HT6P20 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT6P20

224 OTP Encoder

Holtek Semiconductor 

Functional Description

Programming

The HT6P20 is a one time programmable encod-

ing integrated circuit. The programmable codes

consist of 4-bit control codes and 24-bit address

codes. Before using the device, first program the

internal 4 control bits and 24 address bits. Then,

to program the address and control codes, con-

nect the PGM pin to VSS, allowing the SIO pin to

receive control and address codes from the con-

tinuously transmitting programming kit. The

control codes (B0~B3) and address timing are re-

spectively shown on the Table and the Figure for

Programming Timing. In the programming pro-

cess, the mode bit (B0) has to be programmed

first. The 0/2/4/8 data number is selected by the

address along with the data format bits (B1,B2).

The HT6P20, in addition, provides a polarity bit

(B3) to select the polarity of the output data.

Various packages of the HT6P20 offer program-

mable combinations of address/data to meet

various application needs.

B0 B1 B2 B3

P o la r ity c o n tr o l

A d d re s s a n d d a ta fo rm a t

M o d e c o n tro l

HT6P20

Table 1: Control code

· Mode control (B0)

B0

Function

0

Not programmed

1

Programmed

· Address and data format (B1,B2)

B2 B1

Code Format

0

0 A0~A23

0

1 A0~A21 + D1~D0

1

0 A0~A19 + D3~D0

1

1 A0~A15 + D7~D0

· Polarity control (B3)

B3

Data Output Polarity

0

Negative polarity

1

Positive polarity

The HT6P20A/D can be programmed by the

SIO pins. The HT6P20B, on the other hand, is

programmed for 2-data and positive polarity

application.

Programming timing of the HT6P20D (B0~B3=1010)

O SC2

(3 k H z )

PG M

S IO

1 10 100100

1 0XXX X

P r o g r a m m in g

b it

C B0 B1 B2 B3 A0 A1 A2 A3

A 18 A 19 A 20 A 21 A 22 A 23

P r o g r a m m in g

N o te : (1 ) B 0 ~ B 3 a re c o n tro l c o d e s

(2 ) A 0 ~ A 2 3 a re a d d re s s c o d e s

( 3 ) A 2 0 ~ A 2 3 s ta n d s fo r d o n 't c a r e fo r th e H T 6 P 2 0 D

( 4 ) S IO m u s t b e s e t to " H ig h " d u r in g C a n d B 0 p e r io d s

( 5 ) 0 : " L o w " ; 1 : " H ig h " ; X : D o n 't c a r e

Programming timing for the HT6P20D

5

May 2, 2000

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