st62t65b STMicroelectronics, st62t65b Datasheet - Page 72

• Manufacturer Part Number: st62t65b
• Description: 8-bit Otp/eprom Mcus With A/d Converter, Auto-reload Timer, Eeprom And Spi
• Manufacturer: STMicroelectronics

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ST6255B ST6265B
1 GENERAL DESCRIPTION
1.1 INTRODUCTION
The ST6255B and ST6265B is mask programmed
ROM version of ST62T55B and ST62T65B OTP
devices.
They offer the same functionality as OTP devices,
selecting as ROM options the options defined in
the programmable option byte of the OTP version.
Figure 1. Programming wave form
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4mA typ
1 4V typ
100mA
TES T
TES T
max
1 0
15
5
100 s max
150 s typ
0 .5s m in
VR02001
t
t
1.2 ROM READOUT PROTECTION
If the ROM READOUT PROTECTION option is
selected, a protection fuse can be blown to pre-
vent any access to the program memory content.
In case the user wants to blow this fuse, high volt-
age must be applied on the TEST pin.
Figure 2. Programming Circuit
Note: ZPD15 is used for overvoltage protection
TE S T
V
V
DD
S S
5V
100nF
47 F
100nF
m
ZP D15
15V
P ROTE CT
VR02003
14V