mdt75c27 4 otp enc oder this specification is subject to be changed without notice. please visit our web site for the most updated information. http://www.mdtic.com.tw 1 of 5 2005 / 6 / 20 ver. 1.0 1. general description the mdt 75c274 is a n 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 cmos technology. l low standby current : 1 .0 ua. l w ide range of operating voltage : vdd = 3.0 v ~ 12v . l up to 4 data pins. l total 1048576 address codes. l built - in rc oscillator with s ingle external resistor . l available in dip and sop package. l auto matically enter sleep mode if p ress button over 6 ~ 10 sec 3. pi n assignment mdt 75c274 p / 75c274 s 8 pin dip / sop oscr 1 8 k3 vdd 2 7 k2 vss 3 6 k1 txd 4 5 k0 4. pin function description symbol i/o function description oscr i connect a resistor to vdd to adjust internal rc fr eq. vdd positive power supply 3.0 v ~ 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. k 3 i data input with pull low resistor.
mdt75c27 4 otp enc oder this specification is subject to be changed without notice. please visit our web site for the most updated information. http://www.mdtic.com.tw 2 of 5 2005 / 6 / 20 ver. 1.0 5.outpu t data reporting output data frame preamble c0 ~ c19 ( 1048576 address codes ) d0 d1 d2 d3 preamble : 4 ick 636 ick for 75c274 data high : 12 ick 4 ick data low : 4 ick 12 ic k note : 1 ick = 8 osc clock s 6. key 0 ~ 3 combination table k3 k2 k1 k0 d3 d2 d1 d0 0 0 0 1 0 0 0 1 0 0 1 0 0 0 1 1 0 0 1 1 0 0 1 0 0 1 0 0 1 1 0 0 0 1 0 1 1 1 0 1 0 1 1 0 1 1 1 1 0 1 1 1 1 1 1 0 1 0 0 0 1 1 1 1
mdt75c27 4 otp enc oder this specification is subject to be changed without notice. please visit our web site for the most updated information. http://www.mdtic.com.tw 3 of 5 2005 / 6 / 20 ver. 1.0 7. absolu te maximum rating symbol parameter conditions rating unit 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 ) symbol parameters conditions min. typ. max. unit vdd operating voltage 3.0 5 12 v isb stand by current vdd = 12v, osc stop k0 ~ k3 = low output unloaded 1.0 3.0 ua iop operating cur rent vdd =12v 0.5 1.0 ma ioh source current vdd =12v, voh = 6v 4.5 ma iol sink current vdd =12v, vol = 6v 4.5 ma fop operating freq vdd=1 1 v, rosc = 3 6 0k ~ 4 7 0k ohm 80 k hz
mdt75c27 4 otp enc oder this specification is subject to be changed without notice. please visit our web site for the most updated information. http://www.mdtic.com.tw 4 of 5 2005 / 6 / 20 ver. 1.0 1 2 3 4 5 6 7 8 vdd vss txd k3 k2 k1 k0 oscr r osc vdd vss transmitter circuit sw0 sw1 sw2 sw3 9 . application circuit 10 . external oscillator resistor selection table (vdd=11v) rosc (ohm) freq . (hz) operating current 510 k 70 .0 k 443 m a 470 k 74 .0 k 444 m a 430 k 7 8 .7 k 445 m a 390 k 8 4 .6 k 447 m a 360 k 8 8 .9 k 449 m a 330 k 9 7 .4 k 451 m a
mdt75c27 4 otp enc oder this specification is subject to be changed without notice. please visit our web site for the most updated information. http://www.mdtic.com.tw 5 of 5 2005 / 6 / 20 ver. 1.0 txd
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