MASC-37446 - Quad 25.78/28.05Gbps CDR | MACOM
MPN: MASC-37446 ✗ End of Life| Qty | Unit Price | Extended |
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| 500 | $0 | $0.00 |
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MASC-37446 Overview
A clock and data recovery IC is a semiconductor that reconstructs a usable clock from a serial data stream and aligns data to that recovered timing reference. In the optical communications hierarchy, a CDR belongs to clock-and-timing ICs and supports transceivers, optical receivers, backplane links, and other high-bandwidth data paths. Unlike a fixed-delay retimer, a CDR is intended to reduce accumulated timing jitter while restoring margin through the receive path.
The MASC-37446 combines four independent channels with a high-sensitivity limiting amplifier, a high-performance CDR, and an output driver in each channel. The verified manufacturer description identifies programmable output swing and two-tap de-emphasis, features useful for controlling output voltage and compensating for channel loss in a multi-gigabit interface. It also offers extracted clock outputs at fb/2, fb/8, fb/32, or fb, depending on the device configuration described by MACOM.
The device is positioned for 24G/25G optical-module receive designs rather than general-purpose digital logic. Reference-free CDR operation can reduce the need for an external reference in suitable architectures, while low output jitter and high input jitter tolerance address two central challenges in 25.78/28.05 Gbps links. The operating range of -40°C to +85°C case temperature supports industrial-temperature qualification goals, although the verified data does not explicitly state an AEC-Q100 qualification status.
Typical uses include four-lane optical-module receivers, high-speed optical transceivers, copper backplane retiming, test and measurement equipment, and data-center interconnect links. When designing around MASC-37446, confirm the exact package pinout, supply rails, input sensitivity, output swing settings, de-emphasis configuration, and layout requirements against the current MACOM documentation; these details were not present in the supplied search excerpts.
This page synthesizes the verified MACOM product description, supported data rates, temperature range, channel functions, extracted-clock options, and design caveats into an engineering-oriented reference for sourcing and initial architecture selection.
Drop-in alternatives for MASC-37446 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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Request AlternativesMASC-37446 Specifications
| Product Type | Four-channel clock and data recovery IC with integrated limiting amplifier |
| Number of Channels | 4 channels |
| Supported Retiming Rate 1 | 25.78 Gbps |
| Supported Retiming Rate 2 | 27.95 Gbps |
| Supported Retiming Rate 3 | 28.05 Gbps |
| Nominal Application Data Rate | 24G/25G class |
| Case Temperature Range | -40°C to +85°C |
| Channel Input Stage | High-sensitivity limiting amplifier |
| Recovered Clock Output Options | fb/2, fb/8, fb/32 or fb |
| Output Swing | Programmable |
| De-emphasis | 2-tap |
| Architecture | Reference-free CDR |
| Jitter Performance | Low output jitter and high input jitter tolerance |
| Power | Low power |
| RoHS Status | unknown |
| REACH Status | unknown |
MASC-37446 -40°c to +85°c Pin Configuration Guide
Pin configuration for MASC-37446 (-40°c to +85°c package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for MASC-37446.
Refer to the datasheet for full pin configuration.
Typical Applications
MASC-37446 is suitable for 6 applications: Four-Lane Optical Module Receiver, High-Speed Optical Transceiver, High-Speed Backplane Interface, Data-Center Interconnect, Optical Communications Test Equipment, Industrial High-Speed Control and Monitoring.
Four-Lane Optical Module Receiver
MASC-37446 fits four-lane optical receive designs because it combines four independent channels with integrated limiting amplifiers and CDR functions. Each channel supports retiming at 25.78 Gbps, 27.95 Gbps, or 28.05 Gbps, allowing the receiver to recover data from high-speed optical-module signals. The programmable output swing and two-tap de-emphasis can be used to tune the electrical interface toward downstream circuitry, while extracted clock outputs at fb/2, fb/8, fb/32, or fb provide flexible timing references. The designer must confirm lane skew, optical sensitivity, supply rails, and thermal performance in the exact package and system configuration.
Recommended
High-Speed Optical Transceiver
The MASC-37446 is appropriate for the receive side of a high-speed optical transceiver where incoming serial data must be retimed before reaching a digital or mixed-signal processing block. Its four-channel structure reduces the number of separate recovery functions in a multi-lane module, while the integrated limiting amplifier conditions each incoming signal. The three verified rates—25.78 Gbps, 27.95 Gbps, and 28.05 Gbps—are closely aligned with 24G/25G optical-link engineering. Integration can simplify board planning, but only after the module designer verifies package dimensions, power delivery, trace impedance, and channel-level signal integrity.
Recommended
High-Speed Backplane Interface
MASC-37446 can be evaluated for backplane or board-to-board links that require four parallel 25.78 Gbps-class channels and recovered timing. The CDR role is to re-align data to a recovered clock and reduce the impact of accumulated timing distortion. Programmable output swing and two-tap de-emphasis may help control signal amplitude and compensate for high-frequency channel loss, although the exact implementation depends on the transmitter and receiver architecture. Designers should compare the device against electrical retimers using verified jitter, latency, power, package, and channel-skew specifications rather than assuming compatibility.
Recommended
Data-Center Interconnect
The four-channel architecture makes MASC-37446 a candidate for data-center interconnect links that need deterministic receive-side timing recovery across several high-speed lanes. The 25.78 Gbps, 27.95 Gbps, and 28.05 Gbps retiming options can support different link rates within the 24G/25G class identified by MACOM. Its integrated limiting amplifier and CDR may reduce the number of external receive conditioning blocks, while low output jitter and high input jitter tolerance are relevant to margin. Final selection requires system-level analysis of loss, lane skew, power consumption, thermal rise, and signal integrity with the exact MACOM documentation.
Recommended
Optical Communications Test Equipment
MASC-37446 may be useful in high-speed optical communications test equipment where four recovered data channels and selectable extracted clock outputs simplify synchronization between instrumentation and a device under test. The fb/2, fb/8, fb/32, or fb clock options can provide different timing relationships for downstream measurement blocks. The device’s integrated limiting amplifier can also reduce the receive-chain footprint in compact test fixtures. Before adoption, verify output amplitude, clock-output jitter, input sensitivity, package height, and thermal conditions because the supplied search excerpts do not include those electrical or mechanical limits.
Recommended
Industrial High-Speed Control and Monitoring
MASC-37446 can be evaluated for industrial equipment that communicates over multiple high-speed optical or copper lanes while operating across a -40°C to +85°C case-temperature range. The integrated four-channel CDR and limiting-amplifier architecture may reduce board area compared with discrete recovery stages, and programmable output swing provides some interface-control flexibility. Industrial suitability still depends on the enclosure temperature, airflow, PCB thermal design, isolation requirements, and system qualification. Confirm the exact package, supply rails, ESD requirements, reliability documentation, and any applicable regulatory or automotive requirements before using it outside the verified application description.
Recommended
Engineering reference data for MASC-37446 — comparison, design guidance, and compliance information.
Selection Guide
Key Differentiators
- Four-channel integration in one receive device (vs Single-channel CDR alternatives)
- Integrated limiting amplifier and CDR (vs Discrete limiting amplifier plus retimer implementations)
- Multiple supported retiming rates (vs CDRs supporting only one fixed line rate)
Design Notes
Confirm the exact package pin assignment and differential-routing requirements from the current MACOM documentation before layout. The supplied excerpts identify integrated limiting amplifiers and programmable output swing, but they do not provide differential impedance, pin grouping, or trace-length constraints. Use the manufacturer’s reference layout and controlled-impedance PCB rules rather than a generic CDR footprint.
Calculate the complete receive-channel power budget only after obtaining the exact supply-voltage and current specifications from MACOM. A four-channel CDR can consume substantially more power than a single-channel retimer, so estimate worst-case dissipation across all channels and include limiting-amplifier and output-driver loads. Confirm whether the package has an exposed thermal pad and follow the manufacturer’s land pattern and thermal-via recommendations.
Do not treat MASC-37446 and MASC-37446A as interchangeable without an ordering-code or datasheet check. The verified search excerpt uses the MASC-37446 page while describing MASC-37446A, but it does not establish whether the suffix represents a revision, temperature grade, package variant, or another device version. Also verify whether all extracted-clock choices are available in the selected configuration.
Compliance Information
The verified excerpts provide a -40°C to +85°C case-temperature range but do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Verify compliance for the exact ordering code and package with MACOM.
