MC14489B
Overview
- A configuration register allows the drive capability to be partitioned off to suit many additional applications. The on-chip decoder outputs 7-segment-format numerals O to 9, hexadecimal characters A to F, plus 151etters and symbols. The MC144898 is compatible with the Motorola SPI and National MICRO-WIRETM serial data ports. The chip's patented 8itGrabberTM registers augment the serial interface by allowing random access without steering or address bits. A 24-bit transfer updates the display register. Changing the configuration register requires an 8-bit transfer. .Operating Voltage Range of Drive Circuitry: 4.5 to 5.5 V .Operating Junction Temperature Range: -40° to 130°C .Current Sources Controlled by Single Resistor Provide Anode Drive .Low-Resistance FET Switches Provide Direct Common Cathode Interface .Low-Power Mode (Extinguishes the LEDs) and Brightness Controlled via Serial Port .Special Circuitry Minimizes EMI when Display is Driven and Eliminates EMI in Low-Power Mode .Power-On Reset (POR) Blanks the Display on Power-Up, Independent of Supply Ramp Up Time .May Be Used with Double-Heterojunction LEDs for Optimum Efficiency .Chip Complexity: 4300 Elements (FETs, Resistors, Capacitors,
