DATA SH EET
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 (DAto DD), an active HIGH latch
disable input (LD), an active HIGH blanking input (BI), an
active HIGH phase input (PH) and seven buffered
segment outputs (Oato Og).
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
DAto DDaddress (data) inputs
PH phase input (active HIGH)
BI blanking input (active HIGH)
LD latch disable input (active HIGH)
Oato Ogsegment outputs
FAMILY DATA, IDD 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) DDDCDBDAOaObOcOdOeOfOgDISPLAY
X H L X X X X L L L L L L L blank
HLL L L L LHH HHHHL 0
HLLLLLHLHHLLLL 1
HLLLLHLHHLHHLH 2
HL L L L H H H H H H L LH 3
HLLLHLLLHHLLHH 4
HLLLHLHHLHHLHH 5
HLL LHHLH L HHHHH 6
HLLLHHHHHHLLLL 7
HLL HL L LHH HHHHH 8
HL L H L L H H H H H L HH 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
LL 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
VSS = 0 V; Tamb =25°C; CL= 50 pF; input transition times ≤20 ns
VDD
VSYMBOL MIN. TYP. MAX. TYPICAL EXTRAPOLATION
FORMULA
Propagation delays
Dn→On5 180 360 ns 153 ns +(0,55 ns/pF) CL
HIGH to LOW 10 tPHL 75 150 ns 64 ns +(0,23 ns/pF) CL
15 55 110 ns 47 ns +(0,16 ns/pF) CL
5 180 360 ns 153 ns +(0,55 ns/pF) CL
LOW to HIGH 10 tPLH 75 150 ns 64 ns +(0,23 ns/pF) CL
15 55 110 ns 47 ns +(0,16 ns/pF) CL
LD →On5 170 340 ns 143 ns +(0,55 ns/pF) CL
HIGH to LOW 10 tPHL 80 160 ns 69 ns +(0,23 ns/pF) CL
15 60 120 ns 52 ns +(0,16 ns/pF) CL
5 190 380 ns 163 ns +(0,55 ns/pF) CL
LOW to HIGH 10 tPLH 80 160 ns 69 ns +(0,23 ns/pF) CL
15 60 120 ns 52 ns +(0,16 ns/pF) CL
BI →On5 145 290 ns 118 ns +(0,55 ns/pF) CL
HIGH to LOW 10 tPHL 65 130 ns 54 ns +(0,23 ns/pF) CL
15 45 90 ns 37 ns +(0,16 ns/pF) CL
5 125 250 ns 98 ns +(0,55 ns/pF) CL
LOW to HIGH 10 tPLH 55 110 ns 54 ns +(0,23 ns/pF) CL
15 40 80 ns 32 ns +(0,16 ns/pF) CL
Output transition times 5 60 120 ns 10 ns +(1,0 ns/pF) CL
HIGH to LOW 10 tTHL 30 60 ns 9 ns +(0,42 ns/pF) CL
15 20 40 ns 6 ns +(0,28 ns/pF) CL
5 60 120 ns 10 ns +(1,0 ns/pF) CL
LOW to HIGH 10 tTLH 30 60 ns 9 ns +(0,42 ns/pF) CL
15 20 40 ns 6 ns +(0,28 ns/pF) CL
Minimum LD 5 60 30 ns
pulse width; HIGH 10 tWLDH 30 15 ns
15 20 10 ns
Set-up time 5 40 20 ns
Dn→LD 10 tsu 20 5 ns
15 15 0 ns
Hold time 5 0 −15 ns
Dn→LD 10 thold 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.
VDD
VTYPICAL FORMULA FOR P (µW)
Dynamic power 5 2 200 fi+∑(foCL)×VDD2where
dissipation per 10 10 400 fi+∑(foCL)×VDD2fi= input freq. (MHz)
package (P) 15 33 000 fi+∑(foCL)×VDD2fo= output freq. (MHz)
CL= load capacitance (pF)
∑(foCL) = sum of outputs
VDD = 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 VDD ≤10 V or Iout ≥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.
