Nexperia USA Inc. 74HCT193D,652

Overview

74HCT193D,652 from Nexperia is a TTL-level-compatible, presettable synchronous 4-bit binary up/down counter in SO16 package. It features separate CPU/CPD clocks, asynchronous master reset (MR), asynchronous parallel load (PL), and active-low terminal count outputs (TCU/TCD) for multistage cascading. Operates from 4.5 V to 5.5 V across –40 °C to +125 °C, supporting industrial timing and control logic in programmable logic controllers and digital instrumentation.

For engineers reviewing the 74HCT193D,652 datasheet, 74HCT193D,652 pinout, 74HCT193D,652 application, or 74HCT193D,652 equivalent, key selection criteria include TTL input compatibility, guaranteed asynchronous load/reset timing at full temperature range, propagation delay ≤65 ns (VCC = 4.5 V), terminal count output waveform duplication, and SO16 package thermal performance under sustained counting loads.

Technical Context

This device implements four edge-triggered D-type flip-flops with synchronous up/down counting logic controlled by mutually exclusive CPU and CPD inputs. Count direction is determined solely by which clock line is pulsed while the other remains HIGH - no internal state machine governs mode switching.

Terminal count outputs TCU and TCD are fully asynchronous, driven LOW on terminal transitions (15→0 and 0→15 respectively) and duplicating the corresponding clock edge's timing characteristics. Asynchronous PL and MR override all clock activity and guarantee deterministic output states independent of clock phase or frequency.

Key Specifications

Pinout & Package

74HCT193D,652 uses the SOT109-1 package: plastic small outline, 16-pin, 3.9 mm body width, standard SO16 footprint compatible with IPC-7351B.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC193D,652 and SN74LS193N, the 74HCT193D,652 uniquely balances TTL input compatibility, industrial temperature support, and low dynamic power - making it optimal for new designs requiring robust 5 V logic integration without redesigning signal conditioning.

Availability

74HCT193D,652 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and test equipment requiring stable component supply with guaranteed long-term availability and traceable lot documentation.

Supply support for 74HCT193D,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, reliable logic, discrete, and MOSFET solutions with focus on efficiency and sustainability.

The 74HCT193 belongs to Nexperia's industry-standard 74-series logic family, engineered for drop-in compatibility with legacy TTL systems while delivering CMOS power efficiency and extended temperature resilience.

FAQ

Can 74HCT193D,652 operate reliably at 5.5 V supply?

Yes - the device is rated for VCC = 4.5 V to 5.5 V per Table 5. At 5.5 V, VOH remains ≥4.4 V (IO = –4.0 mA) and VOL stays ≤0.26 V (IO = 4.0 mA), ensuring full noise margin against 5 V TTL thresholds. Derated timing (e.g., tPD ≤73 ns max) and increased ICC (≤160 μA) apply per Table 7.

What happens if both CPU and CPD are pulsed simultaneously?

Simultaneous LOW-to-HIGH transitions on CPU and CPD violate the "only one clock HIGH" condition specified in Section 1. The behavior is undefined: outputs may glitch, lock, or produce metastable states. Design must enforce mutual exclusion via external logic or controller sequencing - no internal arbitration exists.

Is the SO16 package (SOT109-1) RoHS compliant and lead-free?

Yes - Nexperia confirms SOT109-1 packaging for 74HCT193D,652 meets RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 3 marking for lead-free terminations. The device carries the "Pb-free" marking on the package body and is compatible with standard SnAgCu reflow profiles (peak 260 °C).

How does TCU/TCD behave during asynchronous load or reset?

During PL = LOW or MR = HIGH, TCU and TCD remain HIGH (inactive) regardless of internal count state. They only assert LOW upon terminal transitions occurring *after* PL/MR deassertion and subsequent valid CPU/CPD edges - confirmed by Function Table row 3 (Parallel load) and row 1 (Reset) in Table 3.