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| MDT75C271 OTP Encoder 1. General Description The MDT75C271 i s 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 l l l l l l l l CMOS technology. Low standby current : 1.0 uA. Wide range of Operating Voltage : Vdd = 4.5V ~ 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 6 ~ 10 sec 3. Pin Assignment MDT75C271P / 75C271S 8 pin DIP / SOP OSCR Vdd Vss TXD 1 2 3 4 8 7 6 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 4.5V ~ 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. 1 of 5 2005/1/6 Ver. 1.2 MDT75C271 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 75C271 C0 ~ C19 ( 1048576 address codes ) D0 D1 D2 D3 This specification is subject to be changed without notice. Please visit our web site for the most updated information. 2 of 5 2005/1/6 Ver. 1.2 MDT75C271 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=0J to 70J) Symbol Vdd Isb Parameters Operating Voltage Stand by current Vdd = 12V, OSC stop K0 ~ K3 = Low Output Unloaded Iop Ioh Iol Fop Operating current Source current Sink Current Operating Freq Vdd =12V Vdd =12V, Voh = 6V Vdd =12V, Vol = 6V Vdd=10V, Rext=390K ohm 4.5 4.5 80K 0.5 1.0 mA mA mA HZ 1.0 3.0 uA Conditions Min. 4.5 Typ. 5 Max. 12 Unit V 9. External oscillator resistor selection table (Vdd=11V) Rext (ohm) 510 K 470 K 430 K 390 K 360 K 330 K Freq. (Hz) 65.0 K 65.0 K 72.7 K 79.6 K 82.9 K 90.4 K Operating Current 443 A 444 A 445 A 447 A 449 A 451 A This specification is subject to be changed without notice. Please visit our web site for the most updated information. 3 of 5 2005/1/6 Ver. 1.2 MDT75C271 OTP Encoder 10. Application circuit Vdd ROSC 1 OSCR 2 VDD 3 VSS 4 TXD K0 K1 K2 K3 8 7 6 5 SW3 SW2 SW1 SW0 Vss Transmitter Circuit This specification is subject to be changed without notice. Please visit our web site for the most updated information. 4 of 5 2005/1/6 Ver. 1.2 MDT75C271 OTP Encoder TXD This specification is subject to be changed without notice. Please visit our web site for the most updated information. 5 of 5 2005/1/6 Ver. 1.2 |
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