ML4668 Просмотр технического описания (PDF) - Micro Linear Corporation

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ML4668

Low Power Single Chip 10BASE-FL Transceiver

Micro Linear Corporation 

AC ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

Transmit

FTXIDF

PTXDC

tTXNPW

tTXODY

tTXLP

tTXFPW

tTXSOI

tTXSDY

tTXJ

Receive

Transmit Idle Frequency

Transmit Idle duty Cycle

Transmit Turn-On Pulse Width

Transmit Turn-On Delay

Transmit loopback Start-up Delay

Transmit Turn-Off Pulse Width

Transmit Turn-Off Start of Idle

Transmit Steady State Propagation Delay

Transmit Jitter into 31Ω Load

FRXSFT Receive Squelch Frequency Threshold

tRXODY Receive Turn-On Delay

tRXFX

Last Bit Received to Slow Decay Output

tRXSDY Receive Steady State Propagation Delay

tRXJ

Receive Jitter

tAR

Differential Output Rise Time 20% to 80% (Rx±, COL±)

tAF

Differential Output Fall Time 20% to 80% (Rx±, COL±)

Collision

tCPSQE Collision Present to SQE Assert

tSQEXR Time for SQE to Deactivate After Collision

FCLF

Collision Frequency

PCLPDC Collision Pulse Duty Cycle

tSQEDY SQE Test Delay (Tx Inactive to SQE)

tSQETD SQE Test Duration

Jabber and LED Timing

tJAD

tJRT

tJSQE

tLED

tLLPH

tLLCL

Jabber Activation Delay

Jabber Reset Unjab Time

Delay from Outputs Disabled to Collision Oscillator On

RCV, CLSN, XMT On Time

Low Light Present to LMON High

Low Light Present to LMON Low

Note 1:

Note 2:

Note 3:

Note 4:

Note 5:

Limits are guaranteed by 100% testing, sampling, or correlation with worst-case test conditions.

This dose not include the current from the AUI pull-down resistors, or LED status outputs.

LED drivers can sink up to 20mA, but VOL will be higher.

Does not include pre-bias current for fiber optic LED which would typically be 3mA.

Threshold for switching from Link Fail to Link Pass (Low Light).

ML4668

MIN

TYP

MAX

UNITS

0.85

1.25

MHz

45

55

%

20

ns

200

ns

500

ns

180

ns

400

2100

ns

15

50

ns

±1.5

ns

2.51

4.5

MHz

285

ns

230

300

ns

15

50

ns

±1.5

ns

4

ns

4

ns

0

350

ns

0

700

ns

8.5

11.5

MHz

40

50

60

%

0.6

1.6

µs

0.5

1.0

1.5

µs

20

70

150

ms

250

450

750

ms

100

ns

8

16

32

ms

3

5

10

µs

250

750

ms

5

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