Philips 74HCT7540U, 74HCT7540D, 74HC7540U, 74HC7540N, 74HC7540DB Datasheet

DATA SH EET

Product specification
Supersedes data of March 1988
File under Integrated Circuits, IC06

December 1990

INTEGRATED CIRCUITS

74HC/HCT7540

Octal Schmitt trigger buffer/line
driver; 3-state; inverting

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

December 1990 2

Philips Semiconductors Product specification

Octal Schmitt trigger buffer/line driver;
3-state; inverting

74HC/HCT7540

FEATURES

• Inverting outputs

• Schmitt trigger action on all data inputs

• Output capability: bus driver

• ICC category: MSI

GENERAL DESCRIPTION

The 74HC/HCT7540 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/HCT7540 are octal Schmitt trigger inverting
buffer/line drivers with 3-state outputs. The 3-state outputs
are controlled by the output enable inputs

OE1 and OE2.

A HIGH on OEn causes the outputs to assume a high
impedance OFF-state.

The Schmitt trigger action in the data inputs transforms
slowly changing input signals into sharply defined
jitter-free output signals.

The “7540” is identical to the “540” but has hysteresis on
the data inputs.

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 Y

n

CL= 15 pF; VCC=5 V 11 16 ns

C

I

input capacitance 3.5 3.5 pF

C

PD

power dissipation capacitance per buffer notes 1 and 2 29 31 pF

December 1990 3

Philips Semiconductors Product specification

Octal Schmitt trigger buffer/line driver;
3-state; inverting

74HC/HCT7540

PIN DESCRIPTION

PIN NO. SYMBOL NAME AND FUNCTION

1, 19

OE1, OE

2

output enable inputs (active LOW)

2, 3, 4, 5, 6, 7, 8, 9 A

0

to A

7

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

Y0 to Y

7

bus outputs
20 V

CC

positive supply voltage

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