Infineon Technologies CY23S09ZXC-1HT

Overview

CY23S09ZXC-1HT from Cypress Semiconductor is a 3.3 V spread-aware zero-delay clock buffer IC with nine low-skew outputs (4+4+1 banked configuration), PLL-based jitter control, and 10–133 MHz operating range. It delivers <250 ps output-to-output skew, <200 ps cycle-to-cycle jitter, and supports system-level clock distribution in PCI, CPU, and industrial timing applications.

For engineers reviewing the CY23S09ZXC-1HT datasheet, CY23S09ZXC-1HT pinout, CY23S09ZXC-1HT application, or CY23S09ZXC-1HT equivalent, key selection criteria include spread-spectrum pass-through capability, device-to-device skew <700 ps, high-drive (-1H) output slew rate of 1 V/ns, and TSSOP-16 package compatibility with space-constrained PCB layouts.

Technical Context

The CY23S09ZXC-1HT integrates an on-chip PLL with internal feedback via CLKOUT to achieve zero input-output propagation delay (<±350 ps). Its dual-bank output architecture (Bank A: CLKA1–CLKA4; Bank B: CLKB1–CLKB4; CLKOUT) enables selective three-state control via S1/S2 inputs, including PLL shutdown and direct reference passthrough for test mode.

Designed for spread-spectrum timing systems, it preserves input frequency modulation without filtering-critical for EMI reduction in synchronized digital systems. The -1H variant provides faster rise/fall times (1.5 ns) and higher drive strength versus standard -1 versions, verified under 30 pF/10 pF load conditions up to 133 MHz.

Key Specifications

Pinout & Package

Package: 16-pin, 4.4 mm wide TSSOP (Pb-free, ZZ16 footprint), optimized for thermal performance (θ_JA = 108 °C/W) and high-density routing.

Key Features

Applications

Equivalent & Alternatives

CY23S09ZXC-1HT has two functionally compatible alternatives with documented differences in drive strength, package, and temperature grade.

Compared with CY23S09SXC-1HT and ICS8309AM-01LFT, CY23S09ZXC-1HT uniquely combines TSSOP space savings, 133 MHz capability, and guaranteed spread-spectrum transparency-making it optimal for next-generation compact, EMI-sensitive timing designs.

Availability

CY23S09ZXC-1HT is available at Aetrix Electronics and suitable for PCI Express clock distribution, CPU core clock fanout, and industrial PLC backplane timing requiring stable component supply across commercial temperature ranges.

Supply support for CY23S09ZXC-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

Cypress Semiconductor (now part of Infineon Technologies) is a fabless semiconductor company specializing in programmable system-on-chip (PSoC), memory, and timing solutions for industrial, automotive, and consumer electronics.

The CY23S09 product line delivers cost-optimized, spread-aware zero-delay buffers targeting high-reliability clock distribution in compute, communications, and automation systems where deterministic skew and EMI control are critical.

FAQ

What is the purpose of the CLKOUT pin on CY23S09ZXC-1HT?

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

How does the CY23S09ZXC-1HT handle spread-spectrum clock inputs?

It preserves the input spread-spectrum modulation without filtering or distortion, enabling EMI reduction in downstream circuits. Unlike non-spread-aware buffers, it avoids introducing tracking skew between reference and output edges-verified in Cypress Application Note AN1234 and Whitepaper EMI and Spread Spectrum Technology.

Can Bank B outputs be disabled independently of Bank A?

Yes. When S2=0 and S1=0, both Bank A and Bank B are three-stated. When S2=0 and S1=1, only Bank A is active; Bank B remains three-stated. This allows dynamic power reduction and noise isolation in multi-domain clock trees without external logic.

What is the difference between -1 and -1H speed grades?

The -1H grade provides faster rise/fall times (1.5 ns vs. 2.5 ns), higher output drive strength (12 mA sink/source vs. 8 mA), and improved slew rate (1 V/ns vs. unspecified). These enhancements reduce signal degradation on long traces or high-capacitance loads, making -1H preferred for >100 MHz operation and dense PCB layouts.