Page 1
DATA SH EET
Product specification
File under Integrated Circuits, IC04
January 1995
INTEGRATED CIRCUITS
HEF4532B
MSI
8-input priority encoder
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
8-input priority encoder
HEF4532B
MSI
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
out
) and an active HIGH
group select output (GS).
Data is accepted on inputs I0to I7. The binary code
corresponding to the highest priority input (I
0
to I7) which is
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
out
is HIGH when I0to I7are LOW and Einis HIGH.
Ein, when LOW, forces all outputs (O0to O2, GS, E
out
)
LOW.
Fig.1 Functional diagram.
Fig.2 Pinning diagram.
PINNING
FAMILY DATA, IDDLIMITS category MSI
See Family Specifications
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
I
0
to I
7
priority inputs
E
in
enable input
E
out
enable output
GS group select output
O
0
to O
2
outputs
Page 3
January 1995 3
Philips Semiconductors Product specification
8-input priority encoder
HEF4532B
MSI
This text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here in
_white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here inThis text is here in
white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader. white to force landscape pages to be ...
Fig.3 Logic diagram.
Page 4
January 1995 4
Philips Semiconductors Product specification
8-input priority encoder
HEF4532B
MSI
TRUTH TABLE
Notes
1. H = HIGH state (the more positive voltage)
2. L = LOW state (the less positive voltage)
3. X = state is immaterial
LOGIC EQUATIONS
AC CHARACTERISTICS
V
SS
= 0 V; T
amb
=25°C; input transition times ≤ 20 ns
INPUTS OUTPUTS
E
in
I
7
I
6
I
5
I
4
I
3
I
2
I
1
I
0
GS O
2
O
1
O
0
E
out
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
O
2
=Ein⋅ (I4+ I5+ I6+ I7)
O
1
=Ein⋅ (I2⋅ I4⋅ I5+ I3⋅ I4⋅ I5+ I6+ I7)
O
0
=Ein⋅ (I1⋅ I2⋅ I4⋅ I6+ I3⋅ I4⋅ I6+ I5⋅ I6+ I7)
E
out
=Ein⋅ I0⋅ I1⋅ I2⋅ I3⋅ I4⋅ I5⋅ I6⋅ I
7
GS = Ein⋅ (I0+ I1+ I2+ I3+ I4+ I5+ I6+ I7)
V
DD
V
TYPICAL FORMULA FOR P (µW)
Dynamic power 5 1 620 f
i
+∑(foCL) × V
DD
2
where
dissipation per 10 6 600 f
i
+∑(foCL) × V
DD
2
fi= input freq. (MHz)
package (P) 15 15 970 f
i
+∑(foCL) × V
DD
2
fo= output freq. (MHz)
C
L
= load capacitance (pF)
∑ (f
oCL
) = sum of outputs
V
DD
= supply voltage (V)
Page 5
January 1995 5
Philips Semiconductors Product specification
8-input priority encoder
HEF4532B
MSI
AC CHARACTERISTICS
V
SS
= 0 V; T
amb
=25°C; CL= 50 pF; input transition times ≤ 20 ns; see also waveforms Fig.4
V
DD
V
SYMBOL MIN. TYP. MAX.
TYPICAL EXTRAPOLATION
FORMULA
Propagation delays
Ein→ E
out
5 95 190 ns 68 ns + (0,55 ns/pF) C
L
HIGH to LOW 10 t
PHL
45 90 ns 34 ns + (0,23 ns/pF) C
L
15 35 70 ns 27 ns + (0,16 ns/pF) C
L
5 80 160 ns 53 ns + (0,55 ns/pF) C
L
LOW to HIGH 10 t
PLH
35 70 ns 24 ns + (0,23 ns/pF) C
L
15 30 60 ns 22 ns + (0,16 ns/pF) C
L
Ein→ GS 5 85 170 ns 58 ns + (0,55 ns/pF) C
L
HIGH to LOW 10 t
PHL
45 90 ns 34 ns + (0,23 ns/pF) C
L
15 35 70 ns 27 ns + (0,16 ns/pF) C
L
5 80 160 ns 53 ns + (0,55 ns/pF) C
L
LOW to HIGH 10 t
PLH
40 80 ns 29 ns + (0,23 ns/pF) C
L
15 30 60 ns 22 ns + (0,16 ns/pF) C
L
Ein→ O
n
5 80 160 ns 53 ns + (0,55 ns/pF) C
L
HIGH to LOW 10 t
PHL
40 80 ns 29 ns + (0,23 ns/pF) C
L
15 30 60 ns 22 ns + (0,16 ns/pF) C
L
5 85 170 ns 58 ns + (0,55 ns/pF) C
L
LOW to HIGH 10 t
PLH
40 80 ns 29 ns + (0,23 ns/pF) C
L
15 30 60 ns 22 ns + (0,16 ns/pF) C
L
In→ O
n
5 115 230 ns 88 ns + (0,55 ns/pF) C
L
HIGH to LOW 10 t
PHL
50 100 ns 39 ns + (0,23 ns/pF) C
L
15 35 70 ns 27 ns + (0,16 ns/pF) C
L
5 115 230 ns 88 ns + (0,55 ns/pF) C
L
LOW to HIGH 10 t
PLH
50 100 ns 39 ns + (0,23 ns/pF) C
L
15 35 70 ns 27 ns + (0,16 ns/pF) C
L
In→ GS 5 115 230 ns 88 ns + (0,55 ns/pF) C
L
HIGH to LOW 10 t
PHL
50 100 ns 39 ns + (0,23 ns/pF) C
L
15 40 80 ns 32 ns + (0,16 ns/pF) C
L
5 115 230 ns 88 ns + (0,55 ns/pF) C
L
LOW to HIGH 10 t
PLH
50 100 ns 39 ns + (0,23 ns/pF) C
L
15 40 80 ns 32 ns + (0,16 ns/pF) C
L
Output transition 5 60 120 ns 10 ns + (1,0 ns/pF) C
L
times 10 t
THL
30 60 ns 9 ns + (0,42 ns/pF) C
L
HIGH to LOW 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
Page 6
January 1995 6
Philips Semiconductors Product specification
8-input priority encoder
HEF4532B
MSI
Fig.4 Waveforms showing propagation delays from inputs to outputs.
Page 7
January 1995 7
Philips Semiconductors Product specification
8-input priority encoder
HEF4532B
MSI
APPLICATION INFORMATION
Some examples of applications for the HEF4532B are:
• Priority encoder
• Keyboard encoder
Fig.5 16-level priority encoder.
Page 8
January 1995 8
Philips Semiconductors Product specification
8-input priority encoder
HEF4532B
MSI
TRUTH TABLE (for Fig.6)
Notes
1. H = HIGH state (the more positive voltage)
2. L = LOW state (the less positive voltage)
3. X = state is immaterial
INPUTS OUTPUTS
9 876543210GSO’
3O’2
O’
1
O’
0
H XXXXXXXXXLHLLH
L HXXXXXXXXLHLLL
L LHXXXXXXXHLHHH
L LLHXXXXXXHLHHL
L LLLHXXXXXHLHLH
L LLLLHXXXXHLHLL
L LLLLLHXXXHLLHH
L LLLLLLHXXHLLHL
L LLLLLLLHXHLLLH
L LLLLLLLLHHLLLL
Fig.6 0-to-9 keyboard encoder.
Loading...