BTF1A datasheet(1/16 Pages) AGERE

Teilenummer	BTF1A

Bauteilbeschribung	Dual Differential Transceiver BTF1A With Idle Bus Indicator

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Data Sheet

March 2001

Dual Differential Transceiver BTF1A

With Idle Bus Indicator

Features

Driver Features

s

Produces a logic zero in third state

s

400 mV difference voltage in third state

s

Two line drivers per package

s

Logic to convert TTL input logic levels to differen-

tial, pseudo-emmiter coupled logic (ECL) output

logic levels

s

No line loading when VCC = 0 V

s

High output driver for 50

Ω loads

s

200 mA short-circuit current (typical)

s

2.0 ns maximum propagation delay

s

<0.2 ns output skew (typical)

Receiver Features

s

Two line receivers per package

s

High input impedance

≅ 8 kΩ

s

Logic that converts differential input logic levels to

TTL output logic levels

s

4.0 ns maximum propagation delay

s

<0.20 V input sensitivity (typical)

s

−1.2 V to +7.2 V common-mode range

Common Device Features

s

Common enable for each driver/receiver pair

s

Operating temperature range: –40

°C to +125 °C

(wider than the 41 Series)

s

Single 5.0 V

± 5% supply

s

400 Mbits/s maximum data rate

s

Meets enhanced small device interface (ESDI)

standards

s

Electrostatic discharge (ESD) performance better

than the 41 Series

s

Lower power requirement than the 41 Series

Description

The BTF1A device is a dual differential transceiver

circuit that transmits and receives digital data over

balanced transmission lines and is compatible with

Lucent Technologies Microelectronics Group differ-

ential drivers and receivers. It is designed to provide

a strong logic zero when in the third state. The mini-

mum difference voltage in the third state is 400 mV. It

is designed specifically for bus applications where a

well-defined logic state is needed when the bus is

idle. The driver puts out a logic zero when in the third

state mode, which is easily overriden by an active

buffer on the bus. When all the buffers on the bus are

inactive (third state), the signal on the bus is a zero

indicating that the bus is idle.

The dual drivers translate input TTL logic levels to dif-

ferential pseudo-ECL output levels. The dual receiver

converts differential input logic levels to TTL output

levels. Each driver/receiver pair has its own common

enable control allowing serial data and a control clock

to be transmitted and received on a single integrated

circuit. The BTF1A transceiver requires the customer

to supply termination resistors on the circuit board.

The powerdown loading characteristics of the

receiver input circuit are approximately 8 k

Ω relative

to the power supplies; hence, it will not load the

transmission line when the circuit is powered down.

For those circuits with termination resistors, the line

will remain impedance matched when the circuit is

powered down. The driver does not load the line

when it is powered down.

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