8-bit D-type register with inverted tri-state outputs
The SN74AS534DW is an 8-bit D-type flip-flop from TI's Advanced Schottky (AS) logic family. It clocks data in on the positive edge of the clock and presents the inverted state at the outputs when the output-enable is low. The tri-state outputs let multiple devices share a common bus — the inverted polarity is useful for active-low data paths or inverting buffer stages in 5 V backplane and memory-mapped I/O designs.
125 MHz clock and 9 ns propagation delay — timing headroom for synchronous buses
Rated at 125 MHz clock frequency and 9 ns max propagation delay (at 5 V, 50 pF load), this part keeps up with fast synchronous buses in 5 V systems. The 9 ns delay includes both clock-to-output and the tri-state turn-on time — a key number for setup-and-hold margin when the register feeds a synchronous FIFO or address latch. The 128 mA quiescent current is higher than later BiCMOS or CMOS logic families, so factor it into the 5 V rail budget if the board carries several bus-interface devices.
Packaged in a 20-pin SOIC with 7.50 mm body width, the SN74AS534DW is a surface-mount part for commercial-temperature environments (0°C to 70°C).
RoHS non-compliant — plan for exemption or alternate
The SN74AS534DW is listed as RoHS non-compliant. The lifecycle status is Active.