MDT75C277

OTP Encoder

1 of 1

2006/10/11 Ver. 1.5

This specification is subject to be changed without notice. Please visit our web site for the most updated

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

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 freq.

Vdd

Positive power supply 3.0V ~ 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.

information.

http://www.mdtic.com.tw