Datasheet M74HC251 Datasheet (SGS Thomson Microelectronics)

.HIGH SPEED

tPD= 14 ns(TYP.) AT VCC=5V

.LOWPOWER DISSIPATION

ICC=4µA(MAX.) AT TA=25°C6V

.HIGH NOISE IMMUNITY

V

NIH=VNIL

=28%VCC(MIN.)

.OUTPUT DRIVE CAPABILITY

10 LSTTLLOADS

.SYMMETRICALOUTPUT IMPEDANCE

IOH =IOL= 4 mA(MIN.)

.BALANCEDPROPAGATION DELAYS

t

PLH=tPHL

.WIDE OPERATINGVOLTAGE RANGE

VCC(OPR)= 2 V TO6 V

.PIN AND FUNCTION COMPATIBLE WITH

54/74LS251

DESCRIPTION

TheM54/74HC251is ahighspeedCMOS8-CHAN­NELMULTIPLEXER(3-STATE)fabricatedinsilicon
gate C2MOS technology. It has the same high
speed performance of LSTTL combined with true
CMOS low power consumption. This multiplexer
featuresboth true (Y) and complement (W)outputs
as well as STROBE input.The STROBEmust be a
low logic level to enable this device. When the
STROBEinput is high, both outputs are in the high
impedance state. When enabled, address informa­tionon the dataselectinputs determineswhichdata
input is routed to Y and W. All inputs areequipped
with protection circuits against staticdischarge and
transient excess voltage.

M54HC251
M74HC251

8 BITSIPO SHIFT REGISTER

B1R

(PlasticPackage)

M1R

(MicroPackage)

ORDER CODES :

M54HC 251F1R M74H C251M1R
M74HC 251B1R M74HC2 51C1R

PIN CONNECTIONS (top view)

F1R

(CeramicPackage)

C1R

(Chip Carrier)

INPUT AND OUTPUT EQUIVALENT CIRCUIT

February 1993

NC =
No Internal
Connection

1/11

M54/M74HC251

TRUTH TABLE

CBAS

XXXHZZ

LLLLD0D0
L L H L D1 D1
LHLLD2D2

LHHLD3D3
H L L L D4 D4
H L H L D5 D5
H H L L D6 D6
H H H L D7 D7

X:Don’t Care Z: HIGH Impedance

LOGI C DIAG RAM

INPUTS OUTPUS

STROBE

YW

2/11

M54/M74HC251

PIN DESCRIPTION

IEC LOGIC SYMBOL

PIN No SYMBOL NAME AND FUNCTION

4, 3, 2, 1,

D0 to D7 Multiplexer Inputs

15, 14, 13,

12

5 Y Multiplexer Output
6 W Complementary

Multiplexer Output

7 STROBE 3 State Output Enable

Input

11, 10, 9 A, B, C Select Inputs

8 GND Ground (0V)

16 V

CC

Positive Supply Voltage

ABSOLU TE MAXIMU M RATINGS

Symbol Parameter Value Unit

V

CC

V

V

O

I

IK

I

OK

I

O

or I

I

CC

P

D

T

stg

T

AbsoluteMaximumRatingsarethose values beyondwhichdamagetothedevice mayoccur. Functionaloperationunder theseconditionisnotimplied.
(*)500 mW:≅ 65oC derateto 300 mWby 10mW/oC: 65oCto85oC

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 Current Per Output Pin ± 25 mA
DC VCCor Ground Current ± 50 mA

GND

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

L

o

C

o

C

RECO MM ENDED O PERAT IN G C O NDITI O NS

Symbol Parameter Value Unit

V

V

T

t

V

r,tf

Supply Voltage 2 to 6 V

CC

Input Voltage 0 to V

I

Output Voltage 0 to V

O

Operating Temperature: M54HC Series

op

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

= 6 V 0 to 400

V

CC

V
V

o

C

o

C

3/11

M54/M74HC251

DC SPECIFICATIO NS

Symbol Parameter

V

V

V

V

I

I

High Level Input

IH

Voltage

Low Level Input

IL

Voltage

High Level

OH

Output Voltage

Low Level Output

OL

Voltage

I

Input Leakage

I

Current
3 State Output

OZ

Off State Current
Quiescent Supply

CC

Current

Test Conditions Value

V

(V)

CC

=25oC

A

54HC and 74HC

Min. Typ. Max. Min. Max. Min. Max.

-40 to 85oC
74HC

-55 to 125oC
54HC

Unit

T

2.0 1.5 1.5 1.5

4.5 3.15 3.15 3.15

6.0 4.2 4.2 4.2

2.0 0.5 0.5 0.5

4.5 1.35 1.35 1.35

6.0 1.8 1.8 1.8

2.0

4.5 4.4 4.5 4.4 4.4

6.0 5.9 6.0 5.9 5.9

4.5 I

6.0 I

2.0

4.5 0.0 0.1 0.1 0.1

6.0 0.0 0.1 0.1 0.1

4.5 I

6.0 I

6.0

=

V

I

IO=-20 µA

V

IH

or

V

IL

=-4.0 mA 4.18 4.31 4.13 4.10

O

=-5.2 mA 5.68 5.8 5.63 5.60

O

V

=

I

IO=20µA

V

IH

or

V

IL

= 4.0 mA 0.17 0.26 0.33 0.40

O

= 5.2 mA 0.18 0.26 0.33 0.40

O

VI=VCCor GND ±0.1 ±1 ±1 µA

6.0 VI=VIHor V

1.9 2.0 1.9 1.9

0.0 0.1 0.1 0.1

IL

±0.5 ±5.0 ±10 µA

VO=VCCor GND

6.0 VI=VCCor GND 4 40 80 µA

V

V

V

V

4/11

M54/M74HC251

AC ELECTRICAL CHARACTERISTICS (CL=50pF,Inputtr=tf=6ns)

Test Conditions Value

T

=25oC

Symbol Parameter

t
t

TLH
THL

Output Transition
Time

V

CC

(V)

2.0 30 75 95 110

4.5 8151922

A

54HC and 74HC

Min. Typ. Max. Min. Max. Min. Max.

6.0 7131619

t

PLH

t

PHL

t

PLH

t

PHL

t

PZL

t

PZH

Propagation
Delay Time
(D - Y, W)

Propagation
Delay Time
(A, B, C - Y, W)

Output Enable
Time

2.0 64 130 165 195

4.5 16 26 33 39

6.0 14 22 28 33

2.0 80 160 200 240

4.5 20 32 40 48

6.0 17 27 34 41

2.0

4.5 11 18 23 27

RL=1KΩ

36 90 115 135

6.0 9152023

t

PLZ

t

PHZ

Output Disable
Time

2.0
R

=1KΩ

4.5 13 17 21 26

L

26 85 105 130

6.0 11 14 18 22

C

C

PD

Input Capacitance 5 10 10 10 pF

IN

(*) Power Dissipation

62

Capacitance

(*) CPDisdefined as the valueof the IC’s internal equivalent capacitance which is calculatedfromthe operatingcurrent consumption withoutload.
(Referto Test Circuit).Average opertingcurrent can be obtained bythe followingequation. ICC(opr) = CPD•VCC•fIN+I

-40 to 85oC
74HC

-55 to 125oC
54HC

CC

Unit

ns

ns

ns

ns

ns

pF

TEST WAVEFORM ICC(Opr.)

* INPUT WAVEFORMTIMEIS THESAME AS THAT IN CASEOFSWITCHINGCHARACTERISTICSTEST.

5/11

M54/M74HC251

SWITCHING CHARACTERISTICS TEST WAVEFORM

6/11

Plastic DIP16 (0.25) MECHANICAL DATA

M54/M74HC251

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

a1 0.51 0.020

B 0.77 1.65 0.030 0.065

b 0.5 0.020

b1 0.25 0.010

D 20 0.787
E 8.5 0.335

e 2.54 0.100

e3 17.78 0.700

F 7.1 0.280

I 5.1 0.201

L 3.3 0.130

Z 1.27 0.050

mm inch

P001C

7/11

M54/M74HC251

Ceramic DIP16/1 MECHANICAL DATA

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A 20 0.787
B 7 0.276
D 3.3 0.130
E 0.38 0.015

e3 17.78 0.700

F 2.29 2.79 0.090 0.110
G 0.4 0.55 0.016 0.022
H 1.17 1.52 0.046 0.060

L 0.22 0.31 0.009 0.012
M 0.51 1.27 0.020 0.050
N 10.3 0.406

P 7.8 8.05 0.307 0.317

Q 5.08 0.200

mm inch

8/11

P053D

SO16 (Narrow) MECHANICAL DATA

M54/M74HC251

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A 1.75 0.068
a1 0.1 0.2 0.004 0.007
a2 1.65 0.064

b 0.35 0.46 0.013 0.018

b1 0.19 0.25 0.007 0.010

C 0.5 0.019

c1 45° (typ.)

D 9.8 10 0.385 0.393

E 5.8 6.2 0.228 0.244

e 1.27 0.050

e3 8.89 0.350

F 3.8 4.0 0.149 0.157

G 4.6 5.3 0.181 0.208

L 0.5 1.27 0.019 0.050

M 0.62 0.024

S8°(max.)

mm inch

P013H

9/11

M54/M74HC251

PLCC20 MECHANICAL DATA

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A 9.78 10.03 0.385 0.395

B 8.89 9.04 0.350 0.356

D 4.2 4.57 0.165 0.180
d1 2.54 0.100
d2 0.56 0.022

E 7.37 8.38 0.290 0.330

e 1.27 0.050

e3 5.08 0.200

F 0.38 0.015
G 0.101 0.004
M 1.27 0.050

M1 1.14 0.045

mm inch

10/11

P027A

M54/M74HC251

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No
license is granted byimplication or otherwise under any patent or patentrights of SGS-THOMSON Microelectronics. Specificationsmentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronicsproducts are not authorized foruse ascritical componentsin life support devices or systems without express
written approval of SGS-THOMSON Microelectonics.

 1994 SGS-THOMSON Microelectronics - All Rights Reserved

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