TB5T1

` 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-W loads
2.0-ns Maximum Propagation Delay
0.2-ns Output Skew (typical)
` Receiver Features
High-Input Impedance Approximately 8 kW
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 (JEDECMS-013, DW) and SOIC (D) Package

(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2) Tested in accordance with JEDEC Standard 22, Test Method A114-A.

(3) Tested in accordance with JEDEC Standard 22, Test Method C101.

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 re- ceiver input circuit are approximately 8 kW 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 kW that are connected to VCC to ensure a logical high level input if the inputs are open circuited.