AT28C64B-20SI datasheet(5/13 Pages) ATMEL

Part #	AT28C64B-20SI

Description	64K (8K x 8) Parallel EEPROM with Page Write and Software Data Protection

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Manufacturer	ATMEL [ATMEL Corporation]

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AT28C64B

5

AC Read Waveforms

(1)(2)(3)(4)

Notes:

1. CE may be delayed up to t

ACC - tCE after the address transition without impact on tACC.

2. OE may be delayed up to t

CE - tOE after the falling edge of CE without impact on tCE or by tACC - tOE after an address change

without impact on tACC.

3. t

DF is specified from OE or CE whichever occurs first (CL = 5 pF).

4. This parameter is characterized and is not 100% tested.

Input Test Waveforms and

Measurement Level

Output Test Load

Note:

1. This parameter is characterized and is not 100% tested.

AC Read Characteristics

Symbol

Parameter

AT28C64B-15

AT28C64B-20

AT28C64B-25

Units

Min

Max

Min

Max

Min

Max

t

ACC

Address to Output Delay

150

200

250

ns

tCE

(1)

CE to Output Delay

150

200

250

ns

t

OE

(2)

OE to Output Delay

0

70

0

80

0

100

ns

t

DF

(3)(4)

CE or OE to Output Float

0

50

0

55

0

60

ns

t

OH

Output Hold from OE, CE or

Address, whichever occurred first

00

0

ns

t

R, tF < 5 ns

Pin Capacitance

f = 1 MHz, T = 25°C

(1)

Symbol

Typ

Max

Units

Conditions

C

IN

46

pF

V

IN = 0V

COUT

812

pF

VOUT = 0V

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