Datasheet M74HC245B1 Specification

M54/74HC245/640/643
M54/74HC245/640/643

OCTALBUS TRANSCEIVER(3-STATE):HC24 5 NONINVERTING

HC640 INVERTING, HC643 INVERTING/NON INVERTING

.HIGH SPEED

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

.LOWPOWER DISSIPATION

ICC=4µA (MAX.) at TA=25oC

.HIGH NOISEIMMUNITY

V

NIH=VINL

.OUTPUT DRIVE CAPABILITY

15 LSTTL LOADS

=28%VCC(MIN.)

B1R

(PlasticPackage)

F1R

(CeramicPackage)

.SYMMETRICALOUTPUT IMPEDANCE

|IOH|=IOL=6 mA (MIN)

.BALANCEDPROPAGATIONDELAYS

t

PLH=tPHL

.WIDE OPERATINGVOLTAGERANGE

VCC(OPR)= 2 V TO6 V

.PIN AND FUNCTION COMPATIBLE

WITH 54/74LS245/640/643

DESCRIPTION

The M54/74HC245, HC640 and HC643 utilise
silicongate C2MOStechnology toachiveoperating
speedsequivalent to LSTTLdevices.

Alongwith thelow power dissipationand high noise
immunity of standards C2MOS integrated circuit,it
possesses the capability to drive 15 LSTTL loads.
TheseIC’s are intended fortwo-way asynchronous
communication between data buses, and the
direction of data trasmission is determined by DIR
input. The enable input (G) can be used to disable
the deviceso thatthe busesare effectivelyisolated.

All input are equipped with protection circuits
againststaticdischargeandtransientdischargeand
transient excess voltage.

IT IS PROHIBITED TO APPLY A SIGNAL TO A
BUS TERMINAL WHEN IT IS IN OUTPUT MODE
AND WHEN A BUS THERMINAL IS FLOATING
(HIGH IMPEDANCE STATE), IT IS REQUESTED
TO FIX THE INPUT LEVEL BY MEANS OF
EXTERNAL PULL DOWN OR PULL UP
RESISTOR.

M1R

(MicroPackage)

ORDER CODES :

M54HC X XXF1R M74HC XXXM1R
M74HC X XXB1R M74HCXXXC1 R

C1R

(Chip Carrier)

PIN CONNECTION (top view)

HC245 HC640 HC643

October 1993

1/11

M54/M74HC245/640/643

INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION

PIN No SYMBOL NAME AND FUNCTION

1 DIR Directional Control

2, 3, 4, 5,

6, 7, 8, 9

18, 17, 16,
15, 14, 13,

12, 11

19 G Output Enabel Input

10 GND Ground (0V)
20 V

IEC LOGIC SYMBOLS

HC245 HC6 40 HC643

A1 to A8 Data Inputs/Outputs

B1 to B8 Data Inputs/Outputs

CC

(Active LOW)

Positive Supply Voltage

TRUTH TABLE

INPUT FUNCTION OUTPUT

G DIR A BUS B BUS HC245 HC640 HC643

L L OUTPUT INPUT A = B A = B A = B
L H INPUT OUTPUT B = A B = A B = A

HXZZZZZ

X: ”H” or”L”
Z: High impedance

2/11

LOGIC DIAGRAM (HC640)

M54/M74HC245/640/643

NOTE:IN CASE OF HC245 ORHC643, INPUT INVERTERS MARKED*AT ABUS AND B BUS ARE ELIMINATED RESPECTIVELY

ABSOLU TE MAXIMUM RATI NG

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 beyondwhichdamage tothedevicemayoccur.Functionaloperationundertheseconditionisnotimplied.
(*)500 mW:≅ 65oC derateto 300 mW 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

L

o

C

o

C

3/11

M54/M74HC245/640/643

RECO MM ENDED OPERAT I N G CONDI TI O NS

Symbol Parameter Value Unit

V

V

V

T

t

r,tf

DC SPECIFICATIO NS

Symbol Parameter

V

IH

V

V

OH

V

OL

I

I

OZ

I

CC

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

V

= 6 V 0 to 400

CC

Test Conditions Value

V

(V)

CC

=25oC

T

A

54HC and 74HC

-40 to 85oC
74HC

-55 to 125oC

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

High Level Input
Voltage

2.0 1.5 1.5 1.5

4.5 3.15 3.15 3.15

6.0 4.2 4.2 4.2

Low Level Input

IL

Voltage

2.0 0.5 0.5 0.5

4.5 1.35 1.35 1.35

6.0 1.8 1.8 1.8

High Level
Output Voltage

Low Level Output
Voltage

Input Leakage

I

Current
3 State Output

Off State Current
Quiescent Supply

2.0
V

=

I

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

IO=-20 µA

V

IH

or

V

IL

=-6.0 mA 4.18 4.31 4.13 4.10

O

=-7.8 mA 5.68 5.8 5.63 5.60

O

V

=

I

IO=20µA

V

IH

or

V

IL

= 6.0 mA 0.17 0.26 0.33 0.40

O

= 7.8 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 µA

VO=VCCor GND

6.0 VI=VCCor GND 4 40 80 µA

Current

54HC

V
V

o

C

o

C

Unit

V

V

V

V

4/11

M54/M74HC245/640/643

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

Test Conditions Value

T

=25oC

Symbol Parameter

t
t

TLH
THL

Output Transition
Time

V

C

CC

(V)

L

(pF)

2.0

50

4.5 7121918

A

54HC and 74HC

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

25 60 75 90

6.0 6101315

t

PLH

t

PHL

Propagation
Delay Time

2.0

50

4.5 12 18 23 27

33 90 115 135

6.0 10 15 20 23

2.0
150

4.5 16 24 30 36

48 120 150 180

6.0 14 20 26 31

t

t

PZL
PZH

Output Enable
Time

2.0

50 RL=1KΩ

4.5 16 30 38 45

48 150 190 225

6.0 14 26 32 38

2.0
150 R

4.5 21 36 45 54

=1KΩ

L

63 180 225 270

6.0 18 31 38 46

t

t

PLZ
PHZ

Output Disable
Time

2.0

50 RL=1KΩ

4.5 17 30 38 45

37 150 190 225

6.0 15 26 32 38

Input Capacitance DIR, G 5 10 10 10 pF

IN

Output

An, Bn 13

C

C

I/OUT

Capacitance

C

(*) Power Dissipation

PD

Capacitance

(*) CPDisdefined as the value of the IC’s internal equivalent capacitance which is calculated fromthe operatingcurrent consumption withoutload.
(Referto TestCircuit).Average operting currentcan beobtained bythefollowingequation. ICC(opr) = CPD•VCC•fIN+ICC/8(per circuit)

HC245

HC640/643

39
37

-40 to 85oC
74HC

-55 to 125oC
54HC

Unit

ns

ns

ns

ns

ns

ns

pF

pF

5/11

M54/M74HC245/640/643

SWITCHING CHARACTERISTICS TEST WAVEFORM

TEST CIRCUIT ICC(Opr.) CPDCALCULATION

CPDis to be calculated with the following
formula by using the measured value of I
(Opr.)in the test circuitopposite.

CPD=

I

(

Opr

CC

fINxV

CC

.)

CC

6/11

M54/M74HC245/640/643

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

P001J

7/11

M54/M74HC245/640/643

Ceramic DIP20 MECHANICAL DATA

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

8/11

P057H

SO20 MECHANICAL DATA

M54/M74HC245/640/643

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

P013L

9/11

M54/M74HC245/640/643

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/M74HC245/640/643

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consequences of useof such information norfor any infringementof patents or other rights of third parties which may results from its use. No
license is granted by implication orotherwise under any patentor patentrights ofSGS-THOMSON Microelectronics. Specificationsmentioned
in this publication are subject to changewithout notice. This publication supersedes and replaces all information previously supplied.
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