PHILIPS 74HCT42N

INTEGRATED CIRCUITS
DATA SHEET
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
Philips Semiconductors
Product specification
BCD to decimal decoder (1-of-10)
74HC/HCT42
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.
FEATURES
• Mutually exclusive outputs
• 1-of-8 demultiplexing capability
• Outputs disabled for input codes above nine
The logic design of the “42” ensures that all outputs are
HIGH when binary codes greater than nine are applied to
the inputs.
• Output capability: standard
• ICC category: MSI
The most significant input (A3) produces an useful inhibit
function when the “42” is used as a 1-of-8 decoder. The A3
input can also be used as the data input in an 8-output
demultiplexer application.
GENERAL DESCRIPTION
The 74HC/HCT42 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; Tamb = 25 °C; tr = tf = 6 ns
TYPICAL
SYMBOL
PARAMETER
CONDITIONS
UNIT
HC
tPHL/ tPLH
propagation delay An to Yn
CL = 15 pF; VCC = 5 V
CI
input capacitance
CPD
power dissipation capacitance per package
notes 1 and 2
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”.
December 1990
2
HCT
14
17
ns
3.5
3.5
pF
37
37
pF
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
Y0 to Y9
multiplexer outputs
8
GND
ground (0 V)
15, 14, 13, 12
A0 to A3
data inputs
16
VCC
positive supply voltage
Fig.1 Pin configuration.
December 1990
Fig.2 Logic symbol.
3
Fig.3 IEC logic symbol.
Philips Semiconductors
Product specification
BCD to decimal decoder (1-of-10)
74HC/HCT42
FUNCTION TABLE
INPUTS
Fig.4 Functional diagram.
OUTPUTS
A3
A2
A1
A0
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y8
Y9
L
L
L
L
L
L
L
L
L
L
H
H
L
H
L
H
L
H
H
H
H
L
H
H
H
H
L
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
H
H
L
L
L
L
H
H
H
H
L
L
H
H
L
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
L
H
H
H
H
L
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
H
H
L
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
L
L
H
H
L
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
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
Fig.5 Logic diagram.
December 1990
4
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; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
74HC
SYMBOL PARAMETER
+25
min. typ.
max.
−40 to +85
−40 to +125
min. max.
min.
UNIT
VCC WAVEFORMS
(V)
max.
tPHL/ tPLH
propagation delay
An to Yn
47
17
14
150
30
26
190
38
33
225
45
38
ns
2.0
4.5
6.0
Fig.6
tTHL/ tTLH
output transition time
19
7
6
75
15
13
95
19
16
110
22
19
ns
2.0
4.5
6.0
Fig.6
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
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.
INPUT
UNIT LOAD COEFFICIENT
An
1.0
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
74HCT
SYMBOL PARAMETER
+25
min.
typ.
max.
−40 to +85
−40 to +125
min. max.
min.
UNIT
VCC WAVEFORMS
(V)
max.
tPHL/ tPLH
propagation delay
An to Yn
20
35
44
53
ns
4.5
Fig.6
tTHL/ tTLH
output transition time
7
15
19
22
ns
4.5
Fig.6
December 1990
5
Philips Semiconductors
Product specification
BCD to decimal decoder (1-of-10)
74HC/HCT42
AC WAVEFORMS
(1) HC : VM = 50%; VI = GND to VCC.
HCT: VM = 1.3 V; VI = GND to 3 V.
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