MM5450/5451 LED Display Driver - Micrel - #1

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MM5450/5451 LED Display Driver SuperSwitcher and Super ßeta PNP are trademarks of Micrel, Inc. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com February 2006 M9999-021606 (408) 955-1690 General Description The MM5450 and MM5451 LED display drivers are monolithic MOS IC’s fabricated in an N-Channel, metalgate process. The technology produces low-threshold, enhancement-mode, and ion-implanted depletion-mode devices. A single pin controls the LED display brightness by setting a reference current through a variable resistor connected to the supply. Applications • Industrial control indicator • Relay driver • Digital clock, thermometer, counter, voltmeter • Instrumentation readouts Features • Continuous brightness control • Serial data input • No load signal requirement • Enable (on MM5450) • Wide power supply operation • TTL compatibility • 34 or 35 outputs, 15mA capability • Alphanumeric capability Ordering Information Part Number Standard Pb-Free Junction Temp. Range Package MM5450BN MM5450YN –40°C to+85°C 40-pin PDIP MM5451BN MM5451YN –40°C to+85°C 40-pin PDIP MM5450BV MM5450YV –40°C to+85°C 44-pin PLCC MM5451BV MM5451YV –40°C to+85°C 44-pin PLCC ____________________________________________________________________________________________________________ Block Diagram 35 OUTPUT BUFFERS 35 LATCHES 35-BIT SHIFT REGISTER LOAD RESET RESET (only available in die form) SERIAL DATA 22 CLOCK 21 DATA ENABLE/OUT 35 (See Note 1) 23 19 20 24 OUT 34 18 OUT 1 1 BRIGHTNESS CONTROL VDD Note 1: Pin 23 is Data Enable in MM5450 Pin 23 is Output 35 in MM5451 Figure 1.