Nexperia USA Inc. 74HC193DB,112

Overview

74HC193DB,112 from Nexperia is a presettable synchronous 4-bit binary up/down counter in SO16 (SOT109-1) package, featuring separate CPU and CPD clock inputs, asynchronous master reset (MR), asynchronous parallel load (PL), and active-low terminal count outputs (TCU/TCD). It operates from 2.0 V to 6.0 V, supports -40 °C to +125 °C ambient range, and delivers ≤65 ns propagation delay at 4.5 V - used in digital timing control, programmable logic sequencers, and multistage cascade counters.

For engineers reviewing the 74HC193DB,112 datasheet, 74HC193DB,112 pinout, 74HC193DB,112 application, or 74HC193DB,112 equivalent, key selection considerations include its dual-edge-triggered counting direction control, guaranteed asynchronous load/reset behavior independent of clock state, TTL-compatible input thresholds (74HCT variant), and direct cascading capability via TCU/TCD outputs without external logic.

Technical Context

The device implements four edge-triggered D-type flip-flops with synchronous counting logic gated by CPU/CPD enable states. Count direction is determined solely by which clock input (CPU or CPD) receives the LOW-to-HIGH transition while the other remains HIGH - preventing metastability during mode switching. The TCU and TCD outputs replicate the respective clock waveforms with predictable delay, enabling direct connection to higher-order stage clocks in ripple-cascaded configurations.

Asynchronous functions (MR, PL) override all clock activity: MR forces Q0–Q3 LOW regardless of input conditions, while PL loads D0–D3 into Q0–Q3 on PL LOW, even if clocks are static. Input clamp diodes allow safe interfacing to voltages exceeding VCC when current-limiting resistors are used.

Key Specifications

Pinout & Package

74HC193DB,112 uses the SO16 plastic small outline package (SOT109-1), 16-pin, 3.9 mm body width, with standard 1.27 mm lead pitch and gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC193DB,112, the 74HCT193DB,112 offers superior noise margin in mixed-logic systems, while SN74HC193N trades SMT compatibility for mechanical robustness and hand-soldering ease - neither matches the original's optimized SO16 thermal performance and volume production readiness.

Availability

74HC193DB,112 is available at Aetrix Electronics and suitable for industrial PLCs, digital panel meters, test equipment sequencers, and legacy system emulation boards requiring stable component supply across extended temperature ranges.

Supply support for 74HC193DB,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 focused on high-volume, high-reliability logic, discrete, and MOSFET solutions - serving automotive, industrial, and consumer markets with JEDEC-qualified components.

The 74HC193 belongs to Nexperia's industry-standard 74HC logic family, designed for robust, low-power, pin-compatible replacements of legacy TTL and earlier CMOS counters in space-constrained industrial control applications.

FAQ

Can 74HC193DB,112 operate reliably at 3.3 V supply?

Yes - the 74HC193DB,112 is fully specified from 2.0 V to 6.0 V. At 3.3 V, VIH is guaranteed ≥2.1 V and VOL ≤0.26 V at 4 mA load, ensuring clean interfacing with 3.3 V microcontrollers and FPGAs without level shifters.

What happens if both CPU and CPD are HIGH simultaneously?

Per the function table, simultaneous HIGH on CPU and CPD places the counter in hold mode - outputs remain unchanged until one clock input transitions LOW-to-HIGH while the other stays HIGH. This prevents undefined counting and simplifies control logic design.

Is the parallel load operation truly asynchronous?

Yes - when PL is pulled LOW, D0–D3 appear on Q0–Q3 within ≤69 ns (VCC = 4.5 V), regardless of CPU/CPD state or timing. This occurs even if clocks are static or floating, making it suitable for emergency presetting in safety-critical sequences.

How does TCU/TCD behave during cascaded counting?

TCU goes LOW on the CPU edge that advances from 15 → 0, duplicating CPU's waveform; TCD goes LOW on the CPD edge that decrements from 0 → 15. Both outputs retain the clock's edge alignment and pulse width - enabling direct connection to the next stage's CPU/CPD without buffering or inversion.