74HC42 Philips, 74HC42 Datasheet - Page 2

• Manufacturer Part Number: 74HC42
• Description: BCD to decimal decoder 1-of-10
• Manufacturer: Philips

Philips Semiconductors
FEATURES
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; T
Notes
1. C
2. For HC the condition is V
ORDERING INFORMATION
See
December 1990
t
C
C
PHL
Mutually exclusive outputs
1-of-8 demultiplexing capability
Outputs disabled for input codes above nine
Output capability: standard
I
BCD to decimal decoder (1-of-10)
I
PD
SYMBOL
CC
f
f
C
V
For HCT the condition is V
i
o
“74HC/HCT/HCU/HCMOS Logic Package Information”
/ t
CC
PD
= input frequency in MHz
L
category: MSI
= output frequency in MHz
(C
PLH
= output load capacitance in pF
P
= supply voltage in V
is used to determine the dynamic power dissipation (P
L
D
= C
V
amb
CC
PD
2
propagation delay A
input capacitance
power dissipation capacitance per package
= 25 C; t
V
f
o
CC
) = sum of outputs
2
f
r
i
= t
I
= GND to V
I
f
= GND to V
= 6 ns
PARAMETER
(C
L
n
V
to Y
CC
2
n
CC
CC
f
o
) where:
1.5 V
2
.
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
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
demultiplexer application.
D
C
notes 1 and 2
in W):
L
= 15 pF; V
CONDITIONS
CC
= 5 V
14
3.5
37
3
) produces an useful inhibit
HC
TYPICAL
Product specification
74HC/HCT42
17
3.5
37
HCT
ns
pF
pF
UNIT
3