Infineon Technologies CY2077FSXCT

Overview

CY2077FSXCT from Cypress Semiconductor is a high-accuracy, EPROM-programmable single-PLL clock generator with 12-bit feedback and 10-bit reference dividers, supporting 390 kHz–133 MHz output (5V) or 390 kHz–100 MHz (3.3V), TTL/CMOS duty cycle selection, and programmable PWR_DWN/OE control. It serves as a system clock synthesizer in DVD players, set-top boxes, and networking equipment using low-cost crystals or external clocks.

For engineers reviewing the CY2077FSXCT datasheet, CY2077FSXCT pinout, CY2077FSXCT application, or CY2077FSXCT equivalent, key selection criteria include PLL resolution (12-bit P / 10-bit Q), dual-voltage operation (3.3V/5V), synchronous/asynchronous power management, jitter performance (80 ps typ.), and 16 post-divide options across PLL or reference paths.

Technical Context

The CY2077FSXCT implements a single-loop PLL architecture with a phase detector, charge pump, and VCO, where output frequency is calculated as F_OUT = F_REF × (P + 5) / (Q + 2), with EPROM-programmable P (12-bit) and Q (10-bit) values. Reference input accepts 10–30 MHz fundamental-mode crystals or 1–75 MHz external clocks.

It supports two configurable control functions on Pin 4: either active-low PWR_DWN (full circuit power-down with relock delay) or active-high OE (three-state output with weak pull-down), each selectable for asynchronous or synchronous assertion relative to CLKOUT edges - enabling glitch-free transitions and fast wake-up in OE mode.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (Small Outline Integrated Circuit), surface-mount, 150 mil width, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

Two verified alternatives provide comparable PLL-based clock generation with trade-offs in programmability, voltage range, and feature set.

Compared with IDT5V49EE1 and ICS552GI-01LFT, CY2077FSXCT uniquely supports field-programmable frequencies via EPROM, dual-voltage operation, and dual-mode (PWR_DWN/OE) power control - making it optimal for design flexibility, low-NRE prototyping, and mixed-logic environments.

Availability

CY2077FSXCT is available at Aetrix Electronics and suitable for DVD players, set-top boxes, and network interface cards requiring stable component supply, long-lifecycle availability, and consistent parametric performance across commercial and industrial temperature grades.

Supply support for CY2077FSXCT 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) is a U.S.-based semiconductor company specializing in programmable system-on-chip solutions, memory, and timing devices for consumer, industrial, and communications markets.

CY2077 belongs to Cypress's CyberClocks™ family of programmable clock generators, designed specifically for cost-sensitive, high-accuracy timing applications where crystal-based PLL synthesis replaces multiple fixed-frequency oscillators.

FAQ

What is the maximum output frequency supported by CY2077FSXCT at 3.3V?

The CY2077FSXCT supports up to 100 MHz output frequency when operated at 3.0–3.6 V supply voltage. This limit is specified under loaded conditions with appropriate capacitive load (≤15 pF for >40 MHz), and assumes stable VCO operation above 100 MHz per datasheet Note 2.

Can CY2077FSXCT use an external clock instead of a crystal?

Yes - Pin 3 (XTALIN) accepts 1–75 MHz external clock signals. When doing so, Pin 2 (XTALOUT) must be left unconnected (floating), and the internal crystal oscillator circuit is disabled. The PLL locks directly to the external reference, preserving full divider and output configuration flexibility.

How does the PWR_DWN mode differ from OE mode in terms of system behavior?

In PWR_DWN mode, the entire PLL and oscillator are powered down; CLKOUT stops and requires full relock (1–2 ms startup) upon wake-up. In OE mode, only the output buffer is disabled (high-Z with weak pull-down); the PLL remains locked, enabling immediate CLKOUT restoration on enable - critical for low-latency wake-up in power-aware systems.

Is CY2077FSXCT compatible with both TTL and CMOS logic families?

Yes - EPROM programming allows selection of either TTL-level (centered at 1.4 V) or CMOS-level (centered at VDD/2) duty cycle. Combined with 3.3V/5V supply support and output drive strength (16 mA at 5V, 8 mA at 3.3V), it interfaces directly with both TTL and CMOS loads without external level shifters.