XD74LS163 – Synchronous 4-Bit Binary Counter – Xinluda

About this part

The XD74LS163 from Xinluda is a synchronous, fully programmable 4-bit binary counter belonging to the popular 74LS TTL logic family. It features an internal carry look-ahead network that makes it ideal for high-speed counting and n-bit cascading applications without additional external gating. All four flip-flops are clocked simultaneously on the rising edge of the buffered clock input, so the outputs change coincidentally and eliminate the counting spikes associated with asynchronous ripple counters.

Unlike the otherwise pin-compatible XD74LS161, the XD74LS163 provides a synchronous clear: a low level on the clear (synchronous reset) input resets all four flip-flop outputs to low on the next active clock edge rather than asynchronously. This makes the XD74LS163 a preferred choice for designs requiring deterministic, glitch-free reset behavior. The part is supplied in a through-hole DIP-16 package and is part of the XD74LS160 / XD74LS161 / XD74LS163 synchronous 4-bit counter family.

Key Features

• Synchronous 4-bit binary counter, modulo 16 (74LS163 function)
• Internal carry look-ahead with fully decoded terminal count output for fast, cascadable n-bit counting
• Fully synchronous counting — all flip-flops clocked simultaneously on the rising clock edge
• Synchronous clear / synchronous reset (reset occurs on the active clock edge)
• Fully programmable / presettable outputs via synchronous parallel load
• Two count-enable inputs (Count Enable Parallel and Count Enable Trickle) for high-speed synchronous expansion
• Low-power Schottky (LS) TTL technology
• Recommended supply voltage V_CC = 4.75 V to 5.25 V (commercial)
• Input thresholds: V_IH 2.0 V min, V_IL 0.8 V max
• Operating ambient temperature range: 0 °C to 70 °C
• DIP-16 through-hole package

Applications

• Frequency dividers and programmable timers
• Address and sequence counters in legacy digital systems
• Industrial control and instrumentation logic
• Cascaded n-bit binary counting chains
• Educational, prototyping, and TTL retrofit / repair boards

Why Source XD74LS163 from Pacific Component Xchange

The Xinluda XD74LS163 is a specialty 74LS-series logic device with limited authorized-distributor availability, which can make it difficult to procure for production, maintenance, or end-of-life support. Pacific Component Xchange specializes in sourcing hard-to-find, allocated, and obsolete logic and power-management components. We support customers who need reliable supply of legacy TTL parts for long-lifecycle and repair programs, with authenticity verification and global shipping. Request a quote (RFQ) for the XD74LS163 today and our sourcing team will respond with current availability, lead time, and pricing.