MC14489B Datasheet | Motorola Semiconductor

.Data Sheet.co.kr MOTOROLA SEMICONDUCTOR TECHNICAL DATA M u Iti-Character l ED CMOS The MC144898 is a flexible light-emitting-diode driver which directly interfaces to individual lamps, 7-segment displays, or various binations of both. LEOs wired with mon cathodes are driven in a multiplexed-by-5 fashion. munication with an MCUIMPU is established through a synchronous serial port. The MC 144898 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 .Operating Junction Temperature Range: -40° to 130°C .Current Sources Controlled by Single Resistor Provide Anode Drive .Low-Resistance FET Switches Provide Direct mon 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 plexity: 4300 Elements (FETs, Resistors, Capacitors,...