CAT28C257

4

Doc. No. 1015, Rev. D

Symbol

Test

Conditions

Min

Typ

Max

Units

Input/Output Capacitance

10

pF

Input Capacitance

6

pF

MODE SELECTION

Mode

CE

WE

OE

I/O

Power

Read

L

H

L

ACTIVE

Byte Write (WE Controlled)

L

H

ACTIVE

Byte Write (CE Controlled)

L

H

ACTIVE

Standby, and Write Inhibit

H

X

X

High-Z

STANDBY

Read and Write Inhibit

X

H

H

High-Z

ACTIVE

Note:

(1) This parameter is tested initially and after a design or process change that affects the parameter.

(2) Output floating (High-Z) is defined as the state when the external data line is no longer driven by the output buffer.

28C257-12

28C257-15

Symbol

Parameter

Min

Typ

Max

Min

Typ

Max

Units

Read Cycle Time

120

150

ns

CE Access Time

120

150

ns

Address Access Time

120

150

ns

OE Access Time

50

70

ns

CE Low to Active Output

0

0

ns

OE Low to Active Output

0

0

ns

CE High to High-Z Output

50

50

ns

OE High to High-Z Output

50

50

ns

Output Hold from Address Change

0

0

ns

A.C. CHARACTERISTICS, Read Cycle

Symbol

Parameter

Min

Typ

Max

Units

Power-Up to Read

100

µs

Power-Up to Write

5

10

ms

Power-Up Timing