Datasheet HD74HCT243, HD74HCT242 Datasheet (HIT)

HD74HCT242/HD74HCT243

Quad. Bus Transceivers (with 3-state outputs)

Description

The HD74HCT242 is an inverting buffer and the HD74HCT243 is a noninverting buffer. Each device has
one active high enable (GBA), and one active low enable (GAB). GBA enables the A outputs and GAB
enables the B outputs.

The device does not have schmitt trigger inputs.

Features

• LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility

• High Speed Operation: tpd (A to Y) = 9.5 ns typ (CL = 50 pF)

• High Output Current: Fanout of 15 LSTTL Loads

• Wide Operating Voltage: VCC = 4.5 to 5.5 V

• Low Input Current: 1 µA max

• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)

Function Table

HD74HCT242 HD74HCT243

Control Inputs Data Port Status Data Port Status

G

AB

HH O IOI
LHZZZZ
HLZZZZ
LL I O IO

I : Input
O : Output
O : Inverting Output
Z : High Impedance

G

BA

ABAB

HD74HCT242/HD74HCT243

(

)

Pin Arrangement

Block Diagram

HD74HCT242

GAB

NC

1A

2A

3A

4A

GND

1

2

3

4

5

6

7

14

13

12

11

10

V

CC

GBA

NC

1B

2B

3B

9

4B

8

Top view

V

CC

A

1 of 4
Transceivers

V

CC

B

GBA

GAB

2

HD74HCT243

A

GBA

GAB

Absolute Maximum Ratings

1 of 4
Transceivers

V

CC

HD74HCT242/HD74HCT243

V

CC

B

Item Symbol Rating Unit

Supply voltage range V
Input voltage V
Output voltage V
DC current drain per pin I

CC

IN

OUT

OUT

DC current drain per VCC, GND ICC, I
DC input diode current I
DC output diode current I
Power dissipation per package P

IK

OK

T

GND

–0.5 to +7.0 V
–0.5 to VCC + 0.5 V
–0.5 to VCC + 0.5 V

±35 mA
±75 mA
±20 mA
±20 mA

500 mW

Storage temperature Tstg –65 to +150 °C

3

HD74HCT242/HD74HCT243

DC Characteristics

Ta = –40 to

Ta = 25°C

Item Symbol Min Typ Max Min Max Unit V

Input voltage V

Output voltage V

IH

V

IL

OH

2.0 — — 2.0 — V 4.5 to

— — 0.8 — 0.8 V 4.5 to

4.4 — — 4.4 — V 4.5 Vin = VIH or VILIOH = –20 µA

4.18 — — 4.13 — 4.5 IOH = –6 mA

V

OL

— — 0.1 — 0.1 V 4.5 Vin = VIH or VILIOL = 20 µA
— — 0.26 — 0.33 4.5 IOL = 6 mA

Off-state output

I

OZ

——±0.5 — ±5.0 µA 5.5 Vin = VIH or VIL,

current
Input current Iin — — ±0.1 — ±1.0 µA 5.5 Vin = VCC or GND
Quiescent current I

CC

— — 4.0 — 40 µA 5.5 Vin = VCC or GND, Iout = 0 µA

+85°C Test Conditions

(V)

CC

5.5

5.5

Vout = V

or GND

CC

AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)

Ta = –40 to

Ta = 25°C

Item Symbol Min Typ Max Min Max Unit V

Propagation delay t
time t
Output enable t
time t
Output disable t
time t
Output rise/fall

time

PHL

PLH

ZL

ZH

LZ

HZ

t

TLH

t

THL

— 10 18 — 22 ns 4.5
— 9 18 — 22 4.5
— 14 30 — 38 ns 4.5
— 13 30 — 38 4.5
— 16 30 — 38 ns 4.5
— 17 30 — 38 4.5
— 4 12 — 15 ns 4.5

Input capacitance Cin — 5 10 — 10 pF —

+85°C Test Conditions

(V)

CC

4

1

19.20

20.32 Max

1.30

Unit: mm

814

6.30

7.40 Max

7

2.54 ± 0.25

2.39 Max

0.48 ± 0.10

2.54 Min 5.06 Max

0.51 Min

Hitachi Code
JEDEC
EIAJ
Weight

7.62

+ 0.10

0.25

– 0.05

0° – 15°

(reference value)

DP-14
Conforms
Conforms

0.97 g

14

1.27

10.5 Max

1

10.06

1.42 Max

Unit: mm

8

5.5

7

+ 0.20

7.80

– 0.30

2.20 Max
*0.22 ± 0.05

1.15

0.20 ± 0.04
0° – 8°

0.70 ± 0.20

*0.42 ± 0.08

0.40 ± 0.06

*Dimension including the plating thickness

Base material dimension

0.12

0.10 ± 0.10

0.15

M

Hitachi Code
JEDEC
EIAJ

(reference value)

Weight

FP-14DA
—
Conforms

0.23 g

9.05 Max

14

Unit: mm

8.65

8

*Pd plating

1

0.635 Max

1.27

*0.40 ± 0.06

7

+ 0.11

– 0.04

0.14

0.25

3.95

1.75 Max

0.15

M

6.10

1.08

*0.20 ± 0.05

0.60

Hitachi Code
JEDEC
EIAJ
Weight

+ 0.10
– 0.30

0° – 8°

+ 0.67
– 0.20

(reference value)

FP-14DN
Conforms
Conforms

0.13 g

Cautions

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received the latest product standards or specifications before final design, purchase or use.

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contact Hitachi’s sales office before using the product in an application that demands especially high
quality and reliability or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.

4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly
for maximum rating, operating supply voltage range, heat radiation characteristics, installation
conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used
beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable
failure rates or failure modes in semiconductor devices and employ systemic measures such as fail­safes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other
consequential damage due to operation of the Hitachi product.

5. This product is not designed to be radiation resistant.

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products.

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