Infineon Technologies CY7B993V-5AXIT

Overview

CY7B993V-5AXIT from Infineon Technologies (formerly Cypress) is a high-speed multi-phase PLL clock buffer with 18 LVTTL outputs, integrated PLL, and user-configurable phase/divide functions. It operates from 12 MHz to 100 MHz input/output, delivers <50 ps typical cycle-to-cycle jitter, supports zero input-to-output delay, and targets timing-critical computer and communication systems requiring precise multi-bank clock distribution.

For engineers reviewing the CY7B993V-5AXIT datasheet, CY7B993V-5AXIT pinout, CY7B993V-5AXIT application, or CY7B993V-5AXIT equivalent, this page provides verified technical context, bank-level phase/divide control logic, TTB™-guaranteed skew performance, fault-tolerant dual-reference switching, and hot-insertable LVTTL/LVPECL input compatibility.

Technical Context

The CY7B993V-5AXIT implements a fully integrated PLL with phase-frequency detector, charge-pump filter, VCO, and programmable divider/phase generator. Its FS pin selects one of three nominal frequency ranges (12–26 MHz, 24–52 MHz, or 48–100 MHz), directly setting the VCO operating point and time-unit resolution (625 ps or 1300 ps steps).

Five output banks-four configurable 4-output banks plus a dedicated 2-output feedback bank-support independent divide ratios (1–6, 8, 10, 12) and ±10.4 ns phase adjustment. Reference and feedback inputs accept both LVTTL and LVPECL signals, with automatic failover via REFSEL/FBSEL control and internal pull-downs on select control pins.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flat Package (TQFP), thermally enhanced, RoHS-compliant, with exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed multi-phase PLL clock buffer applications.

Compared with IDT8T49N242A and Si5332A-D-GM, the CY7B993V-5AXIT uniquely balances hardware-configurable multi-bank phase/divide control, guaranteed TTB™, and zero-latency distribution-making it optimal for deterministic, high-channel-count clock trees where firmware intervention is prohibited.

Availability

CY7B993V-5AXIT is available at Aetrix Electronics and suitable for high-speed server memory interfaces, multi-core processor clock trees, industrial Ethernet switch fabrics, and PCIe Gen3/Gen4 root complex timing requiring stable component supply and long-term industrial temperature support.

Supply support for CY7B993V-5AXIT 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

Infineon Technologies is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, sensing, connectivity, and security solutions for automotive, industrial, and communications markets.

The RoboClock® product line was originally developed by Cypress Semiconductor and continues under Infineon to deliver deterministic, multi-phase PLL clock buffers for high-performance computing and wired infrastructure applications demanding guaranteed timing budgets and hardware configurability.

FAQ

What is the maximum number of outputs that can operate simultaneously at 100 MHz?

The CY7B993V-5AXIT supports all 18 LVTTL outputs simultaneously at up to 100 MHz under commercial temperature conditions. At industrial temperature (–40°C to +85°C), up to six outputs are rated for full 100 MHz operation per device specification; bank-level disable controls allow selective activation to meet thermal limits.

How does the FS pin affect phase adjustment resolution?

The FS pin selects the VCO's nominal frequency range and determines the time unit (tU) used for phase shifts. At LOW FS setting, tU = 625 ps; at MID, tU = 1300 ps; at HIGH, tU = 1300 ps. This mapping is fixed per datasheet Table 2 and directly governs the smallest phase step achievable on any output bank.

Can REFA+ and REFB+ be driven from the same clock source?

No-REFA+ and REFB+ are separate differential input pairs intended for independent clock sources. Driving both from the same source violates the fault-tolerant reference architecture and may cause undefined PLL behavior due to conflicting feedback paths and improper REFSEL logic interpretation.

Is the LOCK signal asserted before or after output clocks stabilize?

The LOCK signal asserts only after the PLL achieves stable phase and frequency lock, and all output clocks have settled to their final frequency and phase relationship with the reference input. It does not indicate initial power-on stabilization but confirmed closed-loop convergence per internal phase detector thresholds.