78Q8392L 查看數據表（PDF） - TDK Corporation

零件编号

产品描述 (功能)

比赛名单

78Q8392L

Low Power Ethernet Coaxial Transceiver

TDK Corporation 

JABBER FUNCTION

When valid data on the TX± pins detected, the jabber

timer is started. If there is valid data for more than 20

ns, a latch is set which disables the transmitter

output and enables the 10 MHz output on the CD±

pins. The latch is reset within 0.5 seconds after the

valid data is removed from the transmitter input

(TX±). This action resets the jabber timer and

disables the 10 MHz CD output. The TX± inputs

must remain inactive during the 0.5 second reset

period.

DATA MEDIA

78Q8392L

Low Power Ethernet

Coaxial Transceiver

HEARTBEAT FUNCTION

The 10 MHz CD outputs are enabled for about 1 µs

at approximately 1.1 µs after the end of each

transmission. The heartbeat signal tells the DTE that

the circuit is functioning. This is implemented by

starting the heartbeat timer when the valid data

signal indicates the end of a transmission. This

function is disabled when HBE pin is tied to VEE.

RECEIVER

RXI

INPUT

BUFFER

CDS

EQUALIZER

LP FILTER

TXO

TRANSMIT

OUTPUT DRIVER

COLLISION

THRESHOLD

SLICER

NARROW

PULSE

FILTER

RX DATA

VALID

TRANSITION

PERIOD

TAMER

SQUELCH

COMPARATOR

RX+

RX-

ENABLE

SQUELSH

THRESHOLD

COLLISION

COMPARATOR

PULSE

SHAPING

FILTER

SLICER

BUFFERED TX

TX ON

CONTROL LOGIC

TRANSMIT INPUT

BUFFER

TX+

TX-

TX DISABLE

JABBER TIMER

BLANKING TIMER

HEART BEAT TIMER

TX DATA VALID TRANSITION

PERIOD

TIMER

NARROW

PULSE

FILTER

TX ± > -250 mV

TX ± < -250 mV

END TRANSMIT TRANSITION

END

TIMER

TX± DISABLE

CD ± ON

10 MHz

OSC

COMPARATOR

SIGNAL

PRESET

DETECT

ENABLE

BANDGAP

REFERENCE

AND CURRENT

REFERENCE

CD+

CD-

RR+

RR-

FIGURE 1: 78Q8392L General System Block Diagram

3

Share Link: