Nexperia USA Inc. 74HCT193PW,112

Overview

74HCT193PW,112 from Nexperia is a TTL-level-compatible, presettable synchronous 4-bit binary up/down counter in TSSOP16 package. It features separate CPU and CPD clock inputs, 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, used in programmable logic controllers for bidirectional position tracking.

For engineers reviewing the 74HCT193PW,112 datasheet, 74HCT193PW,112 pinout, 74HCT193PW,112 application, or 74HCT193PW,112 equivalent, key selection criteria include TTL input compatibility, propagation delay ≤65 ns at 4.5 V, asynchronous load/reset timing, TCU/TCD output waveform duplication, and TSSOP16 thermal derating (8.5 mW/K above 91 °C).

Technical Context

This device implements four edge-triggered D-type flip-flops with synchronous counting logic and independent up/down clock control. The CPU and CPD inputs are mutually exclusive-only one may be HIGH during operation to ensure deterministic state transitions. Count direction is determined solely by which clock line receives the LOW-to-HIGH edge while the other remains HIGH.

Terminal count outputs TCU and TCD replicate the respective clock waveforms with predictable delays (e.g., CPU→TCU = 15–41 ns at 4.5 V), enabling direct connection to higher-order stage clocks without external gating. Asynchronous PL and MR override all clock activity and guarantee immediate state capture or zeroing regardless of clock phase.

Key Specifications

Pinout & Package

TSSOP16 plastic thin shrink small outline package (SOT403-1); 16 leads; body width 4.4 mm; 0.65 mm pitch; exposed pad not present; JEDEC MO-153 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT193PW,112, the 74HC193PW,118 offers broader voltage flexibility but lacks native TTL compatibility, while the SN74LS193N sacrifices thermal robustness and timing precision for legacy pinout continuity - making the HCT variant optimal for new industrial 5 V systems requiring guaranteed interoperability and extended temperature support.

Availability

74HCT193PW,112 is available at Aetrix Electronics and suitable for programmable logic controllers, industrial encoder interfaces, test equipment pulse generators, and automotive transmission control systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT193PW,112 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, reliability, and sustainability.

The 74HCT193 belongs to Nexperia's industry-standard 74-series logic family, designed specifically for robust, drop-in replacement of legacy TTL functions in industrial, automotive, and computing applications demanding wide temperature operation and low power.

FAQ

Can 74HCT193PW,112 operate at 3.3 V?

No. The 74HCT193 is specified only for 4.5 V to 5.5 V supply. At 3.3 V, input thresholds fall outside TTL compatibility range (VIH requires ≥2.0 V, but VOH drops below 2.4 V at IO = –4 mA), risking unreliable logic levels. Use 74LVC193 or 74AUP1G193 for 3.3 V systems.

What happens if both CPU and CPD are HIGH simultaneously?

When both CPU and CPD are HIGH, the counter holds its current state - no counting occurs. However, this condition violates the "only one clock HIGH" recommendation in the datasheet. If either clock then transitions LOW-to-HIGH while the other remains HIGH, counting resumes predictably. Avoid simultaneous LOW states to prevent metastability.

How is the TCU output timed relative to the CPU clock edge?

TCU goes LOW on the same LOW-to-HIGH CPU edge that advances the counter from 15 (1111) to 0 (0000). Its falling edge is delayed by tpd(CPU→TCU) = 15–41 ns (VCC = 4.5 V, –40 °C to +125 °C), and it returns HIGH on the subsequent CPU HIGH-to-LOW transition - duplicating the CPU waveform for seamless multistage clocking.

Is the TSSOP16 package RoHS and REACH compliant?

Yes. The 74HCT193PW,112 in SOT403-1 (TSSOP16) package meets RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, with lead-free terminations and halogen-free molding compound. Certificate of Compliance is available upon request from Nexperia's official portal.