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PY264-55WM Datasheet(PDF) 4 Page - Pyramid Semiconductor Corporation |
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PY264-55WM Datasheet(HTML) 4 Page - Pyramid Semiconductor Corporation |
4 / 8 page PY264 Page 4 of 8 Document # EPROM102 REV OR DEVICE ERASURE If the device is subjected to wavelengths of light below 4000 Angstroms, device erasure will commence. It is therefore recommended to use an opaque label over the window in the event the device will be exposed to lighting for a long time. The UV dose for erasure requires a wavelength of 2,537 Angstroms for a minimum dose of 25 Wsec/cm2. If using a UV lamp of 12 mW/cm2, the exposure time is estimated to be 35 minutes. Devices should be positioned within 1 inch of the lamp during the erasure process. Permanent damage can occur to the devices if exposed to UV light for an extended period of time. MODE SELECTION PROGRAMMING PINOUTS Read or Output Disable A12 A11 A10 A9 A8 CS O7-O0 Program NA Vpp LATCH PGM VFY CS D7-D0 A12 A11 A10 A9 A8 VIL O7-O0 A12 A11 A10 A9 A8 VIH High Z VILP Vpp VILP VILP VIHP VILP D7-D0 VILP Vpp VILP VIHP VIHP VILP High Z VILP Vpp VILP VIHP VILP VILP O7-O0 VILP Vpp VILP VIHP VILP VILP O7-O0 Pin Function Program Verify Blank Check Program Program Inhibit Mode Read Output Disable READ MODE Reading the addressed content is the normal operating mode for a programmed device. Signals are at normal TTL levels. Addressing is applied to the 13 address pins and CS is LOW. Under these conditions, the addressed location contents are presented to the output pins. |
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