ETC MDT75C271

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
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CMOS technology.
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Low standby current : 1.0 uA.
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Wide range of Operating Voltage : Vdd = 4.5V ~ 12V.
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Up to 4 data pins.
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Total 1048576 address codes.
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Built-in RC oscillator with single external resistor.
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Available in DIP and SOP package.
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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
I/O
OSCR
I
Function Description
Connect a resistor to Vdd to adjust internal RC freq.
Vdd
Positive power supply 4.5V ~ 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.
1 of 5
2005/1/6 Ver. 1.2
MDT75C271
OTP Encoder
5.Output Data Reporting
Output data frame
Preamble
C0 ~ C19 ( 1048576 address codes )
D0
D1
D2
D3
Preamble :
4 Ick
124 Ick for 75C271
Data High :
12 Ick
4 Ick
Data Low :
4 Ick
12 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
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
Parameter
Vdd
Conditions
Rating
Unit
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 (TA=0℃ to 70℃)
Symbol
Parameters
Vdd
Operating Voltage
Isb
Stand by current
Conditions
Min.
Typ.
Max.
Unit
4.5
5
12
V
1.0
3.0
uA
0.5
1.0
mA
Vdd = 12V, OSC stop
K0 ~ K3 = Low
Output Unloaded
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 =12V
Vdd=10V, Rext=390K ohm
80K
HZ
9. External oscillator resistor selection table (Vdd=11V)
Rext (ohm)
Freq. (Hz)
Operating Current
510 K
65.0 K
443 µA
470 K
65.0 K
444 µA
430 K
72.7 K
445 µA
390 K
79.6 K
447 µA
360 K
82.9 K
449 µA
330 K
90.4 K
451 µA
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
8
SW3
7
SW2
6
SW1
5
SW0
K3
2
VDD
K2
VSS
K1
TXD
K0
3
4
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