Nexperia USA Inc. 74HC4520PW,118

Overview

74HC4520PW,118 from Nexperia is a dual 4-bit synchronous binary counter IC with two independent clock inputs (nCP0 and nCP1), asynchronous master reset (nMR), and buffered outputs (nQ0–nQ3 per counter). It operates from 2.0 V to 6.0 V, supports dual-edge clocking (LOW-to-HIGH on nCP0 when nCP1 = HIGH; HIGH-to-LOW on nCP1 when nCP0 = LOW), and is rated for -40 °C to +125 °C. It is used in multistage synchronous counting and frequency division circuits.

For engineers reviewing the 74HC4520PW,118 datasheet, 74HC4520PW,118 pinout, 74HC4520PW,118 application, or 74HC4520PW,118 equivalent, key selection criteria include dual-clock edge sensitivity, CMOS-level input compatibility, propagation delay (22–72 ns at VCC = 4.5–6.0 V), TSSOP16 package footprint, and guaranteed operation across industrial and extended temperature ranges.

Technical Context

This device implements two independent 4-bit synchronous binary counters sharing no internal state-each has dedicated clock inputs (nCP0/nCP1), reset (nMR), and outputs (nQ0–nQ3). Clocking logic enables flexible timing control: counter advances only when one clock transitions while the other remains statically asserted (e.g., nCP0↑ with nCP1 = HIGH, or nCP1↓ with nCP0 = LOW).

The architecture uses fully synchronous internal flip-flops with asynchronous active-HIGH master reset overriding all clock activity. Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors, and static/dynamic characteristics are specified across -40 °C to +125 °C with supply voltage ranging 2.0–6.0 V.

Key Specifications

Pinout & Package

TSSOP16 plastic thin shrink small outline package (SOT403-1); 16 leads; body width 4.4 mm; lead pitch 0.65 mm; RoHS-compliant surface-mount package optimized for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 4-bit synchronous counter applications.

Compared with 74HC4520PW,118, the 74HC4040PW,118 offers higher integration (12-bit vs dual 4-bit) but sacrifices timing control and reset granularity, while SN74LV4040APWR trades voltage flexibility and dual-clock functionality for ultra-low quiescent current - making the 74HC4520PW,118 uniquely suited for precision, multi-channel synchronous counting.

Availability

74HC4520PW,118 is available at Aetrix Electronics and suitable for industrial automation controllers, test and measurement instrumentation, and programmable logic timing modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for 74HC4520PW,118 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a leading semiconductor manufacturer specializing in high-performance logic, analog, and discrete components, with core expertise in automotive-grade and industrial reliability standards.

The 74HC4520 belongs to Nexperia's HC-series high-speed CMOS logic family, designed specifically for robust, low-power, wide-supply synchronous counting and timing applications in harsh industrial environments.

FAQ

What is the maximum operating frequency of the 74HC4520PW,118?

The maximum clock frequency is 35 MHz at VCC = 6.0 V and CL = 50 pF, verified by propagation delay (tpd = 22 ns) and setup time (tsu = 14 ns) specifications. At 4.5 V, fmax drops to 30 MHz. These values assume proper PCB layout, decoupling, and load capacitance ≤50 pF - exceeding this load increases delay and may cause timing violations.

Can both clock inputs (nCP0 and nCP1) be driven simultaneously?

No - simultaneous active transitions on both nCP0 and nCP1 violate the function table and result in undefined counter behavior. The device requires one clock to be statically asserted (HIGH for nCP1, LOW for nCP0) while the other receives the advancing edge. Driving both clocks concurrently may cause metastability or skipped counts.

Is the 74HC4520PW,118 pin-compatible with the 74HCT4520PW,118?

Yes - both share identical TSSOP16 pinout (SOT403-1), same pin functions, and mechanical footprint. The key difference is input threshold: 74HC4520 accepts CMOS-level inputs (VIH ≈ 0.7×VCC), while 74HCT4520 accepts TTL-level inputs (VIH = 2.0 V min). Swapping requires verifying source logic family compatibility.

How does the asynchronous master reset (nMR) interact with ongoing clock activity?

nMR is asynchronous and active-HIGH: asserting it forces all eight outputs (1Q0–1Q3, 2Q0–2Q3) LOW immediately, regardless of nCP0/nCP1 state or transitions. Release of nMR returns the counter to its pre-reset state only if clocks remain inactive; otherwise, the next valid clock edge resumes counting from zero.