MM5450/51 LED Display Driver Features General Description • • • • • • • • The MM5450 and MM5451 LED display drivers are monolithic MOS IC’s fabricated in an N-Channel, metal-gate process. The technology produces low-threshold, enhancement-mode, and ion-implanted depletion-mode devices.
MM5450/51 OUTPUT BIT 18 OUTPUT BIT 19 OUTPUT BIT 20 OUTPUT BIT 21 OUTPUT BIT 22 OUTPUT BIT 23 V SS OUTPUT BIT 14 OUTPUT BIT 15 OUTPUT BIT 16 OUTPUT BIT 17 OUTPUT BIT 13 Connection Diagram: Die OUTPUT BIT 12 OUTPUT BIT 24 OUTPUT BIT 25 OUTPUT BIT 26 OUTPUT BIT 11 OUTPUT BIT 10 OUTPUT BIT 9 OUTPUT BIT 8 OUTPUT BIT 7 MM5450/5451 DIE PINOUT V SS OUTPUT BIT 27 OUTPUT BIT 28 OUTPUT BIT 29 V SS OUTPUT BIT 6 OUTPUT BIT 5 OUTPUT BIT 4 OUTPUT BIT 30 OUTPUT BIT 31 OUTPUT BIT 32 OUTPUT BIT 3 OUTPUT BIT 33
MM5450/51 Connection Diagram: Dual-Inline Package (DIP) V SS 1 40 OUTPUT BIT 18 V SS 1 40 OUTPUT BIT 18 OUTPUT BIT 17 2 39 OUTPUT BIT 19 OUTPUT BIT 17 2 39 OUTPUT BIT 19 OUTPUT BIT 16 3 38 OUTPUT BIT 20 OUTPUT BIT 16 3 38 OUTPUT BIT 20 OUTPUT BIT 15 4 37 OUTPUT BIT 21 OUTPUT BIT 15 4 37 OUTPUT BIT 21 OUTPUT BIT 14 5 36 OUTPUT BIT 22 OUTPUT BIT 14 5 36 OUTPUT BIT 22 OUTPUT BIT 13 6 35 OUTPUT BIT 23 OUTPUT BIT 13 6 35 OUTPUT BIT 23 OUTPUT BIT 12 7 34 OUTPUT
MM5450/51 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings † Voltage (Any Pin)................................................................................................................................... VSS to VSS + 12V Power Dissipation (+25°C) ...........................................................................................................................................1W Power Dissipation (+85°C) ..................................................................................
MM5450/51 TABLE 1-1: ELECTRICAL CHARACTERISTICS Electrical Characteristics: 4.5V ≤ VDD ≤ 11V, VSS = 0V; TA = 25°C, bold values valid for –40°C ≤ TA ≤ +85°C, unless otherwise noted. Parameter Symbol Power Supply Current — Data Input Voltage Brightness Control Input Current Output Sink Current Min. Typ. Max. — — 8.5 10 Units mA Conditions –25°C to +85°C, excluding output loads — — VL –0.3 — 0.8 Logic-0 level, ±10 µA input bias VH 2.2 — VDD Logic-1 level, 4.75V ≤ VDD ≤ 5.
MM5450/51 TEMPERATURE SPECIFICATIONS (Note 1) Parameters Sym. Min. Typ. Max. Units Conditions Ambient Temperature Range TA –40 — +85 °C — Storage Temperature Range TS –65 — +150 °C — Junction Temperature TJ — — +150 °C — Lead Temperature — — — +300 °C — Temperature Ranges Note 1: The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction temperature and the thermal resistance from junction to air (i.e., TA, TJ, JA).
MM5450/51 2.0 TYPICAL PERFORMANCE CURVES The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
MM5450/51 3.0 FUNCTIONAL DESCRIPTION The MM5450 and MM5451 are designed to drive either 4- or 5-digit alphanumeric LED displays with the added benefit of requiring minimal interface with the display or data source. Data is transferred serially via two signals: clock and serial data. Data transfer without the added inconvenience of an external load signal is accomplished by using a format of a leading “1” followed by the allowed 35 data bits.
MM5450/51 4.0 TYPICAL APPLICATIONS RAW DC ! 9 9 LM317 5V 240 ȍ 1k ¨9 I 19 – 5k LM324 20 2N2907 + I 19 = 9 ¨9 20 1K CD4046 (VCO) PIN 19 Q 19 MM5450 10 μS 1 MM5450 1 MM74HC123 FIGURE 4-1: Typical Application of Constant Current Brightness Control. FIGURE 4-2: the Duty Cycle. Brightness Control Varying LED DISPLAY AM FM 34 MM5450 DISPLAY DRIVER KEYBOARD ELECTRONIC TUNING CONTROLLER PLL SYNTHESIZER STATION DETECT, ETC. FIGURE 4-3: Basic Electronically Tuned Radio System.
MM5450/51 VLED = 3.0V VLED = 3.0V VLED 9–16 VLED 2–8, 40 32–39 24–31 MM5450 18 21 22 19 20 CLOCK IN DATA IN BRIGHTNESS CONTROL FIGURE 4-4: DS20005651A-page 10 1 23 17 VDD 100k TYP. Duplexing Eight Digits with One MM5450. 2016 Microchip Technology Inc.
MM5450/51 5.0 PACKAGING INFORMATION 5.1 Package Marking Information 40-Pin PDIP* Example XXXXXX XXXXXXXX WNNN MICREL MM5451YN 6235 44-Pin PLCC* XXXXXX XXXXXXXX WNNN Legend: XX...X Y YY WW NNN e3 * Example MICREL MM5450YV 8943 Product code or customer-specific information Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week ‘01’) Alphanumeric traceability code Pb-free JEDEC® designator for Matte Tin (Sn) This package is Pb-free.
MM5450/51 40-Lead PDIP Package Outline and Recommended Land Pattern Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging. DS20005651A-page 12 2016 Microchip Technology Inc.
MM5450/51 44-Lead PLCC Package Outline and Recommended Land Pattern Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging. 2016 Microchip Technology Inc.
MM5450/51 NOTES: DS20005651A-page 14 2016 Microchip Technology Inc.
MM5450/51 APPENDIX A: REVISION HISTORY Revision A (October 2016) • Converted Micrel document MM5450/51 to Microchip data sheet DS20005651A. • Minor text changes throughout. • Corrected Pin 26 of the MM5451YV in Connection Diagram: Plastic-Leaded Chip Carrier (PLCC) to read Output Bit 35. • Corrected the minimum value for Reset Pad Current in Table 1-1 to be –8 µA. 2016 Microchip Technology Inc.
MM5450/51 NOTES: DS20005651A-page 16 2016 Microchip Technology Inc.
MM5450/51 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office. PART NO.
MM5450/51 NOTES: DS20005651A-page 18 2016 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature.
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