Details, datasheet, quote on part number: MC14544BCP
CategoryTiming Circuits
DescriptionBcd-to-seven Segment Latch/decoder/driver For Liquid Crystals
CompanyMotorola Semiconductor Products
DatasheetDownload MC14544BCP datasheet
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Features, Applications

The MC14544B BCD­to­seven 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 a 4­bit storage latch and an 8421 BCD­to­seven 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 light­emitting 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 18 V Capability for Suppression of Non­significant zero Capable of Driving Two Low­power TTL Loads, One Low­power Schottky TTL Load or Two HTL Loads Over the Rated Temperature Range

Rating Symbol VDD Vin Iin TA PD Tstg IOHmax IOLmax POHmax POLmax Value

DC Supply Voltage Unit V mAdc 0.5 to Input Voltage, All Inputs DC Input Current per Pin Operating Temperature Range Power Dissipation, per Package Storage Temperature Range Maximum Continuous Output Drive Current (Source or Sink) per Output Maximum Continuous Output Power* (Source or Sink) per Output 0.5 to VDD + 0.5

* 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 To 125_C Ceramic "L" Packages: ­ 12 mW/_C From To 125_C

This device contains protection circuitry to guard against damage due to high static voltages or electric fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high­impedance circuit. For proper operation, Vin and Vout should be constrained to the range VSS (Vin or Vout) VDD. Unused inputs must always be tied to an appropriate logic voltage level (e.g., either VSS or VDD). Unused outputs must be left open.


#Noise immunity specified for worst­case input combination. Noise Margin for both "1" and "0" level 1.0 V min @ VDD 2.0 V min @ VDD 2.5 V min @ VDD V To calculate total supply current at loads other than 50 pF: IT(CL) = IT(50 pF) x 10­3 (CL ­ 50) VDDf where: in µA (per package), CL in pF, VDD in V, and f in kHz is input frequency. * The formulas given are for the typical characteristics only at 25_C.

Latch Disable Pulse Width (Strobing Data)


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