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M27W256-80K6TR Datenblatt(PDF) 7 Page - STMicroelectronics |
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M27W256-80K6TR Datenblatt(HTML) 7 Page - STMicroelectronics |
7 / 15 page 7/15 M27W256 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 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 0 ns Programming The M27W256 has been designed to be fully com- patible with the M27C256B and has the same electronic signature. As a result the M27W256 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 M27W256 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 exposure to ul- traviolet light (UV EPROM). The M27W256 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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Ähnliche Beschreibung - M27W256-80K6TR |
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