DATA SH EET
Product specification
File under Integrated Circuits, IC06 December 1990
INTEGRATED CIRCUITS
74HC/HCT540
Octal 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 buffer/line driver; 3-state;
inverting 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 OE1and OE2.
A HIGH on OEncauses the outputs to assume a high
impedance OFF-state.
The “540” is identical to the “541” but has 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 (PDin 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
HC HCT
tPHL/ tPLH propagation delay Anto YnCL= 15 pF; VCC = 5 V 9 11 ns
CIinput capacitance 3.5 3.5 pF
CPD power dissipation capacitance per buffer notes 1 and 2 39 44 pF
December 1990 3
Philips Semiconductors Product specification
Octal buffer/line driver; 3-state; inverting 74HC/HCT540
PIN DESCRIPTION
PIN NO. SYMBOL NAME AND FUNCTION
1, 19 OE1, OE2output enable input (active LOW)
2, 3, 4, 5, 6, 7, 8, 9 A0to A7data inputs
10 GND ground (0 V)
18, 17, 16, 15, 14, 13, 12, 11 Y0to Y7bus outputs
20 VCC positive supply voltage
Fig.1 Pin configuration. Fig.2 Logic symbol. Fig.3 IEC logic symbol.
December 1990 4
Philips Semiconductors Product specification
Octal buffer/line driver; 3-state; inverting 74HC/HCT540
Fig.4 Functional diagram.
FUNCTION TABLE
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
Z = high impedance OFF-state
INPUTS OUTPUT
OE1OE2AnYn
L
L
X
H
L
L
H
X
L
H
X
X
H
L
Z
Z
Fig.5 Logic diagram.
December 1990 5
Philips Semiconductors Product specification
Octal buffer/line driver; 3-state; inverting 74HC/HCT540
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”
.
Output capability: bus driver
ICC category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; tr= tf= 6 ns; CL= 50 pF
SYMBOL PARAMETER
Tamb (°C)
UNIT
TEST CONDITIONS
74HC VCC
(V) WAVEFORMS+25 −40 to +85 −40 to +125
min. typ. max. min. max. min. max.
tPHL/ tPLH propagation delay
Anto Yn
30
11
9
100
20
17
125
25
21
150
30
26
ns 2.0
4.5
6.0
Fig.6
tPZH/ tPZL 3-state output
enable time
OE to Yn
52
19
15
160
32
27
200
40
34
240
48
41
ns 2.0
4.5
6.0
Fig.7
tPHZ/ tPLZ 3-state output
disable time
OE to Yn
61
22
18
160
32
27
200
40
34
240
48
41
ns 2.0
4.5
6.0
Fig.7
tTHL/ tTLH output transition time 14
5
4
60
12
10
75
15
13
90
18
15
ns 2.0
4.5
6.0
Fig.6
December 1990 6
Philips Semiconductors Product specification
Octal buffer/line driver; 3-state; inverting 74HC/HCT540
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”
.
Output capability: bus driver
ICC category: MSI
Note to HCT types
The value of additional quiescent supply current (∆ICC) for a unit load of 1 is given in the family specifications.
To determine ∆ICC per input, multiply this value by the unit load coefficient shown in the table below.
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr= tf= 6 ns; CL= 50 pF
INPUT UNIT LOAD COEFFICIENT
OE1
OE2
An
1.50
1.00
1.40
SYMBOL PARAMETER
Tamb (°C)
UNIT
TEST CONDITIONS
74HCT VCC
(V) WAVEFORMS+25 −40 to +85 −40 to +125
min. typ. max. min. max. min. max.
tPHL/ tPLH propagation delay
Anto Yn
13 24 30 36 ns 4.5 Fig.6
tPZH/ tPZL 3-state
output enable time
OE to Yn
22 35 44 53 ns 4.5 Fig.7
tPHZ/ tPLZ 3-state output
disable time
OE to Yn
23 35 44 53 ns 4.5 Fig.7
tTHL/ tTLH output transition time 5 12 15 18 ns 4.5 Fig.6
December 1990 7
Philips Semiconductors Product specification
Octal buffer/line driver; 3-state; inverting 74HC/HCT540
AC WAVEFORMS
PACKAGE OUTLINES
See
“74HC/HCT/HCU/HCMOS Logic Package Outlines”
.
Fig.6 Waveforms showing the input (An) to output (Yn) propagation delays and the output transition times.
(1) HC : VM= 50%; VI= GND to VCC.
HCT: VM= 1.3 V; VI= GND to 3 V.
Fig.7 Waveforms showing the 3-state enable and disable times.
(1) HC : VM= 50%; VI= GND to VCC.
HCT: VM= 1.3 V; VI= GND to 3 V.
