MM5483 Liquid Crystal Display Driver General Description Features 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 41⁄2digit 7-segment display with minimal interface between the display and the data source. n n n n n n n The MM5483 stores the display data in latches after it is latched in, and holds the data until another load pulse is received. Serial data input Serial data output Wide power supply operation TTL compatibility 31 segment outputs Alphanumeric and bar graph capability Cascade capability Applications n n n n n COPS™ or microprocessor displays Industrial control indicator Digital clock, thermometer, counter, voltmeter Instrumentation readouts Remote displays Block and Connection Diagrams 00614001 FIGURE 1. COPS™ is a trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation DS006140 www.national.com MM5483 Liquid Crystal Display Driver May 2002 MM5483 Block and Connection Diagrams (Continued) Dual-In-Line Package 00614002 Top View Order Number MM5483N See NS Package Number N40A 00614007 Order Number MM5483V See NS Package Number V44A FIGURE 2. www.national.com 2 Storage Temperature If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Power Dissipation Operating Temperature 300 mW at +85˚C 350 mW at +25˚C Junction Temperature VSS to VSS +10V Voltage at Any Pin −65˚C to +150˚C +150˚C Lead Temperature (Soldering, 10 seconds) −40˚C to +85˚C 300˚C DC Electrical Characteristics TA within operating range, VDD = 3.0V to 10V, VSS = 0V, unless otherwise specified Parameter Conditions Min Max Units 10 V 2.5 µA VDD = 5.0V 10 µA VDD = 10.0V 40 µA 0.9 Power Supply Typ 3.0 Average Supply Current, IDD All Outputs Bits = Open, Data Out = Open, BP_Out = Open, Clock In = 0V, Data In = 0V, Data Load = 0V, Osc In = 0V, BP_In = 32Hz VDD = 3.0V 1.5 Input Voltage Levels Logic “0” Logic “1” Logic “0” Logic “1” Load, Clock, Data VDD = 5.0V VDD = 5.0V VDD = 3.0V VDD = 3.0V 2.4 2.0 V V V V Output Current Levels Segments and Data Out Sink Source VDD = 3.0V, VOUT = 0.3V VDD = 3.0V, VOUT = 2.7V 20 20 µA µA BP Out Sink BP Out Source VDD = 3.0V, VOUT = 0.3V VDD = 3.0V, VOUT = 2.7V 320 320 µA µA 0.4 AC Electrical Characteristics VDD ≥ 4.7V, VSS = 0V unless otherwise specified Symbol Parameter fC Clock Frequency, VDD = 3V tCH Clock Period High tCL tDS Min (Notes 2, 3) Typ Max Units 500 kHz 500 ns Clock Period Low 500 ns 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 tCDO Clock to Data Valid ns 400 750 ns Note 1: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices should be operated at these limits. The table of “Electrical Characteristics” specifies conditions of device operation. Note 2: AC input waveform specification for test purpose: tr ≤ 20 ns, tf ≤ 20 ns, f = 500 kHz, 50% ± 10% duty cycle. Note 3: Clock input rise and fall times must not excced 300 ms. Note 4: Output offset voltage is ± 50 mV with CSEGMENT = 250 pF, CBP = 8750 pF. 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 TTL-compatible output. 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 3 www.national.com MM5483 Absolute Maximum Ratings (Note 1) MM5483 Functional Description (Continued) 00614003 FIGURE 3. Three-Wire Control Mode 00614004 FIGURE 4. Data Format Diagram 00614005 FIGURE 5. Two-Wire Control Mode www.national.com 4 MM5483 Functional Description (Continued) 00614006 FIGURE 6. Timing Diagram 5 www.national.com MM5483 Physical Dimensions inches (millimeters) unless otherwise noted Molded Dual-In-Line Package (N) Order Number MM5483N NS Package Number N40A Order Number MM5483V NS Package Number V44A www.national.com 6 MM5483 Liquid Crystal Display Driver Notes 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 AND GENERAL COUNSEL 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. 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. BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. National Semiconductor Americas Customer Support Center Email: [email protected] Tel: 1-800-272-9959 www.national.com National Semiconductor Europe Customer Support Center Fax: +49 (0) 180-530 85 86 Email: [email protected] Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Support Center Email: [email protected] National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: [email protected] Tel: 81-3-5639-7560 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.