Page 1
DATA SH EET
Product specification
File under Integrated Circuits, IC04
January 1995
INTEGRATED CIRCUITS
HEF4028B
MSI
1-of-10 decoder
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
Page 2
January 1995 2
Philips Semiconductors Product specification
1-of-10 decoder
HEF4028B
MSI
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
3
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
A
2
as address inputs and A3 as an active LOW data input.
The outputs are fully buffered for best performance.
Fig.1 Functional diagram.
Fig.2 Pinning diagram.
PINNING
FAMILY DATA, I
DD
LIMITS category MSI
See Family Specifications
HEF4028BP(N): 16-lead DIL; plastic
(SOT38-1)
HEF4028BD(F): 16-lead DIL; ceramic (cerdip)
(SOT74)
HEF4028BT(D): 16-lead SO; plastic
(SOT109-1)
( ): Package Designator North America
A
0
to A
3
address inputs, 1-2-4-8 BCD
O
0
to O
9
outputs (active HIGH)
Page 3
January 1995 3
Philips Semiconductors Product specification
1-of-10 decoder
HEF4028B
MSI
Fig.3 Logic diagram.
Page 4
January 1995 4
Philips Semiconductors Product specification
1-of-10 decoder
HEF4028B
MSI
TRUTH TABLE
Notes
1. H = HIGH state (the more positive voltage)
L = LOW state (the less positive voltage)
2. Extraordinary states.
INPUTS OUTPUTS
A
3
A
2
A
1
A
0
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
O
8
O
9
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
(2)
HLHH L LLLLLLLLL
HHL L L L LLLLLLL L
HHLH L L LLLLLLL L
HHHL L L LLLLLLLL
HHHH L L LLLLL LLL
Page 5
January 1995 5
Philips Semiconductors Product specification
1-of-10 decoder
HEF4028B
MSI
AC CHARACTERISTICS
V
SS
=0V; T
amb
=25°C; CL= 50 pF; input transition times ≤ 20 ns
V
DD
V
SYMBOL TYP. MAX.
TYPICAL EXTRAPOLATION
FORMULA
Propagation delays
An→ O
n
5
t
PHL
100 200 ns 73 ns + (0,55 ns/pF) C
L
HIGH to LOW 10 40 80 ns 29 ns + (0,23 ns/pF) C
L
15 30 60 ns 22 ns + (0,16 ns/pF) C
L
5
t
PLH
90 180 ns 63 ns + (0,55 ns/pF) C
L
LOW to HIGH 10 40 80 ns 29 ns + (0,23 ns/pF) C
L
15 30 60 ns 22 ns + (0,16 ns/pF) C
L
Output transition times 5
t
THL
60 120 ns 10 ns + (1,0 ns/pF) C
L
HIGH to LOW 10 30 60 ns 9 ns + (0,42 ns/pF) C
L
15 20 40 ns 6 ns + (0,28 ns/pF) C
L
5 60 120 ns 10 ns + (1,0 ns/pF) C
L
LOW to HIGH 10 t
TLH
30 60 ns 9 ns + (0,42 ns/pF) C
L
15 20 40 ns 6 ns + (0,28 ns/pF) C
L
V
DD
V
TYPICAL FORMULA FOR P (µW)
Dynamic power 5 350 f
i
+∑(foCL) × V
DD
2
where
dissipation per 10 2 200 f
i
+∑(foCL) × V
DD
2
fi= input freq. (MHz)
package (P) 15 7 350 f
i
+∑(foCL) × V
DD
2
fo= output freq. (MHz)
C
L
= total load cap. (pF)
∑ (f
oCL
) = sum of outputs
V
DD
= supply voltage (V)
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