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M27C256B Datasheet(PDF) 7 Page - STMicroelectronics |
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M27C256B Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 16 page ![]() 7/16 M27C256B Table 9. Programming Mode DC Characteristics (1) (TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12.75V ± 0.25V) Note: VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP. Table 10. Programming Mode AC Characteristics (1) (TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12.75V ± 0.25V Note: VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP. Symbol Parameter Test Condition Min Max Unit ILI Input Leakage Current VIL ≤ VIN ≤ VIH ±10 µA ICC Supply Current 50 mA IPP Program Current E = VIL 50 mA VIL Input Low Voltage –0.3 0.8 V VIH Input High Voltage 2 VCC + 0.5 V VOL Output Low Voltage IOL = 2.1mA 0.4 V VOH Output High Voltage TTL IOH = –1mA 3.6 V VID A9 Voltage 11.5 12.5 V 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 2µs tVCHEL tVCS VCC High to Chip Enable Low 2µs 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 0 ns Programming When delivered (and after each erasure for UV EPROM), all bits of the M27C256B are in the "1" state. Data is introduced by selectively program- ming "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 exposure to ultraviolet light (UV EPROM). The M27C256B is in the pro- gramming mode when VPP input is at 12.75V, G is at VIH and E is pulsed to VIL. The data to be pro- grammed 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 6.25V ± 0.25 V. |
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