Philips 74hc hct242 DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

For a complete data sheet, please also download:

•The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications

•The IC06 74HC/HCT/HCU/HCMOS Logic Package Information

•The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines

74HC/HCT242

Quad bus transceiver; 3-state;
inverting

Product specification
File under Integrated Circuits, IC06

December 1990

Philips Semiconductors Product specification

Quad bus transceiver; 3-state; inverting 74HC/HCT242

FEATURES

• Inverting 3-state outputs

• 2-way asynchronous data bus communication

• Output capability: bus driver

• ICC category: MSI

(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.

The 74HC/HCT242 are quad bus transceivers featuring
inverting 3-state bus compatible outputs in both send and
receive directions.
They are designed for 4-line asynchronous 2-way data
communications between data buses.

GENERAL DESCRIPTION

The 74HC/HCT242 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL

The output enable inputs (
isolate the buses.

The “242” is similar to the “243” but has inverting outputs.

QUICK REFERENCE DATA

GND = 0 V; T

= 25 °C; tr= tf= 6 ns

amb

SYMBOL PARAMETER CONDITIONS

t

PHL

/ t

PLH

propagation delay

CL= 15 pF; VCC= 5 V 7 10 ns
Anto Bn;
Bnto A

n

C

I

C

I/O

C

PD

input capacitance 3.5 3.5 pF
input/output capacitance 10 10 pF
power dissipation capacitance per transceiver notes 1 and 2 29 32 pF

OEAand OEB) can be used to

TYPICAL

UNIT

HC HCT

Notes

1. C

is used to determine the dynamic power dissipation (PDin µW):

PD

PD= CPD× V

2

× fi+∑(CL× V

CC

2

× fo) where:

CC

fi= input frequency in MHz
fo= output frequency in MHz
∑ (CL× V

2

× fo) = sum of outputs

CC

CL= output load capacitance in pF
VCC= supply voltage in V

2. For HC the condition is VI= GND to V

CC

For HCT the condition is VI= GND to VCC− 1.5 V

ORDERING INFORMATION

“74HC/HCT/HCU/HCMOS Logic Package Information”

See

.

December 1990 2

Philips Semiconductors Product specification

Quad bus transceiver; 3-state; inverting 74HC/HCT242

PIN DESCRIPTION

PIN NO. SYMBOL NAME AND FUNCTION

1
2, 12 n.c. not connected
3, 4, 5, 6 A
7 GND ground (0 V)
11, 10, 9, 8 B
13 OE
14 V

OE

0

0

CC

A

to A

to B

B

output enable input (active LOW)

3

3

data inputs/outputs

data inputs/outputs
output enable input
positive supply voltage

Fig.1 Pin configuration. Fig.2 Logic symbol. Fig.3 IEC logic symbol.

December 1990 3