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| MDT75C275 OTP Encoder 1. General Description The MDT75C275 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. Low standby current : 1.0 uA. 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. No Sleep mode 3. Pin Assignment MDT75C275P / 75C275S 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. This specification is subject to be changed without notice. Please visit our web site for the most updated information. http://www.mdtic.com.tw P.1 2007/5 Ver. 1.0 MDT75C275 OTP Encoder 5.Output Data Reporting Output data frame Preamble C0 ~ C19 ( 1048576 address codes ) D0 D1 D2 D3 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 This specification is subject to be changed without notice. Please visit our web site for the most updated information. http://www.mdtic.com.tw P.2 2007/5 Ver. 1.0 MDT75C275 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 Vdd = 12V Conditions Rating -0.3 ~ 13 -0.3 ~ Vdd+0.3 -0.3 ~ Vdd+0.3 -40 ~ 125 -20 ~ 70 300 mV Unit V V V 8. DC Electrical Characteristics (TA=0 to 70) Symbol Vdd Isb Parameters Operating Voltage Stand by current Vdd = 12V, OSC stop K0 ~ K3 = Low Output Unloaded Vdd =12V Vdd =12V, Voh = 6V Vdd =12V, Vol = 6V Vdd=11V, Rext=360K ~ 430K ohm 4.5 4.5 80K Conditions Min. 3.0 Typ. 8 1.0 0.5 Max. 12 3.0 1.0 Unit V uA mA mA mA HZ Iop Ioh Iol Fop Operating current Source current Sink Current Operating Freq 9. External oscillator resistor selection table ( Reference ) 390 K ohm HZ 13 V 12 V 11 V 10 V 9V 8V 7V 6.5 V 80.8 K 82.5 K 83.8 K 85.6 K 88.4 K 90.9 K 88.9 K 85.1 K current 338A 260A 203A 162A 117A 80A 50A 38A 430 K ohm HZ 72.7 K 73.8 K 75.0 K 77.4 K 78.7 K 81.4 K 80.7 K 77.4 K current 323A 252A 195A 150A 113A 77A 48A 36A 470 K ohm HZ 67.8 K 69.0 K 69.9 K 71.7 K 73.7 K 76.5 K 75.5 K 72.7 K current 315A 248A 195A 150A 113A 77A 48A 35A Voltage\Rosc This specification is subject to be changed without notice. Please visit our web site for the most updated information. http://www.mdtic.com.tw P.3 2007/5 Ver. 1.0 MDT75C275 OTP Encoder Voltage\Rosc 6V 5V 4.5 V 4V 3.3 V 3V 2.7 V 2.5 V 390 K ohm HZ 56.7 K 50.3 K 46.4 K 41.2 K 27.4 K 22.2 K 16.6 K 12.7 K current 26A 14A 11A 8A 6A 5A 5A 3A 430 K ohm HZ 52.5 K 45.1 K 41.0 K 37.6 K 25.0 K 19.8 K 14.8 K 11.6 K current 25A 14A 11A 8A 6A 5A 5A 3A 470 K ohm HZ 49.4 K 42.1 K 39.0 K 35.2 K 23.9 K 19.0 K 14.2 K 11.0 K current 24A 14A 11A 8A 6A 5A 5A 3A 10. Application circuit ( Reference ) Vdd ROSC 1 2 3 OSCR VDD VSS TXD K3 K2 K1 K0 8 7 6 5 SW3 SW2 SW1 SW0 + 4.7u 0.1u R1 1M 4 Vss Transmitter Circuit This specification is subject to be changed without notice. Please visit our web site for the most updated information. http://www.mdtic.com.tw P.4 2007/5 Ver. 1.0 MDT75C275 OTP Encoder (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 300K (Vdd=9V), TXD This specification is subject to be changed without notice. Please visit our web site for the most updated information. http://www.mdtic.com.tw P.5 2007/5 Ver. 1.0 |
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