Nexperia USA Inc. 74HCT393PW,112

Overview

74HCT393PW,112 from Nexperia is a dual 4-bit binary ripple counter IC with TTL-compatible inputs, operating from 4.5 V to 5.5 V. It features two independent asynchronous master reset inputs (1MR, 2MR), two edge-triggered clock inputs (1CP, 2CP), and eight buffered outputs (1Q0–1Q3, 2Q0–2Q3). The device 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 event counting circuits.

For engineers reviewing the 74HCT393PW,112 datasheet, 74HCT393PW,112 pinout, 74HCT393PW,112 application, or 74HCT393PW,112 equivalent, this device is selected for precise binary division (÷2 to ÷16 per counter), low-power synchronous logic interfacing, and industrial control systems requiring robust noise immunity and wide temperature operation (−40 °C to +125 °C).

Technical Context

The 74HCT393PW,112 implements two independent 4-stage ripple counters using T-type flip-flops cascaded in series. Each counter advances on the falling edge of its dedicated clock input and resets asynchronously via its own active-HIGH master reset line - enabling independent control of divide-by-N sequences up to 2⁴ = 16 per channel. No internal synchronization between counters is provided.

Input thresholds are TTL-compatible (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V), ensuring direct interfacing with legacy 5 V logic families. Output drive capability is ±4 mA at VCC = 4.5 V, with VOH ≥ 3.98 V and VOL ≤ 0.26 V under load - supporting reliable fan-out to multiple CMOS or TTL inputs.

Key Specifications

Pinout & Package

TSSOP14 plastic thin shrink small outline package (SOT402-1); 14 leads; body width 4.4 mm; lead pitch 0.65 mm; exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC393PW,112 and SN74LS393N, the 74HCT393PW,112 uniquely balances TTL input compatibility, low static current (<160 μA), and 48 MHz operation - making it optimal for new 5 V embedded designs requiring reliability, efficiency, and ease of integration.

Availability

74HCT393PW,112 is available at Aetrix Electronics and suitable for industrial timer modules, digital event counters, frequency divider banks, and legacy system interface circuits requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT393PW,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 delivering high-performance, reliable logic, analog, and MOSFET solutions optimized for efficiency, miniaturization, and robustness in industrial and automotive applications.

The 74HCT393 forms part of Nexperia's industry-standard 74HCT logic family, designed specifically for seamless 5 V TTL-to-CMOS interfacing in space-constrained, thermally demanding embedded systems.

FAQ

Can the two counters be synchronized to share a common clock input?

No - the 74HCT393PW,112 has two physically separate clock inputs (1CP and 2CP) with no internal routing or synchronization logic. To align counting phases, external gating or a shared clock signal must be applied to both pins simultaneously using matched trace lengths and proper termination to avoid skew-induced metastability.

What is the maximum fan-out achievable from a single Q-output?

Each Q-output can drive up to 10 standard 74HCT inputs (based on ±4 mA output current and 40 μA input leakage), or up to 20 74HC inputs. For heavier loads (e.g., LEDs or transmission lines), external buffer drivers are required to maintain timing integrity and voltage margins.

Does the device support dynamic supply voltage scaling during operation?

No - the 74HCT393PW,112 is characterized and guaranteed only within the recommended operating range of 4.5 V to 5.5 V. Operation below 4.5 V risks unreliable TTL-level recognition (VIH/VIL margins collapse), and above 5.5 V violates absolute maximum ratings and may cause accelerated parametric drift or failure.

How does the ripple architecture affect timing accuracy in cascaded stages?

Ripple propagation introduces cumulative delay: t_pd(1CP→1Q3) ≈ 4 × t_pd(nQx→nQ(x+1)) = ~38 ns max at VCC = 4.5 V. This limits maximum usable clock frequency in multi-stage chains and requires careful setup/hold analysis when feeding 1Q3 into another counter's clock - synchronous alternatives like 74HCT163 should be considered for critical timing paths.