Philips 74HC,HCT245 Datasheet

DATA SH EET

Product specification
File under Integrated Circuits, IC06

September 1993

INTEGRATED CIRCUITS

74HC/HCT245

Octal bus transceiver; 3-state

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

September 1993 2

Philips Semiconductors Product specification

Octal bus transceiver; 3-state 74HC/HCT245

FEATURES

• Octal bidirectional bus interface

• Non-inverting 3-state outputs

• Output capability: bus driver

• ICC category: MSI

GENERAL DESCRIPTIONS

The 74HC/HCT245 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.

The 74HC/HCT245 are octal transceivers featuring
non-inverting 3-state bus compatible outputs in both send
and receive directions. The “245” features an output
enable (OE) input for easy cascading and a send/receive
(DIR) for direction control. OE controls the outputs so that
the buses are effectively isolated. The “245” is similar to
the “640” but has true (non-inverting) outputs.

QUICK REFERENCE DATA

GND = 0 V; T

amb

=25°C; tr=tf= 6 ns

Notes

1. C

PD

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

PD=CPD× V

CC

2

× fi+∑ (CL× V

CC

2

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

CC

2

× fo) = sum of outputs
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

See

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

.

SYMBOL PARAMETER CONDITIONS

TYPICAL

UNIT

HC HCT

t

PHL

/ t

PLH

propagation delay

An to Bn;Bn to A

n

CL= 15 pF; VCC=5V 7 10 ns

C

I

input capacitance 3.5 3.5 pF

C

I/O

input/output capacitance 10 10 pF

C

PD

power dissipation capacitance per transceiver notes 1 and 2 30 30 pF

September 1993 3

Philips Semiconductors Product specification

Octal bus transceiver; 3-state 74HC/HCT245

PIN DESCRIPTION

PIN NO. SYMBOL NAME AND FUNCTION

1 DIR direction control
2, 3, 4, 5, 6, 7, 8, 9 A

0

to A

7

data inputs/outputs
10 GND ground (0 V)
18, 17, 16, 15, 14, 13, 12, 11 B

0

to B

7

data inputs/outputs
19

OE output enable input (active LOW)

20 V

CC

positive supply voltage

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