Nexperia USA Inc. 74HCT6323AD/C4J

Overview

74HCT6323AD/C4J from Nexperia is a programmable 3-stage ripple counter with integrated crystal oscillator and 3-state output buffer, operating in fundamental or third-overtone mode up to 50 MHz at VCC = 5 V ±10%. It features TTL-compatible inputs, asynchronous master reset (MR), and selectable divide-by-1/2/4/8 modes via S1/S2 pins. Used in compact timing modules requiring stable frequency division without external oscillators.

For engineers reviewing the 74HCT6323AD/C4J datasheet, 74HCT6323AD/C4J pinout, 74HCT6323AD/C4J application, or 74HCT6323AD/C4J equivalent, key selection criteria include third-overtone crystal support, MR-driven oscillator stop function, 3-state output timing control, and SO8 package compatibility with industrial temperature range (-40 °C to +125 °C).

Technical Context

The device integrates a Pierce-type oscillator with two on-chip 7 pF capacitors optimized for third-overtone crystal operation (e.g., ~50 MHz), eliminating need for external load caps in many configurations. The 3-stage binary ripple counter advances on the negative-going edge of X1 and supports four fixed division ratios selected by S1/S2 logic levels.

MR is an active-low asynchronous input that simultaneously resets the counter, disables the oscillator, and places OUT in high-impedance state; internal pull-up allows floating MR to remain inactive. X1 accepts either crystal-derived or external clock signals, while X2 must float when external clock is applied.

Key Specifications

Pinout & Package

Package: SO8 plastic small outline package (SOT96-1), 8 leads, body width 3.9 mm, lead pitch 1.27 mm, compliant with JEDEC MS-012.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable oscillator+counter applications.

Compared with 74HC6323AD and CD74HC4060M96, the 74HCT6323AD/C4J uniquely combines TTL compatibility, factory-trimmed third-overtone oscillator support, and 3-state output in a single SO8 package-enabling drop-in replacement of discrete oscillator+divider solutions in industrial and automotive timing modules.

Availability

74HCT6323AD/C4J is available at Aetrix Electronics and suitable for industrial timer modules, automotive engine control units, compact integrated oscillators, and medical infusion pump controllers requiring stable component supply across extended temperature ranges.

Supply support for 74HCT6323AD/C4J 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 specializing in high-performance logic, analog, and MOSFET solutions, with leadership in automotive-grade reliability and industrial power efficiency.

The 74HCT6323A product line delivers integrated oscillator+counter functionality targeting space-constrained, high-reliability timing applications in automotive, industrial automation, and medical electronics.

FAQ

Can 74HCT6323AD/C4J operate with a fundamental-mode crystal?

Yes - the device supports both fundamental and third-overtone crystal operation. For fundamental mode (e.g., 1–25 MHz), use external load capacitors (C1/C2) and bias resistor (Rbias ≈ 100 kΩ to 10 MΩ) per Figure 9. Internal 7 pF caps are insufficient alone for fundamental startup but contribute to total node capacitance.

What happens to the oscillator when MR is asserted?

When MR is driven LOW, the oscillator stops immediately, the 3-stage counter resets to zero, and the OUT pin enters high-impedance state. Oscillation resumes within t_rec (max 30 ns at VCC = 4.5 V) after MR returns HIGH, provided X1/X2 connections and crystal conditions remain valid.

Is external clock input supported, and what are the requirements?

Yes - apply external clock to X1 while leaving X2 floating. Input must meet TTL thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 5 V), have rise/fall times ≤ 6 ns, and drive capability sufficient for CMOS input capacitance (CI = 3.5 pF). MR must remain HIGH for normal counter operation.

How does the device handle third-overtone crystal startup without external components?

On-chip 7 pF capacitors at X1 and X2 combine with typical PCB stray capacitance (~5 pF each) to yield ~12 pF total node capacitance - matching common third-overtone crystal load requirements (e.g., 12 pF or 15 pF). This eliminates external load caps for many 50 MHz overtone crystals, as validated in Figure 10 and Table 10.