ST6208C/ST6209C/ST6210C/ST6220C
11.6.2 ROM VERSION
ROM Readout Protection. If the ROM READOUT
PROTECTION option is selected, a protection
fuse can be blown to prevent any access to the
program memory content.
The ST6208C, 09C, 10C and 20C are mask pro-
grammed ROM version of ST62T08C, T09C,
T10C and T20C OTP devices.
In case the user wants to blow this fuse, high volt-
age must be applied on the VPP pin.
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 82. Programming wave form
Figure 81. Programming Circuit
0.5s min
V
PP
100 µs max
5V
4.7µF
15
14V typ
10
100nF
5
V
V
DD
SS
V
PP
150 µs typ
PROTECT
14V
V
400mA
max
PP
100nF
ZPD15
15V
4mA typ
t
VR02001
VR02003
Note: ZPD15 is used for overvoltage protection
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