© 1996 Microchip Technology Inc.

DS11109H-page 3

28C64A

TABLE 1-3:

READ OPERATION AC CHARACTERISTICS

FIGURE 1-1:

READ WAVEFORMS

AC Testing Waveform:

Output Load:

1 TTL Load + 100 pF

Input Rise and Fall Times:

20 ns

Ambient Temperature:

Commercial (C):

Tamb

=

0˚C to +70˚C

Industrial

(I):

Tamb

=

-40˚C to +85˚C

Parameter

Symbol

28C64A

-15

28C64A

-20

28C64A

-25

Units

Conditions

Min

Max

Min

Max

Min

Max

Address to Output Delay

—

150

—

200

—

250

ns

CE to Output Delay

—

150

—

200

—

250

ns

OE to Output Delay

—70—80—

100

ns

CE or OE High to Output Float

0500550

70

ns

(Note 1)

Output Hold from Address, CE

or OE, whichever occurs first.

0—0—0

—

ns

(Note 1)

Endurance

—

1M

—

1M

—

1M

—

cycles 25

°C, Vcc =

5.0V, Block

Mode (Note 2)

Note 1: Not 100% tested.

2: This parameter is not tested but guaranteed by characterization. For endurance estimates in a specific appli-

cation, please consult the Total Endurance Model which can be obtained on our BBS or website.

Address

CE

OE

Data

WE

Address Valid

High Z

Valid Output

(3) This parameter is sampled and is not 100% tested

High Z

Notes: