10

FN8109.2

August 28, 2009

Equivalent AC Load Circuits

Symbol Table

Power-up Timing

Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits

established by characterization and are not production tested.

PARAMETER

SYMBOL

TYP

(Note 3)

UNIT

Power-up to Read Operation (Note 5)

100

µs

Power-up to Write Operation (Note 5)

5ms

Capacitance

PARAMETER

SYMBOL

TEST CONDITIONS

MAX

UNIT

Input/output Capacitance (Note 5)

10

pF

Input Capacitance (Note 5)

6

pF

NOTE:

5. This parameter is periodically sampled and not 100% tested.

TABLE 2. AC CONDITIONS OF TEST

Input Pulse Levels

0V to 3V

Input Rise and Fall Times

5ns

Input and Output Timing Levels

1.5V

TABLE 3. MODE SELECTION

CE

OE

WE

MODE

I/O

POWER

L

L

H

Read

Active

LH

L

Write

Active

H

X

X

Standby and write

inhibit

High Z

Standby

X

L

X

Write inhibit

—

—

X

X

H

Write inhibit

—

—

5V

1.92k

Ω

30pF

OUTPUT

1.37k

Ω

WAVEFORM

INPUTS

OUTPUTS

Must be

steady

Will be

steady

Ma y change

from LO W

to HIGH

Will change

from LO W

to HIGH

Ma y change

from HIGH

to LO W

Will change

from HIGH

to LO W

Don’t Care:

Changes

Allowed

Changing:

State Not

Known

N/A

Center Line

is High

Impedance

X28HC64