NXP Semiconductors 74HC193DB,118

Overview

74HC193DB,118 from Nexperia is a presettable synchronous 4-bit binary up/down counter with 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, and delivers 43 ns typical propagation delay at 4.5 V - used in programmable logic controllers for bidirectional position tracking.

For engineers reviewing the 74HC193DB,118 datasheet, 74HC193DB,118 pinout, 74HC193DB,118 application, or 74HC193DB,118 equivalent, key selection criteria include synchronous reversible counting behavior, TTL-compatible input thresholds (HCT variant), SO16 package compatibility, and terminal count output waveform duplication for multistage cascading.

Technical Context

This device implements four edge-triggered D-type flip-flops with synchronous up/down control logic and asynchronous load/reset. Count direction is determined 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 (TCU = CPU at 1111, TCD = CPD at 0000), 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.

Key Specifications

Pinout & Package

74HC193DB,118 is supplied in SO16 (SOT109-1) package: plastic small outline, 16-pin, 3.9 mm body width, surface-mount compatible.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT193DB,118, the HC variant offers wider supply range and lower static power but requires CMOS-level drive; versus SN74LS193N, it provides superior voltage flexibility and thermal stability at the cost of TTL input compatibility.

Availability

74HC193DB,118 is available at Aetrix Electronics and suitable for industrial automation, programmable logic controllers, and digital instrumentation requiring stable component supply across extended temperature ranges.

Supply support for 74HC193DB,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, analog, and discrete components with focus on efficiency and sustainability.

The 74HC/HCT logic family targets general-purpose digital interfacing and sequencing applications, emphasizing low power, wide voltage operation, and robust ESD/latch-up performance for industrial and automotive use.

FAQ

What is the maximum operating frequency of the 74HC193DB,118?

The 74HC193DB,118 achieves a maximum clock frequency of 16 MHz at VCC = 4.5 V and Tamb = 25 °C, based on 43 ns typical propagation delay (CPU→Qn). At full temperature range (-40 °C to +125 °C) and VCC = 4.5 V, fmax is derated to 13 MHz per datasheet Table 8.

Can the 74HC193DB,118 be used in cascaded counter configurations?

Yes - its TCU and TCD outputs duplicate the CPU and CPD clock waveforms with matching timing, allowing direct connection to the clock inputs of subsequent 74HC193 stages. This eliminates external inverters or buffers needed in ripple-carry designs, preserving synchronous behavior across stages.

How does the asynchronous parallel load (PL) interact with active clock inputs?

When PL is asserted LOW, data on D0–D3 is immediately loaded into Q0–Q3 regardless of CPU, CPD, or MR states. Clock inputs are disabled during PL assertion, preventing unintended counting; normal clocked operation resumes only after PL returns HIGH.

Is the 74HC193DB,118 pin-compatible with the 74HCT193DB,118?

Yes - both share identical SO16 (SOT109-1) pinout, functional block diagram, and package dimensions. The sole difference is input threshold levels: 74HC193DB,118 uses CMOS-compatible VIH/VIL, while 74HCT193DB,118 accepts standard TTL voltage levels, enabling direct substitution where input drive matches.