NXP Semiconductors 74HC393DB,112

Overview

74HC393DB,112 from Nexperia is a dual 4-bit binary ripple counter IC with two independent asynchronous master reset inputs (1MR, 2MR), two edge-triggered clock inputs (1CP, 2CP), and eight buffered outputs (1Q0–1Q3, 2Q0–2Q3). It operates from 2.0 V to 6.0 V, advances on HIGH-to-LOW clock transitions, and clears all outputs to LOW when MR is HIGH - used in frequency division, timing control, and digital logic state sequencing.

For engineers reviewing the 74HC393DB,112 datasheet, 74HC393DB,112 pinout, 74HC393DB,112 application, or 74HC393DB,112 equivalent, this device supports precise binary division by 2ⁿ (n ≤ 4 per counter), requires no external pull-ups for TTL/CMOS interfacing due to integrated clamp diodes, and delivers sub-25 ns propagation delay at 4.5 V with 50 pF load.

Technical Context

The 74HC393DB,112 implements two cascaded T-type flip-flops per 4-bit section, forming asynchronous ripple counters where each stage triggers the next on its output transition - resulting in cumulative propagation delay across bits. Its dual-counter architecture enables independent clocking and resetting, supporting divide-by-16 operations per channel or combined modulo-256 counting via external interconnect.

Input clamp diodes allow direct interface to voltages exceeding VCC when used with current-limiting resistors. The device complies with JEDEC JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V), supports HBM ESD >2000 V and CDM >1000 V, and meets latch-up immunity >100 mA per JESD78 Class II Level B.

Key Specifications

Pinout & Package

74HC393DB,112 is packaged in SO14 (SOT108-1): plastic small outline, 14-lead, 3.9 mm body width, with standard pin 1 index marking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 4-bit binary counter applications.

Compared with 74HCT393DB,112, the HC variant offers wider supply range (2–6 V) and lower static current, while SN74HC393N trades surface-mount compactness for mechanical robustness and ease of manual assembly - all share identical logic behavior and pin mapping.

Availability

74HC393DB,112 is available at Aetrix Electronics and suitable for industrial automation timing, embedded instrumentation signal conditioning, and consumer electronics frequency synthesis requiring stable component supply and long-term obsolescence management.

Supply support for 74HC393DB,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, analog, and MOSFET solutions - delivering energy-efficient, automotive-qualified, and industrial-grade components with rigorous quality control.

The 74HC393 belongs to Nexperia's 74HC logic family, designed specifically for low-power, high-noise-immunity digital signal routing and timing in space-constrained industrial and consumer applications.

FAQ

What is the maximum clock frequency supported by the 74HC393DB,112?

The 74HC393DB,112 supports up to 107 MHz at VCC = 6.0 V with CL = 50 pF load, as specified in Table 7 of the datasheet. At 4.5 V, the maximum clock frequency is 90 MHz under the same conditions. Performance degrades linearly below 4.5 V - e.g., 625 kHz at 2.0 V - due to increased propagation delay.

Can the two counters operate with different clock sources?

Yes - the 74HC393DB,112 features fully independent clock inputs (1CP and 2CP) and master reset lines (1MR and 2MR), allowing simultaneous operation with unrelated clock domains. No internal coupling exists between counters; each advances only on its own clock edge and resets only on its dedicated MR signal.

Is the 74HC393DB,112 compatible with 3.3 V logic systems?

Yes - the 74HC393DB,112 operates reliably from 2.0 V to 6.0 V, with guaranteed VIH = 3.15 V and VIL = 1.35 V at VCC = 4.5 V, and VIH = 1.5 V at VCC = 2.0 V. When powered at 3.3 V, it meets standard 3.3 V CMOS thresholds and interfaces cleanly with 3.3 V microcontrollers and FPGAs.

Does the 74HC393DB,112 require external pull-up or pull-down resistors on its inputs?

No - the inputs include integrated clamp diodes, enabling direct connection to voltages above VCC when used with appropriate current-limiting resistors. For standard CMOS-level signals within the VCC range, no external biasing is needed; the device has negligible input leakage (<0.1 μA) and defined VIH/VIL thresholds across temperature and supply.