Document Outline
- DESCRIPTION
- PINNING
- FAMILY DATA, IDD LIMITS category MSI
- FUNCTION TABLE
- AC CHARACTERISTICS
- APPLICATION INFORMATION
DATA SHEET
Product specification
File under Integrated Circuits, IC04
January 1995
INTEGRATED CIRCUITS
HEF4543B
MSI
BCD to 7-segment
latch/decoder/driver
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
January 1995
2
Philips Semiconductors
Product specification
BCD to 7-segment latch/decoder/driver
HEF4543B
MSI
DESCRIPTION
The HEF4543B is a BCD to 7-segment
latch/decoder/driver for liquid crystal and LED displays. It
has four address inputs (D
A
to D
D
), an active HIGH latch
disable input (LD), an active HIGH blanking input (BI), an
active HIGH phase input (PH) and seven buffered
segment outputs (O
a
to O
g
).
The circuit provides the function of a 4-bit storage latch
and an 8-4-2-1 BCD to 7-segment decoder/driver. It can
invert the logic levels of the output combination. The phase
(PH), blanking (BI) and latch disable (LD) inputs are used
to reverse the function table phase, blank the display and
store a BCD code, respectively.
For liquid crystal displays a square-wave is applied to PH
and the electrical common back-plane of the display. The
outputs of the device are directly connected to the
segments of the liquid crystal.
Fig.1 Functional diagram.
HEF4543BP(N):
16-lead DIL; plastic (SOT38-1)
HEF4543BD(F):
16-lead DIL; ceramic (cerdip) ( SOT74)
HEF4543BT(D):
16-lead SO; plastic (SOT109-1)
( ): Package Designator North America
Fig.2 Pinning diagram.
PINNING
D
A
to D
D
address (data) inputs
PH
phase input (active HIGH)
BI
blanking input (active HIGH)
LD
latch disable input (active HIGH)
O
a
to O
g
segment outputs
FAMILY DATA, I
DD
LIMITS category MSI
See Family Specifications
Fig.3 Segment designation.
January 1995
3
Philips Semiconductors
Product specification
BCD to 7-segment latch/decoder/driver
HEF4543B
MSI
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Fig.4 Logic diagram.
January 1995
4
Philips Semiconductors
Product specification
BCD to 7-segment latch/decoder/driver
HEF4543B
MSI
FUNCTION TABLE
Notes
1. H = HIGH state (the more positive voltage)
2. L = LOW state (the less positive voltage)
3. X = state is immaterial
4. For liquid crystal displays, apply a square-wave to PH.
For common cathode LED displays, select PH = LOW.
For common anode LED displays, select PH = HIGH.
5. Depends upon the BCD-code previously applied when LD = HIGH.
INPUTS
OUTPUTS
LD
BI
PH
(4)
D
D
D
C
D
B
D
A
O
a
O
b
O
c
O
d
O
e
O
f
O
g
DISPLAY
X
H
L
X
X
X
X
L
L
L
L
L
L
L
blank
H
L
L
L
L
L
L
H
H
H
H
H
H
L
0
H
L
L
L
L
L
H
L
H
H
L
L
L
L
1
H
L
L
L
L
H
L
H
H
L
H
H
L
H
2
H
L
L
L
L
H
H
H
H
H
H
L
L
H
3
H
L
L
L
H
L
L
L
H
H
L
L
H
H
4
H
L
L
L
H
L
H
H
L
H
H
L
H
H
5
H
L
L
L
H
H
L
H
L
H
H
H
H
H
6
H
L
L
L
H
H
H
H
H
H
L
L
L
L
7
H
L
L
H
L
L
L
H
H
H
H
H
H
H
8
H
L
L
H
L
L
H
H
H
H
H
L
H
H
9
H
L
L
H
L
H
L
L
L
L
L
L
L
L
blank
H
L
L
H
L
H
H
L
L
L
L
L
L
L
blank
H
L
L
H
H
L
L
L
L
L
L
L
L
L
blank
H
L
L
H
H
L
H
L
L
L
L
L
L
L
blank
H
L
L
H
H
H
L
L
L
L
L
L
L
L
blank
H
L
L
H
H
H
H
L
L
L
L
L
L
L
blank
L
L
L
X
X
X
X
(5)
(5)
as above
H
as above
inverse of above
as above
Fig.5 Display.
January 1995
5
Philips Semiconductors
Product specification
BCD to 7-segment latch/decoder/driver
HEF4543B
MSI
AC CHARACTERISTICS
V
SS
= 0 V; T
amb
= 25
C; C
L
= 50 pF; input transition times
20 ns
V
DD
V
SYMBOL
MIN.
TYP.
MAX.
TYPICAL EXTRAPOLATION
FORMULA
Propagation delays
D
n
O
n
5
180
360
ns
153 ns
+
(0,55 ns/pF) C
L
HIGH to LOW
10
t
PHL
75
150
ns
64 ns
+
(0,23 ns/pF) C
L
15
55
110
ns
47 ns
+
(0,16 ns/pF) C
L
5
180
360
ns
153 ns
+
(0,55 ns/pF) C
L
LOW to HIGH
10
t
PLH
75
150
ns
64 ns
+
(0,23 ns/pF) C
L
15
55
110
ns
47 ns
+
(0,16 ns/pF) C
L
LD
O
n
5
170
340
ns
143 ns
+
(0,55 ns/pF) C
L
HIGH to LOW
10
t
PHL
80
160
ns
69 ns
+
(0,23 ns/pF) C
L
15
60
120
ns
52 ns
+
(0,16 ns/pF) C
L
5
190
380
ns
163 ns
+
(0,55 ns/pF) C
L
LOW to HIGH
10
t
PLH
80
160
ns
69 ns
+
(0,23 ns/pF) C
L
15
60
120
ns
52 ns
+
(0,16 ns/pF) C
L
BI
O
n
5
145
290
ns
118 ns
+
(0,55 ns/pF) C
L
HIGH to LOW
10
t
PHL
65
130
ns
54 ns
+
(0,23 ns/pF) C
L
15
45
90
ns
37 ns
+
(0,16 ns/pF) C
L
5
125
250
ns
98 ns
+
(0,55 ns/pF) C
L
LOW to HIGH
10
t
PLH
55
110
ns
54 ns
+
(0,23 ns/pF) C
L
15
40
80
ns
32 ns
+
(0,16 ns/pF) C
L
Output transition times
5
60
120
ns
10 ns
+
(1,0 ns/pF) C
L
HIGH to LOW
10
t
THL
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
Minimum LD
5
60
30
ns
pulse width; HIGH
10
t
WLDH
30
15
ns
15
20
10
ns
Set-up time
5
40
20
ns
D
n
LD
10
t
su
20
5
ns
15
15
0
ns
Hold time
5
0
-
15
ns
D
n
LD
10
t
hold
15
0
ns
15
20
5
ns
January 1995
6
Philips Semiconductors
Product specification
BCD to 7-segment latch/decoder/driver
HEF4543B
MSI
APPLICATION INFORMATION
Some examples of applications for the HEF4543B are:
Driving LCD displays.
Driving LED displays.
Driving fluorescent displays.
Driving incandescent displays.
Driving gas discharge displays.
V
DD
V
TYPICAL FORMULA FOR P (
W)
Dynamic power
5
2 200 f
i
+
(f
o
C
L
)
V
DD
2
where
dissipation per
10
10 400 f
i
+
(f
o
C
L
)
V
DD
2
f
i
= input freq. (MHz)
package (P)
15
33 000 f
i
+
(f
o
C
L
)
V
DD
2
f
o
= output freq. (MHz)
C
L
= load capacitance (pF)
(f
o
C
L
) = sum of outputs
V
DD
= supply voltage (V)
Fig.6 Connection to common cathode LED display readout.
January 1995
7
Philips Semiconductors
Product specification
BCD to 7-segment latch/decoder/driver
HEF4543B
MSI
Note to Figs 6 and 7: bipolar transistors may be added for gain where V
DD
10 V or I
out
10 mA.
Fig.7 Connection to common anode LED display readout.
Fig.8 Connection to liquid crystal (LCD) display readout.
January 1995
8
Philips Semiconductors
Product specification
BCD to 7-segment latch/decoder/driver
HEF4543B
MSI
Fig.9 Connection to incandescent display readout.
Fig.10 Connection to gas discharge display readout.
Fig.11 Connection to fluorescent display readout.
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