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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/HCT42
BCD to decimal decoder (1-of-10)
Product specification
File under Integrated Circuits, IC06
December 1990
Page 2
Philips Semiconductors Product specification
BCD to decimal decoder (1-of-10) 74HC/HCT42
FEATURES
• Mutually exclusive outputs
• 1-of-8 demultiplexing capability
• Outputs disabled for input codes above nine
• Output capability: standard
• ICC category: MSI
The 74HC/HCT42 decoders accept four active HIGH BCD
inputs and provide 10 mutually exclusive active LOW
outputs. The active LOW outputs facilitate addressing
other MSI circuits with active LOW input enables.
The logic design of the “42” ensures that all outputs are
HIGH when binary codes greater than nine are applied to
the inputs.
The most significant input (A
GENERAL DESCRIPTION
function when the “42” is used as a 1-of-8 decoder. The A
input can also be used as the data input in an 8-output
The 74HC/HCT42 are high-speed Si-gate CMOS devices
demultiplexer application.
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
CL= 15 pF; VCC= 5 V 14 17 ns
input capacitance 3.5 3.5 pF
power dissipation capacitance per package notes 1 and 2 37 37 pF
) produces an useful inhibit
3
TYPICAL
UNIT
HC HCT
3
Notes
1. C
is used to determine the dynamic power dissipation (PD in 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
Page 3
Philips Semiconductors Product specification
BCD to decimal decoder (1-of-10) 74HC/HCT42
PIN DESCRIPTION
PIN NO. SYMBOL NAME AND FUNCTION
1, 2, 3, 4, 5, 6, 7, 9, 10, 11
8 GND ground (0 V)
15, 14, 13, 12 A
16 V
Y0 to Y
to A
0
CC
9
3
multiplexer outputs
data inputs
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
BCD to decimal decoder (1-of-10) 74HC/HCT42
FUNCTION TABLE
INPUTS OUTPUTS
Fig.4 Functional diagram.
A3A2A1A0Y0Y1Y2Y3Y4Y5Y6Y7Y8Y
L
L
L
L
L
H
H
H
H
H
H
H
H
L
L
L
H
H
L
H
H
H
H
H
H
H
L
L
H
L
H
H
L
H
H
H
H
H
H
L
L
H
H
H
H
H
L
H
H
H
H
H
L
H
L
L
H
H
H
H
L
H
H
H
H
L
H
L
H
H
H
H
H
H
L
H
H
H
L
H
H
L
H
H
H
H
H
H
L
H
H
L
H
H
H
H
H
H
H
H
H
H
L
H
H
L
L
L
H
H
H
H
H
H
H
H
L
H
L
L
H
H
H
H
H
H
H
H
H
H
H
L
H
L
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
Note
1. H = HIGH voltage level
L = LOW voltage level
9
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
Fig.5 Logic diagram.
December 1990 4
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Philips Semiconductors Product specification
BCD to decimal decoder (1-of-10) 74HC/HCT42
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”
Output capability: standard
ICC category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; t
= 6 ns; CL= 50 pF
r=tf
SYMBOL PARAMETER
t
PHL
t
THL
/ t
/ t
propagation delay
PLH
Anto Y
n
output transition time 19
TLH
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”
T
(°C) TEST CONDITIONS
amb
74HC
+25 −40 to +85 −40 to +125
min. typ. max. min. max. min. max.
47
17
14
7
6
150
30
26
75
15
13
190
38
33
95
19
16
225
45
38
110
22
19
.
UNIT
ns 2.0
ns 2.0
.
V
(V)
4.5
6.0
4.5
6.0
CC
WAVEFORMS
Fig.6
Fig.6
Output capability: standard
ICC category: 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 ∆ICC per input, multiply this value by the unit load coefficient shown in the table below.
INPUT UNIT LOAD COEFFICIENT
A
n
1.0
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t
= 6 ns; CL= 50 pF
r=tf
(°C) TEST CONDITIONS
T
amb
74HCT
SYMBOL PARAMETER
+25 −40 to +85 −40 to +125
UNIT
V
(V)
CC
min. typ. max. min. max. min. max.
t
PHL
t
THL
/ t
/ t
propagation delay
PLH
Anto Y
n
output transition time 7 15 19 22 ns 4.5 Fig.6
TLH
20 35 44 53 ns 4.5 Fig.6
WAVEFORMS
December 1990 5
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Philips Semiconductors Product specification
BCD to decimal decoder (1-of-10) 74HC/HCT42
AC WAVEFORMS
(1) HC : VM= 50%; VI= GND to VCC.
HCT: V
= 1.3 V; VI= GND to 3 V.
M
Fig.6 Waveforms showing the input (An) to output (Yn) propagation delays and the output transition times.
PACKAGE OUTLINES
See
“74HC/HCT/HCU/HCMOS Logic Package Outlines”
.
December 1990 6
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