The QS3389 provides a set of 20 active termination circuits which pull data bus signals to the voltage rails. This feature prevents bus signals from floating in the threshold region of standard TTL I/O devices. The QS3389 can replace resistor termination solutions which add DC power dissipation and increase component count. Input clamp diodes help to reduce reflections and undershoot in transmission line environments. Importantly, the terminator circuits pull signals to whichever logic state the signal previously held (high or low). For this reason, this device is also referred to as a last value latch. This device is appropriate for data bus applications where interfacing devices have CMOS inputs with low input currents. These terminators provide sufficient drive to overcome leakage currents and drive corresponding signals away from the TTL threshold region. The QS3389 is characterized for operation at 0C to +70C.