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M27V256 데이터시트(PDF) 6 Page - STMicroelectronics |
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M27V256 데이터시트(HTML) 6 Page - STMicroelectronics |
6 / 15 page M27V256 6/15 Figure 5. Read Mode AC Waveforms AI00758B tAXQX tEHQZ A0-A14 E G Q0-Q7 tAVQV tGHQZ tGLQV tELQV VALID Hi-Z VALID Table 8B. Read Mode AC Characteristics (1) (TA = 0 to 70°C or –40 to 85 °C; VCC = 3.3V ± 10%; VPP = Vcc) Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP. 2. Sampled only, not 100% tested. Symbol Alt Parameter Test Condition M27V256 Unit -120 -150 -200 Min Max Min Max Min Max tAVQV tACC Address Valid to Output Valid E= VIL,G = VIL 120 150 200 ns tELQV tCE Chip Enable Low to Output Valid G= VIL 120 150 200 ns tGLQV tOE Output Enable Low to Output Valid E=VIL 45 50 60 ns tEHQZ (2) tDF Chip Enable High to Output Hi-Z G= VIL 035 0 40 050 ns tGHQZ (2) tDF Output Enable High to Output Hi-Z E=VIL 035 0 40 050 ns tAXQX tOH Address Transition to Output Transition E = VIL, G = VIL 0 0 0 ns Programming The M27V256 has been designed to be fully com- patible with the M27C256B and has the same electronic signature. As a result the M27V256 can be programmed as the M27C256B on the same programming equipments applying 12.75V on VPP and 6.25V on VCC by the use of the same PRES- TO II algorithm. When delivered (and after each erasure for UV EPROM), all bits of the M27V256 are in the ’1’ state. Data is introduced by selective- ly programming ’0’s into the desired bit locations. Although only ’0’s will be programmed, both ’1’s and ’0’s can be present in the data word. The only way to change a ’0’ to a ’1’ is by die exposition to ultraviolet light (UV EPROM). The M27V256 is in the programming mode when VPP input is at 12.75V, G is at VIH and E is pulsed to VIL. The data to be programmed is applied to 8 bits in parallel to the data output pins. The levels required for the address and data inputs are TTL. VCC is specified to be 6.25 V ± 0.25 V. |
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