MC14543B Datasheet, PDF (1/7 Pages) ON Semiconductor – BCD-to-Seven Segment Latch/Decoder/Driver for Liquid Crystals

MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
BCD-to-Seven Segment
Latch/Decoder/Driver for
Liquid Crystals
The MC14543B BCD–to–seven segment latch/decoder/driver is designed
for use with liquid crystal readouts, and is constructed with complementary
MOS (CMOS) enhancement mode devices. The circuit provides the
functions of a 4–bit storage latch and an 8421 BCD–to–seven segment
decoder and driver. The device has the capability to invert the logic levels of
the output combination. The phase (Ph), blanking (BI), and latch disable (LD)
inputs are used to reverse the truth table phase, blank the display, and store
a BCD code, respectively. For liquid crystal (LC) readouts, a square wave is
applied to the Ph input of the circuit and the electrically common backplane
of the display. The outputs of the circuit are connected directly to the
segments of the LC readout. For other types of readouts, such as
light–emitting diode (LED), incandescent, gas discharge, and fluorescent
readouts, connection diagrams are given on this data sheet.
Applications include instrument (e.g., counter, DVM etc.) display driver,
computer/calculator display driver, cockpit display driver, and various clock,
watch, and timer uses.
• Latch Storage of Code
• Blanking Input
• Readout Blanking on All Illegal Input Combinations
• Direct LED (Common Anode or Cathode) Driving Capability
• Supply Voltage Range = 3.0 V to 18 V
• Capable of Driving Two Low–power TTL Loads, One Low–power
Schottky TTL Load or Two HTL Loads Over the Rated Temperature
Range
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ _{• Pin–for–Pin Replacement for CD4056A (with Pin 7 Tied to VSS).}
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ • Chip Complexity: 207 FETs or 52 Equivalent Gates
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ _{MAXIMUM RATINGS* (Voltages referenced to VSS)}
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Rating
Symbol
Value
Unit
DC Supply Voltage
VDD
– 0.5 to + 18
V
Input Voltage, All Inputs
Vin – 0.5 to VDD + 0.5 V
DC Input Current per Pin
Iin
± 10
mA
Operating Temperature Range
TA
– 55 to + 125
_C
Power Dissipation, per Package†
Storage Temperature Range
PD
500
mW
Tstg
– 65 to + 150
_C
Maximum Continuous Output Drive
IOHmax
10
mA
Current (Source or Sink) per Output
IOLmax
Maximum Continuous Output Power*
POHmax
70
mW
(Source or Sink) per Output
POLmax
* POHmax = IOH (VOH – VDD) and POLmax = IOL (VOL – VSS)
* Maximum Ratings are those values beyond which damage to the device may occur.
†Temperature Derating:
Plastic “P and D/DW” Packages: – 7.0 mW/_C From 65_C To 125_C
Ceramic “L” Packages: – 12 mW/_C From 100_C To 125_C
MC14543B
L SUFFIX
CERAMIC
CASE 620
P SUFFIX
PLASTIC
CASE 648
D SUFFIX
SOIC
CASE 751B
ORDERING INFORMATION
MC14XXXBCP
MC14XXXBCL
MC14XXXBD
Plastic
Ceramic
SOIC
TA = – 55° to 125°C for all packages.
TRUTH TABLE
Inputs
Outputs
LD BI Ph* D C B A a b c d e f g Display
X 1 0 X X X X 0 0 0 0 0 0 0 Blank
1 0 0 0 0 001111110
0
1 0 0 0 0 010110000
1
1 0 0 0 0 101101101
2
1 0 0 0 0 111111001
3
1 0 0 0 1 000110011
4
1 0 0 0 1 011011011
5
1 0 0 0 1 101011111
6
1 0 0 0 1 111110000
7
1 0 0 1 0 001111111
1 0 0 1 0 011111011
1 0 0 1 0 100000000
1 0 0 1 0 110000000
8
9
Blank
Blank
1 0 0 1 1 000000000
1 0 0 1 1 010000000
1 0 0 1 1 100000000
1 0 0 1 1 110000000
Blank
Blank
Blank
Blank
0 0 0 X X XX
**
**
†††
†
Inverse of Output
Combinations
Above
Display
as above
X = Don’t care
† = Above Combinations
* = For liquid crystal readouts, apply a square wave to Ph
For common cathode LED readouts, select Ph = 0
For common anode LED readouts, select Ph = 1
** = Depends upon the BCD code previously applied when
LD = 1
REV 3
1/94
©MMOotoTrOolaR, IOncL. A199C5MOS LOGIC DATA
MC14543B
1