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M87C257 Datasheet(PDF) 17 Page - STMicroelectronics |
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M87C257 Datasheet(HTML) 17 Page - STMicroelectronics |
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17 / 22 page  M87C257 DC and AC parameters 17/22 Figure 8. Programming and Verify modes AC waveforms Table 11. Programming mode AC characteristics(1) (2) 1. TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12.75V ± 0.25V 2. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP. Symbol Alt Parameter Test Condition Min Max Unit tAVEL tAS Address Valid to Chip Enable Low 2 µs tQVEL tDS Input Valid to Chip Enable Low 2 µs tVPHEL tVPS VPP High to Chip Enable Low 2 µs tVCHEL tVCS VCC High to Chip Enable Low 2 µs tELEH tPW Chip Enable Program Pulse Width 95 105 µs tEHQX tDH Chip Enable High to Input Transition 2 µs tQXGL tOES Input Transition to Output Enable Low 2 µs tGLQV tOE Output Enable Low to Output Valid 100 ns tGHQZ tDFP Output Enable High to Output Hi-Z 0 130 ns tGHAX tAH Output Enable High to Address Transition 0ns tAVEL VALID AI00557 A0-A14 Q0-Q7 ASVPP VCC G DATA IN DATA OUT E tQVEL tVPHEL tVCHEL tEHQX tELEH tGLQV tQXGL tGHQZ tGHAX PROGRAM VERIFY |
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