M27256-20F1 SGS-Thomson-Microelectronics, M27256-20F1 Datasheet
M27256-20F1
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M27256-20F1 Summary of contents
Page 1
... The M27256 is a 262,144 bit UV erasable and electrically programmable memory EPROM organized as 32.768 words by 8 bits. The M27256 is housed pin Window Ceramic Frit-Seal Dual-in-Line package. The transparent lid 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 ...
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... Q7 The M27256 has a standby mode which reduces 18 Q6 the maximum active power current from 100mA 40mA. The M27256 is placed in the standby mode applying a TTL high signal to the E input. When the standby mode, the outputs are in a high impedance state, independent of the G input. ...
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... PCB traces. Programmain When delivered, (and after each erasure for UV EPROM), all bits of the M27256 are in the “1" state. Data is introduced by selectively programming ”0s" into the desired bit locations. Although only “0s” will be programmed, both “1s” and “0s” can be present in the data word. The only way to change a “ ...
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... M27256 AC MEASUREMENT CONDITIONS Input Rise and Fall Times Input Pulse Voltages Input and Output Timing Ref. Voltages Note that Output Hi-Z is defined as the point where data is no longer driven. Figure 3. AC Testing Input Output Waveforms 2.4V 0.45V (1) Table 5. Capacitance (T A Symbol Parameter C Input Capacitance ...
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... Max 200 250 200 250 75 100 M27256 -4 Max Min Max 300 450 300 450 120 150 105 0 130 105 0 130 M27256 Unit Unit Unit 5/10 ...
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... M27256 Table 8. Programming Mode DC Characteristics ( 0.25V Symbol Parameter I Input Leakage Current LI I Supply Current CC I Program Current PP V Input Low Voltage IL V Input High Voltage IH V Output Low Voltage OL V Output High Voltage Voltage ID Note must be applied simultaneously with or before V CC Table 9 ...
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... Programming of multiple M27256s in parallel with different data is also easily accomplished. Except ++ Addr for E, all like inputs (including G) of the parallel M27256 may be common. A TTL low pulse applied to a M27256’s E input, with V program that M27256. A high level E input inhibits the other M27256s from being programmed. ...
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... Research shows that constant exposure to room level fluorescent lighting could erase a typical M27256 in about 3 years, while it would take approximately 1 week to cause erasure when exposed to direct sunlight. If the M27256 exposed to these types of lighting conditions ...
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... inches Typ Min 0.225 0.020 0.070 0.154 0.200 0.016 0.022 0.046 0.056 0.009 0.012 1.500 0.606 0.622 0.514 0.526 0.100 – 1.300 – 0.637 0.721 0.125 0.161 0.060 0.098 0.280 – FDIPW-a M27256 Max – – – 15 9/10 ...
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... M27256 Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice ...