AMD

2-41

Am27C256

CAPACITANCE

Parameter

Parameter

Test

Symbol

Description

Conditions

Typ

Max

Typ

Max

Typ

Max

Typ

Max

Unit

Input Capacitance

8

12

8

12

6

10

10

12

pF

Output Capacitance

8

12

8

12

8

10

12

14

pF

Notes:

1. This parameter is only sampled and not 100% tested.

CDV028

PL 032

PD 028

TS 032

SWITCHING CHARACTERISTICS over operating range unless otherwise specified

(Notes 1, 3 and 4)

Parameter

Test

JEDEC

Standard

Description

Conditions

-55

-70

-90

-120

-150

-200

-255

Unit

Address to

CE = OE = Min

–

–

–

–

–

–

–

Output Delay

Max

55

70

90

120

150

200

250

ns

Chip Enable to

Min

–

–

–

–

–

–

–

Output Delay

Max

55

70

90

120

150

200

250

ns

Output Enable to

Min

–

–

–

–

–

–

–

Output Delay

Max

35

40

40

50

50

50

50

ns

Min

–

–

–

–

–

–

–

(Note 2)

Max

25

25

25

30

30

30

30

ns

Min

0

0

0

0

0

0

0

Max

–

–

–

–

–

–

–

ns

Parameter

Symbols

Am27C256

Notes:

2. This parameter is only sampled and not 100% tested.

4. For the -55 and -70:

Input Rise and Fall Times: 20 ns

Input Pulse Levels: 0 V to 3 V

Timing Measurement Reference Level: 1.5 V for inputs and outputs

For all other versions:

Input Rise and Fall Times: 20 ns

Input Pulse Levels: 0.45 V to 2.4 V

Timing Measurement Reference Level: 0.8 V and 2 V inputs and outputs

Chip Enable HIGH or

Output Enable HIGH,

whichever comes

first, to Output Float

Output Hold from

Addresses,

CE,

or

OE, whichever

occurred first