Datasheet > DP83910A

DP83910A

更新时间： 2022-10-12 16:28:45

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
14页	262K
描述
DP83910A CMOS SNI Serial Network Interface

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数据手册

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DP83910A 数据手册

6.0 Pin Descriptions

24-Pin DIP

28-Pin PCC

Name

I/O

Description

COL

COLLISION DETECT OUTPUT: Generates an active high signal when

10 MHz collision signal is detected.

RXD

CRS

RECEIVE DATA OUTPUT: NRZ data output from the PLL. This signal

must be sampled on the rising edge of receive clock.

CARRIER SENSE: Asserted on the first valid high-to-low transition on

the RX pair. Remains active until 1.5 bit times after the last bit in

data.

RXC

SEL

RECEIVE CLOCK: The receive clock from the Manchester data after

the PLL has locked. Remains active 5 bit times after deasserting CRS.

MODE SELECT: When high, transmit and transmit are the same

voltage in the idle state. When low, transmit is positive with respect

to transmit in the idle state, at the transformer’s primary.

GROUND PIN

LBK

LOOPBACK: When high, the loopback mode is enabled.

CRYSTAL OR EXTERNAL OSCILLATOR INPUT

CRYSTAL FEEDBACK OUTPUT: Used in crystal connections only.

Connected to ground when using an external oscillator.

TXD

TRANSMIT DATA INPUT: NRZ data input from the controller. The

data is combined with the transmit clock to produce Manchester data.

TXD is sampled on the rising edge of transmit clock.

TXC

TXE

TRANSMIT CLOCK: The 10 MHz clock derived from the 20 MHz

oscillator.

TRANSMIT ENABLE: The encoder begins operation when this input is

asserted high.

TRANSMIT OUTPUT: Differential line driver which sends the encoded

data to the transceiver. The outputs are source followers which require

270X pull-down resistors.

NO CONNECTION: This may be tied to V for the PLCC version to be

compatible with the DP8391.

NO CONNECTION

TEST

FACTORY TEST INPUT: Used to check the chip’s internal functions.

May be tied low or have a 0.01 mf bypass capacitor to ground (for

compatibility with the bipolar DP8391) during normal operation.

POWER CONNECTION

NO CONNECTION

RECEIVE INPUT: Differential receive input pair from the transceiver.

COLLISION INPUT: Differential collision pair input from the

transceiver.

1...3 4 567 8 9...14

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