Renesas ICS853P022AGLFT

Overview

ICS853P022AG from Integrated Circuit Systems is a dual-channel LVCMOS/LVTTL-to-differential 3.3V LVPECL clock translator with 1.1GHz maximum output frequency, 320ps typical propagation delay, and 0.03ps RMS additive phase jitter. It operates from 3.0V–3.8V VCC (VEE = 0V) and supports industrial temperature range (−40°C to +85°C), serving as a timing interface in high-speed serial link receivers and FPGA clock distribution networks.

For engineers reviewing the ICS853P022AG datasheet, ICS853P022AG pinout, ICS853P022AG application, or ICS853P022AG equivalent, key selection criteria include differential LVPECL output drive capability, single-ended input compatibility with legacy logic families, part-to-part skew ≤650ps, and RoHS-compliant TSSOP-8 packaging for space-constrained PCB layouts.

Technical Context

The ICS853P022AG integrates two independent LVCMOS/LVTTL input buffers feeding dedicated LVPECL output drivers, each delivering complementary Q/nQ differential pairs. Its architecture supports both LVPECL mode (VCC = 3.0–3.8V, VEE = 0V) and ECL mode (VCC = 0V, VEE = −3.8 to −3.0V), with DC-coupled outputs requiring external 50Ω termination to VCC − 2V.

Input thresholds are defined per LVCMOS/LVTTL standards: VIH ≥ 2.0V (min at VCC = 3.3V), VIL ≤ 0.8V (max), ensuring robust noise margin. Output voltage swing is specified as VOH ≈ 2.25V and VOL ≈ 1.45V (LVPECL mode, VCC = 3.3V), with rise/fall times ≤130ps under 20%–80% conditions into 50Ω loads.

Key Specifications

Pinout & Package

ICS853P022AG is housed in an 8-pin TSSOP (G package) with 0.65mm pitch, JEDEC MO-187 compliant, measuring 3.0mm × 3.0mm × 0.95mm. Thermal resistance θJA = 101.7°C/W (still air, multilayer PCB).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LVCMOS/LVTTL-to-LVPECL translation applications.

Compared with MC100EPT22DG and NB7L573MNG, the ICS853P022AG uniquely balances 3.3V LVPECL compatibility, industrial temperature support, and TSSOP-8 RoHS packaging-making it optimal for cost-sensitive, space-constrained upgrades of existing 1–3GHz timing interfaces without supply or layout overhaul.

Availability

ICS853P022AG is available at Aetrix Electronics and suitable for high-speed serial link receivers, FPGA clock distribution networks, optical transport equipment, and test instrumentation requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for ICS853P022AG 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), now part of IDT (Renesas), specialized in high-performance clock generation, distribution, and translation ICs before its acquisition in 2019.

The ICS853P022AG belongs to the HiPerClockS™ family, engineered specifically for low-jitter, high-frequency clock translation in telecom infrastructure, datacom, and computing applications where deterministic timing and signal integrity are critical.

FAQ

What is the recommended termination for ICS853P022AG LVPECL outputs?

ICS853P022AG LVPECL outputs require DC-coupled 50Ω termination to VCC − 2V. For VCC = 3.3V, this means terminating each differential pair (Qx/nQx) to 1.3V using two 125Ω resistors-one from Qx to 1.3V and one from nQx to 1.3V-or a Thevenin equivalent. This ensures proper common-mode voltage (≈1.3V) and differential swing (≈800mV), meeting LVPECL specifications and minimizing reflections.

Does ICS853P022AG support ECL mode, and how does it differ from LVPECL mode?

Yes, ICS853P022AG supports ECL mode with VCC = 0V and VEE = −3.0V to −3.8V. In ECL mode, output voltage levels shift to VOH ≈ −1.12V and VOL ≈ −1.79V (typical), requiring termination to VEE + 2V (≈−1.8V). Unlike LVPECL mode-which uses positive supply and ground-referenced logic-ECL mode relies on negative supply and delivers inverted logic polarity relative to LVPECL, necessitating careful system-level signal interpretation.

What is the maximum allowable load capacitance on ICS853P022AG outputs?

The ICS853P022AG datasheet does not specify a maximum load capacitance limit; instead, it defines AC performance under 50Ω matched termination. Exceeding 50Ω load impedance or adding significant capacitive loading (>2pF) degrades rise/fall times, increases jitter, and may violate the 1.1GHz bandwidth specification. For reliable operation, maintain controlled-impedance 50Ω transmission lines and minimize stub lengths and via capacitance in PCB layout.

Is ICS853P022AG pin-compatible with MC100EPT22, and what design changes are needed?

Yes, ICS853P022AG is pin-compatible with MC100EPT22 per datasheet note. However, MC100EPT22 operates only in ECL mode (−4.5V VEE), while ICS853P022AG supports both ECL and LVPECL modes. To migrate, replace the −4.5V supply with 0V at VEE and apply 3.3V to VCC; retain identical PCB footprint and termination network. No layout changes are required, but verify that downstream receivers accept LVPECL common-mode voltage (≈1.3V).

How does the 0.03ps RMS additive phase jitter of ICS853P022AG impact system-level timing budgets?

The 0.03ps RMS additive phase jitter of ICS853P022AG contributes minimally to total jitter in cascaded clock trees. For example, in a 10GbE system with 1ps total jitter budget, this device adds just 0.9% of the allocation-leaving >99% headroom for PLLs, interconnects, and other components. This enables robust margin for jitter accumulation across multi-stage timing paths while meeting IEEE 802.3ap and Fibre Channel FC-PI-4 specifications.