Datasheet M74HCT126, M74HCT125 Datasheet (SGS Thomson Microelectronics)

.HIGH SPEED

tPD= 12 ns(TYP.) AT VCC=5V

.LOWPOWER DISSIPATION

ICC=4µA(MAX.) AT 25 °C

.OUTPUT DRIVE CAPABILITY

15 LSTTLLOADS

.BALANCEDPROPAGATION DELAYS

t

PLH=tPHL

.SYMMETRICALOUTPUT IMPEDANCE

IOL=IOH = 6 mA (MIN.)

.COMPATIBLE WITHTTL OUTPUTS

VIH= 2V(MIN.) VIL= 0.8V(MAX)

.PIN AND FUNCTION COMPATIBLE

WITH 54/74LS125/126

DESCRIPTION

The M54/74HCT125/126 are high speed CMOS
QUAD BUS BUFFER (3-STATE) FABRICATED IN
SILICONGATEC2MOStechnology. They havethe
same high speed performance ofLSTTLcombined
withtrue CMOS lowpowerconsumption. Thesede­vicesrequire the same 3-STATE control input G to
be takenhigh to makethe output gointothehigh im­pedancestate.This integrated circuit has input and
outputcharacteristics that are fully compatible with
54/74 LSTTL logic families. M54/74HCT devices
are designed to directly interface HSC2MOS sys­tems with TTL and NMOS components. They are
also plugin replacements forLSTTL devices giving
a reduction of power consumption. All inputs are
equipped with protection circuits against static dis­charge and transientexcessvoltage.

M54/74HCT125
M54/74HCT126

QUAD BUS BUFFERS (3-STATE)

B1R

(PlasticPackage)

M1R

(MicroPackage)

ORDER CODES :

M54HC TXXXF1 R M74H CTXXXM1 R
M74HC TXXXB1R M74HCT XXXC1R

PIN CONNECTIONS (topview)

HCT125

F1R

(CeramicPackage)

C1R

(Chip Carrier)

INPUT AND OUTPUT EQUIVALENT CIRCUIT

October 1993

HCT126

NC =
No Internal
Connection

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M54/M74HCT125/126

CHIP CARRIER

HCT125 HCT126

TRUTH TABLE (HCT125 )

AGY

XHZ

LLL

HLH

PIN DESCRIPTION (HCT125)

PIN No SYMBOL NAME AND FUNCTION

1, 4, 10, 13 G1 to G4 Output Enable Input

2, 5, 9, 12 A1 to A4 Data Inputs
3, 6, 8, 11 Y1 to Y4 Data Outputs

7 GND Ground (0V)

14 V

CC

Positive Supply Voltage

IEC LOGIC SYMBOLS

HCT125 HCT126

TRUTH TABLE (HCT12 6)

AGY

XLZ

LHL

HHH

PIN DESCRIPTION (HC T126)

PIN No SYMBOL NAME AND FUNCTION

1, 4, 10, 13 G1 to G4 Output Enable Input

2, 5, 9, 12 A1 to A4 Data Inputs
3, 6, 8, 11 Y1 to Y4 Data Outputs

7 GND Ground (0V)

14 V

CC

Positive Supply Voltage

2/10

CIR CUI T DI A GR AM

HCT125 HCT126

ABSOLU TE M AXIMU M R AT INGS

M54/M74HCT125/126

Symbol Parameter Value Unit

V

CC

V

V

O

I

IK

I

OK

I

O

I

or I

CC

P

D

T

stg

T

L

AbsoluteMaximum Ratingsarethosevalues beyond whichdamage tothedevicemayoccur.Functionaloperation under theseconditionsis notimplied.
(*)500 mW: ≅ 65oC derate to300mW by 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 ± 35 mA
DC VCCor Ground Current ± 70 mA

GND

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

o

C

o

C

RECO MM ENDED OPERAT I N G C ONDITI ONS

Symbol Parameter Value Unit

V

T

t

V

V

r,tf

Supply Voltage 4.5 to 5.5 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= 4.5 to 5.5V) 0 to 500 ns

V
V

o

C

o

C

3/10

M54/M74HCT125/126

DC SPECIFICATIONS

Symbol Parameter

V

V

V

V

I

I

∆I

High Level Input

IH

Voltage

Low Level Input

IL

Voltage

High Level

OH

Output Voltage

Low Level Output

OL

Voltage

Input Leakage

I

I

Current
Quiescent Supply

CC

Current
3 State Output

OZ

Off State Current
Additional worst

CC

case supply
current

Test Conditions Value

V

(V)

4.5

CC

=25oC

A

54HC and 74HC

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

2.0 2.0 2.0 V

-40 to 85oC
74HC

-55 to 125oC
54HC

Unit

T

to

5.5

4.5

0.8 0.8 0.8 V

to

5.5
VI=

IO=-20 µA 4.4 4.5 4.4 4.4

V

IH

4.5

or

I

=-6.0 mA 4.18 4.31 4.13 4.10

O

V

IL

VI=

IO=20µA 0.0 0.1 0.1 0.1

V

IH

4.5

or

I

= 6.0 mA 0.17 0.26 0.33 0.4

O

V

IL

VI=VCCor GND ±0.1 ±1 ±1 µA

5.5

5.5 VI=VCCor GND 4 40 80 µA

VI=VIHor V

6.0

VO=VCCor GND

5.5 Per Input pin

IL

±0.5 ±5 ±10 µA

2.0 2.9 3.0 mA

VI= 0.5V or

VI= 2.4V

Other Inputs at

V

or GND

CC

IO=0

V

V

AC ELECTRICAL CHARACTERISTICS (Input tr=tf=6ns)

Test Conditions Value

=25oC

T

Symbol Parameter

t

TLH

t

THL

t

PLH

t

PHL

t

PZL

t

PZH

t

PLZ

t

PHZ

C

C

PD

Output Transition
Time

Propagation
Delay Time

3 State Output
Enable Time

3 State Output
Disable Time

Input Capacitance 5 10 10 10 pF

IN

(*) Power Dissipation

C

V

CC

(V)

L

(pF)

4.5 50 7 12 15 18 ns

4.5 50 13 21 26 32 ns

4.5 150 17 27 34 41 ns

4.5 50 RL=1KΩ 15 24 30 36 ns

4.5 150 R

=1KΩ 19 30 38 45 ns

L

4.5 50 RL=1KΩ 17 24 30 36 ns

A

54HC and 74HC

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

56

Capacitance

(*) CPDisdefined asthe valueofthe IC’s internal equivalent capacitance which is calculated from the operatingcurrent consumption withoutload.
(RefertoTest Circuit).Average operting current can be obtained by the followingequation. ICC(opr) = CPD•VCC•fIN+I

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-40 to 85oC
74HC

-55 to 125oC
54HC

CC

Unit

pF

TEST CIRCUIT ICC(Opr.)

HCT125

HCT126

M54/M74HCT125/126

THE OTHER INPUTS ARE CONNECTED TO V

SWITCHING CHARACTERISTICS TEST WAVEFORM

HCT125

HCT126

LINEOR GND LINE

CC

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M54/M74HCT125/126

Plastic DIP14 MECHANICAL DATA

DIM.

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

a1 0.51 0.020

B 1.39 1.65 0.055 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 15.24 0.600

F 7.1 0.280

I 5.1 0.201

L 3.3 0.130

Z 1.27 2.54 0.050 0.100

mm inch

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P001A

Ceramic DIP14/1 MECHANICAL DATA

M54/M74HCT125/126

DIM.

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

A 20 0.787
B 7.0 0.276
D 3.3 0.130
E 0.38 0.015

e3 15.24 0.600

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 1.52 2.54 0.060 0.100
N 10.3 0.406

P 7.8 8.05 0.307 0.317

Q 5.08 0.200

mm inch

P053C

7/10

M54/M74HCT125/126

SO14 MECHANICAL DATA

DIM.

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

A 1.75 0.068
a1 0.1 0.2 0.003 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 8.55 8.75 0.336 0.344

E 5.8 6.2 0.228 0.244

e 1.27 0.050

e3 7.62 0.300

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 0.68 0.026

S8°(max.)

mm inch

8/10

P013G

PLCC20 MECHANICAL DATA

M54/M74HCT125/126

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

P027A

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M54/M74HCT125/126

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 patent rights ofSGS-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 orsystems without express
written approval of SGS-THOMSON Microelectonics.

 1994 SGS-THOMSON Microelectronics - All Rights Reserved

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