AT27C256R-70RA Просмотр технического описания (PDF) - Atmel Corporation

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AT27C256R-70RA

256K (32K x 8) OTP EPROM

Atmel Corporation 

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9. AC Characteristics for Read Operation

Symbol

tACC(1)

tCE(1)

tOE(1)

tDF(1)

Parameter

Address to Output Delay

CE to Output Delay

OE to Output Delay

OE or CE High to Output

Float, Whichever Occurred First

Condition

CE = OE = VIL

OE = VIL

CE = VIL

tOH

Output Hold from Address, CE or OE,

Whichever Occurred First

Note: 1. See AC Waveforms for Read Operation.

10. AC Waveforms for Read Operation(1)

AT27C256R

AT27C256R

-45

-70

Min

Max

Min

Max

45

70

45

70

20

30

20

25

7

7

Units

ns

ns

ns

ns

ns

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 mea-

surement 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.

5

0014M–EPROM–12/07

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