Infineon Technologies CY22381SXC-212T

Overview

CY22381SXC-212T from Cypress Semiconductor is a three-PLL, flash-programmable clock generator in an 8-pin SOIC package operating at 3.3 V. It supports crystal inputs from 8–30 MHz or external clock inputs up to 166 MHz, delivers three independent programmable outputs (CLKA/CLKB/CLKC), and features ultra-wide dividers (11-bit P, 8-bit Q, 7-bit post-divide) for precise frequency synthesis in networking and datacom systems.

For engineers reviewing the CY22381SXC-212T datasheet, CY22381SXC-212T pinout, CY22381SXC-212T application, or CY22381SXC-212T equivalent, key selection criteria include its field-programmable PLL architecture, glitch-free frequency select via FS pin, on-die linear crystal load capacitors (6–30 pF), low-jitter performance (200 ps peak-to-peak), and configurable power-saving modes (Shutdown/OE/Suspend).

Technical Context

The CY22381SXC-212T integrates three fully independent PLLs, each with an 11-bit feedback divider (P) and 8-bit reference divider (Q), enabling simultaneous generation of three unrelated output frequencies from a single reference source. Output routing is managed by a 4×3 crosspoint switch selecting among REF, PLL1, PLL2, or PLL3, followed by individual 7-bit post-dividers per output.

Its programmable crystal drive strength and on-die linear 6–30 pF load capacitors eliminate external tuning components and reduce frequency drift across temperature and supply variations. The FS/SUSPEND/OE/SHUTDOWN pin (Pin 8) supports four configurable functions-frequency select, suspend, output enable, or full shutdown-with guaranteed glitch-free transitions during frequency switching.

Key Specifications

Pinout & Package

Package: 8-pin Small Outline Integrated Circuit (SOIC), NiPdAu lead finish, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT5V41001PGG and Si5338A-D-GM, the CY22381SXC-212T uniquely balances field programmability, low pin count (8-pin SOIC), and deterministic jitter (<200 ps) for cost-sensitive, space-constrained telecom and networking boards where configuration may evolve post-deployment.

Availability

CY22381SXC-212T is available at Aetrix Electronics and suitable for network switch timing, telecom line card synchronization, and industrial Ethernet controller applications requiring stable component supply and long-term lifecycle support.

Supply support for CY22381SXC-212T 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

Cypress Semiconductor (now part of Infineon Technologies) designs high-performance mixed-signal ICs for embedded systems, with expertise in programmable logic, memory, and timing solutions.

The CY22381 product line targets general-purpose programmable clock generation in space-constrained networking, datacom, and telecom equipment where field configurability and jitter performance are critical.

FAQ

What is the maximum external reference clock frequency supported by CY22381SXC-212T?

The device accepts external reference clock inputs up to 166 MHz in industrial temperature range (–40°C to +85°C) and up to 166 MHz in commercial range (0°C to +70°C), provided the duty cycle remains between 40% and 60% measured at VDD/2. This enables direct use of recovered clocks from high-speed serial links without additional conditioning.

Can CY22381SXC-212T operate without a crystal?

Yes. When XTALIN is driven by an external CMOS clock signal (1–166 MHz), XTALOUT must be left floating and the internal crystal oscillator is bypassed. The device then uses the external signal as its reference source, supporting applications where a precision oscillator is already present elsewhere on the board.

How does the FS pin enable glitch-free frequency switching?

The FS pin selects between two pre-programmed sets of PLL and output divider values stored in flash. Transitions occur synchronously with internal clock edges, ensuring phase continuity and eliminating runt pulses or metastability. This is verified in the datasheet's switching waveforms and used in dynamic bandwidth allocation systems.

What is the significance of on-die linear crystal load capacitors?

Unlike FET-based capacitors, the CY22381SXC-212T uses true parallel-plate on-die capacitors with 0.375 pF resolution across 6–30 pF. This linearity prevents frequency shift caused by supply, temperature, or bias variation-critical for MPEG transport stream timing and telecom synchronization where absolute accuracy matters.