MC14489B
features data retention plus decode and scan circuitry, thus relieving processor overhead. A single, current-setting resistor is the only ancillary ponent required. A single device can drive anyone of the following: a 5-digit display plus decimals, a 4-112-digit display plus decimals and sign, or 25 lamps. A special technique allows driving 5 112 digits; see Figure 16. 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 patible with the Motorola SPI and National MICRO-WIRETM serial data ports. The chip's patented 8it Grabber TM 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...
