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
HEF4532B
MSI
8-input priority encoder
Product specification
File under Integrated Circuits, IC04
January 1995
Page 2
Philips Semiconductors Product specification
8-input priority encoder
DESCRIPTION
The HEF4532B is an 8-input priority encoder with eight
active HIGH priority inputs (I0to I7), three active HIGH
outputs (O0to O2), an active HIGH enable input (Ein), an
active HIGH enable output (E
group select output (GS).
Data is accepted on inputs I0to I7. The binary code
) and an active HIGH
out
HEF4532B
MSI
corresponding to the highest priority input (I
HIGH, is generated on O0to O2if Einis HIGH. Input I7is
assigned the highest priority.
GS is HIGH when one or more priority inputs and Einare
HIGH. E
is HIGH when I0to I7are LOW and Einis HIGH.
out
Ein, when LOW, forces all outputs (O0to O2, GS, E
LOW.
to I7) which is
0
out
)
Fig.1 Functional diagram.
HEF4532BP(N): 16-lead DIL; plastic
(SOT38-1)
HEF4532BD(F): 16-lead DIL; ceramic (cerdip)
(SOT74)
HEF4532BT(D): 16-lead SO; plastic
(SOT109-1)
( ): Package Designator North America
PINNING
to I
I
0
7
E
in
E
out
priority inputs
enable input
enable output
GS group select output
O
0
to O
2
outputs
FAMILY DATA, IDDLIMITS category MSI
See Family Specifications
Fig.2 Pinning diagram.
January 1995 2
Page 3
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January 1995 3
Philips Semiconductors Product specification
8-input priority encoder
Fig.3 Logic diagram.
HEF4532B
MSI
Page 4
Philips Semiconductors Product specification
8-input priority encoder
HEF4532B
MSI
TRUTH TABLE
INPUTS OUTPUTS
E
in
L XXXXXXXXLLLL L
H LLLLLLLLLLLL H
H HXXXXXXXHHHH L
H LHXXXXXXHHHL L
H LLHXXXXXHHLH L
H LLLHXXXXHHLL L
H LLLLHXXXHLHH L
H LLLLLHXXHLHL L
H LLLLLLHXHLLH L
H LLLLLLLHHLLL L
Notes
1. H = HIGH state (the more positive voltage)
2. L = LOW state (the less positive voltage)
3. X = state is immaterial
I
7
I
6
I
5
I
4
I
3
I
2
I
1
I
0
GS O
O
2
O
1
0
E
out
LOGIC EQUATIONS
O
=Ein⋅ (I4+ I5+ I6+ I7)
2
=Ein⋅ (I2⋅ I4⋅ I5+ I3⋅ I4⋅ I5+ I6+ I7)
O
1
O
=Ein⋅ (I1⋅ I2⋅ I4⋅ I6+ I3⋅ I4⋅ I6+ I5⋅ I6+ I7)
0
E
=Ein⋅ I0⋅ I1⋅ I2⋅ I3⋅ I4⋅ I5⋅ I6⋅ I
out
7
GS = Ein⋅ (I0+ I1+ I2+ I3+ I4+ I5+ I6+ I7)
AC CHARACTERISTICS
V
SS
= 0 V; T
=25°C; input transition times ≤ 20 ns
amb
V
DD
V
TYPICAL FORMULA FOR P (µW)
Dynamic power 5 1 620 f
dissipation per 10 6 600 f
package (P) 15 15 970 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
= load capacitance (pF)
L
) = sum of outputs
∑ (f
oCL
= supply voltage (V)
V
DD
January 1995 4
Page 5
Philips Semiconductors Product specification
8-input priority encoder
HEF4532B
AC CHARACTERISTICS
V
= 0 V; T
SS
Propagation delays
Ein→ E
HIGH to LOW 10 t
LOW to HIGH 10 t
Ein→ GS 5 85 170 ns 58 ns + (0,55 ns/pF) C
HIGH to LOW 10 t
LOW to HIGH 10 t
Ein→ O
HIGH to LOW 10 t
LOW to HIGH 10 t
In→ O
HIGH to LOW 10 t
LOW to HIGH 10 t
In→ GS 5 115 230 ns 88 ns + (0,55 ns/pF) C
HIGH to LOW 10 t
LOW to HIGH 10 t
Output transition 5 60 120 ns 10 ns + (1,0 ns/pF) C
times 10 t
HIGH to LOW 15 20 40 ns 6 ns + (0,28 ns/pF) C
LOW to HIGH 10 t
=25°C; CL= 50 pF; input transition times ≤ 20 ns; see also waveforms Fig.4
amb
V
DD
SYMBOL MIN. TYP. MAX.
V
out
5 95 190 ns 68 ns + (0,55 ns/pF) C
PHL
45 90 ns 34 ns + (0,23 ns/pF) C
15 35 70 ns 27 ns + (0,16 ns/pF) C
5 80 160 ns 53 ns + (0,55 ns/pF) C
PLH
35 70 ns 24 ns + (0,23 ns/pF) C
15 30 60 ns 22 ns + (0,16 ns/pF) C
PHL
45 90 ns 34 ns + (0,23 ns/pF) C
15 35 70 ns 27 ns + (0,16 ns/pF) C
5 80 160 ns 53 ns + (0,55 ns/pF) C
PLH
40 80 ns 29 ns + (0,23 ns/pF) C
15 30 60 ns 22 ns + (0,16 ns/pF) C
n
5 80 160 ns 53 ns + (0,55 ns/pF) C
PHL
40 80 ns 29 ns + (0,23 ns/pF) C
15 30 60 ns 22 ns + (0,16 ns/pF) C
5 85 170 ns 58 ns + (0,55 ns/pF) C
PLH
40 80 ns 29 ns + (0,23 ns/pF) C
15 30 60 ns 22 ns + (0,16 ns/pF) C
n
5 115 230 ns 88 ns + (0,55 ns/pF) C
PHL
50 100 ns 39 ns + (0,23 ns/pF) C
15 35 70 ns 27 ns + (0,16 ns/pF) C
5 115 230 ns 88 ns + (0,55 ns/pF) C
PLH
50 100 ns 39 ns + (0,23 ns/pF) C
15 35 70 ns 27 ns + (0,16 ns/pF) C
PHL
50 100 ns 39 ns + (0,23 ns/pF) C
15 40 80 ns 32 ns + (0,16 ns/pF) C
5 115 230 ns 88 ns + (0,55 ns/pF) C
PLH
50 100 ns 39 ns + (0,23 ns/pF) C
15 40 80 ns 32 ns + (0,16 ns/pF) C
THL
30 60 ns 9 ns + (0,42 ns/pF) C
5 60 120 ns 10 ns + (1,0 ns/pF) C
TLH
30 60 ns 9 ns + (0,42 ns/pF) C
15 20 40 ns 6 ns + (0,28 ns/pF) C
TYPICAL EXTRAPOLATION
FORMULA
MSI
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
January 1995 5
Page 6
Philips Semiconductors Product specification
8-input priority encoder
HEF4532B
MSI
Fig.4 Waveforms showing propagation delays from inputs to outputs.
January 1995 6
Page 7
Philips Semiconductors Product specification
8-input priority encoder
APPLICATION INFORMATION
Some examples of applications for the HEF4532B are:
• Priority encoder
• Keyboard encoder
HEF4532B
MSI
Fig.5 16-level priority encoder.
January 1995 7
Page 8
Philips Semiconductors Product specification
8-input priority encoder
HEF4532B
MSI
Fig.6 0-to-9 keyboard encoder.
TRUTH TABLE (for Fig.6)
INPUTS OUTPUTS
9 876543210GSO’
H XXXXXXXXXLHLLH
L HXXXXXXXXLHLLL
L LHXXXXXXXHLHHH
L LLHXXXXXXHLHHL
L LLLHXXXXXHLHLH
L LLLLHXXXXHLHLL
L LLLLLHXXXHLLHH
L LLLLLLHXXHLLHL
L LLLLLLLHXHLLLH
L LLLLLLLLHHLLLL
Notes
1. H = HIGH state (the more positive voltage)
2. L = LOW state (the less positive voltage)
3. X = state is immaterial
3O’2
O’
1
O’
0
January 1995 8
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