S3C70F2/C70F4/P70F4

S3P70F4 OTP

16-3

Table 16-1. Descriptions of Pins Used to Read/Write the EPROM

Main Chip

During Programming

Pin Name

Pin Name

Pin No.

I/O

Function

P6.2

SDAT

28 (30)

I/O

Serial data pin. Output port when reading and input

port when writing. Can be assigned as a Input /

push-pull output port.

P6.3

SCLK

29 (31)

I/O

Serial clock pin. Input only pin.

TEST

V

4 (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 (7)

I

Chip initialization

V

V

30/1 (32/1)

I

during programming.

NOTE: ( ) means the 32-SOP OTP pin number.

Table 16-2. Comparison of S3P70F4 and S3C70F2/C70F4 Features

Characteristic

S3P70F4

S3C70F2/C70F4

Program Memory

4 K-byte EPROM

2 K-byte mask ROM: S3C70F2

4 K-byte mask ROM: S3C70F4

Operating Voltage (V

2.0 V to 5.5 V

1.8 V to 5.5V

OTP Programming Mode

V

–

Pin Configuration

30 SDIP, 32 SOP

30 SDIP, 32 SOP

EPROM Programmability

User Program one time

Programmed at the factory

OPERATING MODE CHARACTERISTICS

When 12.5 V is supplied to the V

operating mode (read, write, or read protection) is selected according to the input signals to the pins listed in

Table 16–3 below.

Table 16-3. Operating Mode Selection Criteria

V

DD

V

REG/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.