Renesas 85222AM-01LF

Overview

The 85222AM-01LF from Renesas Electronics (formerly IDT) is a dual-channel LVCMOS/LVTTL-to-differential HSTL clock translator IC used for high-speed clock distribution in memory interfaces and FPGA/ASIC timing subsystems. It accepts two single-ended LVCMOS or LVTTL clock inputs (CLK0, CLK1), translates them to complementary HSTL differential outputs (Q0/nQ0, Q1/nQ1), supports up to 350 MHz output frequency, operates at 2.5 V or 3.3 V supply, and delivers ≤1075 ps max propagation delay with ≤375 ps part-to-part skew.

For engineers reviewing the 85222AM-01LF datasheet, 85222AM-01LF pinout, 85222AM-01LF application, or 85222AM-01LF equivalent, this page provides verified technical context, package mapping, real-world design implications of HSTL translation, and validated alternative options for memory interface clocking systems requiring low skew and dual-output synchronization.

Technical Context

The 85222AM-01LF implements a fully static, non-latching dual-channel translation architecture with internal pull-up resistors (51 kΩ) on both CLK0 and CLK1 inputs, enabling direct connection to LVCMOS/LVTTL sources without external biasing. Each channel drives a matched differential HSTL output pair terminated into 50 Ω to ground, delivering controlled voltage swing (0.45–1.4 V peak-to-peak) and duty cycle stability across 45–55% up to 350 MHz.

It operates across two supply domains-2.5 V ±5% and 3.3 V ±5%-with identical AC performance specifications except for increased propagation delay (1200 ps max) and part-to-part skew (475 ps max) at 2.5 V. Input thresholds are defined relative to VDD (VIH ≥ 2 V, VIL ≤ 1.3 V), and outputs comply with JEDEC Standard 65 for HSTL Class I timing behavior.

Key Specifications

Pinout & Package

85222AM-01LF is housed in an 8-pin SOIC package (M suffix), measuring 3.90 mm × 4.92 mm × 1.37 mm, with JEDEC MS-012 compliant dimensions and lead-free RoHS-compliant finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 85222AM-01LF, the 85222AM-01LFT offers identical performance in tape-and-reel format for high-volume manufacturing, while the 85222AM-01 provides the same functionality without RoHS compliance-making the LF variant the default choice for new designs requiring environmental conformance.

Availability

85222AM-01LF is available at Aetrix Electronics and suitable for DDR2 memory interfaces, FPGA clock distribution, ASIC timing subsystems, and high-speed test equipment requiring stable component supply and guaranteed long-term sourcing.

Supply support for 85222AM-01LF 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 for automotive, industrial, and infrastructure markets.

The 85222AM-01LF belongs to Renesas' high-performance clock translation product line, designed specifically for low-skew, dual-output HSTL clock distribution in memory-intensive systems such as DDR2/DDR3 controllers and FPGA-based compute accelerators.

FAQ

What is the maximum operating frequency supported by the 85222AM-01LF?

The 85222AM-01LF supports a maximum output frequency of 350 MHz under both 2.5 V and 3.3 V supply conditions, as confirmed in Tables 4A and 4B of the official datasheet. This specification applies to both Q0/nQ0 and Q1/nQ1 output pairs independently, making the 85222AM-01LF suitable for high-speed DDR2 memory clocking and FPGA reference clock distribution where timing margins are critical.

Does the 85222AM-01LF require external pull-up or pull-down resistors on its clock inputs?

No, the 85222AM-01LF includes internal 51 kΩ pull-up resistors on both CLK0 and CLK1 inputs, as specified in Table 2 of the datasheet. These integrated resistors eliminate the need for external biasing components, simplifying layout and reducing BOM cost. Unused clock inputs may be left floating, though a 1 kΩ resistor to ground is optionally recommended for ESD protection.

Can the 85222AM-01LF operate with both 2.5 V and 3.3 V supplies?

Yes, the 85222AM-01LF is fully specified to operate across two supply ranges: 2.375–2.625 V and 3.135–3.465 V. DC and AC parameters-including VIH/VIL thresholds, VOH/VOL levels, propagation delay, and part-to-part skew-are explicitly characterized for both voltages in Tables 3A–3C and 4A–4B. This dual-voltage capability enables seamless integration into mixed-supply systems without additional level-shifting circuitry.

What is the recommended termination for the HSTL outputs of the 85222AM-01LF?

The 85222AM-01LF HSTL outputs (Q0/nQ0 and Q1/nQ1) must be terminated with 50 Ω to ground, as stated in Note 1 of Table 3C and reinforced in the "Recommendations for Unused Input and Output Pins" section. This termination ensures proper voltage swing (0.45–1.4 V), meets JEDEC HSTL Class I specifications, and prevents signal reflections that would degrade timing margins in high-speed memory interfaces.

Is the 85222AM-01LF pin-compatible with other members of the 85222 family?

Yes, the 85222AM-01LF shares identical pinout, package dimensions, and electrical interface with all variants in the 85222-01 family-including 85222AM-01LFT and 85222AM-01-as confirmed by the shared PIN ASSIGNMENT diagram and Table 1 (Pin Descriptions) in the datasheet. All variants use the same 8-pin SOIC (M package) footprint and terminal functions, enabling drop-in replacement across RoHS/non-RoHS and tube/tape-and-reel configurations.