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M87C257-60XF3TR Datasheet(PDF) 5 Page - STMicroelectronics |
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M87C257-60XF3TR Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 22 page M87C257 Description 5/22 1 Description The M87C257 is a 256 Kbit EPROM offered in the two ranges UV (ultra violet erase) and OTP (one time programmable). It incorporates latches for all address inputs to minimize chip count, reduce cost, and simplify the design of multiplexed bus systems and is organized as 32,768 by 8 bits. The FDIP28W (window ceramic frit-seal package) has a transparent lid which allows the user to expose the chip to ultraviolet light to erase the bit pattern. A new pattern can then be written to the device by following the programming procedure. For applications where the content is programmed only one time and erasure is not required, the M87C257 is offered in PLCC32 package. In order to meet environmental requirements, ST offers the M87C257 in ECOPACK® packages. ECOPACK packages are Lead-free. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. Figure 1. Logic diagram AI00928B 15 A0-A14 ASVPP Q0-Q7 VCC M87C257 G E VSS 8 |
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