MM5483 Liquid Crystal Display Driver Y General Description Y The MM5483 is a monolithic integrated circuit utilizing CMOS metal-gate low-threshold enhancement mode devices. It is available in a 40-pin molded package. The chip can drive up to 31 segments of LCD and can be cascaded to increase this number. This chip is capable of driving a 4(/2digit 7-segment display with minimal interface between the display and the data source. The MM5483 stores the display data in latches after it is latched in, and holds the data until another load pulse is received Y Y Y Applications Y Y Y Y Y Features Y Y Wide power supply operation TTL compatibility 31 segment outputs Alphanumeric and bar graph capability Cascade capability COPSTM or microprocessor displays Industrial control indicator Digital clock, thermometer, counter, voltmeter Instrumentation readouts Remote displays Serial data input Serial data output Block and Connection Diagrams Dual-In-Line Package TL/F/6140 – 1 FIGURE 1 TL/F/6140 – 2 Top View FIGURE 2 Order Number MM5483MS or MM5483N See SSOP Package Number MS40A See NS Package Number N40A TL/F/6140 – 7 Order Number MM5483V See NS Package Number V44A COPSTM is a trademark of National Semiconductor Corporation. C1995 National Semiconductor Corporation TL/F/6140 RRD-B30M105/Printed in U. S. A. MM5483 Liquid Crystal Display Driver February 1995 Absolute Maximum Ratings Power Dissipation If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Voltage at Any Pin Junction Temperature Lead Temperature (Soldering, 10 seconds) VSS to VSS a 10V b 40§ C to a 85§ C b 65§ C to a 150§ C Operating Temperature Storage Temperature 300 mW at a 85§ C 350 mW at a 25§ C a 150§ C 300§ C DC Electrical Characteristics TA within operating range, VDD e 3.0V to 10V, VSS e 0V, unless otherwise specified Parameter Conditions Min Power Supply Typ Max Units 10 V 9 17 35 15 25 45 mA mA mA 1.5 2.5 mA 0.9 3.0 Power Supply Current R e 1M, C e 470 pF, Outputs Open VDD e 3.0V VDD e 5.0V VDD e 10.0V OSC e 0V, Outputs Open, BPIN e 32 Hz, VDD e 3.0V Input Voltage Levels Logic ‘‘0’’ Logic ‘‘1’’ Logic ‘‘0’’ Logic ‘‘1’’ Load, Clock, Data VDD e 5.0V VDD e 5.0V VDD e 3.0V VDD e 3.0V 2.4 2.0 V V V V Output Current Levels Segments and Data Out Sink Source VDD e 3.0V, VOUT e 0.3V VDD e 3.0V, VOUT e 2.7V 20 20 mA mA BP OUT Sink Source VDD e 3.0V, VOUT e 0.3V VDD e 3.0V, VOUT e 2.7V 320 320 mA mA 0.4 AC Electrical Characteristics VDD t 4.7V, VSS e 0V unless otherwise specified Symbol Parameter fC Clock Frequency, VDD e 3V tCH Clock Period High tCL Min (Notes 1, 2) Typ Max Units 500 kHz 500 ns Clock Period Low 500 ns tDS Data Set-Up before Clock 300 ns tDH Data Hold Time after Clock 100 ns tLW Minimum Load Pulse Width 500 ns tLTC Load to Clock 400 ns tCDO Clock to Data Valid 400 750 ns Note 1: 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 2: Clock input rise and fall times must not exceed 300 ns. Note 3: Output offset voltage is g 50 mV with CSEGMENT e 250 pF, CBP e 8750 pF. Functional Description A block diagram for the MM5483 is shown in Figure 1 and a package pinout is shown in Figure 2 . Figure 3 shows a possible 3-wire connection system with a typical signal format for Figure 3 . Shown in Figure 4 , the load input is an asynchronous input and lets data through from the shift register to the output buffers any time it is high. The load input can be connected to VDD for 2-wire control as shown in Figure 5 . In the 2-wire control mode, 31 bits (or less depending on the number of segments used) of data are clocked into the MM5483 in a short time frame (with less than 0.1 second there probably will be no noticeable flicker) with no more clocks until new information is to be displayed. If data was slowly clocked in, it can be seen to ‘‘walk’’ across the display in the 2-wire mode. An AC timing diagram can be seen in Figure 6 . It should be noted that data out is not a TTLcompatible output. 2 Functional Description (Continued) TL/F/6140 – 3 FIGURE 3. Three-Wire Control Mode TL/F/6140 – 4 FIGURE 4. Data Format Diagram TL/F/6140 – 5 FIGURE 5. Two-Wire Control Mode TL/F/6140 – 6 FIGURE 6. Timing Diagram 3 4 Physical Dimensions inches (millimeters) 40-Lead Molded Shrink Small Outline Package, JEDEC Order Number MM5483MS NS Package Number MS40A Molded Dual-In-Line Package (N) Order Number MM5483N NS Package Number N40A 5 MM5483 Liquid Crystal Display Driver Physical Dimensions inches (millimeters) (Continued) Order Number MM5483V NS Package Number V44A 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. National Semiconductor Corporation 1111 West Bardin Road Arlington, TX 76017 Tel: 1(800) 272-9959 Fax: 1(800) 737-7018 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 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