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M27W400-100XK6TR 데이터시트(PDF) 8 Page - STMicroelectronics |
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M27W400-100XK6TR 데이터시트(HTML) 8 Page - STMicroelectronics |
8 / 15 page M27W400 8/15 Figure 7. BYTE Transition AC Waveforms Note: Chip Enable (E) and Output Enable (G) = VIL. AI01638B tAXQX tBHQV A0-A17 BYTEVPP tAVQV tBLQX tBLQZ VALID Hi-Z A–1 DATA OUT DATA OUT VALID Q0-Q7 Q8-Q15 Table 9. Programming Mode DC Characteristics (1) (TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12.5V ± 0.25V) Note: 1. 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 0 ≤ VIN ≤ VCC ±1 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 2.4 VCC + 0.5 V VOL Output Low Voltage IOL = 2.1mA 0.4 V VOH Output High Voltage TTL IOH = –2.5mA 3.5 V VID A9 Voltage 11.5 12.5 V Programming When delivered (and after each erasure for UV EPROM), all bits of the M27W400 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 ultravio- let light (UV EPROM). The M27W400 is in the pro- gramming mode when VPP input is at 12.5V, G is at VIH and E is pulsed to VIL. The data to be pro- grammed is applied to 16 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 ± 0.25V. |
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