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| MDT75C277 OTP Encoder 1. General Description The MDT75C277 is an OTP Encoder using CMOS technology. It has a maximum of 20 bits addressing code providing up to one million codes. It can reduce any code collision and unauthorized code scanning possibilities. 2. Features CMOS technology. Wide range of Operating Voltage : Vdd = 3.0V ~ 12V. Up to 4 data pins. Total 1048576 address codes. Built-in RC oscillator with single external resistor. Available in DIP and SOP package. Automatically enter sleep mode if press button over 3 ~ 5 sec 3. Pin Assignment MDT75C277P / 75C277S 8 pin DIP / SOP OSCR 1 8 Vdd 2 7 Vss 3 6 TXD 4 5 K3 K2 K1 K0 4. Pin Function Description Symbol OSCR Vdd Vss TXD K0 K1 K2 K3 O I I I I I/O I Function Description Connect a resistor to Vdd to adjust internal RC freq. Positive power supply 3.0V ~ 12 V. Ground. Data output pin. Data input with pull low Resistor. Data input with pull low Resistor. Data input with pull low Resistor. Data input with pull low Resistor. 1 of 1 2006/10/11 Ver. 1.5 This specification is subject to be changed without notice. Please visit our web site for the most updated information. http://www.mdtic.com.tw MDT75C277 OTP Encoder 5.Output Data Reporting Output data frame Preamble Preamble : 4 Ick Data High : 12 Ick Data Low : 4 Ick Note : 1 Ick = 8 OSC clocks 6. Key 0 ~ 3 combination table K3 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 K2 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 K1 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 K0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 D3 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 D2 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 D1 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 D0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 12 Ick 4 Ick 124 Ick for 75C277 C0 ~ C19 ( 1048576 address codes ) D0 D1 D2 D3 2 of 2 2006/10/11 Ver. 1.5 This specification is subject to be changed without notice. Please visit our web site for the most updated information. http://www.mdtic.com.tw MDT75C277 OTP Encoder 7. Absolute Maximum Rating Symbol Vdd Vi Vo Tst Top Pdis Parameter Supply Voltage Input Voltage Output Voltage Storage Temp. Operating Temp. Max. Power dissipation Conditions Rating -0.3 ~ 13 -0.3 ~ Vdd+0.3 -0.3 ~ Vdd+0.3 -40 ~ 125 -20 ~ 70 Unit V V V Vdd = 12V 300 mV 8. DC Electrical Characteristics (TA=0J to 70J) Symbol Vdd Isb Parameters Operating Voltage Stand by current Conditions Min. 3.0 Typ. 5 Max. 12 Unit V Vdd = 12V, OSC stop K0 ~ K3 = Low Output Unloaded 1 20 uA Iop Ioh Iol Fop Operating current Source current Sink Current Operating Freq Vdd =12V Vdd =12V, Voh = 6V Vdd =12V, Vol = 6V Vdd=11V, Rext=390K ~ 510K ohm 4.5 4.5 0.6 1.0 mA mA mA 80K HZ 3 of 3 2006/10/11 Ver. 1.5 This specification is subject to be changed without notice. Please visit our web site for the most updated information. http://www.mdtic.com.tw MDT75C277 OTP Encoder 9. External oscillator resistor selection table (Vdd=11V) Rext (ohm) Freq. (Hz) Operating Current 476 A 482 A 517 A 520 A 523 A 525 A 528 A 532 A 535 A 539 A 545 A 553 A 1.2 M ( Max ) 1M 680 K 620 K 560 K 510 K 470 K 430 K 390 K 360 K 330 K 300 K ( Min ) 33.9 K 36.9 K 51.4 K 55.0 K 59.6 K 64.7 K 69.2 K 73.2 K 78.2 K 82.3 K 88.5 K 96.2 K 4 of 4 2006/10/11 Ver. 1.5 This specification is subject to be changed without notice. Please visit our web site for the most updated information. http://www.mdtic.com.tw MDT75C277 OTP Encoder D ifferent Rosc (F & V) 100.0K 95.0K 90.0K 85.0K 80.0K 75.0K 70.0K 65.0K 60.0K 55.0K 50.0K 560K 510K 470K 430K F (hz) 6V 7V 8V 9V 10V 11V 12V 560K 77.1K 73.2K 70.3K 67.8K 65.8K 64.1K 62.9K 510K 85.1K 80.6K 77.1K 74.4K 72.1K 70.2K 69.0K 470K 8.9K 84.4K 81.0K 78. 6K 76.2K 74.4K 73.2K Voltage 430K 95.8K 91.2K 87.4K 84. 0K 81.6K 79.8K 78.0K Rosc = 470K 120.0K 115.0K 110.0K 105.0K 100.0K 95.0K 90.0K 85.0K 80.0K 75.0K 70.0K 65.0K 60.0K 3V 4V 5V 6V 7V 8V 9V 10V 11V 12V - 4 0J - 2 0J 0J 25J 50J 80J 5 of 5 2006/10/11 Ver. 1.5 This specification is subject to be changed without notice. Please visit our web site for the most updated information. http://www.mdtic.com.tw MDT75C277 OTP Encoder 10. Application circuit ( Reference ) Vdd ROSC 1 OSCR K3 8 7 VDD K2 SW3 SW2 SW1 SW0 2 + 4.7u 0.1u R1 1M[ 3 VSS K1 6 5 TXD K0 4 Vss Transmitter Circuit (a). If encoder circuit has one switch only to control ON/OFF power & key data together, then circuit must add R1 resister 1M[ . (b). To increase the stability of RC oscillator can add 100 pF capacitor at Rosc in parallel . (c). To increase the stability of K3 ~ K0 key data can increase pull low resister 100K connect key and Vss , K3 ~ K0 internal pull low resister is 450K (Vdd=9V), 6 of 6 2006/10/11 Ver. 1.5 This specification is subject to be changed without notice. Please visit our web site for the most updated information. http://www.mdtic.com.tw MDT75C277 OTP Encoder TXD 7 of 7 2006/10/11 Ver. 1.5 This specification is subject to be changed without notice. Please visit our web site for the most updated information. http://www.mdtic.com.tw |
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