描述 Description

This series of SN65MLVD20x devices are low-voltage differential line drivers and receivers complying with the proposed multipoint low-voltage differential signaling (M-LVDS) standard (TIA/EIA?899). These circuits are similar to their TIA/EIA-644 standard compliant LVDS counterparts, with added features to address multipoint applications. Driver output current has been increased to support doubly-terminated, 50- load multipoint applications. Driver output slew rates are optimized for signaling rates up to 100 Mbps.

Types 1 and 2 receivers are available. Both types of receivers operate over a common-mode voltage range of ?1 V to 3.4 V to provide increased noise immunity in harsh electrical environments. Type-1 receivers have their differential input voltage thresholds near zero volts (±50 mV), and include 25 mV of hysteresis to prevent output oscillations in the presence of noise. Type-2 receivers include an offset threshold to detect open-circuit, idle-bus, and other fault conditions, and provide a known output state under these conditions.

The intended application of these devices is in half-duplex or multipoint baseband data transmission over controlled impedance media of approximately 100- characteristic impedance. The transmission media may be printed circuit board traces, backplanes, or cables. (Note: The ultimate rate and distance of data transfer is dependent upon the attenuation characteristics of the media, the noise coupling to the environment, and other application-specific characteristics).

These devices are characterized for operation from ?40°C to 85°C.

特性 Features

? Low-Voltage Differential 30- up to 100 Mbps
? Power Dissipation at 100 Mbps
? Driver: 50 mW Typical
? Receiver: 30 mW Typical

? Meets or Exceeds Current Revision of M-LVDS Standard TIA/EIA–899 for Multipoint Data Interchange
? Controlled Driver Output Voltage Transition Times for Improved Signal Quality
? –1-V to 3.4-V Common-Mode Voltage Range Allows Data Transfer With up to 2 V of Ground Noise
? Type-1 Receivers Incorporate 25 mV of Hysteresis
? Type-2 Receivers Provide an Offset (100 mV) Threshold to Detect Open-Circuit and Idle-Bus Conditions
? Operates From a Single 3.3-V Supply
? Propagation Delay Times Typically 2.3 ns for Drivers and 5 ns for Receivers
? Power-Up/Down Glitch-Free Driver
? Driver Handles Operation Into a Continuous Short Circuit Without Damage
? Bus Pins High Impedance When Disabled or VCC ≤ 1.5V
? 200-Mbps Devices Available (SN65MLVD201, 203, 206, and 207)
The signaling rate of a line is the number of voltage transitions that are made per second expressed in bps (bits per second) units.