SGS Thomson Microelectronics M74HC244, M74HC241, M74HC240 Datasheet

OCTAL BUS B U FFER WITH3 STATE OUTP UTS

HC240: INVERTED - HC241/244 NON INVERTED

.HIGH SPEED

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

.LOWPOWERDISSIPATION

ICC=4µA (MAX.) at TA=25oC

.HIGH NOISEIMMUNITY

V

NIH=VINL

=28%VCC(MIN.)

.OUTPUT DRIVE CAPABILITY

15 LSTTL LOADS

.SYMMETRICALOUTPUT IMPEDANCE

|IOH|=IOL=6 mA(MIN)

.BALANCEDPROPAGATION DELAYS

t

PLH=tPHL

.WIDE OPERATINGVOLTAGE RANGE

VCC(OPR)= 2V to6V

.PIN ANDFUNCTION COMPATIBLE

WITH 54/74LS240/241/244

DESCRIPTION

The M54/74HC240, HC241 and HC244 are high
speed CMOSOCTAL BUS BUFFERs fabricated in
silicongate C2MOS technology.

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

The designerhas a choiseof selectcombination of
inverting and non-inverting outputs, symmetricalG
(active low output control) input, and

M54HC240/241/244
M74HC240/241/244

B1R

(PlasticPackage)

M1R

(MicroPackage)

ORDER CODES :

M54HC X XXF 1 R M74HC XXXM1R
M74HC X XXB1R M 74HCXX X C1R

complementary G and G inputs. Each controlinput
governsfour BUS BUFFERs.

Thesedevices aredesigned tobe used with3state
memory address drivers, etc. All inputs are
equipped with protection circuits against static
discharge and transient excess voltage.

F1R

(CeramicPackage)

C1R

(Chip Carrier)

PIN CONNECTION (top view)

October 1993

HC244HC241HC240

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M54/M74HC240/241/244

CHIP CARRIER

HC244HC241HC240

INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION (HC2 40)

PIN No SYMBOL NAME AND FUNCTION

1 1G Output Enable Input
2, 4, 6, 8 1A1 to 1A4 Data Inputs
9, 7, 5, 3 2Y1 to 2Y4 Data Outputs

11, 13, 15,172A1 to 2A4 Data Inputs

PIN DESCRIPTION (HC241)

PIN No SYMBOL NAME AND FUNCTION

1 1G Output Enable Input
2, 4, 6, 8 1A1 to 1A4 Data Inputs
9, 7, 5, 3 2Y1 to 2Y4 Data Outputs

11, 13, 15,172A1 to 2A4 Data Inputs

18, 16, 14,121Y1 to 1Y4 Data Outputs

19 2G Output Enabel Input
10 GND Ground (0V)
20 V

CC

Positive Supply Voltage

18, 16, 14,121Y1 to 1Y4 Data Outputs

19 2G Output Enabel Input
10 GND Ground (0V)
20 V

CC

Positive Supply Voltage

PIN DESCRIPTION (HC 2 44 )

PIN No SYMBOL NAME AND FUNCTION

1 1G Output Enable Input
2, 4, 6, 8 1A1 to 1A4 Data Inputs
9, 7, 5, 3 2Y1 to 2Y4 Data Outputs

11, 13, 15,172A1 to 2A4 Data Inputs

18, 16, 14,121Y1 to 1Y4 Data Outputs

19 2G Output Enabel Input
10 GND Ground (0V)
20 V

CC

Positive Supply Voltage

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IEC LOGIC SYMBOLS

TRUTH TABLE

M54/M74HC240/241/244

HC244HC241HC240

INPUT OUTPUT

G G (HC241) An Yn (HC240) Yn (HC241) Yn (HC244)

LHLHLL
LHHLHH

X: ”H” or”L”
Z: High impedance

HLXZZZ

CIRCUIT SCHEMATIC (1/8 PACKAGE)

HC240 HC24 1/ 244

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M54/M74HC240/241/244

ABSOLU TE MAXIMU M R AT 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

AbsoluteMaximumRatingsarethosevaluesbeyondwhichdamagetothedevicemayoccur.Functionaloperationundertheseconditionisnotimplied.
(*)500 mW: ≅ 65oC derateto300 mWby 10mW/oC: 65oCto85oC

RECO MM ENDED O PERAT IN G C O NDI 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 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

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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