SN74AVC157

A SN74AVC157 Dynamic Output Control (DOC) circuit is implemented, which, during the transition, initially lowers the output impedance to effectively drive the load and, subsequently, raises the impedance to reduce noise. Figure 1 shows typical V_OL vs I_OL and V_OH vs I_OH curves to illustrate the output impedance and drive capability of the circuit. At the beginning of the signal transition, the DOC circuit provides a maximum dynamic drive that is equivalent to a SN74AVC157 high-drive standard-output device. For more information, refer to TI application reports AVC Logic Family Technology and Applications, literature number SCEA006, and Dynamic Output Control (DOC^TM) Circuitry Technology and Applications, literature number SCEA009.

This SN74AVC157 quadruple 2-line to 1-line data selector/multiplexer is operational at 1.2-V to 3.6-V V_CC, but is designed specifically for 1.65-V to 3.6-V V_CC operation.

The SN74AVC157 features a common strobe (G) input. When the strobe is high, all outputs are low. When the strobe is low, a 4-bit word is selected from one of two sources and is routed to the four outputs. The device provides true data.

This SN74AVC157 device is fully specified for partial-power-down applications using I_off. The I_off circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down.

The SN74AVC157 is characterized for operation from 40°C to 85°C.