深圳市美芯微电子有限公司 ÿÿÿÿÿÿÿÿÿÿÿÿ电话：０７５５－３６８５７６０９／２７９４５５５１／２９４９１８８２ 地址：深圳市宝安区宝源路名优产品采购中心Ｂ１区７２１室 地址：深圳市宝安区宝源路名优产品采购中心Ｂ１区７２１室 OTP Encoder 麦肯单片机授权一级代理商 MDT75C277 MDT75C277 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 I/O OSCR I Function Description Connect a resistor to Vdd to adjust internal RC freq. Vdd Positive power supply 3.0V ~ 12 V. Vss Ground. TXD O Data output pin. K0 I Data input with pull low Resistor. K1 I Data input with pull low Resistor. K2 I Data input with pull low Resistor. K3 I 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 ｈｔｔｐ：／／ｗｗｗ．ｍｘｍｃｕ．ｃｏｍ．ｃｎ P.1 2007/5 Ver. 1.1 MDT75C277 OTP Encoder 5.Output Data Reporting Output data frame Preamble C0 ~ C19 ( 1048576 address codes ) D0 D1 D2 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 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 This specification is subject to be changed without notice. Please visit our web site for the most updated ｈｔｔｐ：／／ｗｗｗ．ｍｘｍｃｕ．ｃｏｍ．ｃｎ 2007/5 Ver. 1.1 D3 MDT75C277 OTP Encoder 7. Absolute Maximum Rating Symbol Vdd Parameter Conditions Supply Voltage Rating Unit -0.3 ~ 13 V Vi Input Voltage -0.3 ~ Vdd+0.3 V Vo Output Voltage -0.3 ~ Vdd+0.3 V Tst Storage Temp. -40 ~ 125 Top Operating Temp. -20 ~ 70 Pdis Max. Power dissipation Vdd = 12V 300 mV 8. DC Electrical Characteristics (TA=0℃ to 70℃) Symbol Parameters Conditions Vdd Operating Voltage Isb Stand by current Min. Typ. Max. Unit 3.0 8 12 V Vdd = 12V, OSC stop K0 ~ K3 = Low Output Unloaded 1.0 3.0 uA Vdd =12V 0.5 1.0 mA Iop Operating current Ioh Source current Vdd =12V, Voh = 6V 4.5 mA Iol Sink Current Vdd =12V, Vol = 6V 4.5 mA Fop Operating Freq Vdd=11V, Rext=360K ~ 430K ohm 80K HZ 9. External oscillator resistor selection table ( Reference ) Voltage\Rosc 390 K ohm 430 K ohm 470 K ohm HZ current HZ current HZ current 13 V 80.8 K 338µA 72.7 K 323µA 67.8 K 315µA 12 V 82.5 K 260µA 73.8 K 252µA 69.0 K 248µA 11 V 83.8 K 203µA 75.0 K 195µA 69.9 K 195µA 10 V 85.6 K 162µA 77.4 K 150µA 71.7 K 150µA 9V 88.4 K 117µA 78.7 K 113µA 73.7 K 113µA 8V 90.9 K 80µA 81.4 K 77µA 76.5 K 77µA 7V 88.9 K 50µA 80.7 K 48µA 75.5 K 48µA 6.5 V 85.1 K 38µA 77.4 K 36µA 72.7 K 35µA This specification is subject to be changed without notice. Please visit our web site for the most updated ｈｔｔｐ：／／ｗｗｗ．ｍｘｍｃｕ．ｃｏｍ．ｃｎ 2007/5 Ver. 1.1 MDT75C277 OTP Encoder 390 K ohm Voltage\Rosc 430 K ohm 470 K ohm HZ current HZ current HZ current 6V 56.7 K 26µA 52.5 K 25µA 49.4 K 24µA 5V 50.3 K 14µA 45.1 K 14µA 42.1 K 14µA 4.5 V 46.4 K 11µA 41.0 K 11µA 39.0 K 11µA 4V 41.2 K 8µA 37.6 K 8µA 35.2 K 8µA 3.3 V 27.4 K 6µA 25.0 K 6µA 23.9 K 6µA 3V 22.2 K 5µA 19.8 K 5µA 19.0 K 5µA 2.7 V 16.6 K 5µA 14.8 K 5µA 14.2 K 5µA 2.5 V 12.7 K 3µA 11.6 K 3µA 11.0 K 3µA 10. Application circuit ( Reference ) Vdd ROSC 1 2 + 4.7u 3 0.1u R1 1MΩ 4 OSCR K3 VDD K2 VSS K1 TXD K0 8 SW3 7 SW2 6 SW1 5 SW0 Vss Transmitter Circuit This specification is subject to be changed without notice. Please visit our web site for the most updated ｈｔｔｐ：／／ｗｗｗ．ｍｘｍｃｕ．ｃｏｍ．ｃｎ 2007/5 Ver. 1.1 MDT75C277 OTP Encoder (a). If encoder circuit has one switch only to control ON/OFF power & key data together, then circuit must add R1 resister 1MΩ . (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 ｈｔｔｐ：／／ｗｗｗ．ｍｘｍｃｕ．ｃｏｍ．ｃｎ 2007/5 Ver. 1.1