1FEATURES
• Low-Voltage Functional Replacements for the
Agere BRF1A, BRF2A, BRS2A, and BRS2B
• Pin-Equivalent to General Trade 26LS32
Devices
• High-Input Impedance Approximately 8 kΩ
• 3.5-ns Maximum Propagation Delay
• TB3R1 Provides 50-mV Hysteresis
• TB3R2 With -125-mV Threshold Offset for
Preferred State Output
• -0.5-V to 5.2-V Common Mode Range
• Single 3.3 V ±10% Supply
• Slew Rate Limited (0.5 ns min 80% to 20%)
• TB3R2 Output Defaults to Logic 1 When Inputs
Left Open or Shorted to VCC or GND
• ESD Protection HBM > 3 kV, CDM > 2 kV
• Operating Temperature Range: -40°C to 85°C
• Available SOIC (D) Package

APPLICATIONS
• Digital Data or Clock Transmission Over
Balanced Lines

DESCRIPTION
These quad differential receivers accept digital data
over balanced transmission lines. They translate
differential input logic levels to TTL output logic
levels.
The TB3R1 is a pin- and function-compatible
replacement for the Agere Systems BRF1A and
BRF2A; it includes 3-kV HBM and 2-kV CDM ESD
protection.
The TB3R2 is a pin- and function-compatible
replacement for the Agere Systems BRS2A and
BRS2B and incorporates a -125-mV receiver input
offset, preferred state output, 3-kV HBM and 2-kV
CDM ESD protection. The TB3R2 preferred state
feature places the output in the high state when the
inputs are open, shorted to ground, or shorted to the
power supply.
The power-down loading characteristics of the
receiver input circuit are approximately 8 kΩ relative to the power supplies; hence they do not load the
transmission line when the circuit is powered down.
The package for these differential line receivers is the
16-pin SOIC (D) package.
The enable inputs of this device include internal
pullup resistors of approximately 40 kΩ that are
connected to VCC to ensure a logical high level input
if the inputs are open circuited.