DescriptionThe MC144898B is designed as one kind of flexible light-emitting-diode driver which directly interfaces to individual lamps, 7-segment displays, or various combinations of both. LEOs wired with common cathodes are driven in a multiplexed-by-5 fashion. Communication with an MCUIMPU is established through a synchronous serial port. The MC144898B features data retention plus decode and scan circuitry, thus relieving processor overhead. A single, current-setting resistor is the only ancillary component required. It is compatible with the Motorola SPI and National MICRO-WIRETM serial data ports.
Features of the MC144898B are:(1)Operating Voltage Range of Drive Circuitry: 4.5 to 5.5 V; (2)Operating Junction Temperature Range: -40° to 130°C; (3)Current Sources Controlled by Single Resistor Provide Anode Drive; (4)Low-Resistance FET Switches Provide Direct Common Cathode Interface; (5)Low-Power Mode (Extinguishes the LEDs) and Brightness Controlled via Serial Port; (6)Special Circuitry Minimizes EMI when Display is Driven and Eliminates EMI in Low-Power Mode; (7)Power-On Reset (POR) Blanks the Display on Power-Up, Independent of Supply Ramp Up Time; (8)May Be Used with Double-Heterojunction LEDs for Optimum Efficiency; (9)Chip Complexity: 4300 Elements (FETs, Resistors, Capacitors, etc.).
The absolute maximum ratings of the MC144898B can be summarized as:(1)DC supply voltage: -0.5 to +6.0 V;(2)DC input voltage: -0.5 to VDD+0.5 V;(3)DC output voltage: -0.5 to VDD+0.5 V;(4)DC input current-per pin: +/-15 mA;(5)DC supply current, VDD and Vss pins: +/-350 mA;(6)chip junction temperature: -40 to +130;(7)storage temperature: -65 to +150;(8)lead temperature, 1mm from case for 10 seconds: 260. If you want to know more information such as the electrical characteristics about the MC144898B, please download the datasheet in www.seekic.com or www.chinaicmart.com.
MC144898B Data Sheet
