Nexperia USA Inc. 74HC393D,652

Overview

74HC393D,652 from Nexperia is a dual 4-bit binary ripple counter IC with independent clock inputs per section, 2V–6V supply range, CMOS-level input thresholds, and typical propagation delay of 18 ns at 4.5V. It performs asynchronous counting in digital timing, frequency division, and event sequencing circuits, commonly used in industrial control logic and instrumentation counters.

For engineers reviewing the 74HC393D,652 datasheet, 74HC393D,652 pinout, 74HC393D,652 application, or 74HC393D,652 equivalent, key selection criteria include independent clock domain support, ripple-carry architecture limitations, TTL-compatible output drive, and dual-section reset isolation for modular counter design.

Technical Context

This device integrates two identical 4-bit asynchronous binary counters in one SO-14 package. Each section features separate clock (CP0/CP1), master reset (MR0/MR1), and Q0–Q3 outputs. Counting occurs on the HIGH-to-LOW clock transition, with no synchronous load or enable functions.

The ripple architecture means propagation delay accumulates across stages (e.g., Q3 lags Q0 by ~72 ns at 4.5V), limiting maximum operating frequency to 36 MHz at V_CC = 4.5V. Output drive capability is ±5.2 mA at V_CC = 4.5V, compatible with 74HC/74HCT logic families.

Key Specifications

Pinout & Package

Supplied in 14-pin SOIC (SO-14) package, 3.9 mm body width, 1.27 mm pitch, surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual binary counter applications.

Compared with SN74HC393N and 74HCT393D,653, the 74HC393D,652 offers optimal SMT manufacturability and wide-supply flexibility, while the DIP variant eases lab validation and the HCT version ensures robustness with TTL-level drivers.

Availability

74HC393D,652 is available at Aetrix Electronics and suitable for industrial counter modules, frequency division circuits, test equipment event sequencers, and digital logic training boards requiring stable component supply and long-lifecycle support.

Supply support for 74HC393D,652 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 global semiconductor expert focused on essential semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer applications.

The 74HC logic family targets cost-sensitive, high-reliability digital control systems where speed, power efficiency, and broad voltage operation are critical design constraints.

FAQ

Can the two sections of the 74HC393D,652 be cascaded for an 8-bit counter?

Yes - Q3A can drive CP1 to cascade sections, forming a divide-by-256 counter. However, due to ripple architecture, total propagation delay reaches ~144 ns, limiting max input frequency to approximately 4 MHz. No internal carry lookahead or synchronous enable is provided, so external gating is needed for precise start/stop control.

What is the minimum recommended V_CC for reliable operation at room temperature?

The absolute minimum V_CC is 2.0 V per datasheet specifications. At 2.0 V, propagation delay increases to ~60 ns per stage and output drive drops to ±2.6 mA. For stable 10 MHz operation with full fanout, V_CC ≥ 4.5 V is recommended to maintain timing margins and noise immunity.

Is there a version with synchronous reset or clock enable?

No - the 74HC393D,652 implements only asynchronous master reset. For synchronous control, consider the 74HC161 (4-bit synchronous binary counter) or 74HC163 (with synchronous reset). These require additional control logic but eliminate ripple-related metastability during reset assertion.

How does the 74HC393D,652 behave when MR is held LOW during clocking?

When MR is LOW, all Q outputs remain forced LOW regardless of clock activity. The internal flip-flops retain no state; no counting occurs. Upon MR release (HIGH), the counter begins from 0 on the next valid clock edge. This behavior is strictly asynchronous and immune to clock glitches during reset assertion.