General Description

The CD4511BC BCD-to-seven segment latch/decoder/driver is constructed with complementary MOS (CMOS) enhancement mode devices and NPN bipolar output drivers in a single monolithic structure. The circuit provides the functions of a 4-bit storage latch, an 8421 BCD-to-seven segment decoder, and an output drive capability. Lamp test (LT), blanking (BI), and latch enable (LE) inputs are used to test the display, to turn-off or pulse modulate the brightness of the display, and to store a BCD code, respectively. It can be used with seven-segment light emitting diodes (LED), incandescent, fluorescent, gas discharge, or liquid crystal readouts either directly or indirectly.

Features

■ Low logic circuit power dissipation

■ High current sourcing outputs (up to 25 mA)

■ Latch storage of code

■ Blanking input

■ Lamp test provision

■ Readout blanking on all illegal input combinations

■ Lamp intensity modulation capability

■ Time share (multiplexing) facility

■ Equivalent to Motorola MC14511