AT27C256 데이터 시트보기 (PDF) - Atmel Corporation

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AT27C256

256K (32K x 8) One-time Programmable, Read-only Memory

Atmel Corporation 

Figure 5-1. AC waveforms for read operation(1)

Atmel AT27C256R

Notes:

1. Timing measurement reference level is 1.5V for -45 devices. Input AC drive levels are VIL = 0.0V and VIH = 3.0V. Timing

measurement reference levels for all other speed grades are VOL = 0.8V and VOH = 2.0V. Input AC drive levels are VIL =

0.45V and VIH = 2.4V.

2. OE may be delayed up to tCE - tOE after the falling edge of CE without impact on tCE.

3. OE may be delayed up to tACC - tOE after the address is valid without impact on tACC.

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:

tR, tF < 5ns (10% to 90%)

For -70 devices:

tR, tF < 20ns (10% to 90%)

5

0014O–EPROM–10/11

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