Texas Instruments CDC341DW

Overview

CDC341DW from Texas Instruments is a 1-line-to-8-line clock driver IC designed for low-skew clock distribution in synchronous digital systems. It features TTL-compatible inputs/outputs, ±48-mA high-drive capability, and distributes a single clock input (A) to eight outputs (1Y1–1Y4, 2Y1–2Y4) with output skew ≤0.5 ns and pulse skew ≤0.9 ns. It operates across 0°C to 70°C with 4.75–5.25 V supply and supports up to 80 MHz (one bank loaded).

For engineers reviewing the CDC341DW datasheet, CDC341DW pinout, CDC341DW application, or CDC341DW equivalent, key selection considerations include its dual-gated 8-output architecture, factory-trimmed propagation delay via P0/P1 (not user-accessible), distributed VCC/GND pins for noise reduction, and SOIC-20 package compatibility with legacy TTL timing systems.

Technical Context

The CDC341DW implements a dual-bank (1Y and 2Y) clock distribution architecture controlled by independent enable pins (1G and 2G), allowing selective disabling of either four-output group to logic-low regardless of input A state. Its EPIC-II B BiCMOS process enables high-speed switching while limiting ICC to 3.5 mA (all outputs high) and 33 mA (all outputs low).

Propagation delays (tPLH/tPHL = 3.1–4.9 ns) are tightly controlled across temperature (±41–52 ps/10°C drift) and supply voltage (±20–28 ps/100 mV drift), and output skew is specified at ≤0.5 ns (tsk(o)) under CL = 50 pF. P0 and P1 pins are factory-set trim points and must be strapped to GND - they serve no functional role in end-user circuit design.

Key Specifications

Pinout & Package

Package: SOIC-20 (DW), 7.5 mm × 12.8 mm body, 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar clock-driver applications.

Compared with SN74ACT164245DGGR and CD74ACT112M, the CDC341DW uniquely delivers guaranteed low-skew, high-drive, dual-gated clock distribution in a single SOIC-20 package - neither alternative provides output skew control, bank-selectable gating, or TTL-compatible 8-output fanout.

Availability

CDC341DW is available at Aetrix Electronics and suitable for memory interface clocking, microcontroller peripheral distribution, FPGA configuration, and DSP synchronization requiring stable component supply and long-term commercial-grade availability.

Supply support for CDC341DW 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

Texas Instruments is a U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial and communications market reach.

The CDC341DW belongs to TI's legacy clock-driver product line, engineered specifically for low-skew, high-fanout 5-V TTL clock distribution in commercial-grade digital systems from the 1990s onward.

FAQ

What is the maximum clock frequency supported by the CDC341DW?

The CDC341DW supports up to 80 MHz when driving only one output bank (e.g., 1Y1–1Y4 or 2Y1–2Y4), and 40 MHz when both banks are simultaneously loaded. This limitation arises from increased capacitive loading and internal timing margins - exceeding these frequencies risks timing violations or degraded skew performance. The CDC341DW datasheet specifies these values under CL = 50 pF and recommended operating conditions.

Can the P0 and P1 pins on the CDC341DW be used for user calibration or adjustment?

No - the P0 and P1 pins on the CDC341DW are factory-trimmed calibration nodes for internal propagation delay adjustment and are not intended for end-user access. The datasheet explicitly states they "should be strapped to GND" and warns against connecting them to any active circuitry. Using them as configurable inputs or leaving them floating violates the device's validated operating conditions and may cause unpredictable timing behavior.

Does the CDC341DW support 3.3-V logic levels?

No - the CDC341DW is a 5-V TTL-compatible device with VIH ≥2 V and VIL ≤0.8 V, and it requires a 4.75–5.25 V supply. It does not support 3.3-V input thresholds or operate reliably below 4.75 V. For 3.3-V systems, a level-translating clock buffer such as the SN74LVC1G125 should be used upstream of the CDC341DW, or a modern 3.3-V clock driver selected instead.

How does the dual-enable architecture (1G and 2G) function in the CDC341DW?

The CDC341DW uses two independent active-low enable inputs: 1G controls outputs 1Y1–1Y4, and 2G controls outputs 2Y1–2Y4. When either enable is low, its associated four outputs are forced to logic-low regardless of the A input state - enabling dynamic clock gating per bank. This allows partial clock shutdown for power management without affecting other timing domains, a feature absent in single-enable clock drivers.

Is the CDC341DW pin-compatible with newer TI clock drivers like the LMK00301?

No - the CDC341DW is not pin-compatible with the LMK00301 or other modern clock buffers. The CDC341DW uses a 20-pin SOIC (DW) package with specific pin assignments including dual enables (1G/2G), factory-trim pins (P0/P1), and distributed VCC/GND. The LMK00301 uses a 32-pin WQFN package with different pinout, supply requirements (3.3 V), and advanced features like PLL-based jitter cleaning - no mechanical or electrical drop-in replacement exists.