AT27C512R View Datasheet(PDF) - Atmel Corporation

Part Name

Description

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AT27C512R

512K (64K x 8) OTP EPROM

Atmel Corporation 

AT27C512R

9. AC Characteristics for Read Operation

Symbol

Parameter

Condition

tACC(1)

tCE(1)

tOE(1)

tDF(1)

Address to Output Delay

CE = OE/VPP = VIL

CE to Output Delay

OE/VPP = VIL

OE/VPP to Output Delay

CE = VIL

OE/VPP or CE High to Output Float, Whichever Occurred First

tOH

Output Hold from Address, CE or OE/VPP, Whichever Occurred

First

Note: 1. See AC Waveforms for Read Operation.

10. AC Waveforms for Read Operation(1)

AT27C512R

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

3. OE/VPP 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

0015O–EPROM–12/07

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