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MC145453P ,LCD Driver with Serial InterfaceMAXIMUM RATINGS* (Voltages Referenced to VSS)Symbol Parameter Value UnitVDD DC Supply Voltage - 0.5 ..
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MC14544BCP
BCD-to-Seven Segment Latch/Decoder/Driver for Liquid Crystals
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CMOS MSI (Low–Power Complementary MOS)The MC14544B 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. The Ripple Blanking Input (RBI) and the Ripple
Blanking Output (RBO) can be used to suppress either leading or trailing
zeroes.
For other types of readouts, such as light–emitting diode (LED),
incandescent, gas discharge, and fluorescent readouts, connection dia-
grams 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 Capability for Suppression of Non–significant zero Capable of Driving Two Low–power TTL Loads, One Low–power
Schottky TTL Load or Two HTL Loads Over the Rated Temperature
Range
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ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ 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 125C
SEMICONDUCTOR TECHNICAL DATA
