Nexperia USA Inc. 74HCT6323AD,118

Overview

74HCT6323AD,118 from Nexperia is a programmable 3-stage ripple counter with integrated crystal oscillator and 3-state output buffer, designed for third-overtone crystal operation up to 50 MHz at VCC = 5 V ± 10%. It features asynchronous master reset (MR), dual mode-select inputs (S1/S2) for divide-by-1/2/4/8, on-chip 7 pF capacitors per oscillator pin, and TTL-level input compatibility. Used in compact timing modules requiring stable frequency division without external oscillator components.

For engineers reviewing the 74HCT6323AD,118 datasheet, 74HCT6323AD,118 pinout, 74HCT6323AD,118 application, or 74HCT6323AD,118 equivalent, this device serves as a self-contained clock generator and programmable divider for space-constrained industrial timers, control counters, and CIO (Compact Integrated Oscillator) designs where crystal-based accuracy and low external component count are critical.

Technical Context

The device integrates a Pierce-type oscillator configurable for fundamental or third-overtone crystal operation, with internal 7 pF load capacitors enabling third-overtone startup without external caps. Its 3-stage binary ripple counter advances on the negative-going edge of X1 and supports four fixed division ratios via S1/S2 logic states.

MR provides asynchronous reset, halting oscillation and forcing OUT into high-impedance state; MR has an internal pull-up, allowing floating operation. X1 accepts either crystal drive or external TTL-compatible clock (with pull-up), while X2 must float when external clock is used.

Key Specifications

Pinout & Package

Package: SO8 (SOT96-1), plastic small outline, 8 leads, body width 3.9 mm, lead pitch 1.27 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC6323AD,118 and CD74HC4060M96, the 74HCT6323AD,118 uniquely combines TTL-compatible inputs, hardware-programmable division, and 3-state output in an SO8 footprint - making it optimal for upgrade paths and resource-constrained embedded timing.

Availability

74HCT6323AD,118 is available at Aetrix Electronics and suitable for industrial timer modules, automotive engine control units, Compact Integrated Oscillator (CIO) designs, and legacy system clock upgrades requiring stable component supply across extended temperature ranges.

Supply support for 74HCT6323AD,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 focused on high-volume, high-reliability logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74HCT6323A belongs to Nexperia's HC/HCT logic family, engineered specifically for robust, low-component-count timing subsystems in harsh environments - emphasizing oscillator integration, wide temperature operation, and direct TTL interoperability.

FAQ

Can 74HCT6323AD,118 operate with a 1 MHz fundamental-mode crystal?

Yes - the device supports fundamental-mode crystal operation from 1 MHz to 25 MHz. Figure 9 shows the recommended configuration: 100 kΩ to 1 MΩ bias resistor (Rbias), 22–37 pF load capacitors (C1/C2), and 2.2 kΩ power-limiting resistor (R2). The internal 7 pF capacitors contribute to total load capacitance, simplifying tuning.

What happens if S1 and S2 are left unconnected?

When S1 and S2 float, internal leakage and input structure bias them toward HIGH, resulting in divide-by-8 operation per functional description Table 3. This is the default safe state for systems where division ratio is not actively controlled - ensuring predictable clock reduction without external pull resistors.

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

Yes - apply external clock to X1 while leaving X2 floating. X1 accepts TTL-level signals: VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5 V. A pull-up resistor to VCC is required if driving from open-collector or low-drive sources. Rise/fall times must be ≤6 ns for reliable operation up to 85 MHz.

How does the master reset (MR) affect oscillator startup time?

MR is asynchronous and immediately halts oscillation and resets the counter. After MR returns HIGH, oscillator startup time depends on crystal type and external components - typically 1–10 ms for third-overtone crystals. No internal power-on delay is added; the external RC network on MR (Figure 15) is optional for system-level reset sequencing.