AM79C100JC datasheet(18/24 Pages) AMD

18 / 24 page

AMD

Am79C100

SWITCHING CHARACTERISTICS (Continued)

Parameter

Symbol

Parameter Description

Min

Max

Unit

Receive Timing

tPWKRD

RXD Pulse Width Maintain/

VIN >VTHS min

136

200

Turn-Off Threshold

(Note 5)

tRON

Receiver Start Up Delay

Tested with 5 MHz

200

400

(RXD to DI

±)

Sinusoid

tRVB

First Validly Timed Bit

tRON + 100

on DI

tRSD

Receiver Static Propagation

Delay (RXD

± to DI±)

tRETD

DI End of Transmission

200

tRHD

RXD

± ↑ to DI+ ↑

(Note 1)

tRSD – 2.5

tRSD + 2.5

and DI–

↓ Delay

tRLD

RXD

± ↓ to DI+ ↓

(Note 1)

tRSD – 2.5

tRSD + 2.5

and DI–

↑ Delay

tRR

DI+, DI–, CI+, CI– Rise Time

(10% to 90%)

tRF

DI+, DI–, CI+, CI– Fall Time

(10% to 90%)

tRM

± and CI± Rise and Fall

Time Mismatch (tRR – tRF)

tRCVON

RCV Asserted Delay

tRON – 50

tRON + 100

tRCVOFF

RCV De-asserted Delay

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

tCOLON

COL Asserted Delay

tCON – 50

tCON + 100

tCOLOFF

COL De-asserted Delay

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.

Test Conditions

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