
Atmel AT27C512R
Figure 5-1.
AC waveforms for read operation (1)
Notes:
1. Timing measurement reference level is 1.5V for -45 devices. Input AC drive levels are V IL = 0.0V and V IH = 3.0V. Timing
measurement reference levels for all other speed grades are V OL = 0.8V and V OH = 2.0V. Input AC drive levels are
V IL = 0.45V and V IH = 2.4V.
2. OE /V PP may be delayed up to t CE - t OE after the falling edge of CE without impact on t CE .
3. OE /V PP may be delayed up to t ACC - t OE after the address is valid without impact on t ACC .
4. This parameter is only sampled, and is not 100% tested.
5. Output float is defined as the point when data is no longer driven.
Figure 5-2.
Input test waveforms and measurement levels
For -45 devices only:
t R , t F < 5ns (10% to 90%)
For -70 devices:
t R , t F < 20ns (10% to 90%)
Figure 5-3.
Output test load
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