TLF10721

January 1994

DS3885 BTL Arbitration Transceiver

General Description

The DS3885 is one in a series of transceivers designed spe-

cifically for the implementation of high performance Future-

tion Transceiver is designed to conform to IEEE 11941

(Backplane Transceiver LogicBTL) as specified in the

The Arbitration

Transceiver incorporates the competition logic internally

cation by minimizing the on board logic required

The DS3885 driver output configuration is an NPN open col-

lector which allows Wired-OR connection on the bus Each

driver output incorporates a Schottky diode in series with its

collector to isolate the transistor output capacitance from

the bus thus reducing the bus loading in the inactive state

The BTL drivers also have high sink current capability to

comply with the bus loading requirements defined within

IEEE 11941 BTL specification

Backplane Transceiver Logic (BTL) is a signaling standard

that was invented and first introduced by National Semicon-

(Continued)

Features

Y

9-bit inverting BTL transceiver

Y

Meets IEEE 11941 standard on Backplane Transceiver

Logic (BTL)

Y

Includes on chip competition logic and parity checking

Y

Supports live insertion

Y

Glitch free power-updown protection

Y

Typically less than 5 pF bus-port capacitance

Y

Low bus-port voltage swing (typically 1V) at 80 mA

Y

Open collector bus-port output allows Wired-OR

connection

Y

Exceeds 2 kV ESD testing (Human Body Model)

Y

Individual bus-port ground pins minimize ground bounce

Y

Controlled rise and fall time to reduce noise coupling to

adjacent lines

Y

TTL compatible driver and control inputs

Y

QGND pins for precise receiver thresholds

Y

Product offered in PLCC and PQFP package styles

Connection Diagrams

TLF10721 – 2

TLF10721 – 13

Order Number DS3885V or DS3885VF

See NS Package Number V44A or VF44B

TRI-STATE

is a registered trademark of National Semiconductor Corporation

C1995 National Semiconductor Corporation

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