74HC91 datasheet(2/7 Pages) PHILIPS

2 / 7 page

December 1990

Philips Semiconductors

Product speciﬁcation

Nine wide Schmitt trigger buffer;

open drain outputs

74HC/HCT9115

FEATURES

• Schmitt trigger action on all data inputs

• Output capability: standard (open drain)

• ICC category: MSI

GENERAL DESCRIPTION

The 74HC/HCT9115 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/HCT9115 are nine wide Schmitt trigger buffer

with open drain outputs and Schmitt trigger inputs.

The Schmitt trigger action in the data inputs transform

slowly changing input signals into sharply defined

jitter-free output signals.

The 74HC/HCT9115 have open-drain N-transistor

outputs, which are not clamped by a diode connected to

VCC. In the OFF-state, i.e. when one input is HIGH, the

output may be pulled to any voltage between GND and

VOmax. This allows the device to be used as a

LOW-to-HIGH or HIGH-to-LOW level shifter. For digital

operation and OR-tied output applications, these devices

must have a pull-up resistor to establish a logic HIGH level.

The “9115” is identical to the “9114” but has non-inverting

outputs.

QUICK REFERENCE DATA

GND = 0 V; Tamb =25 °C; tr =tf = 6 ns

Notes

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

PD =CPD × VCC2 × fi +∑ (CL × VCC2 × fo) where:

fi = input frequency in MHz

fo = output frequency in MHz

∑ (CL × VCC2 × fo) = sum of outputs

CL = output load capacitance in pF

VCC = supply voltage in V

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

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

HCT

tPHL/ tPLZ

propagation delay An to Yn

CL = 15 pF; VCC = 5 V

input capacitance

3.5

CPD

power dissipation capacitance per buffer

notes 1 and 2

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