Infineon Technologies CY2309SXC-1HT

Overview

CY2309SXC-1HT from Infineon Technologies (formerly Cypress) is a 3.3 V zero-delay clock buffer IC with integrated PLL, designed to distribute high-speed reference clocks in CPU and PCI bus systems. It delivers nine low-skew outputs (4+4+1 banked configuration), supports 10–133 MHz input frequencies, achieves ≤85 ps typical output-to-output skew, and features test-mode bypass of the PLL for system validation.

For engineers reviewing the CY2309SXC-1HT datasheet, CY2309SXC-1HT pinout, CY2309SXC-1HT application, or CY2309SXC-1HT equivalent, key selection criteria include its 16-pin SOIC/TSSOP package, high-drive (-1H) output capability (12 mA sink/source), industrial temperature range (–40°C to +85°C), and bank-selectable output control via S1/S2 pins.

Technical Context

The CY2309SXC-1HT implements an on-chip PLL with internal feedback from the CLKOUT pin to achieve zero input-to-output propagation delay when all outputs-including CLKOUT-are uniformly loaded. Its dual-bank architecture (Bank A: CLKA1–CLKA4; Bank B: CLKB1–CLKB4) enables selective three-state control per bank using S1/S2 inputs.

It operates at 3.3 V with 5-V-tolerant REF input, enters power-down mode (<25 μA IDD) when REF has no rising edges, and supports test-mode direct clock pass-through by asserting S1=1/S2=0-bypassing the PLL while driving all outputs from REF.

Key Specifications

Pinout & Package

Package: 16-pin 150-mil SOIC (SO-16) or 4.4-mm TSSOP - both RoHS-compliant, surface-mount, and compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

Two verified alternatives exist for CY2309SXC-1HT with documented functional and parametric differences:

Compared with IDT74FCT807CTPYG and NB3N502MNR2G, the CY2309SXC-1HT uniquely combines zero-delay PLL operation, 5-V-tolerant input, bank-selectable outputs, and industrial temperature support-making it irreplaceable for legacy-compatible, low-jitter CPU clock distribution.

Availability

CY2309SXC-1HT is available at Aetrix Electronics and suitable for PCI bus clock distribution, Pentium-based industrial controllers, and multi-core processor reference clock generation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY2309SXC-1HT 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, automotive MCUs, and timing solutions-with broad industrial and automotive qualification expertise.

The CY2309 product line was originally developed by Cypress Semiconductor and continues under Infineon's timing portfolio to serve legacy and new designs requiring cost-effective, zero-delay clock fanout in industrial and computing applications.

FAQ

What is the function of the CLKOUT pin beyond feedback?

The CLKOUT pin serves as the internal PLL feedback node and must be loaded identically to other outputs to achieve zero input-output delay. Even when unused, it requires a capacitive load matching the other outputs (e.g., 30 pF below 100 MHz). Its voltage swing and edge rate are identical to CLKA/CLKB outputs, making it usable as a tenth clock output if needed.

How does the S1/S2 select logic affect power consumption?

When S1=0/S2=0, both banks are three-stated and the PLL remains active-drawing ~35 mA. When S1=1/S2=1, all outputs drive and PLL stays on. Only S1=1/S2=0 triggers PLL bypass (no lock required) but still drives all outputs. True low-power mode occurs only when REF stops toggling-reducing IDD to <25 μA regardless of S1/S2 state.

Can CY2309SXC-1HT drive 50 Ω transmission lines directly?

No. The CY2309SXC-1HT is designed for CMOS fanout into capacitive loads (≤30 pF below 100 MHz). Driving 50 Ω lines requires series termination and proper impedance matching; direct connection causes overshoot, ringing, and violates VOL/VOH specs. Use dedicated clock drivers (e.g., SY100EL11) for 50 Ω transmission line interfaces.

Is the –1H suffix solely about drive strength, or does it impact jitter?

The –1H suffix specifies higher drive strength (±12 mA vs. ±8 mA for –1), resulting in faster edge rates and reduced sensitivity to capacitive loading variations. This improves cycle-to-cycle jitter margin-60 ps typical for –1H versus 75 ps for –1 under identical conditions-but does not alter PLL architecture or inherent random jitter performance.