AM79C98 datasheet(17/22 Pages) AMD

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AMD

Am79C98

SWITCHING CHARACTERISTICS (continued)

Parameter

Symbol

Parameter Description

Min

Max

Unit

Receive Timing

tPWKRD

RXD Pulse Width

|VIN| >|VTHS|

136

200

Maintain/Turn-Off Threshold

(Note 5)

tRON

Receiver Start Up Delay

5 MHz Sinusoid

200

400

(RXD to DI+/–)

tRVB

First Validly Timed Bit

tRON + 100

on DI+/– (RXD to DI)

tRSD

Receiver Static Propagation

Delay (RXD to DI)

tRETD

DI End of Transmission

200

tRHD

RXD L–>H to DI+ L–>H

(Note 1)

tRSD – 2.5

tRSD + 2.5

and DI– H–>L Delay

tRLD

RXD H–>L to DI+ H–>L

(Note 1)

tRSD – 2.5

tRSD + 2.5

and DI- L->H Delay

tRR

DI+, DI–, CI+, CI– Rise

5.0

Time (10% to 90%)

tRF

DI+, DI–, CI+, CI– Fall

5.0

Time (10% to 90%)

tRM

DI+/– & CI+/– Rise and Fall

2.0

Time Mismatch (|tRR – tRF|)

tRCVON

RCV Asserted Delay

tRON – 50

tRON + 100

tRCVOFF

RCV De-asserted Delay

tRSD + 250

Collision Detection and SQE Test

tCON

Collision Turn-On

500

Delay (CI+/–)

tCOFF

Collision Turn-Off

500

Delay (CI+/–)

tPER

Collision Period (CI+/–)

117

tCPW

Collision Output Pulse Width

(CI+/-)

tSQED

SQE Test Delay Time

600

1600

tSQEL

SQE Test Length

500

1500

Notes:

1. Parameter not tested.

2. Uses switching test load.

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

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

internal DO carrier sense off.

5. RXD pulses narrower than tPWKRD (min) will maintain internal RXD carrier sense on; pulses wider than tPWKRD (max) will turn

internal RXD carrier sense off.

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