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’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
V
PP
V
CC
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 re-
set) after “t
RST
”. (t
RST
is the time for the output to
become available, after the establishment of a val-
id 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
µm
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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