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NM27C256 Datasheet(PDF) 5 Page - Fairchild Semiconductor |
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NM27C256 Datasheet(HTML) 5 Page - Fairchild Semiconductor |
5 / 11 page 5 www.fairchildsemi.com Programming Characteristics (Note 12) (Note 13) (Note 14) (Note 15) (Continued) Symbol Parameter Conditions Min Typ Max Units tAS Address Setup Time 1 µs tOES OE Setup Time 1 µs t VPS V PP Setup Time 1 µs tVCS VCC Setup Time 1 µs tDS Data Setup Time 1 µs tAH Address Hold Time 0 µs tDH Data Hold Time 1 µs t DF Output Enable to Output CE = V IL 060 ns Float Delay tPW Program Pulse Width 45 50 105 µs t OE Data Valid from OE CE = V IL 100 ns IPP VPP Supply Current CE = VIL 30 mA during Programming Pulse I CC V CC Supply Current 50 mA TA Temperature Ambient 20 25 30 °C V CC Power Supply Voltage 6.25 6.5 6.75 V VPP Programming Supply Voltage 12.5 12.75 13.0 V tFR Input Rise, Fall Time 5 ns V IL Input Low Voltage 0.0 0.45 V VIH Input High Voltage 2.4 4.0 V tIN Input Timing Reference Voltage 0.8 2.0 V t OUT Output Timing Reference Voltage 0.8 2.0 V Programming Waveforms (Note 14) Note 12: Fairchild’s standard product warranty applies to devices programmed to specifications described herein. Note 13: VCC must be applied simultaneously or before VPP and removed simultaneously or after VPP. The EPROM must not be inserted into or removed from a board with voltage applied to VPP or VCC. Note 14: The maximum absolute allowable voltage which may be applied to the VPP pin during programming is 14V. Care must be taken when switching the VPP supply to prevent any overshoot from exceeding this 14V maximum specification. At least a 0.1 µF capacitor is required across V PP, VCC to GND to suppress spurious voltage transients which may damage the device. Note 15: During power up the PGM pin must be brought high ( ≥ V IH) either coincident with or before power is applied to VPP. ADDRESS N DATA IN STABLE ADD N DATA OUT VALID ADD N 2.0V 0.8V 2.0V 0.8V 5.25V 12.75V 2.0V 0.8V 2.0V 0.8V ADDRESSES DATA CE VPP VCC OE t OE t OES t PW t VPS t VCS t DS t AS t AH t DF t DH PROGRAM PROGRAM VERIFY DS010833-5 |
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