257/258

HC258HC257

HC257 HC258

TRUTH TABLE

OE SELECT A B Y (257) Y (258)

HXXXZZ

LLLXLH
LLHXHL
LHXLLH
LHXHHL

X =DON’TCARE Z = HIGH IMPEDANCE

INPUTS OUTPUTS

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M54/M74HC257/258

ABSOLU TE MAXI MUM RAT I NG S

Symbol Parameter Value Unit

V

CC

V

V

O

I

IK

I

OK

I

O

I

or I

CC

P

D

T

stg

T

AbsoluteMaximumRatingsarethosevalues beyondwhichdamagetothedevicemayoccur.Functionaloperationunder theseconditionisnotimplied.
(*)500 mW: ≅ 65oC derate to300 mW by 10mW/oC: 65oCto85oC

RECO MM ENDED OPERATIN G CONDI TIONS

Symbol Parameter Value Unit

V

CC

V

I

V

O

T

op

t

r,tf

Supply Voltage -0.5 to +7 V
DC Input Voltage -0.5 to VCC+ 0.5 V

I

DC Output Voltage -0.5 to VCC+ 0.5 V
DC Input Diode Current ± 20 mA
DC Output Diode Current ± 20 mA
DC Output Source Sink CurrentPer Output Pin ± 35 mA
DC VCCor Ground Current ± 70 mA

GND

Power Dissipation 500 (*) mW
Storage Temperature -65 to +150
Lead Temperature (10 sec) 300

L

Supply Voltage 2 to 6 V
Input Voltage 0 to V
Output Voltage 0 to V
Operating Temperature: M54HC Series

M74HC Series

CC
CC

-55 to +125

-40 to +85

Input Rise and Fall Time VCC= 2 V 0 to 1000 ns

V

= 4.5 V 0 to 500

CC

V

= 6 V 0 to 400

CC

o

C

o

C

V
V

o

C

o

C

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