The TB5T1 device is a dual differential driver/receiver circuit that transmits and receives digital data over balanced transmission lines. The dual drivers translate input TTL logic levels to differential pseudo-ECL output levels. The dual receivers convert differential-input logic levels to TTL output levels. Each driver or 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 TB5T1 requires the customer to supply termination resistors on the circuit board.

The power-down loading characteristics of the receiver input circuit are approximately 8 k relative to the power supplies; hence, it does not load the transmission line when the circuit is powered down.

In circuits with termination resistors, the line remains impedance- matched when the circuit is powered down. The driver does not load the line when it is powered down.

All devices are characterized for operation from -40°C to 85°C.

The logic inputs of this device include internal pull-up resistors of approximately 40 k that are connected to VCC to ensure a logical high level input if the inputs are open circuited.

• Functional Replacement for the Agere BTF1A
• Driver Features
  • Third-State Logic Low Output
  • ESD Protection HBM > 3 kV, CDM > 2 kV
  • No Line Loading when VCC = 0
  • Capable of Driving 50- loads
  • 2.0-ns Maximum Propagation Delay
  • 0.2-ns Output Skew (typical)
• Receiver Features
  • High-Input Impedance Approximately 8 k
  • 4.0-ns Maximum Propagation Delay
  • 50-mV Hysteresis
  • Slew Rate Limited (1 ns min 80% to 20%)
  • ESD Protection HBM > 3 kV, CDM > 2 kV
  • -1.1-V to 7.1-V Input Voltage Range
• Common Device Features
  • Common Enable for Each Driver/Receiver Pair
  • Operating Temperature Range: -40°C to 85°C
  • Single 5.0 V ± 10% Supply
  • Available in Gull-Wing SOIC (JEDEC MS-013, DW) and SOIC (D) Package