MDT75C273
OTP Encoder
1. General Description
The MDT75C273 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
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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.
Automatically enter sleep mode if press button over 6 ~ 10 sec
3. Pin Assignment
MDT75C273P / 75C273S
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 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
1 of 5
2005/6/20 Ver. 1.0
MDT75C273
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
12 Ick
4 Ick
124 Ick for 75C273
C0 ~ C19 ( 1048576 address codes )
D0
D1
D2
D3
6. Key 0 ~ 3 combination table
K3
0
0
0
0
0
0
0
1
K2
0
0
0
1
1
1
1
0
K1
0
1
1
0
0
1
1
0
K0
1
0
1
0
1
0
1
0
D3
0
0
0
1
1
1
1
1
D2
0
0
0
1
1
1
1
1
D1
0
1
1
0
0
1
1
1
D0
1
1
0
0
1
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
2 of 5
2005/6/20 Ver. 1.0
MDT75C273
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 (T
A
=0℃ to 70℃)
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=11V,
Rosc=360K ~ 470K ohm
4.5
4.5
80K
0.5
1.0
mA
mA
mA
HZ
1.0
3.0
uA
Conditions
Min.
3.0
Typ.
5
Max.
12
Unit
V
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
MDT75C273
OTP Encoder
9. Application circuit
Vdd
R OSC
1
2
3
4
OSCR
VDD
VSS
TXD
K3
K2
K1
K0
8
7
6
5
SW3
SW2
SW1
SW0
Vss
Transmit er
Circuit
10. External oscillator resistor selection table (Vdd=11V)
Rosc (ohm)
Freq. (Hz)
Operating Current
443
µA
444
µA
445
µA
447
µA
449
µA
451
µA
510 K
470 K
430 K
390 K
360 K
330 K
70.0 K
74.0 K
78.7 K
84.6 K
88.9 K
97.4 K
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
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