ST1200 Datasheet, PDF (1/2 Pages) STMicroelectronics – Memory Card IC 256 bit OTP EPROM with Lock-Out

ST1200
Memory Card IC
256 bit OTP EPROM with Lock-Out
DATA BRIEFING
s 256 x 1 bit Organisation
s 96 bits Protected in Write Mode By Lock-Out
Fuse
s 5 V Power Supply (V_CC) and 21 V Programming
Voltage (V_PP)
s 85 mW in Read Mode
s Power On Reset
s Very High Reliability Level
s Standard Delivery: Wafer Form and
Micromodule Package
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.
Table 1. Signal Names
A
Function code
B
Function code
FUS
Fuse control
OUT
Data Output
Strobe input
ST
- validates function codes
- in programming mode used as a
programming pulse
V_PP
Programming voltage (must be preset
before programming and held after)
V_CC
Power
GND
Ground
Micromodule (D10)
Wafer
Figure 1. Logic Diagram
VCC VPP
ST
A
ST1200
B
GND
OUT
FUS
DS120005
October 1999
1/2
Complete data available under NDA.