Renesas 85222AM-02LFT

Overview

85222AM-02LFT from Renesas Electronics (formerly IDT) is a 1-to-2 LVCMOS/LVTTL-to-differential HSTL clock translator with one single-ended input and two differential HSTL output pairs, operating at up to 350 MHz on a 3.3 V supply, used in high-speed memory interfaces and FPGA clock distribution.

For engineers reviewing the 85222AM-02LFT datasheet, 85222AM-02LFT pinout, 85222AM-02LFT application, or 85222AM-02LFT equivalent, key selection criteria include part-to-part skew ≤250 ps, propagation delay ≤1.25 ns, HSTL output crossover voltage (0.68–0.9 V), and SOIC-8 lead-free RoHS compliance.

Technical Context

The 85222AM-02LFT implements a single-input, dual-output translation architecture converting LVCMOS/LVTTL logic levels to HSTL-compatible differential outputs. It features internal CLK pulldown resistors (51 kΩ typical) and requires 50 Ω termination to ground on all outputs.

Its timing behavior is characterized by deterministic propagation delay (0.85–1.25 ns), tight output skew (≤25 ps), and part-to-part skew ≤250 ps - critical for synchronous DDR memory subsystems and multi-FPGA clock fanout where phase alignment across devices matters.

Key Specifications

Pinout & Package

85222AM-02LFT is housed in an 8-pin SOIC package (JEDEC MS-012, M suffix), lead-free and RoHS compliant, with 1.27 mm pitch and 3.90 mm × 4.92 mm body dimensions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICS85222AM-01LFT and PI6C557-03LEX, the 85222AM-02LFT uniquely supports LVCMOS/LVTTL inputs at 350 MHz in an 8-pin SOIC, making it optimal for space-constrained DDR3 and FPGA designs requiring direct microcontroller clock interfacing.

Availability

85222AM-02LFT is available at Aetrix Electronics and suitable for DDR3 memory subsystems, FPGA-based prototyping platforms, and industrial network switch timing applications requiring stable component supply and long-term manufacturability.

Supply support for 85222AM-02LFT 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

Renesas Electronics Corporation is a global semiconductor leader formed from the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, power, and timing solutions.

The 85222AM-02LFT belongs to Renesas' HiPerClockS™ timing portfolio, designed specifically for high-speed, low-skew clock distribution in memory interfaces and programmable logic systems.

FAQ

What is the maximum operating frequency supported by the 85222AM-02LFT?

The 85222AM-02LFT supports a maximum output frequency of 350 MHz, verified under VDD = 3.3 V ±5% and TA = 0°C to +70°C conditions. This rating applies to both Q0/nQ0 and Q1/nQ1 output pairs when properly terminated with 50 Ω to ground, as specified in the AC Characteristics table of the official datasheet revision B.

Does the 85222AM-02LFT require external pull-up or pull-down resistors on the CLK input?

No, the 85222AM-02LFT includes an internal 51 kΩ pulldown resistor on the CLK pin, eliminating the need for external biasing components. This feature simplifies layout and ensures defined logic states during power-up or when the clock source is tri-stated, as confirmed in Table 2 (Pin Characteristics) of the 85222-02 datasheet.

How should unused output pins be handled on the 85222AM-02LFT?

Unused differential output pairs on the 85222AM-02LFT must be terminated with 50 Ω to ground, per the "Recommendations for Unused Output Pins" section of the datasheet. Leaving outputs unterminated risks signal reflection, increased EMI, and potential instability in adjacent active outputs - especially critical at frequencies up to 350 MHz.

What is the guaranteed part-to-part skew specification for the 85222AM-02LFT?

The 85222AM-02LFT guarantees a maximum part-to-part skew of 250 ps, defined as the timing difference between identical output crossing points across separate devices under equal supply voltage and load conditions. This parameter is measured per JEDEC Standard 65 and appears in Table 4 (AC Characteristics) of the official datasheet.

Is the 85222AM-02LFT compatible with DDR3 SDRAM clocking requirements?

Yes, the 85222AM-02LFT delivers HSTL Class I-compliant outputs (crossover voltage 0.68–0.9 V, swing 0.6–1.4 V, VOH ≤1.4 V) and supports 350 MHz operation - fully meeting JEDEC DDR3 clock interface specifications. Its low skew and deterministic delay make it suitable for driving DDR3 memory controller clock inputs directly.