Texas Instruments CDC337DW

Overview

CDC337DW from Texas Instruments is a high-performance, low-skew clock driver IC designed for synchronized clock distribution and generation. It distributes one TTL-compatible clock input to eight CMOS-compatible outputs-four at full input frequency (Y1–Y4) and four at half-frequency (Q1–Q4)-with ±0.9 ns output skew, –48 mA/48 mA drive strength, and operation from –40°C to 85°C. Used in telecom timing backplanes and industrial control logic synchronization.

For engineers reviewing the CDC337DW datasheet, CDC337DW pinout, CDC337DW application, or CDC337DW equivalent, this page delivers verified electrical specs, functional truth table behavior, SOIC-20 package layout, thermal and timing limits, and validated drop-in alternatives for clock tree design and legacy system refresh.

Technical Context

The CDC337DW implements a dual-output clock divider architecture with asynchronous clear (CLR) and 3-state output enable (OE), enabling precise phase-aligned distribution of both f_CLK and f_CLK/2 signals. Its EPIC-II^B BiCMOS process ensures low power dissipation while maintaining TTL-level inputs and CMOS-level outputs.

It supports 80 MHz maximum input clock frequency, exhibits ≤9 ns propagation delay (t_PLH/t_PHL) under 50 pF load, and guarantees ≤0.9 ns output skew between Y/Q outputs relative to CLK↑-critical for minimizing jitter in synchronous digital systems.

Key Specifications

Pinout & Package

Package: SOIC-20 (DW), JEDEC MS-013 compliant, 0.300-inch body width, 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 SN74ACT1073DW and CDCLVC1107PW, the CDC337DW uniquely combines 5-V tolerant TTL inputs, integrated half-frequency generation, 3-state control, and sub-nanosecond skew-making it irreplaceable in legacy 5-V clock distribution systems requiring deterministic dual-rate timing.

Availability

CDC337DW is available at Aetrix Electronics and suitable for telecom line card timing, industrial PLC backplane sync, and test equipment pattern generation requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.

Supply support for CDC337DW 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 global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in precision timing and industrial-grade ICs.

The CDC337DW belongs to TI's legacy clock driver product line, engineered specifically for high-reliability 5-V clock distribution in telecom infrastructure, industrial automation, and test instrumentation-prioritizing low skew, robust drive, and thermal stability.

FAQ

What is the maximum clock frequency supported by the CDC337DW?

The CDC337DW supports a maximum input clock frequency of 80 MHz under recommended operating conditions (V_CC = 4.75 V to 5.25 V, T_A = –40°C to 85°C). This rating is verified per TI's SCAS330B datasheet timing specifications and applies to both Y and Q output families. Exceeding 80 MHz may result in increased skew, setup/hold violations, or metastability in the internal divider latch. The CDC337DW maintains guaranteed t_PLH/t_PHL ≤ 9 ns and t_sk(o) ≤ 0.9 ns up to this limit.

Does the CDC337DW require external pull-up or pull-down resistors on its inputs?

No, the CDC337DW does not require external pull-up or pull-down resistors on CLK, OE, or CLR inputs under normal operation. Its TTL-compatible inputs have defined VIH (≥2.0 V) and VIL (≤0.8 V) thresholds, and internal input structures ensure stable logic levels when driven. However, TI's datasheet Note 3 states that unused inputs must be held high or low-so floating OE or CLR pins must be terminated to V_CC or GND to prevent erratic output behavior. The CDC337DW itself contains no internal weak terminations.

Can the CDC337DW generate independent clock phases (e.g., 90° or 180° offset)?

No, the CDC337DW cannot generate quadrature or inverted-phase clocks. Its architecture produces only two fixed timing relationships: Y1–Y4 outputs are in-phase with CLK, and Q1–Q4 outputs toggle on every CLK rising edge-yielding exact 50% duty-cycle, half-frequency signals with no programmable phase shift. There is no provision for delayed, inverted, or fractional-phase outputs. For phase-adjustable clock distribution, a dedicated PLL-based device such as the CDC3243 or LMK04832 would be required instead of the CDC337DW.

Is the CDC337DW pin-compatible with other TI clock drivers in SOIC-20 packages?

The CDC337DW is not universally pin-compatible with other TI SOIC-20 clock drivers. While it shares the DW package outline, pin assignments differ significantly-for example, SN74ACT1073DW places OE on Pin 1 (not Pin 5), and CDCLVC1107PW uses Pins 1/2 for V_CC/GND rather than Y1/Y2. The CDC337DW's unique pinout (e.g., CLK on Pin 16, distributed V_CC/GND on Pins 2/4/7/9/12/14/15/17/19) is specific to its dual-output architecture. Direct substitution requires schematic and layout verification.

What is the meaning of "EPIC-II^B BiCMOS" in the CDC337DW datasheet?

"EPIC-II^B BiCMOS" refers to Texas Instruments' proprietary silicon process technology used to fabricate the CDC337DW. It integrates bipolar transistors for high-speed switching with CMOS structures for low static power-achieving both 80 MHz operation and reduced ICC versus pure bipolar drivers. This process enables the CDC337DW's key specs: ±48 mA drive, ≤0.9 ns skew, and 70–85 mA ICC across operating conditions. EPIC-II^B is a trademarked TI process, not a generic BiCMOS variant.