MM5484 16-Segment LED Display Driver Y General Description Y The MM5484 is a low threshold N-channel metal gate circuit using low threshold enhancement and ion implanted depletion devices. The MM5484 is available in a 22-pin molded package and is capable of driving 16 LED segments. The MM5484 is designed to drive common anode separate cathode LED displays. Y Y Y Applications Y Features Y Y Y Y Serial data input Wide power supply operation 16 output, 15 mA sink capability MM5484 is cascadeable TTL compatibility No load signal required Non multiplex display 2(/2 digit capabilityÐMM5484 Y Y COPSTM or microprocessor displays Instrumentation readouts Industrial control indicator Relay driver Block and Connection Diagrams TL/F/6141 – 1 FIGURE 1. MM5484 PLCC Dual-In-Line Package TL/F/6141 – 3 Top View Order Number MM5484N See NS Package Number N22A TL/F/6141 – 6 Top View Order Number MM5484V See NS Package Number V28A COPSTM is a trademark of National Semiconductor Corp. C1995 National Semiconductor Corporation TL/F/6141 RRD-B30M105/Printed in U. S. A. MM5484 16-Segment LED Display Driver February 1995 Absolute Maximum Ratings Operating Temperature If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Voltage at LED Outputs b 40§ C to a 150§ C Power Dissipation at 25§ C Molded DIP Package, board mount Molded DIP Package, socket mount *Molded DIP Package, board mount, derate 15.8m W/§ C above 25§ C. **Molded DIP Package, socket mount, derate 14.5m W/§ C above 25§ C. Lead Temperature (Soldering, 10 sec.) VSS b 0.5V to VSS a 12V VSS b 0.5V to VSS a 10V Voltage at Other Pins b 40§ C to a 85§ C Storage Temperature 2W* 1.8W** iJA e 63§ C/W, iJA e 69§ C/W, 300§ C DC Electrical Characteristics VDD e 4.5V to 9V, TA e b40§ C to a 85§ C unless otherwise specified Parameter Conditions Min Supply Voltage Typ Max 9 V 5 10 mA VDD a 0.5 V 0.8 7.5 V mA pF 0.5 50 V V mA 1.0 V 4.5 Supply Current Logic One Input High Level VIH 2.4 Logic Zero Input Low Level VIL Input Current Input Capacitance 0 High or Low Level g1 Units OUTPUTS Data Output Voltage High Level VOH Low Level VOL Segment Off (Logic Zero on Input) IOUT e 0.1 mA IOUT e b0.1 mA VOUT e 12V REXT e 400X Output Current Segment On (Logic One on Input) Output Voltage IOUT e 15 mA VDD t 6V VDD b 0.5 0.5 AC Electrical Characteristics (See Figure 3 .) VDD e 4.5V to 9V, TA e b40§ C to a 85§ C unless otherwise specified Symbol Parameter Conditions Min Typ Max Units 0.5 MHz fC Clock Frequency th High Time 0.95 ms tl Low Time 0.95 ms tS1 Data Setup Time 0.5 ms tH1 Data Hold Time 0.5 ms tS2 Enable Setup Time 0.5 ms tH2 Enable Hold Time 0.5 tpd Data Out Delay ms 0.5 Note 1: Under no condition should the power dissipated by the segment driver exceed 50 mW nor the entire chip power dissipation exceed 500 mW. Note 2: AC input waveform specification for test purpose: tr s 20 ns, tf s 20 ns, f e 500 kHz, 50% g 10% duty cycle. Note 3: Clock input rise and fall times must not exceed 500 ns. 2 ms Functional Description When the ENABLE signal goes to a low (logic zero state), the contents of the shift register is latched and the display will show the new data. While new data is being loaded into the SR the display will continue to show the old data. For the MM5484, data is output from the serial DATA OUT pin on the falling edge of clock so cascading is made simple with race hazards eliminated. When the chip first powers on, an internal power on reset signal is generated which resets the SR and latches to zero so that the display will be off. The MM5484 is designed to drive LED displays directly. Serial data transfer from the data source to the display driver is accomplished with 3 signals, DATA IN, CLOCK and ENABLE. The signal ENABLE acts as an envelope and only while this signal is at a logic ‘1’ do the circuits recognize the clock signal. While ENABLE is high, data on the serial data input is transferred and shifted in the internal shift register on the rising clock edge, i.e. a logic ‘0’ to logic ‘1’ transition. Timing Diagram TL/F/6141 – 5 FIGURE 3 Physical Dimensions inches (millimeters) Molded Dual-In-Line Package (N) Order Number MM5484N NS Package Number N22A 3 MM5484 16-Segment LED Display Driver Physical Dimensions inches (millimeters) (Continued) 28-Pin Plastic Leaded Chip Carrier (V) Order Number MM5484V NS Package Number V28A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 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Tel: 81-043-299-2309 Fax: 81-043-299-2408 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.