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INTEGRATED CIRCUITS
DATA SH EET
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
74HC/HCT540
Octal buffer/line driver; 3-state;
inverting
Product specification
File under Integrated Circuits, IC06
December 1990
Page 2
Philips Semiconductors Product specification
Octal buffer/line driver; 3-state;
inverting
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.
QUICK REFERENCE DATA
GND = 0 V; T
= 25 °C; tr= tf= 6 ns
amb
SYMBOL PARAMETER CONDITIONS
t
PHL
C
C
I
PD
/ t
PLH
propagation delay Anto Y
n
input capacitance 3.5 3.5 pF
power dissipation capacitance per buffer notes 1 and 2 39 44 pF
The 74HC/HCT540 are octal inverting buffer/line drivers
with 3-state outputs. The 3-state outputs are controlled by
the output enable inputs
A HIGH on OEncauses the outputs to assume a high
impedance OFF-state.
The “540” is identical to the “541” but has inverting outputs.
CL= 15 pF; VCC= 5 V 9 11 ns
74HC/HCT540
OE1and OE2.
TYPICAL
UNIT
HC HCT
Notes
1. C
is used to determine the dynamic power dissipation (PDin µW):
PD
PD= CPD× V
2
× fi+∑(CL× V
CC
2
× fo) where:
CC
fi= input frequency in MHz
fo= output frequency in MHz
∑ (CL× V
2
× fo) = sum of outputs
CC
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
“74HC/HCT/HCU/HCMOS Logic Package Information”
See
.
December 1990 2
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Philips Semiconductors Product specification
Octal buffer/line driver; 3-state; inverting 74HC/HCT540
PIN DESCRIPTION
PIN NO. SYMBOL NAME AND FUNCTION
1, 19
2, 3, 4, 5, 6, 7, 8, 9 A
10 GND ground (0 V)
18, 17, 16, 15, 14, 13, 12, 11
20 V
OE1, OE
to A
0
Y0to Y
CC
2
7
7
output enable input (active LOW)
data inputs
bus outputs
positive supply voltage
Fig.1 Pin configuration. Fig.2 Logic symbol. Fig.3 IEC logic symbol.
December 1990 3
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Philips Semiconductors Product specification
Octal buffer/line driver; 3-state; inverting 74HC/HCT540
FUNCTION TABLE
INPUTS OUTPUT
Fig.4 Functional diagram.
OE
H
1
L
L
X
OE
H
X
2
L
L
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
Z = high impedance OFF-state
A
n
L
H
X
X
Y
n
H
L
Z
Z
Fig.5 Logic diagram.
December 1990 4
Page 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
ICCcategory: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; t
= tf= 6 ns; CL= 50 pF
r
SYMBOL PARAMETER
t
PHL
t
PZH
/ t
/ t
propagation delay
PLH
Anto Y
3-state output
PZL
n
enable time
t
PHZ
OE to Y
/ t
3-state output
PLZ
n
disable time
t
THL
OE to Y
/ t
output transition time 14
TLH
n
(°C)
T
amb
74HC
min. typ. max. min. max. min. max.
30
11
9
52
19
15
61
22
18
5
4
100
20
17
160
32
27
160
32
27
60
12
10
125
25
21
200
40
34
200
40
34
75
15
13
150
30
26
240
48
41
240
48
41
90
18
15
.
UNIT
ns 2.0
ns 2.0
ns 2.0
ns 2.0
TEST CONDITIONS
V
CC
WAVEFORMS+25 −40 to +85 −40 to +125
(V)
Fig.6
4.5
6.0
Fig.7
4.5
6.0
Fig.7
4.5
6.0
Fig.6
4.5
6.0
December 1990 5
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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
ICCcategory: MSI
Note to HCT types
The value of additional quiescent supply current (∆I
) for a unit load of 1 is given in the family specifications.
CC
To determine ∆ICCper input, multiply this value by the unit load coefficient shown in the table below.
INPUT UNIT LOAD COEFFICIENT
OE
OE
A
1
2
n
1.50
1.00
1.40
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t
= tf= 6 ns; CL= 50 pF
r
T
amb
(°C)
TEST CONDITIONS
74HCT
SYMBOL PARAMETER
UNIT
V
(V)
min. typ. max. min. max. min. max.
t
PHL
t
PZH
/ t
/ t
propagation delay
PLH
Anto Y
3-state
PZL
13 24 30 36 ns 4.5 Fig.6
n
22 35 44 53 ns 4.5 Fig.7
output enable time
t
PHZ
OE to Y
/ t
3-state output
PLZ
n
23 35 44 53 ns 4.5 Fig.7
disable time
t
THL
OE to Y
/ t
output transition time 5 12 15 18 ns 4.5 Fig.6
TLH
n
CC
WAVEFORMS+25 −40 to +85 −40 to +125
December 1990 6
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Philips Semiconductors Product specification
Octal buffer/line driver; 3-state; inverting 74HC/HCT540
AC WAVEFORMS
(1) HC : VM= 50%; VI= GND to VCC.
= 1.3 V; VI= GND to 3 V.
HCT: V
M
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.
= 1.3 V; VI= GND to 3 V.
HCT: V
M
Fig.7 Waveforms showing the 3-state enable and disable times.
PACKAGE OUTLINES
“74HC/HCT/HCU/HCMOS Logic Package Outlines”
See
.
December 1990 7
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