DM9368 Datasheet | Fairchild Semiconductor

Description The DM9368 is a 7-segment decoder driver incorporating input latches and constant current output circuits to drive mon cathode type LED displays directly. Ordering Code: Order Number DM9638N Package Number N16E Package Description 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Connection Diagram Logic Symbol VCC = Pin 16 GND = PIN 8 Pin Descriptions Pin Name A0- A3 RBO RBI a- g LE Description Address (Data) Inputs Ripple Blanking Output (Active LOW) Ripple Blanking Input (Active LOW) Segment Drivers-Outputs Latch Enable Input (Active LOW) © 2000 Fairchild Semiconductor Corporation DS009796 .fairchildsemi. Truth Table - The RBI will blank the display only if a binary zero is stored in the latches. - The RBO used as an input overrides all other input conditions. H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Functional Description The DM9368 is a 7-segment decoder driver designed to drive 7-segment mon cathode LED displays. The DM9368 drives any mon cathode LED display rated at a nominal 20 m A at 1.7V per segment without need for current limiting resistors. This device accepts a 4-bit binary code and produces output drive to the appropriate segments of the 7-segment display. It has a hexadecimal decode format which produces numeric codes “0” thru “9” and alpha codes “A” through “F” using upper and lower case fonts. Latches on the four data inputs are controlled by an active LOW latch enable LE. When the LE is LOW, the state of the outputs is determined by the input data. When the LE goes HIGH, the last data present at the inputs is stored in the latches and the outputs remain stable. The LE pulse width necessary to accept and store data is typically 30 ns which allows data to be strobed into the DM9368 at normal TTL speeds. This feature means that data can be routed directly from high speed counters and frequency dividers into the display without slowing down the system clock or providing intermediate...