Renesas 85222AM-01LFT

Overview

85222AM-01LFT from Renesas Electronics (formerly IDT) is a dual LVCMOS/LVTTL-to-differential HSTL clock translator IC. It accepts two single-ended LVCMOS or LVTTL clock inputs (CLK0, CLK1) and generates two matched differential HSTL output pairs (Q0/nQ0, Q1/nQ1), supporting up to 350 MHz operation with ≤1075 ps propagation delay and ≤375 ps part-to-part skew. It operates from 2.5 V or 3.3 V supply and targets high-speed memory interface timing in DDR systems.

For engineers reviewing the 85222AM-01LFT datasheet, 85222AM-01LFT pinout, 85222AM-01LFT application, or 85222AM-01LFT equivalent, key selection criteria include HSTL output compliance, dual-channel skew matching, supply voltage flexibility (2.5 V/3.3 V), input level compatibility (LVCMOS/LVTTL), and SOIC-8 thermal performance under industrial ambient conditions.

Technical Context

The 85222AM-01LFT implements a fully static, non-latching translation architecture with internal pull-up resistors (51 kΩ) on CLK0 and CLK1 inputs. Each channel independently converts single-ended logic transitions into complementary HSTL outputs terminated to GND via 50 Ω, delivering controlled 0.45–1.4 V peak-to-peak swing depending on VDD.

Its AC performance is characterized across both 2.5 V and 3.3 V supply rails, with propagation delay varying from 700–1075 ps (3.3 V) or 700–1200 ps (2.5 V), and part-to-part skew tight at 375 ps (3.3 V) or 475 ps (2.5 V), per JEDEC Standard 65.

Key Specifications

Pinout & Package

85222AM-01LFT is housed in an 8-pin lead-free SOIC package (M suffix), measuring 3.90 mm × 4.92 mm × 1.37 mm, with JEDEC MS-012 outline and θJA = 112.7°C/W (0 lfpm, multi-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 85222AM-01LF and 85222AM-01G, the 85222AM-01LFT offers identical timing and electrical performance while providing RoHS-compliant lead-free packaging and tape-and-reel logistics optimized for SMT production lines.

Availability

85222AM-01LFT is available at Aetrix Electronics and suitable for DDR2 memory interfaces, FPGA-to-ASIC clock distribution, and industrial backplane timing requiring stable component supply, full RoHS compliance, and guaranteed long-term availability.

Supply support for 85222AM-01LFT 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 delivering microcontrollers, analog, power, and timing solutions for automotive, industrial, infrastructure, and IoT applications.

The 85222AM-01LFT belongs to Renesas' high-speed clock translation product line, designed specifically for bridging single-ended logic domains to JEDEC-compliant HSTL interfaces in memory and data-path subsystems.

FAQ

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

The 85222AM-01LFT supports a maximum output frequency of 350 MHz under both 2.5 V and 3.3 V supply conditions, as verified in AC characterization tables across temperature and voltage corners. This makes the 85222AM-01LFT suitable for DDR2 memory clocking and other high-speed digital interfaces requiring precise edge alignment at sub-nanosecond timing resolution.

Does the 85222AM-01LFT require external termination resistors on its HSTL outputs?

Yes - the 85222AM-01LFT HSTL outputs (Q0/nQ0 and Q1/nQ1) must be terminated with 50 Ω to GND to meet specified VOH, VOL, and VSWING values. The datasheet explicitly states that output parameters are measured under this condition, and unused differential pairs should either be fully terminated or left floating with no attached traces to avoid signal integrity degradation.

Can the 85222AM-01LFT operate from both 2.5 V and 3.3 V supplies simultaneously?

No - the 85222AM-01LFT uses a single VDD pin and must be powered from either 2.5 V ±5% or 3.3 V ±5%, not both. It is not a dual-supply device; however, it maintains full functionality and specified AC/DC performance across either rail, enabling flexible integration into mixed-voltage systems without additional level-shifting circuitry.

What is the purpose of the internal 51 kΩ pull-up resistors on CLK0 and CLK1 of the 85222AM-01LFT?

The internal 51 kΩ pull-up resistors on CLK0 and CLK1 ensure defined logic-high states when inputs are unconnected or driven by open-drain sources. They eliminate the need for external biasing components, simplify schematic design, and reduce PCB footprint - a key advantage confirmed in Table 2 of the 85222AM-01LFT datasheet and validated in application schematics showing direct connection to LVCMOS drivers.

Is the 85222AM-01LFT pin-compatible with earlier IDT-marked versions like ICS85222AM-01LFT?

Yes - the 85222AM-01LFT is a direct replacement for IDT-branded ICS85222AM-01LFT devices, retaining identical pinout, electrical specifications, package dimensions, and thermal characteristics. Renesas acquired IDT's timing business and continued the 85222 product family without changes to the 85222AM-01LFT's form, fit, or function.