Logic device/transceiver/encoder

The VHCT245A is an advanced high-speed CMOS octal bus transceiver fabricated on a silicon-gate CMOS process. It achieves high operating speeds similar to equivalent bipolar Schottky TTLs while maintaining CMOS low power consumption. VHCT245A is suitable for bidirectional asynchronous communication between data buses. The direction of data transmission is determined by the T/R input level. An enable input can be used to disable the device, effectively isolating the bus. Protection circuitry ensures that 0V to 7V is applied to the input and output (Note 1) pins regardless of the supply voltage. These circuits prevent device damage due to mismatched supply and input/output voltages. The device can be used as an interface between 5V and 3V systems as well as two power systems such as battery backup.

The LVT162244 and LVTH162244 contain sixteen non-inverting buffers with 3-state outputs that can be used as memory and address drivers, clock drivers, and bus-oriented transmitter/receivers. The device is nibble controlled. Each 3-state control input can be shorted for 8-bit or 16-bit operation. The LVT162244 and LVTH162244 have a series resistance equivalent to 25 Ω in both the high and low states of the output. This design reduces line noise in applications such as memory address drivers, clock drivers, and bus transceivers/transmitters. The LVTH162244 data inputs include bus holds, eliminating the need for external pull-up resistors to hold unused inputs. These buffers and line drivers are suitable for low voltage (3.3V) VCC applications, but provide a TTL interface to the 5V environment. The LVT162244 and LVTH162244 are fabricated on an advanced BiCMOS process, which enables high-speed operation similar to 5V ABTs while maintaining low power consumption.