Datenblatt-Suchmaschine für elektronische Bauteile |
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M2716 Datenblatt(PDF) 3 Page - STMicroelectronics |
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M2716 Datenblatt(HTML) 3 Page - STMicroelectronics |
3 / 9 page pulse width between 45ms and 55ms. Multiple pulses are not needed but will not cause device damage. No pins should be left open. A high level (VIH or higher) must not be maintained longer than tPHPL (max) on the program pin during program- ming. M2716’s may be programmed in parallel in this mode. Program Verify Mode. The programming of the M2716 may be verified either one byte at a time during the programming (as shown in Figure 6) or by reading all of the bytes out at the end of the programming sequence. This can be done with VPP = 25V or 5V in either case. VPP must be at 5V for all operating modes and can be maintained at 25V for all programming modes. Program Inhibit Mode. The program inhibit mode allows several M2716’s to be programmed simul- taneously with different data for each one by con- trolling which ones receive the program pulse. All similar inputs of the M2716 may be paralleled. Pulsing the program pin (from VIL to VIH) will pro- gram a unit while inhibiting the program pulse to a unit will keep it from being programmed and keep- ing G = VIH will put its outputs in the Hi-Z state. ERASURE OPERATION The M2716 is erased by exposure to high intensity ultraviolet light through the transparent window. This exposure discharges the floating gate to its initial state through induced photo current. It is recommended that the M2716 be kept out of direct sunlight. The UV content of sunlight may cause a partial erasure of some bits in a relatively short period of time. An ultraviolet source of 2537 Å yielding a total integrated dosage of 15 watt-seconds/cm2 power rating is used. The M2716 to be erased should be placed 1 inch away from the lamp and no filters should be used. An erasure system should be calibrated peri- odically. The erasure time is increased by the square of the distance (if the distance is doubled the erasure time goes up by a factor of 4). Lamps lose intensity as they age, it is therefore important to periodically check that the UV system is in good order. This will ensure that the EPROMs are being com- pletely erased. Incomplete erasure will cause symptoms that can be misleading. Programmers, components, and system designs have been erro- neously suspected when incomplete erasure was the basic problem. DEVICE OPERATION (cont’d) Mode EP GVPP Q0 - Q7 Read VIL VIL VCC Data Out Program VIH Pulse VIH VPP Data In Verify VIL VIL VPP or VCC Data Out Program Inhibit VIL VIH VPP Hi-Z Deselect X VIH VCC Hi-Z Standby VIH XVCC Hi-Z Note: X = VIH or VIL. Table 3. Operating Modes 3/9 M2716 |
Ähnliche Teilenummer - M2716 |
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Ähnliche Beschreibung - M2716 |
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