4-bit synchronous counter for high-speed logic chains
The TI SN74LV163AD is a 4-bit synchronous binary counter from the 74LV low-voltage logic family. It counts up on each positive edge of the clock, with a synchronous reset that clears the outputs without waiting for the next clock edge — a feature that avoids the glitch risk of asynchronous reset in state-machine designs. The 90 MHz count rate gives enough headroom for most industrial timing and sequencing applications, and the 2 V to 5.5 V supply range lets it bridge 3.3 V and 5 V logic domains directly.
90 MHz count rate — timing margin in practice
At 90 MHz the SN74LV163AD runs nearly 3.3× faster than the CD74HCT390E (27 MHz), which matters when you are counting encoder pulses or dividing a high-speed clock in a PLL feedback path. The synchronous reset means the counter clears on the next clock edge, not immediately — so if you need a glitch-free reset that aligns with the system clock, this part delivers it without external synchronisation logic. The positive-edge trigger matches the majority of FPGA and MCU clock outputs, simplifying the interface.