Nexperia USA Inc. 74HC193D,653

Overview

74HC193D,653 from Nexperia is a 4-bit synchronous binary up/down counter with asynchronous parallel load and master reset. It features separate CPU/CPD clock inputs for directional counting, active-HIGH MR and active-LOW PL controls, and dual terminal count outputs (TCU/TCD) that replicate clock waveforms for multistage cascading. Used in programmable timers, frequency dividers, and position tracking circuits where bidirectional counting with preset capability is required.

For engineers reviewing the 74HC193D,653 datasheet, 74HC193D,653 pinout, 74HC193D,653 application, or 74HC193D,653 equivalent, this device supports precise state control in digital logic systems requiring deterministic edge-triggered counting, zero-latency parallel loading, and ripple-free carry/borrow propagation across stages.

Technical Context

The 74HC193D,653 implements fully synchronous 4-bit binary counting with independent up/down clock domains - CPU triggers increment on LOW-to-HIGH transition while CPD triggers decrement under identical edge timing, provided the opposing clock is held HIGH. Its asynchronous PL and MR inputs override all clock activity, enabling immediate state capture or full reset without waiting for clock edges.

Terminal count outputs TCU and TCD are active-LOW and mirror the respective clock waveform at overflow (1111 → 0000) and underflow (0000 → 1111), allowing direct connection to higher-order stage clocks without external gating logic. Internal flip-flop structure ensures glitch-free output transitions synchronized to clock edges.

Key Specifications

Pinout & Package

74HC193D,653 is housed in a plastic small outline package (SO16), SOT109-1, with 16 leads and 3.9 mm body width. Pin 1 is marked by a notch or dot; pin numbering follows standard SOIC convention (counterclockwise from top-left corner).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT193D,653, the 74HC193D,653 offers broader supply flexibility and superior low-power performance, while SN74LS193N trades power efficiency and temperature range for direct TTL compatibility in legacy 5 V systems.

Availability

74HC193D,653 is available at Aetrix Electronics and suitable for programmable timers, motion encoders, frequency dividers, and digital panel meters requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for 74HC193D,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 logic, discrete, and MOSFET solutions with focus on efficiency, reliability, and sustainability.

The 74HC193 belongs to Nexperia's 74HC logic family - engineered for low-power, wide-supply-voltage digital control in industrial automation, automotive subsystems, and consumer electronics where robustness and predictability are essential.

FAQ

What is the maximum clock frequency supported by 74HC193D,653?

The 74HC193D,653 supports a maximum clock frequency of 16 MHz at VCC = 4.5 V and ambient temperature ≤ +85 °C, based on worst-case propagation delay (65 ns) from CPU/CPD to Qn. At 6.0 V and 25 °C, fmax reaches 24 MHz, but derating applies above 110 °C per package thermal limits.

Can CPU and CPD be driven simultaneously?

No - the datasheet explicitly states that only one clock input may be held HIGH at any time to guarantee predictable behavior. Driving both CPU and CPD HIGH risks undefined counting behavior, including missed or spurious transitions, due to internal logic contention.

How does the TCU output behave during an up-count sequence?

TCU goes LOW on the LOW-to-HIGH transition of CPU when the counter transitions from 1111 (15) to 0000 (0), and remains LOW until CPU returns HIGH - effectively duplicating the CPU waveform for one full cycle. This allows TCU to directly clock the next counter stage without additional edge-detection logic.

Is 74HC193D,653 pin-compatible with 74HCT193D,653?

Yes - both share identical SO16 (SOT109-1) pinout, functional block diagram, and terminal assignments. The sole difference is input threshold compatibility: 74HC193 accepts CMOS-level inputs (VIH ≥ 0.7×VCC), while 74HCT193 accepts TTL-level inputs (VIH ≥ 2.0 V), making them mechanically and electrically interchangeable in most 5 V systems.