NXP Semiconductors 74LV393D,112

Overview

74LV393D from Nexperia is a dual 4-bit binary ripple counter IC with two independent asynchronous master reset inputs (1MR, 2MR), two edge-triggered clock inputs (1CP, 2CP), and eight buffered outputs (1Q0–1Q3, 2Q0–2Q3). It operates from 1.0 V to 3.6 V, advances on HIGH-to-LOW clock transitions, and clears all flip-flops to LOW when MR is HIGH. Used in digital timing, frequency division, and event counting circuits where low-voltage logic compatibility and ripple-stage cascading are required.

For engineers reviewing the 74LV393D datasheet, 74LV393D pinout, 74LV393D application, or 74LV393D equivalent, this page delivers verified functional architecture, SO14 package mapping, propagation delay specs at multiple VCC levels, static input/output thresholds, and real-world design implications for ripple counter synchronization and reset timing margins.

Technical Context

The 74LV393D implements two independent 4-stage T-type flip-flop chains, each advancing on the falling edge of its dedicated clock input. Its asynchronous master reset asserts independently per counter, forcing all four outputs LOW regardless of clock state or timing phase.

Each counter provides binary division by powers of two up to 2⁴ = 16 per section, enabling combined division ratios up to 2⁸ = 256 via external cascading. Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors.

Key Specifications

Pinout & Package

74LV393D is housed in a plastic small outline package (SO14) per SOT108-1, with 14 leads, 3.9 mm body width, and standard 1.27 mm lead pitch. Pin 1 is marked by a notch or dot; pin numbering follows counterclockwise sequence from top-left corner when viewed from top with marking side up.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV393AIPW, the 74LV393D offers easier hand-soldering and thermal management in SO14; versus 74HC393N, it enables true low-voltage operation down to 1.0 V and maintains TTL compatibility at 3.3 V without level translation.

Availability

74LV393D is available at Aetrix Electronics and suitable for industrial timer modules, serial data rate dividers, LED blink pattern generators, and position encoder quadrature pre-dividers requiring stable component supply across extended temperature ranges.

Supply support for 74LV393D 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 specializing in high-volume, high-reliability logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74LV logic family targets low-voltage, low-power digital systems requiring robust noise immunity and wide supply flexibility - designed specifically for energy-efficient embedded control and signal conditioning applications.

FAQ

What is the maximum operating frequency of the 74LV393D at 3.3 V?

The 74LV393D achieves a typical maximum clock frequency of 90 MHz at VCC = 3.3 V under recommended conditions (CL = 15 pF). This value drops to 20 MHz at VCC = 2.0 V due to increased propagation delay. The actual usable frequency depends on cascade depth and output loading - for reliable 8-bit division, keep input clock ≤ 24 MHz to avoid ripple-induced setup violations.

Can the two counters be cascaded to form an 8-bit ripple counter?

Yes - connect 1Q3 to 2CP to enable automatic carry from the first to second counter. However, total propagation delay accumulates across all eight stages: worst-case tpd for full 8-bit toggle exceeds 100 ns at VCC = 3.3 V. For synchronous 8-bit counting, use a dedicated 8-bit counter IC instead.

Does the 74LV393D support hot insertion or live voltage sequencing?

No - the device lacks power-on reset or Ioff protection. Applying VCC before inputs may cause latch-up or excessive current through input clamps. Always ramp VCC before applying signals, and ensure inputs remain within -0.5 V to VCC + 0.5 V during power transitions per Absolute Maximum Ratings.

How does the asynchronous reset affect output timing behavior?

When 1MR or 2MR goes HIGH, all corresponding Q outputs transition to LOW within tPHL (max 32 ns at VCC = 3.6 V), independent of clock edge timing. Outputs settle cleanly without glitches because reset overrides internal flip-flop states directly - no race condition occurs between MR assertion and CP edge arrival.