The SN75ALS126 employs the IMPACT TM process to achieve fast switching speeds and low power dissipation. Fault-flag circuitry is designed to sense and signal a line short on any Y line. Upon detecting an output fault condition, the fault-flag circuit forces the driver output into a low state and signals a fault condition by causing the fault-flag output to go low. The SN75ALS126 can drive a 50- load as required in the IBM GA22-6974-3 specification or a 90- load as used in many I/O systems. Optimum performance can be achieved when the device is used with either the SN75127, SN75128, or SN75129 line receivers. The SN75ALS126 is characterized for operation from 0C to 70C.