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AT28HC64B

64K 8K x 8 High Speed CMOS E2PROM with Page Write and Software Data Protection

Atmel Corporation 

AT28HC64B

AC Read Characteristics

AT28HC64B-55 AT28HC64B-70 AT28HC64B-90 AT28HC64B-120

Symbol Parameter

Min

Max

Min

Max

Min

Max

Min

Max Units

tACC

Address to Output Delay

55

70

90

120 ns

tCE (1)

tOE (2)

CE to Output Delay

OE to Output Delay

55

70

90

120

ns

0

30

0

35

0

40

0

50

ns

tDF (3, 4) OE to Output Float

0

30

0

35

0

40

0

50

ns

tOH

Output Hold

0

0

0

0

ns

AC Read Waveforms (1, 2, 3, 4)

Notes: 1. CE may be delayed up to tACC - tCE after the address

transition without impact on tACC.

2. OE may be delayed up to tCE - tOE after the falling

edge of CE without impact on tCE or by tACC - tOE

after an address change without impact on tACC.

3. tDF 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

tR, tF < 5ns

Pin Capacitance (f = 1 MHz, T = 25°C) (1)

Typ

Max

CIN

4

6

COUT

8

12

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

Units

pF

pF

Conditions

VIN = 0V

VOUT = 0V

2-271

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