MM54HC4511/MM74HC4511BCD-to-7 Segment Latch/Decoder/DriverGeneral Des criptionThis high speed latch/decoder/driver utilizes advanced silicon-gate CMOS technology. It has the high noise immunityand low power consumption of standard CMOS integratedcircuits, as well as the ability to drive 10 LS-TTL loads. Thecircuit provides the functions of a 4-bit storage latch, an8421 BCD-to-seven segment decoder, and an output drivecapability. Lamp test (LT), blanking (Bl), and latch enable(LE) inputs are used to test the display, to turn-off or pulsemodulate the brightness of the display, and to store a BCDcode, respectively. It can be used with seven-segment lightemitting diodes (LED), incandescent, fluorescent, gas discharge,or liquid crystal readouts either directly or indirectly.Applications include instrument (e.g., counter, DVM, etc.)display driver, computer/calculator display driver, cockpitdisplay driver, and various clock, watch, and timer uses.The 54HC/74HC logic family is speed, function, and pinoutcompatible with the standard 54LS/74LS logic family. Allinputs are protected from damage due to static discharge byinternal diode clamps to VCC and ground.FeaturesY Latch storage of input dataY Blanking inputY Lamp test inputY Low power consumption characteristics of CMOSdevicesY Wide operating voltage range: 2 to 6 voltsY Low input current: 1 mA maximumY Low quiescent current: 80 mA maximum over full temperaturerange (74 Serie
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