Page 1
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
HEF4028B
MSI
1-of-10 decoder
Product specification
File under Integrated Circuits, IC04
January 1995
Page 2
Philips Semiconductors Product specification
1-of-10 decoder
DESCRIPTION
The HEF4028B is a 4-bit BCD to 1-of-10 active HIGH
decoder. A 1-2-4-8 BCD code applied to inputs A0 to A
causes the selected output to be HIGH, the other nine will
be LOW. If desired, the device may be used as a 1-of-8
decoder with enable; 3-bit octal inputs are applied to inputs
A0, A1 and A2 selecting an output O0 to O7. Input A3 then
becomes an active LOW enable, forcing the selected
output LOW when A3 is HIGH. The HEF4028B may also
be used as an 8-output (O0 to O7) demultiplexer with A0 to
as address inputs and A3 as an active LOW data input.
A
2
The outputs are fully buffered for best performance.
3
HEF4028B
MSI
Fig.2 Pinning diagram.
Fig.1 Functional diagram.
HEF4028BP(N): 16-lead DIL; plastic
HEF4028BD(F): 16-lead DIL; ceramic (cerdip)
HEF4028BT(D): 16-lead SO; plastic
( ): Package Designator North America
PINNING
A
to A
0
3
O
to O
0
9
FAMILY DATA, I
See Family Specifications
(SOT38-1)
(SOT74)
(SOT109-1)
address inputs, 1-2-4-8 BCD
outputs (active HIGH)
LIMITS category MSI
DD
January 1995 2
Page 3
Philips Semiconductors Product specification
1-of-10 decoder
HEF4028B
MSI
Fig.3 Logic diagram.
January 1995 3
Page 4
Philips Semiconductors Product specification
1-of-10 decoder
HEF4028B
TRUTH TABLE
INPUTS OUTPUTS
A
LLLLH LLLLLLLLL
LLLHL HLLLLLLLL
LLHL L LHLLLLLLL
LLHHL LLHLLLLLL
LHLL L L LLHLLLLL
LHLH L LLLLHLLLL
LHHL L L LLLLHLLL
LHHH L LLLLLLHLL
HLLL L LLLLLLLHL
HLLH L LLLLLLLLH
HLHL L LLLLLLLLL
HLHH L LLLLLLLLL
HHL L L L LLLLLLL L
HHLH L L LLLLLLL L
HHHL L L LLLLLLLL
HHHH L L LLLLL LLL
A
3
A
2
A
1
O
0
0
O
O
O
O
1
2
3
O
4
O
5
O
6
O
7
O
8
MSI
9
(2)
Notes
1. H = HIGH state (the more positive voltage)
L = LOW state (the less positive voltage)
2. Extraordinary states.
January 1995 4
Page 5
Philips Semiconductors Product specification
1-of-10 decoder
AC CHARACTERISTICS
V
=0V; T
SS
Propagation delays
An→ O
HIGH to LOW 10 40 80 ns 29 ns + (0,23 ns/pF) C
LOW to HIGH 10 40 80 ns 29 ns + (0,23 ns/pF) C
Output transition times 5
HIGH to LOW 10 30 60 ns 9 ns + (0,42 ns/pF) C
LOW to HIGH 10 t
=25°C; CL= 50 pF; input transition times ≤ 20 ns
amb
V
DD
V
n
5
SYMBOL TYP. MAX.
t
PHL
15 30 60 ns 22 ns + (0,16 ns/pF) C
5
t
PLH
15 30 60 ns 22 ns + (0,16 ns/pF) C
t
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
100 200 ns 73 ns + (0,55 ns/pF) C
90 180 ns 63 ns + (0,55 ns/pF) C
60 120 ns 10 ns + (1,0 ns/pF) C
30 60 ns 9 ns + (0,42 ns/pF) C
HEF4028B
MSI
L
L
L
L
L
L
L
L
L
L
L
L
V
DD
V
TYPICAL FORMULA FOR P (µW)
Dynamic power 5 350 f
dissipation per 10 2 200 f
package (P) 15 7 350 f
+∑(foCL) × V
i
+∑(foCL) × V
i
+∑(foCL) × V
i
DD
DD
DD
2
2
2
where
fi= input freq. (MHz)
fo= output freq. (MHz)
C
= total load cap. (pF)
L
) = sum of outputs
∑ (f
oCL
V
= supply voltage (V)
DD
January 1995 5
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