S3C9404/P9404/C9414/P9414

S3P9404/P9414 OTP

15-5

Table 15-1. Descriptions of Pins Used to Read/Write the EPROM

Main Chip

During Programming

Pin Name

Pin Name

Pin No.

I/O

Function

P0.3

SDAT

S3P9404: 28 (30)

S3P9414: 22 (22)

I/O

Serial data pin (output when reading, Input

when writing) Input and push-pull output

port can be assigned

P0.2

SCLK

S3P9404: 29 (31)

S3P9414: 23 (23)

I/O

Serial clock pin (input only pin)

TEST

V

4

I

Power supply pin for EPROM cell writing

(indicates that OTP enters into the writing mode).

When 12.5 V is applied, OTP is in writing mode

and when 5 V is applied, OTP is in reading

mode. (Option)

RESET

RESET

7

I

Chip Initialization

V

V

S3P9404: 30 (32) / 1

S3P9414: 24 (24) / 1

I

Logic power supply pin.

NOTE: ( ) means the SOP OTP pin number.

Table 15-2. Comparison of S3P9404/P9414and S3C9404/C9414 Features

Characteristic

S3P9404/P9414

S3C9404/C9414

Program Memory

4-Kbyte EPROM

4-Kbyte mask ROM

2.7 V to 5.5 V

2.7 V to 5.5 V

OTP Programming Mode

Pin Configuration

30 SDIP/32 SOP/24 SDIP/24 SOP

EPROM Programmability

User Program 1 time

Programmed at the factory

OPERATING MODE CHARACTERISTICS

When 12.5 V is supplied to the VPP (TEST) pin of the S3P9404/P9414, the EPROM programming mode is

entered. The operating mode (read, write, or read protection) is selected according to the input signals to the pins

listed in Table 15-3 below.

Table 15-3. Operating Mode Selection Criteria

VDD

VPP

(TEST)

REG/

MEM

MEM

ADDRESS

(A15-A0)

R/W

MODE

5 V

5 V

0

0000H

1

EPROM read

12.5 V

0

0000H

0

EPROM program

12.5 V

0

0000H

1

EPROM verify

12.5 V

1

0E3FH

0

EPROM read protection

NOTE: "0" means Low level; "1" means High level.