MDT75C275
OTP Encoder
1. General Description
The MDT75C275 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.
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.
No Sleep mode
3. Pin Assignment
MDT75C275P / 75C275S
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
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
P.1
2007/5 Ver. 1.0
MDT75C275
OTP Encoder
5.Output Data Reporting
Output data frame
Preamble
C0 ~ C19 ( 1048576 address codes )
D0
D1
D2
D3
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.
http://www.mdtic.com.tw
P.2
2007/5 Ver. 1.0
MDT75C275
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
Vdd =12V
Vdd =12V, Voh = 6V
Vdd =12V, Vol = 6V
Vdd=11V,
Rext=360K ~ 430K ohm
4.5
4.5
80K
Conditions
Min.
3.0
Typ.
8
1.0
0.5
Max.
12
3.0
1.0
Unit
V
uA
mA
mA
mA
HZ
Iop
Ioh
Iol
Fop
Operating current
Source current
Sink Current
Operating Freq
9. External oscillator resistor selection table ( Reference )
390 K ohm
HZ
13 V
12 V
11 V
10 V
9V
8V
7V
6.5 V
80.8 K
82.5 K
83.8 K
85.6 K
88.4 K
90.9 K
88.9 K
85.1 K
current
338µA
260µA
203µA
162µA
117µA
80µA
50µA
38µA
430 K ohm
HZ
72.7 K
73.8 K
75.0 K
77.4 K
78.7 K
81.4 K
80.7 K
77.4 K
current
323µA
252µA
195µA
150µA
113µA
77µA
48µA
36µA
470 K ohm
HZ
67.8 K
69.0 K
69.9 K
71.7 K
73.7 K
76.5 K
75.5 K
72.7 K
current
315µA
248µA
195µA
150µA
113µA
77µA
48µA
35µA
Voltage\Rosc
This specification is subject to be changed without notice. Please visit our web site for the most updated
information.
http://www.mdtic.com.tw
P.3
2007/5 Ver. 1.0
MDT75C275
OTP Encoder
Voltage\Rosc
6V
5V
4.5 V
4V
3.3 V
3V
2.7 V
2.5 V
390 K ohm
HZ
56.7 K
50.3 K
46.4 K
41.2 K
27.4 K
22.2 K
16.6 K
12.7 K
current
26µA
14µA
11µA
8µA
6µA
5µA
5µA
3µA
430 K ohm
HZ
52.5 K
45.1 K
41.0 K
37.6 K
25.0 K
19.8 K
14.8 K
11.6 K
current
25µA
14µA
11µA
8µA
6µA
5µA
5µA
3µA
470 K ohm
HZ
49.4 K
42.1 K
39.0 K
35.2 K
23.9 K
19.0 K
14.2 K
11.0 K
current
24µA
14µA
11µA
8µA
6µA
5µA
5µA
3µA
10. Application circuit (
Reference
)
Vdd
R
OSC
1
2
3
OSCR
VDD
VSS
TXD
K3
K2
K1
K0
8
7
6
5
SW3
SW2
SW1
SW0
+
4.7u
0.1u
R1
1MΩ
4
Vss
Transmitter
Circuit
This specification is subject to be changed without notice. Please visit our web site for the most updated
information.
http://www.mdtic.com.tw
P.4
2007/5 Ver. 1.0
MDT75C275
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
information.
http://www.mdtic.com.tw
P.5
2007/5 Ver. 1.0
