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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Clock Buffers, Drivers

Renesas 889874AKLFT

Name: 889874AKLFT
Brand: Renesas
SKU: 889874AKLFT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 889874AKLFT

Manufacturer:: Renesas

Category:: Clock Buffers, Drivers

Package:: 16-VFQFN Exposed Pad

Datasheet:: 889874AKLFT.pdf

Description:: IC CLK BUFFER 1:2 2.5GHZ 16VFQFN

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Product details

Overview

ICS889874AKLFT from Integrated Circuit Systems is a 1:2 differential-to-LVPECL buffer/divider with selectable ÷1, ÷2, ÷4, ÷8, or ÷16 output division, dual LVPECL outputs (Q0/nQ0, Q1/nQ1), 5ps typical output skew, and support for LVPECL/LVDS/CML differential inputs. It operates across -40°C to +85°C and is used in high-speed clock distribution for telecom infrastructure and FPGA timing systems.

For engineers reviewing the ICS889874AKLFT datasheet, ICS889874AKLFT pinout, ICS889874AKLFT application, or ICS889874AKLFT equivalent, key selection criteria include its 2.5GHz max output frequency, internal 50Ω input termination, VFQFN-16 package compatibility, and programmable divider control via S0/S1/S2 pins.

Technical Context

The ICS889874AKLFT implements a synchronous divide-by-N counter architecture with a master reset (nRESET) and three-level binary control (S2/S1/S0) enabling precise frequency division. Its differential input stage accepts LVPECL, LVDS, and CML signals without external termination resistors due to integrated 50Ω on-chip resistors referenced to VT.

Each LVPECL output pair (Q0/nQ0, Q1/nQ1) delivers >2.5GHz bandwidth with matched propagation delay and <0.03ps RMS additive jitter. The device uses separate VCC (2.375–3.465V) and VEE (–3.465 to –2.375V) supplies to maintain ECL-compatible voltage levels while supporting both positive- and negative-rail LVPECL operation.

Key Specifications

Parameter	Value and Actual Design Meaning
Output configuration	Dual LVPECL differential output pairs (Q0/nQ0, Q1/nQ1) for fanout or divided clock distribution
Max output frequency	≥2.5GHz - supports high-speed SerDes, optical line cards, and multi-gigabit PHY interfaces
Divider options	÷1, ÷2, ÷4, ÷8, ÷16 - selected via S2/S1/S0 control pins; enables flexible clock tree synthesis
Input compatibility	LVPECL, LVDS, CML - enabled by internal 50Ω differential termination and wide common-mode range
Output skew	5ps typical - ensures tight timing alignment between Q0/nQ0 and Q1/nQ1 for parallel data paths
Supply voltage	VCC = 2.375–3.465V; VEE = –3.465 to –2.375V - supports standard LVPECL and ECL logic families
Operating temperature	–40°C to +85°C - qualified for industrial and telecom base station environments

Pinout & Package

ICS889874AKLFT is housed in a 3mm × 3mm × 0.95mm 16-lead Very Thin Quad Flat No-Lead (VFQFN) package with exposed thermal pad (K suffix), JEDEC MO-220 compliant.

Pin/Terminal	Circuit Role	Design Meaning
IN / nIN	Differential clock input	Accepts LVPECL/LVDS/CML; internally terminated to 50Ω; VT pin sets common-mode reference
Q0 / nQ0, Q1 / nQ1	Differential LVPECL outputs	Two independent buffered/divided outputs; require 50Ω termination to VCC–2V or ground
S0 / S1 / S2	Divider select inputs	Binary-coded control (S2 MSB) for ÷1/÷2/÷4/÷8/÷16; internal pull-ups enable default ÷1 if floating
nRESET	Asynchronous reset input	Active-low; resets internal dividers and forces outputs low; internal pull-up holds HIGH during normal operation
VCC / VEE	Power supply terminals	VCC powers LVPECL output drivers; VEE supplies internal ECL core; decoupling required per AC specs
VREF_AC / VT	AC reference & input termination bias	VREF_AC provides AC-coupled bias for differential inputs; VT sets termination common-mode point

Key Features

Feature	Design Value
Integrated 50Ω differential input termination	Eliminates four external resistors per input pair, reducing BOM count and PCB area in dense clock routing
Selectably programmable frequency division	Hardware-configurable ÷1–÷16 via S0/S1/S2 pins enables one device to serve multiple clock domain requirements
Sub-5ps output skew between channels	Enables simultaneous sampling of high-speed parallel buses (e.g., DDR memory interfaces, JESD204B lanes)
LVPECL output compliance with 2.5V/3.3V rails	Supports legacy ECL (-5.2V) and modern LVPECL (3.3V/2.5V) systems via dual-supply architecture
RoHS-compliant lead-free VFQFN-16 package	3mm × 3mm footprint meets space-constrained requirements in 1U servers, optical modules, and compact FPGA carrier boards

Applications

Telecom Line Card Timing	FPGA Clock Distribution
Use Scenario: Distributing and dividing a 156.25MHz reference clock across multiple SerDes lanes in a 10G/25G optical line card. IC Role / Device Role / Timing Role: Acts as a low-skew, programmable divider to generate synchronized 78.125MHz, 39.0625MHz, or 19.53125MHz clocks for PHY ICs. Use Value: Internal termination and 5ps skew ensure deterministic jitter accumulation across 16+ lanes, meeting ITU-T G.8262 ePRTC holdover requirements.	Use Scenario: Providing phase-aligned clock domains to multiple FPGA I/O banks and transceivers in a high-density compute accelerator. IC Role / Device Role / Timing Role: Buffers and divides a single high-frequency oscillator into multiple domain-specific clocks (e.g., PCIe, DDR4, AXI). Use Value: Dual outputs with matched delay allow concurrent clocking of memory controllers and high-speed serial interfaces without inter-bank skew penalties.
Network Switch ASIC Clocking	Test Equipment Signal Generation
Use Scenario: Driving clock inputs of multi-port Ethernet switch ASICs requiring precise 125MHz, 62.5MHz, or 31.25MHz timing across 48+ ports. IC Role / Device Role / Timing Role: Functions as a fanout buffer with optional division to match ASIC PLL input requirements and reduce jitter multiplication. Use Value: <0.03ps RMS additive jitter preserves signal integrity at 2.5GHz output, critical for maintaining BER <1e–12 in 100GbE KR4 links.	Use Scenario: Generating calibrated, low-jitter clock signals in automated test equipment (ATE) for validating high-speed ADCs/DACs. IC Role / Device Role / Timing Role: Provides traceable, repeatable clock sources with programmable division for stimulus generation and sampling synchronization. Use Value: Pin-selectable division eliminates need for external logic or FPGA-based clock management, accelerating test setup and improving measurement repeatability.

Telecom Line Card Timing

FPGA Clock Distribution

Use Scenario: Distributing and dividing a 156.25MHz reference clock across multiple SerDes lanes in a 10G/25G optical line card.

IC Role / Device Role / Timing Role: Acts as a low-skew, programmable divider to generate synchronized 78.125MHz, 39.0625MHz, or 19.53125MHz clocks for PHY ICs.

Use Value: Internal termination and 5ps skew ensure deterministic jitter accumulation across 16+ lanes, meeting ITU-T G.8262 ePRTC holdover requirements.

Use Scenario: Providing phase-aligned clock domains to multiple FPGA I/O banks and transceivers in a high-density compute accelerator.

IC Role / Device Role / Timing Role: Buffers and divides a single high-frequency oscillator into multiple domain-specific clocks (e.g., PCIe, DDR4, AXI).

Use Value: Dual outputs with matched delay allow concurrent clocking of memory controllers and high-speed serial interfaces without inter-bank skew penalties.

Network Switch ASIC Clocking

Test Equipment Signal Generation

Use Scenario: Driving clock inputs of multi-port Ethernet switch ASICs requiring precise 125MHz, 62.5MHz, or 31.25MHz timing across 48+ ports.

IC Role / Device Role / Timing Role: Functions as a fanout buffer with optional division to match ASIC PLL input requirements and reduce jitter multiplication.

Use Value: <0.03ps RMS additive jitter preserves signal integrity at 2.5GHz output, critical for maintaining BER <1e–12 in 100GbE KR4 links.

Use Scenario: Generating calibrated, low-jitter clock signals in automated test equipment (ATE) for validating high-speed ADCs/DACs.

IC Role / Device Role / Timing Role: Provides traceable, repeatable clock sources with programmable division for stimulus generation and sampling synchronization.

Use Value: Pin-selectable division eliminates need for external logic or FPGA-based clock management, accelerating test setup and improving measurement repeatability.

Equivalent & Alternatives

The following parts are listed as comparable options for similar differential clock buffer/divider applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SY89874U	Pin-compatible per datasheet; identical pinout and divider control logic; same VFQFN-16 package	Same functional scope but from Microchip (formerly Micrel); slightly higher typical additive jitter (0.035ps vs. 0.03ps)	Drop-in replacement where Microchip sourcing or qualification is preferred; verify layout compatibility with thermal pad soldering guidelines
ICS854S01I	Fixed ÷2 only; no S0/S1/S2 control; lower max frequency (2.1GHz); different pinout and package (TSSOP-20)	Limited to fixed-ratio division; requires PCB redesign and additional level-shifting for LVDS input compatibility	Consider only when ÷2-only function suffices and board space allows TSSOP-20; not suitable for multi-division clock trees

Compared with SY89874U, ICS889874AKLFT offers marginally lower additive jitter and ICS-specific HiPerClockS timing validation; compared with ICS854S01I, it delivers full programmability and higher frequency headroom at the cost of tighter layout constraints in VFQFN.

Availability

ICS889874AKLFT is available at Aetrix Electronics and suitable for telecom infrastructure, FPGA-based embedded systems, and high-speed test equipment requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for ICS889874AKLFT 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

Integrated Circuit Systems (ICS) was a fabless semiconductor company specializing in high-performance clock generation, distribution, and management ICs before its acquisition by IDT in 2015 and later by Renesas in 2019.

The ICS889874AKLFT belongs to the HiPerClockS™ family, designed specifically for low-jitter, high-frequency clock buffering and division in telecom, networking, and computing applications demanding sub-5ps skew and multi-GHz bandwidth.

FAQ

What is the maximum supported input frequency for ICS889874AKLFT?

The ICS889874AKLFT supports a maximum input frequency of 2GHz when configured for ÷1 operation, as specified in Table 5 under "Maximum Input Frequency" for ÷1 mode. At higher division ratios (e.g., ÷2, ÷4), the input frequency limit scales accordingly-up to 2GHz for ÷1, 1GHz for ÷2, and so on-ensuring reliable operation within the device's AC characterization envelope.

Does ICS889874AKLFT require external termination resistors on its differential inputs?

No, the ICS889874AKLFT does not require external termination resistors on its IN/nIN inputs. It integrates internal 50Ω differential termination resistors, as confirmed in the General Description and Table 2. This feature simplifies PCB layout and reduces component count, especially in space-constrained applications like optical modules and compact FPGA carriers.

How is the division ratio selected on ICS889874AKLFT?

The division ratio on ICS889874AKLFT is selected using three control pins: S2 (MSB), S1, and S0 (LSB). As shown in Table 3B, binary combinations determine the ratio: 000 = ÷1, 001 = ÷2, 010 = ÷4, 011 = ÷8, and 100 = ÷16. All control pins have internal pull-ups, so leaving them unconnected defaults to ÷1 operation.

Can ICS889874AKLFT operate with a 2.5V LVPECL supply?

Yes, the ICS889874AKLFT supports 2.5V LVPECL operation. Table 4A specifies VCC = 2.5V ±5% as a valid supply condition, and Figures 7A–7C detail recommended 2.5V LVPECL output terminations (e.g., 50Ω to ground). The device maintains full AC performance-including 2.5GHz output capability and <0.03ps jitter-at this voltage.

Is ICS889874AKLFT pin-compatible with any alternative devices?

Yes, the ICS889874AKLFT is explicitly stated as pin-compatible with SY89874U in Table 12 of the datasheet. Both share identical VFQFN-16 pinout, power connections, control pin assignments, and differential I/O placement-enabling direct substitution without PCB modification, provided thermal and signal integrity constraints are met.

889874AKLFT Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 16-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Fanout Buffer (Distribution), Divider, Multiplexer

Number of Circuits:: 1

Ratio - Input:Output:: 1:2

Differential - Input:Output:: Yes/Yes

Input:: CML, LVDS, LVPECL

Output:: LVPECL

Frequency - Max:: 2.5 GHz

Voltage - Supply:: 2.375V ~ 3.63V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 16-VFQFN (3x3)

889874AKLFT FAQ

1.How can I place an order for 889874AKLFT through Aetrix?

Please submit a Request for Quotation (RFQ) for 889874AKLFT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 889874AKLFT reliable?

The price and inventory of 889874AKLFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 889874AKLFT is usually 5 days.

3.What payment methods are accepted for 889874AKLFT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 889874AKLFT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 889874AKLFT?

889874AKLFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 889874AKLFT order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 889874AKLFT?

For technical support, including 889874AKLFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 889874AKLFT requirements.

6.How does Aetrix verify that 889874AKLFT is sourced from the original manufacturer or authorized distributors?

All 889874AKLFT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 889874AKLFT meets industry standards.

7.What is the process for return or replacement of 889874AKLFT?

All 889874AKLFT units undergo pre-shipment inspection (PSI). If there is an issue with 889874AKLFT, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 889874AKLFT part is unused and in its original packaging.

Return procedure for 889874AKLFT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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