
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 VPP (TEST) 4IPower 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 7IChip Initialization
VDD/VSS VDD/VSS S3P9404: 30 (32) / 1
S3P9414: 24 (24) / 1 ILogic 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
Operating Voltage (VDD)2.7 V to 5.5 V 2.7 V to 5.5 V
OTP Programming Mode VDD = 5 V, VPP (TEST) = 12.5 V
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/MEMMEM ADDRESS
(A15-A0) R/WMODE
5 V 5 V 00000H 1EPROM read
12.5 V 00000H 0EPROM program
12.5 V 00000H 1EPROM verify
12.5 V 10E3FH 0EPROM read protection
NOTE: "0" means Low level; "1" means High level.