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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 (VCC) and 21 V Programming Voltage (VPP) 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 programmable) EPROM, organized as 256 x 1, manufactured using ST's 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 "1" for device identification purposes. In order to avoid any modification, ST has mask-programmed this bit to the logic "1" 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
VPP VCC
GND
GND
DS120005
October 1999
Complete data available under NDA.
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ST1200
The ST1200 is available in wafer form (either sawn or unsawn) and in micromodule form (on film). For deliveries in wafer form, the memory content is at logical "0", except for the 9th bit (bit 8). If the delivery is in micromodule, the first bit (bit 0) has been programmed at "1" for final test control. FUNCTIONAL DESCRIPTION The ST1200 has 3 operating modes in the normal system environment. They are selected with the A and B inputs, as shown in Table 2. Power-On Reset Because of the "power-on reset" feature, the ST1200 is ready for operation (with the counter reset) after "tRST". (tRST is the time for the output to become available, after the establishment of a valid level on V CC). The ST1200 starts by presenting the current cell (address 0) to the OUT pin. Figure 2. Memory Map
00 0 1*
08 1
PROTECTED ZONE 96
NON PROTECTED ZONE
255 1* : Only for deliveries in micromodules
SCP083/AI
Table 2. Operating Modes
A 0 0 1 1 B 0 1 1 0 Mode Reset address counter Increment address counter Program memory cell Forbidden
Table 3. Ordering Information Scheme
Example: ST1200 D10
Delivery Form D10 B5 Micromodule on Super 35 mm reel Wafer (280 m thickness)
Devices are shipped from the factory with the memory content set at all `0's (00h). For a list of available options (speed, package, etc...) or for further information on any aspect of this device, please contact the ST Sales Office nearest to you.
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