NXP Semiconductors 74HCT393D,652

Overview

74HCT393D,652 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 4.5 V to 5.5 V, advances on HIGH-to-LOW clock transitions, clears outputs to LOW upon active-HIGH reset, and supports industrial temperature range (−40 °C to +125 °C) in SO14 package. Used for frequency division and timing control in digital logic systems.

For engineers reviewing the 74HCT393D,652 datasheet, 74HCT393D,652 pinout, 74HCT393D,652 application, or 74HCT393D,652 equivalent, this page delivers verified functional identity, SO14 pin mapping, TTL-compatible input thresholds, propagation delay (15–38 ns at 4.5 V), maximum clock frequency (27–48 MHz), and real-world substitution guidance - all extracted from Nexperia's Rev. 9 product data sheet.

Technical Context

The 74HCT393D,652 implements two independent 4-stage ripple counters using T-type flip-flops cascaded in series, where each stage toggles on the falling edge of its preceding stage's output - resulting in inherent propagation delay accumulation across Q0→Q1→Q2→Q3. Clocking is asynchronous per counter, with no internal synchronization between the two 4-bit sections.

Its TTL-level input compatibility (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) enables direct interfacing with legacy 5 V logic families, while CMOS output drive (VOH ≥ 3.98 V, VOL ≤ 0.26 V at IO = ±4 mA) ensures robust signal integrity into standard capacitive loads up to 50 pF.

Key Specifications

Pinout & Package

74HCT393D,652 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 7 is GND; pin 14 is VCC. The device uses standard JEDEC MS-012 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC393D,653 and SN74LV393APWR, the 74HCT393D,652 uniquely bridges legacy 5 V TTL logic without level translation while maintaining industrial temperature rating and SO14 footprint compatibility - making it the only direct replacement for existing 74LS393-based timing circuits.

Availability

74HCT393D,652 is available at Aetrix Electronics and suitable for industrial control systems, sensor interface modules, and legacy digital timing circuits requiring stable component supply across long production lifecycles.

Supply support for 74HCT393D,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 delivering high-performance logic, analog, and MOSFET solutions optimized for efficiency, reliability, and manufacturability in high-volume applications.

The 74HCT393 belongs to Nexperia's industry-standard 74HCT logic family, designed specifically to provide TTL-compatible input behavior and robust CMOS output drive in industrial-grade packages for seamless integration into legacy and mixed-signal systems.

FAQ

What is the maximum clock frequency supported by the 74HCT393D,652?

The 74HCT393D,652 supports a maximum clock frequency of 27 MHz over the −40 °C to +85 °C range and 18 MHz over the full −40 °C to +125 °C industrial range, measured at 1CP or 2CP with CL = 50 pF. Performance degrades predictably with rising temperature and load capacitance due to ripple-through propagation delay accumulation.

Can the two counters operate synchronously from a single clock source?

Yes - tie 1CP and 2CP together to drive both counters from one clock, but note that outputs will not be synchronized due to independent internal ripple paths and potential skew between sections. For true synchronous operation, use a synchronous counter like the 74HCT163 instead.

Is the 74HCT393D,652 pin-compatible with the older 74LS393?

Yes - the 74HCT393D,652 shares identical SO14 pinout, function mapping, and electrical interface with the 74LS393, including TTL-compatible inputs and open-collector-equivalent output drive strength. It serves as a direct, low-power, CMOS-based drop-in replacement.

Does the 74HCT393D,652 require external pull-up resistors on its outputs?

No - the 74HCT393D,652 features push-pull CMOS outputs capable of sourcing 4 mA and sinking 4 mA at VCC = 4.5 V, eliminating need for external pull-ups in standard 5 V logic interfacing. Pull-ups are only required if driving open-drain buses or exceeding specified fan-out limits.