Nexperia USA Inc. 74HCT393D,653

Overview

74HCT393D,653 from Nexperia is a dual 4-bit binary ripple counter IC with TTL-compatible inputs, asynchronous master reset per counter, and HIGH-to-LOW edge-triggered clock operation. It delivers 28 distinct division ratios (e.g., ÷2 to ÷256) in one SO14 package, operates from 4.5 V to 5.5 V, and supports industrial temperature range (−40 °C to +125 °C). It is used in digital timing control, frequency division, and event counting circuits where low-power CMOS logic with TTL input thresholds is required.

For engineers reviewing the 74HCT393D,653 datasheet, 74HCT393D,653 pinout, 74HCT393D,653 application, or 74HCT393D,653 equivalent, this page provides verified functional identity, SO14 pin mapping, real-world timing parameters (e.g., tpd = 15–38 ns at VCC = 4.5 V), dual-counter isolation behavior, and validated alternatives for clock tree design and legacy TTL interface upgrades.

Technical Context

The 74HCT393D,653 implements two independent 4-stage ripple counters using T-type flip-flops cascaded in series, each advancing on the HIGH-to-LOW transition of its dedicated clock input (1CP or 2CP). Each counter has its own active-HIGH asynchronous master reset (1MR/2MR), enabling independent clearing without affecting the other counter.

Its TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V) ensure direct compatibility with legacy 5 V TTL logic families, while CMOS output drive (VOH ≥ 3.98 V at IO = −4 mA, VOL ≤ 0.26 V at IO = 4 mA) maintains noise margin in mixed-signal systems. Input clamp diodes allow safe interfacing to voltages exceeding VCC when current-limiting resistors are used.

Key Specifications

Pinout & Package

74HCT393D,653 is housed in a plastic small outline package (SO14, SOT108-1) with 14 leads and 3.9 mm body width. Pin 1 is index-marked; pin 14 is VCC; pin 7 is GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC393D,653 and SN74LV393APWR, the 74HCT393D,653 uniquely bridges legacy TTL systems and modern CMOS loads via its TTL-input/CMOS-output architecture, offering guaranteed interoperability without level shifters - a critical advantage in retrofit and maintenance scenarios.

Availability

74HCT393D,653 is available at Aetrix Electronics and suitable for motor control timing, legacy system clock division, power supply sequencing, and event counter interface applications requiring stable component supply across industrial temperature ranges and long-term production cycles.

Supply support for 74HCT393D,653 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 delivering high-performance, reliable logic, analog, and MOSFET solutions optimized for efficiency-critical applications in automotive, industrial, and consumer markets.

The 74HCT393D,653 belongs to Nexperia's 74HCT logic family, designed specifically to replace obsolete TTL devices while maintaining pin-for-pin compatibility and improving power efficiency, noise immunity, and thermal robustness in industrial control systems.

FAQ

What is the maximum clock frequency supported by the 74HCT393D,653?

The 74HCT393D,653 supports a maximum clock frequency of 48 MHz at VCC = 4.5 V and CL = 50 pF, and 18 MHz at VCC = 4.5 V over the full −40 °C to +125 °C range. This value is measured from CP to Q0 output and assumes proper load capacitance and signal integrity.

Can both counters be reset simultaneously using a single signal?

No - the 74HCT393D,653 has two independent master reset inputs (1MR on pin 3, 2MR on pin 12). To reset both counters simultaneously, an external OR gate or wired-OR connection is required to drive both pins HIGH. There is no internal shared reset function.

Is the 74HCT393D,653 compatible with 3.3 V logic inputs?

No - the 74HCT393D,653 is specified for TTL-level inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 5 V) and requires a 4.5–5.5 V supply. Driving it with 3.3 V logic may result in unreliable HIGH detection; use 74LVC393 or level-shifting circuitry instead.

Does the ripple counter architecture introduce cumulative propagation delay between stages?

Yes - as a true ripple counter, each stage triggers the next, resulting in cumulative delay: tpd(Q0→Q1) ≈ 5–15 ns, tpd(Q1→Q2) adds another 5–15 ns, etc. Total delay from CP to Q3 is up to 3× the Q0 delay. This limits maximum usable frequency in synchronous downstream logic and must be accounted for in timing budgets.