Dual BCD up-counter in the 4000B family
The CD4518BPW is a dual BCD up-counter from Texas Instruments' 4000B series, containing two independent 4-bit BCD counters in a single 16-TSSOP package. Each element counts up on the positive or negative clock edge, with an asynchronous reset that clears the counter regardless of the clock state.
Operates from 3 V to 18 V, covering the full 4000B CMOS supply window. The 8 MHz typical count rate sets the upper edge for cascaded counters in frequency division or event counting — above this rate the propagation delay through the internal flip-flops accumulates and the external clock must be derated for the full temperature span.
Package and board integration
The 0.173-inch (4.40 mm) width footprint matches industry-standard TSSOP-16 land patterns, and the supplier device package is also 16-TSSOP — no footprint ambiguity.