MDT75C277 otp encoder 1 of 1 2006/ 10/ 11 ver. 1.5 thi s speci fi cat i on i s subject t o be changed wi t hout not i ce. pl ease vi si t our web si t e for t h e m o st updat e d 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 o s c r 1 8 k3 v d d 2 7 k2 v s s 3 6 k 1 t x d 4 5 k 0 4. pin function description sy m b o l i / o function d e s c r i p t i o n oscr i connect a resistor to vdd to adjust internal rc freq. vdd positive power supply 3.0v ~ 12 v. v s s g r o u n d . txd o data output pin. k0 i data input with pull low resistor. k1 i data input with pull low resistor. k 2 i data input with pull low resistor. k3 i data input with pull low resistor. inform ation. http://www.m d tic.com .tw
MDT75C277 otp encoder 2 of 2 2006/ 10/ 11 ver. 1.5 thi s speci fi cat i on i s subject t o be changed wi t hout not i ce. pl ease vi si t our web si t e for t h e m o st updat e d 5.output data reporting output data frame preamble c0 ~ c19 ( 1048576 address codes ) d0 d1 d2 d3 p r e a m b l e : 4 ick 124 ick for 75c277 data high : 12 ick 4 ick data low : 4 i c k 1 2 i c k note : 1 ick = 8 osc clocks 6. key 0 ~ 3 combination table k 3 k 2 k 1 k 0 d 3 d 2 d 1 d 0 0 0 0 1 0 0 0 1 0 0 1 0 0 0 1 0 0 0 1 1 0 0 1 1 0 1 0 0 0 1 0 0 0 1 0 1 0 1 0 1 0 1 1 0 0 1 1 0 0 1 1 1 0 1 1 1 1 0 0 0 1 0 0 0 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 1 1 0 1 1 1 1 0 1 1 1 0 1 1 1 1 1 1 1 1 inform ation. http://www.m d tic.com .tw
MDT75C277 otp encoder 3 of 3 2006/ 10/ 11 ver. 1.5 thi s speci fi cat i on i s subject t o be changed wi t hout not i ce. pl ease vi si t our web si t e for t h e m o st updat e d 7. absolute m aximum rating s y m b o l p a r a m e t e r conditions r a t i n g u n i t vdd supply voltage -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 (t a =0 j to 70 j) sy m b o l p a r a m e t e r s c o n d i t i o n s min. ty p . m a x . u n i t v d d o p e r a t i n g v o l t a g e 3 . 0 5 1 2 v isb stand by current vdd = 12v, osc stop k0 ~ k3 = low output unloaded 1 2 0 u a i o p o p e r a t i n g c u r r e n t vdd =12v 0.6 1.0 ma i o h s o u r c e c u r r e n t vdd =12v, voh = 6v 4.5 ma i o l s i n k c u r r e n t vdd =12v, vol = 6v 4.5 ma f o p o p e r a t i n g f r e q v d d = 1 1 v , rext=390k ~ 510k ohm 8 0 k h z inform ation. http://www.m d tic.com .tw
MDT75C277 otp encoder 4 of 4 2006/ 10/ 11 ver. 1.5 thi s speci fi cat i on i s subject t o be changed wi t hout not i ce. pl ease vi si t our web si t e for t h e m o st updat e d 9. external oscillator resistor selection table (vdd=11v) rext (ohm) freq. (hz) operating current 1.2 m ( max ) 33.9 k 476 a 1 m 36.9 k 482 a 680 k 51.4 k 517 a 620 k 55.0 k 520 a 560 k 59.6 k 523 a 510 k 64.7 k 525 a 470 k 69.2 k 528 a 430 k 73.2 k 532 a 390 k 78.2 k 535 a 360 k 82.3 k 539 a 330 k 88.5 k 545 a 300 k ( min ) 96.2 k 553 a inform ation. http://www.m d tic.com .tw
MDT75C277 otp encoder 5 of 5 2006/ 10/ 11 ver. 1.5 thi s speci fi cat i on i s subject t o be changed wi t hout not i ce. pl ease vi si t our web si t e for t h e m o st updat e d d i ffe re nt r o s c (f & v ) 50.0k 55.0k 60.0k 65.0k 70.0k 75.0k 80.0k 85.0k 90.0k 95.0k 100.0k voltage f (hz) 560k 510k 470k 430k 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 88.9k 84.4k 81.0k 78. 6k 76.2k 74.4k 73.2k 430k 95.8k 91.2k 87.4k 84. 0k 81.6k 79.8k 78.0k 6v 7v 8v 9v 10v 11v 12v rosc = 470k 60.0k 65.0k 70.0k 75.0k 80.0k 85.0k 90.0k 95.0k 100.0k 105.0k 110.0k 115.0k 120.0k 3v 4v 5v 6v 7v 8v 9v 10v 11v 12v - 4 0 j - 2 0 j 0j 25j 50j 80j inform ation. http://www.m d tic.com .tw
MDT75C277 otp encoder 6 of 6 2006/ 10/ 11 ver. 1.5 thi s speci fi cat i on i s subject t o be changed wi t hout not i ce. pl ease vi si t our web si t e for t h e m o st updat e d 10. application circuit ( reference ) 1 2 3 45 6 7 8 vdd vss txd k3 k2 k1 k0 oscr r osc vdd vss transmitter circuit sw0 sw1 sw2 sw3 + 4.7u 0.1u 1m[ r1 (a). if encoder circuit has one switch only to control on/off power & key data together, then circuit m u st 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), inform ation. http://www.m d tic.com .tw
MDT75C277 otp encoder 7 of 7 2006/ 10/ 11 ver. 1.5 thi s speci fi cat i on i s subject t o be changed wi t hout not i ce. pl ease vi si t our web si t e for t h e m o st updat e d txd inform ation. http://www.m d tic.com .tw
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