Datasheet M74HCT688 Datasheet (SGS Thomson Microelectronics)

.HIGH SPEED

tPD= 17 ns(TYP.) AT VCC=5V

.LOWPOWER DISSIPATION

ICC=4µA(MAX.) AT TA=25°C

.COMPATIBLE WITH TTL OUTPUTS

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

.OUTPUT DRIVE CAPABILITY

10 LSTTLLOADS

.SYMMETRICALOUTPUT IMPEDANCE

|IOH|=IOL= 4 mA (MIN.)

.BALANCEDPROPAGATION DELAYS

t

PLH=tPHL

.PIN ANDFUNCTION COMPATIBLE

WITH 54/74LS688

M54HCT688
M74HCT688

8 BITEQUALITY COMPARATOR

B1R

(PlasticPackage)

M1R

(MicroPackage)

ORDER CODES :

M54HC T688F1R M74H CT688M1R
M74HC T688B1R M74HCT688C1R

F1R

(CeramicPackage)

C1R

(Chip Carrier)

DESCRIPTION

The M54/74HCT688 utilizes silicon gate C2MOS
technology to achieve operating speeds equivalent
to LSTTL devices. Along with the low power
dissipation and high noise immunity of standard
C2MOS integrated circuit, it possesses the driving
capability of 10 LSTTL load. The M54/74HCT688
compares bitforbittwo8-bit wordsapplied oninputs
P0 - P7 and inputs Q0 - Q7 and indicates whether
or not they are equal. A single active lowenable is
provided to facilitate cascading severalpackagesto
enablecomparison of wordsgreater than 8 bits.

This integrated circuit has input and output
characteristics 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
plug in replacements for LSTTL devices giving a
reduction ofpower consumption.

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

PIN CONNECTIONS(top view)

NC =
No Internal
Connection

February 1993

1/10

M54/M74HCT688

INPUT AND OUTPUT EQUIVALENT CIRCUIT

TRUTH TABLE

INPUT OUTPUT

P, Q G P = Q

P=Q L L
P≠QL H

XHH

X:DON’T CARE

LOGIC DIAGRAM

2/10

M54/M74HCT688

PIN DESCRIPTION

IEC LOGIC SYMBOL

PIN No SYMBOL NAME AND FUNCTION

1 G Enable Input (Active

LOW)

2, 4, 6, 8,

P0 to P7 Word Inputs

11, 13, 15,

17

3, 5, 7, 9,

Q0 to Q7 Word Outputs

12, 14, 16,

18
19 P = Q Equal to Output
10 GND Ground (0V)
20 V

CC

Positive Supply Voltage

ABSOLU TE MAXIMU M RAT ING S

Symbol Parameter Value Unit

V

CC

V

V

O

I

IK

I

OK

I

O

or I

I

CC

P

D

T

stg

T

AbsoluteMaximumRatingsarethosevaluesbeyondwhichdamage tothedevicemayoccur.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 OPERATIN G CONDI TI O NS

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/M74HCT688

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

Input Leakage

I

I

Current
Quiescent Supply

CC

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

=-4.0 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

= 4.0 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

5.5 Per Input pin

2.0 2.9 3.0 mA

VI= 0.5V or

V

= 2.4V

I

Other Inputs at

VCCor GND

V

V

4/10

M54/M74HCT688

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

Test Conditions Value

T

=25oC

Symbol Parameter

t
t

t
t

TLH
THL

PLH
PHL

Output Transition
Time

Propagation
Delay Time

V

CC

(V)

4.5 8151922

4.5 21 32 40 48

A

54HC and 74HC

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

(Pn, Qn - P = Q)

t
t

PLH
PHL

Propagation
Delay Time

4.5 15 23 29 35

(G - P = Q)

C

C

PD

Input Capacitance 5 10 10 10 pF

IN

(*) Power Dissipation

32

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 bythefollowingequation. ICC(opr) = CPD•VCC•fIN+I

-40 to 85oC
74HC

-55 to 125oC
54HC

CC

Unit

ns

ns

ns

pF

SWITCHING CHARACTERISTICS TEST
WAVEFORM

TEST CIRCUIT ICC (Opr.)

INPUT WAVEFORM IS THE SAME AS THAT IN CASE OF
SWITCHINGCHARACTERISTICSTEST.

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M54/M74HCT688

Plastic DIP20 (0.25) MECHANICAL DATA

DIM.

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

a1 0.254 0.010

B 1.39 1.65 0.055 0.065

b 0.45 0.018

b1 0.25 0.010

D 25.4 1.000
E 8.5 0.335

e 2.54 0.100

e3 22.86 0.900

F 7.1 0.280

I 3.93 0.155

L 3.3 0.130

Z 1.34 0.053

mm inch

6/10

P001J

Ceramic DIP20 MECHANICAL DATA

M54/M74HCT688

DIM.

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

A 25 0.984
B 7.8 0.307
D 3.3 0.130
E 0.5 1.78 0.020 0.070

e3 22.86 0.900

F 2.29 2.79 0.090 0.110

G 0.4 0.55 0.016 0.022

I 1.27 1.52 0.050 0.060

L 0.22 0.31 0.009 0.012

M 0.51 1.27 0.020 0.050

N1 4° (min.), 15° (max.)

P 7.9 8.13 0.311 0.320

Q 5.71 0.225

mm inch

P057H

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M54/M74HCT688

SO20 MECHANICAL DATA

DIM.

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

A 2.65 0.104
a1 0.10 0.20 0.004 0.007
a2 2.45 0.096

b 0.35 0.49 0.013 0.019

b1 0.23 0.32 0.009 0.012

C 0.50 0.020

c1 45° (typ.)

D 12.60 13.00 0.496 0.512

E 10.00 10.65 0.393 0.419

e 1.27 0.050

e3 11.43 0.450

F 7.40 7.60 0.291 0.299

L 0.50 1.27 0.19 0.050

M 0.75 0.029

S8°(max.)

mm inch

8/10

P013L

PLCC20 MECHANICAL DATA

M54/M74HCT688

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/M74HCT688

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 partieswhich 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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