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INTEGRATED CIRCUITS
DATA SH EET
For a complete data sheet, please also download:
•The IC04 LOCMOS HE4000B Logic
Family Specifications HEF, HEC
•The IC04 LOCMOS HE4000B Logic
Package Outlines/Information HEF, HEC
HEF4556B
MSI
Dual 1-of-4 decoder/demultiplexer
Product specification
File under Integrated Circuits, IC04
January 1995
Page 2
Philips Semiconductors Product specification
Dual 1-of-4 decoder/demultiplexer
DESCRIPTION
The HEF4556B is a dual 1-of-4 decoder/demultiplexer.
Each has two address inputs (A0and A1), an active LOW
enable input (E) and four mutually exclusive outputs which
are active LOW (O0to O3). When used as a decoder,
E when HIGH, forces O0to O3HIGH. When used as a
demultiplexer, the appropriate output is selected by the
information on A0and A1with E as data input. All
unselected outputs are HIGH.
HEF4556B
MSI
Fig.2 Pinning diagram.
HEF4556BP(N): 16-lead DIL; plastic
(SOT38-1)
HEF4556BD(F): 16-lead DIL; ceramic (cerdip)
(SOT74)
HEF4556BT(D): 16-lead SO; plastic
(SOT109-1)
( ): Package Designator North America
Fig.1 Functional diagram.
PINNING
E enable inputs (active LOW)
A
and A
0
O0to O
FAMILY DATA, IDDLIMITS category MSI
See Family Specifications
1
3
address inputs
outputs (active LOW)
January 1995 2
Page 3
Philips Semiconductors Product specification
Dual 1-of-4 decoder/demultiplexer
Fig.3 Logic diagram (one decoder/multiplexer).
HEF4556B
MSI
TRUTH TABLE
INPUTS OUTPUTS
EA0A1O0O1O2O
LL L L H H H
LH L H L H H
LL H H H L H
LH H H H H L
HX X H H H H
Notes
1. H = HIGH state (the more positive voltage)
2. L = LOW state (the less positive voltage)
3. X = state is immaterial
3
January 1995 3
Page 4
Philips Semiconductors Product specification
Dual 1-of-4 decoder/demultiplexer
HEF4556B
AC CHARACTERISTICS
V
= 0 V; T
SS
Propagation delays
An→ O
HIGH to LOW 10 t
LOW to HIGH 10 t
En→ O
HIGH to LOW 10 t
LOW to HIGH 10 t
Output transition times 5 60 120 ns 10 ns + (1,0 ns/pF) C
HIGH to LOW 10 t
LOW to HIGH 10 t
=25°C; CL= 50 pF; input transition times ≤20 ns
amb
V
DD
V
n
5 130 255 ns 103 ns + (0,55 ns/pF) C
SYMBOL MIN. TYP. MAX.
PHL
15 35 65 ns 27 ns + (0,16 ns/pF) C
5 105 210 ns 78 ns + (0,55 ns/pF) C
PLH
15 30 60 ns 22 ns + (0,16 ns/pF) C
n
5 120 240 ns 93 ns + (0,55 ns/pF) C
PHL
15 30 60 ns 22 ns + (0,16 ns/pF) C
5 105 205 ns 78 ns + (0,55 ns/pF) C
PLH
15 30 60 ns 22 ns + (0,16 ns/pF) C
THL
15 20 40 ns 6 ns + (0,28 ns/pF) C
5 60 120 ns 10 ns + (1,0 ns/pF) C
TLH
15 20 40 ns 6 ns + (0,28 ns/pF) C
TYPICAL EXTRAPOLATION
FORMULA
50 100 ns 39 ns + (0,23 ns/pF) C
40 85 ns 29 ns + (0,23 ns/pF) C
45 90 ns 34 ns + (0,23 ns/pF) C
40 80 ns 29 ns + (0,23 ns/pF) C
30 60 ns 9 ns + (0,42 ns/pF) C
30 60 ns 9 ns + (0,42 ns/pF) C
MSI
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
V
DD
V
Dynamic power 5 4400 f
dissipation per 10 18 000 f
package (P) 15 43 300 f
TYPICAL FORMULA FOR P (µW)
+∑(foCL) × V
i
+∑(foCL) × V
i
+∑(foCL) × V
i
APPLICATION INFORMATION
Some examples of applications for the HEF4556B are:
• Code conversion.
• Address decoding.
• Demultiplexing: when using the enable input as data input.
January 1995 4
DD
DD
DD
2
2
2
where
fi= input freq. (MHz)
fo= output freq. (MHz)
C
= load capacitance (pF)
L
∑ (f
) = sum of outputs
oCL
= supply voltage (V)
V
DD
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