AM79C960KCW datasheet(99/127 Pages) AMD

99 / 127 page

P R E L I M I N A R Y

AMD

1-441

Am79C960

SWITCHING CHARACTERISTICS: AUI

Notes:

1. DI pulses narrower than tPWODI (min) will be rejected; pulses wider than tPWODI (max) will turn internal DI carrier sense on.

2. DI pulses narrower than tPWKDI (min) will maintain internal DI carrier sense on; pulses wider than tPWKDI (max) will turn

internal DI carrier sense off.

3. CI pulses narrower than tPWOCI (min) will be rejected; pulses wider than tPWOCI (max) will turn internal CI carrier sense on.

4. CI pulses narrower than tPWKCI (min) will maintain internal CI carrier sense on; pulses wider than tPWKCI (max) will turn

internal CI carrier sense off.

Parameter

Symbol

Parameter Description

Test Conditions

Min

Max

Unit

AUI Port

tDOTR

DO+,DO- Rise Time (10% to 90%)

2.5

5.0

tDOTF

DO+,DO- Fall Time (90% to 10%)

2.5

5.0

tDORM

DO+,DO- Rise and Fall Time Mismatch

1.0

tDOETD

DO+/- End of Transmission

200

375

tPWODI

DI Pulse Width Accept/Reject

|VIN| > |VASQ|15

Threshold

(Note 1)

tPWKDI

DI Pulse Width Maintain/Turn-Off

|VIN| > |VASQ|

136

200

Threshold

(Note 2)

tPWOCI

CI Pulse Width Accept/Reject

|VIN| > |VASQ|10

Threshold

(Note 3)

tPWKCI

CI Pulse Width Maintain/Turn-Off

|VIN| > |VASQ|

160

Threshold

(Note 4)

Internal MENDEC Clock Timing

tX1

XTAL1 Period

VIN = External Clock

49.995

50.005

tX1H

XTAL1 HIGH Pulse Width

VIN = External Clock

tX1L

XTAL1 LOW Pulse Width

VIN = External Clock

tX1R

XTAL1 Rise Time

VIN = External Clock

tX1F

XTAL1 Fall Time

VIN = External Clock

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