The MC14511B 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.
●Applications include instrument (e.g., counter, DVM, etc.) display driver, computer/calculator display driver, cockpit display driver, and various clock, watch, and timer uses.
●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
●• 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
●• Chip Complexity: 216 FETs or 54 Equivalent Gates
●• Triple Diode Protection on all Inputs
●• Pb−Free Packages are Available
