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M87C257-12XC3X Datasheet(PDF) 7 Page - STMicroelectronics |
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M87C257-12XC3X Datasheet(HTML) 7 Page - STMicroelectronics |
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7 / 13 page  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 VCC -0.8V V VID A9 Voltage 11.5 12.5 V Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP. Table 9. Programming Mode DC Characteristics (1) (TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12.75V ± 0.25V) 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 0 ns Note: 1. 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) Programming When delivered (and after each erasure for UV EPROM), all bits of the M87C257 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 exposition to ultra- violet light (UV EPROM). The M87C257 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 ad- dress and data inputs are TTL. VCC is specified to be 6.25 V ± 0.25 V. 7/13 M87C257 |
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