74HC42D [NXP]
BCD to decimal decoder 1-of-10; BCD十进制译码器1的10
| 型号： | 74HC42D |
| 厂家： | 
NXP |
| 描述： | BCD to decimal decoder 1-of-10 |
| 文件： | 总6页 (文件大小：46K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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)
December 1990
Product specification
File under Integrated Circuits, IC06
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
• Output capability: standard
• ICC category: MSI
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 (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
ns
HC
HCT
17
tPHL/ tPLH
CI
propagation delay An to Yn
input capacitance
CL = 15 pF; VCC = 5 V 14
3.5
37
3.5
37
pF
pF
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
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
GND
multiplexer outputs
ground (0 V)
8
15, 14, 13, 12
16
A0 to A3
VCC
data inputs
positive supply voltage
Fig.1 Pin configuration.
Fig.2 Logic symbol.
Fig.3 IEC logic symbol.
December 1990
3
Philips Semiconductors
Product specification
BCD to decimal decoder (1-of-10)
74HC/HCT42
FUNCTION TABLE
INPUTS
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
L
H
L
H
H
H
H
L
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
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
L
H
L
H
H
H
H
L
H
H
H
L
H
H
H
H
H
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
L
H
L
H
H
H
H
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
Fig.4 Functional diagram.
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
T
amb (°C)
74HC
TEST CONDITIONS
SYMBOL PARAMETER
UNIT
WAVEFORMS
VCC
(V)
+25
−40 to +85
−40 to +125
min. typ. max. min. max. min. max.
tPHL/ tPLH propagation delay
An to Yn
47
17
14
150
30
26
190
38
33
225
45
38
ns
ns
2.0
4.5
6.0
Fig.6
Fig.6
t
THL/ tTLH output transition time
19
7
6
75
15
13
95
19
16
110
22
19
2.0
4.5
6.0
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
UNIT
WAVEFORMS
VCC
(V)
+25
−40 to +85 −40 to +125
min. typ. max. min. max. min. max.
t
t
PHL/ tPLH propagation delay
An to Yn
20
35
44
53
ns
ns
4.5
4.5
Fig.6
Fig.6
THL/ tTLH output transition time
7
15
19
22
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
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