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74HC540 Datasheet, PDF (2/7 Pages) NXP Semiconductors – Octal buffer/line driver; 3-state; inverting | |||
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Philips Semiconductors
Octal buffer/line driver; 3-state;
inverting
Product speciï¬cation
74HC/HCT540
FEATURES
⢠Inverting outputs
⢠Output capability: bus driver
⢠ICC category: MSI
GENERAL DESCRIPTION
The 74HC/HCT540 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/HCT540 are octal 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 â540â is identical to the â541â but has inverting outputs.
QUICK REFERENCE DATA
GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns
SYMBOL
PARAMETER
CONDITIONS
tPHL/ tPLH
CI
CPD
propagation delay An to Yn
input capacitance
CL = 15 pF; VCC = 5 V
power dissipation capacitance per buffer notes 1 and 2
Notes
1. CPD is used to determine the dynamic power dissipation (PD in µW):
PD = CPD Ã VCC2 Ã fi + â (CL Ã VCC2 Ã fo) where:
fi = input frequency in MHz
fo = output frequency in MHz
â (CL Ã VCC2 Ã 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 â 1.5 V
ORDERING INFORMATION
See â74HC/HCT/HCU/HCMOS Logic Package Informationâ.
TYPICAL
HC
9
3.5
39
HCT
11
3.5
44
UNIT
ns
pF
pF
December 1990
2
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