Nexperia USA Inc. 74HCT193D,653

Overview

74HCT193D,653 from Nexperia is a TTL-level-compatible, presettable synchronous 4-bit binary up/down counter in SO16 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. Used in digital timing control circuits requiring bidirectional counting with preset capability, such as industrial encoder interfaces and programmable logic sequencers.

For engineers reviewing the 74HCT193D,653 datasheet, 74HCT193D,653 pinout, 74HCT193D,653 application, or 74HCT193D,653 equivalent, key selection criteria include TTL input compatibility, -40 °C to +125 °C operation, 20 MHz max clock frequency at 4.5 V, asynchronous load/reset timing, and SO16 thermal performance (12.4 mW/K derating above 110 °C).

Technical Context

This device implements four edge-triggered D-type flip-flops with synchronous counting logic and independent up/down clock paths. Count direction is controlled by holding one clock HIGH while pulsing the other - CPU active LOW-to-HIGH for increment, CPD for decrement - ensuring deterministic state transitions without race conditions.

The TCU and TCD outputs replicate the respective clock waveforms at terminal states (15→0 and 0→15), enabling direct connection to higher-order stage clocks in ripple-cascaded counters. Asynchronous PL and MR override all clock activity, loading data or clearing outputs regardless of clock state, with propagation delays as low as 22 ns (Qn) and 29 ns (TCD/TCU) at VCC = 4.5 V.

Key Specifications

Pinout & Package

74HCT193D,653 uses the SOT109-1 (SO16) plastic small outline package: 16-pin, 3.9 mm body width, 1.27 mm pitch, JEDEC MS-012 compliant. Thermal resistance θ_JA = 80 K/W; total power dissipation derates linearly at 12.4 mW/K above 110 °C.

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,653 and SN74LS193N, the 74HCT193D,653 uniquely balances TTL input compatibility, low power (160 μA max), and extended temperature operation - making it optimal for new industrial designs requiring robustness and interoperability without sacrificing speed or efficiency.

Availability

74HCT193D,653 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and programmable logic sequencers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT193D,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 components for automotive, industrial, and consumer applications with focus on efficiency and sustainability.

The 74HCT193 belongs to Nexperia's industry-standard logic family, designed specifically for robust, pin-compatible replacements in legacy 5 V digital systems requiring TTL compatibility, low power, 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 10 ns at VCC = 4.5 V (25 °C), increasing to 13 ns over full temperature range. This ensures proper edge detection and avoids metastability in the internal flip-flop clock path, critical for deterministic counting in high-speed control loops.

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

Yes - MR is dominant: when both PL and MR are active (MR = HIGH, PL = LOW), MR overrides PL and forces Q0–Q3 = 0000 immediately. The parallel data is ignored, and all outputs remain LOW until MR is deasserted and a valid clock edge occurs.

How does TCU behave during an up-count sequence from 14 to 0?

At count = 14, the next CPU LOW-to-HIGH transition advances to 15 and causes TCU to go LOW. TCU remains LOW until CPU returns HIGH - effectively duplicating the CPU waveform - then goes HIGH again. This allows TCU to directly clock the next counter stage without additional edge-detection circuitry.

Is the SO16 package RoHS-compliant and lead-free?

Yes - 74HCT193D,653 in SOT109-1 package is RoHS-compliant and lead-free per EU Directive 2011/65/EU, with matte tin (Sn) termination and halogen-free molding compound, certified to IPC/JEDEC J-STD-020 moisture sensitivity level 1 (unlimited floor life at ≤30 °C/60% RH).