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Toshiba Electronic Components Datasheet

TC74HC42AP Datasheet

BCD to Decimal Decoder

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TC74HC42AP/AF
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74HC42AP, TC74HC42AF
BCD to Decimal Decoder
The TC74HC42A is a high speed CMOS BCD-to-DECIMAL
DECODER fabricated with silicon gate C2MOS technology.
It achieves the high speed operation similar to equivalent
LSTTL while maintaining the CMOS low power dissipation.
A BCD code applied to the four inputs (A-D) sets a low level at
one of ten decoded outputs. A illegal BCD code such as eleven
thru fifteen sets all outputs high. This device can be used as
3-to-8 LINE DECODER when input D is held low.
This device is useful for code conversion, address decoding,
memory selection, multiplexing, or readout decoding.
All inputs are equipped with protection circuits against static
discharge or transient excess voltage.
Features
High speed: tpd = 13 ns (typ.) at VCC = 5 V
Low power dissipation: ICC = 4 μA (max) at Ta = 25°C
High noise immunity: VNIH = VNIL = 28% VCC (min)
Output drive capability: 10 LSTTL loads
Symmetrical output impedance: |IOH| = IOL = 4 mA (min)
Balanced propagation delays: tpLH ∼− tpHL
Wide operating voltage range: VCC (opr) = 2 to 6 V
Pin and function compatible with 74LS42
Pin Assignment
TC74HC42AP
TC74HC42AF
Weight
DIP16-P-300-2.54A
SOP16-P-300-1.27A
: 1.00 g (typ.)
: 0.18 g (typ.)
Start of commercial production
1987-11
1
2014-03-01


Toshiba Electronic Components Datasheet

TC74HC42AP Datasheet

BCD to Decimal Decoder

No Preview Available !

IEC Logic Symbol
TC74HC42AP/AF
Truth Table
Code
BCD Inputs
Decimal Outputs
No.
D
C
B
A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9
0
L
L
L
L
L
H
H
H
H
H
H
H
H
H
1
L
L
L
H
H
L
H
H
H
H
H
H
H
H
2
L
L
H
L
H
H
L
H
H
H
H
H
H
H
3
L
L
H
H
H
H
H
L
H
H
H
H
H
H
4
L
H
L
L
H
H
H
H
L
H
H
H
H
H
5
L
H
L
H
H
H
H
H
H
L
H
H
H
H
6
L
H
H
L
H
H
H
H
H
H
L
H
H
H
7
L
H
H
H
H
H
H
H
H
H
H
L
H
H
8
H
L
L
L
H
H
H
H
H
H
H
H
L
H
9
H
L
L
H
H
H
H
H
H
H
H
H
H
L
H
X
H
X
H
H
H
H
H
H
H
H
H
H
H
H
X
X
H
H
H
H
H
H
H
H
H
H
X: Don’t care
System Diagram
2
2014-03-01


Part Number TC74HC42AP
Description BCD to Decimal Decoder
Maker Toshiba
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TC74HC42AP Datasheet PDF






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