Nexperia USA Inc. 74HCT193PW,118

Overview

74HCT193PW,118 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, enabling use in industrial timing control and programmable logic sequencers.

For engineers reviewing the 74HCT193PW,118 datasheet, 74HCT193PW,118 pinout, 74HCT193PW,118 application, or 74HCT193PW,118 equivalent, this device supports precise bidirectional counting with deterministic edge-triggered behavior, low propagation delay (≤65 ns at 4.5 V), and robust noise immunity - critical for reliable state-machine sequencing and digital instrumentation design.

Technical Context

The 74HCT193PW,118 implements four edge-triggered D-type flip-flops with synchronous counting logic gated by CPU/CPD inputs. Count direction is controlled exclusively by holding one clock HIGH while pulsing the other - no internal arbitration or metastability mitigation beyond standard CMOS latch design.

Its asynchronous PL and MR inputs override all clock activity and directly force Q0–Q3 outputs, with defined timing relationships (e.g., PL-to-Qn ≤69 ns at 4.5 V). TCU and TCD replicate CPU/CPD waveforms at terminal states (15→0 and 0→15), enabling ripple-cascaded multi-digit counters without external logic.

Key Specifications

Pinout & Package

TSSOP16 plastic thin shrink small outline package (SOT403-1); 16 leads; body width 4.4 mm; lead pitch 0.65 mm; RoHS-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 74HC193PW,118 and SN74LS193N, the 74HCT193PW,118 uniquely balances TTL input compatibility, low static power (<160 μA at 125 °C), and industrial temperature operation - making it optimal for new 5 V embedded control designs where interoperability and reliability are prioritized over raw speed.

Availability

74HCT193PW,118 is available at Aetrix Electronics and suitable for industrial programmable logic controllers, digital panel meters, test equipment sequencers, and legacy bus arbitration logic requiring stable component supply across extended temperature ranges.

Supply support for 74HCT193PW,118 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 optimized for efficiency and miniaturization.

The 74HCT193 belongs to Nexperia's industry-standard 74-series logic family, designed specifically for robust, pin-compatible replacements in legacy 5 V digital systems requiring TTL input compatibility and extended temperature resilience.

FAQ

What is the minimum pulse width required on CPU or CPD for reliable counting?

The minimum HIGH or LOW pulse width on CPU or CPD is 13 ns at VCC = 4.5 V and –40 °C to +85 °C. This ensures proper flip-flop triggering without missing counts. Shorter pulses may cause metastability or skipped transitions, especially near temperature extremes.

Can PL and MR be asserted simultaneously, and what happens?

Yes - MR has priority over PL. When both are active (MR = HIGH, PL = LOW), the counter resets to Q0–Q3 = 0 immediately, ignoring D0–D3 inputs. This hierarchy ensures fail-safe zero initialization even during parallel load attempts.

How does TCU behave when counting from 15 back to 0?

On the LOW-to-HIGH transition of CPU when the counter holds 15 (1111), TCU goes LOW and remains LOW until CPU returns HIGH - duplicating the CPU waveform. This allows TCU to directly clock the next-stage counter without additional edge-detection circuitry.

Is the 74HCT193PW,118 compatible with 3.3 V logic inputs?

No - its TTL-compatible inputs require VIH ≥2.0 V, but are not guaranteed to recognize 3.3 V logic HIGHs reliably when VCC = 5 V due to input threshold tolerances. For 3.3 V systems, use 74LVC193 or level-shifting circuitry.