Datasheet > 驱动程序和接口 > 线路驱动器或接收器> SN75ALS085

SN75ALS085

更新时间： 2024-09-20 09:12:11

品牌	Logo	应用领域
德州仪器 - TI		驱动器局域网
页数	文件大小	规格书
17页	242K
描述
LAN ACCESS UNIT INTERFACE DUAL DRIVER/RECEIVER

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数据手册

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SN75ALS085 数据手册

SN75ALS085

LAN ACCESS UNIT INTERFACE DUAL DRIVER/RECEIVER

SLLS054B – APRIL 1989 – REVISED MAY 1995

DW OR NT PACKAGE

Meets or Exceeds the Requirements of IOS

8802.3:1989 and ANSI/IEEE Std 802.3-1988

(TOP VIEW)

Interdevice Loop-Back Paths for System

Testing

TXI1

TXEN1

LOOP1

GND

TXO1

Squelch Function Implemented on the

Receiver Inputs

RXI1

RXEN1

RXO1

RXO2

RXEN2

GND

Drivers Will Drive a Balanced 78-Ω Load

19 GND

Transformer Coupling Not Required in

System

GND

RXI2

Power-Up/Power-Down Protection (Glitch

Free)

LOOP2

TXEN2

TXI2

Isolated Ground Pins for Reduced Noise

Coupling

TXO2

Fault-Condition Protection Built into the

Device

Driver Inputs Are Level-Shifted ECL

Compatible

description

The SN75ALS085 is a monolithic, high-speed, advanced low-power Schottky, dual-channel driver/receiver

device designed for use in the AUI of ANSI/IEEE Std 802.3-1988. The two drivers on the device drive a 78-Ω

balanced, terminated twisted-pair transmission line up to a maximum length of 50 meters. In the off (idle) state,

the drivers maintain minimal differential output voltage on the twisted-pair line and, at the same time, remain

within the required output common-mode range.

With the driver enable (TXEN) high, upon receiving the first falling edge into the driver input, the differential

outputs will rise to full-amplitude output levels within 25 ns. The output amplitude is maintained for the remainder

of the packet. After the last positive packet edge is transmitted into the driver, the driver will maintain a minimum

of 70% full differential output for a minimum of 200 ns, then decay to a minimum level for the reset (idle) condition

within 8 µs. Disabling the driver by taking the driver enable low will also force the output into the idle condition

after the normal 8-µs timeout. While operating, the drivers are able to withstand a set of fault conditions and not

suffer damage due to the faults being applied. The drivers power up in the idle state to ensure that no activity

is placed on the twisted-pair cable that could be interpreted as network traffic.

The line receiver squelch function interfaces to a differential twisted-pair line terminated external to the device.

The receiver squelch circuit allows differential receive signals to pass through as long as the input amplitude

and pulse duration are greater than the minimum squelch threshold. This ensures a good signal-to-noise ratio

while the data path is active and prevents system noise from causing false data transitions during line shutdown

and line-idle conditions. The RXO outputs default to a high level and the RXEN outputs default to a low level

while the squelch function is blocking the data path through the receiver (idle). The line receiver squelch will

become active within 50 ns when the input squelch threshold is exceeded. RXEN will be driven high when the

squelch circuit is allowing data to pass through the receiver. The receiver squelch circuit can also withstand a

set of fault conditions while operating without causing permanent damage to the device.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

12 3 4 5 6 7...17

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与SN75ALS085相关器件

型号	品牌	获取价格	描述	数据表
SN75ALS085_14	TI	获取价格	LAN ACCESS UNIT INTERFACE DUAL DRIVER/RECEIVER
SN75ALS085DW	TI	获取价格	LAN ACCESS UNIT INTERFACE DUAL DRIVER/RECEIVER
SN75ALS085DWE4	TI	获取价格	DUAL LINE TRANSCEIVER, PDSO24, GREEN, PLASTIC, SOIC-24
SN75ALS085DWG4	TI	获取价格	LAN Access Unit Interface Dual Driver/Receiver 24-SOIC 0 to 70
SN75ALS085DWR	TI	获取价格	DUAL LINE TRANSCEIVER, PDSO24, GREEN, PLASTIC, SOIC-24
SN75ALS085DWRE4	TI	获取价格	DUAL LINE TRANSCEIVER, PDSO24, GREEN, PLASTIC, SOIC-24
SN75ALS085DWRG4	TI	获取价格	DUAL LINE TRANSCEIVER, PDSO24, GREEN, PLASTIC, SOIC-24
SN75ALS085NT	TI	获取价格	LAN ACCESS UNIT INTERFACE DUAL DRIVER/RECEIVER
SN75ALS085NT-00	TI	获取价格	DUAL LINE TRANSCEIVER, PDIP24
SN75ALS085NT-10	TI	获取价格	DUAL LINE TRANSCEIVER, PDIP24

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