ST1200
Memory Card IC
256 bit OTP EPROM with Lock-Out
DATA BRIEFING
s
s
256 x 1 bit Organisation
96 bits Protected in Write Mode By Lock-Out
Fuse
5 V Power Supply (V
CC
) and 21 V Programming
Voltage (V
PP
)
85 mW in Read Mode
Power On Reset
1
1
1
1
s
s
s
s
s
Very High Reliability Level
Standard Delivery: Wafer Form and
Micromodule Package
Micromodule (D10)
DESCRIPTION
The ST1200 is a 256 bit OTP (one time program-
mable) EPROM, organized as 256 x 1, manufac-
tured using ST鈥檚 highly reliable and well proven
NMOS technology.
The security mechanism, called Lock-Out, allows
the user to inhibit, in write mode, the access to a
memory section of 96 bits. Thus, by blowing a
polysilicon fuse, the address bits 0 to 95 can be
protected against write.
The 9th bit of the ST1200 is set to a logical 鈥?鈥?for
device identification purposes. In order to avoid
any modification, ST has mask-programmed this
bit to the logic 鈥?鈥?state.
Wafer
Figure 1. Logic Diagram
VCC
VPP
Table 1. Signal Names
A
B
FUS
OUT
Function code
Function code
Fuse control
Data Output
Strobe input
- validates function codes
- in programming mode used as a
programming pulse
Programming voltage (must be preset
before programming and held after)
Power
Ground
ST
A
B
ST1200
OUT
ST
FUS
V
PP
V
CC
GND
GND
DS120005
October 1999
Complete data available under NDA.
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STMICROELECTRONICS
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