Infineon Technologies CY2308ZXI-1HT

Overview

CY2308ZXI-1HT from Cypress Semiconductor is a 3.3 V zero-delay clock buffer with on-chip PLL, designed for high-speed clock distribution in PC, telecom, and datacom systems. It delivers 10–133 MHz operation, <200 ps output-to-output skew, 75 ps typical cycle-to-cycle jitter at 66 MHz/15 pF, and supports two banks of four three-stateable outputs via S1/S2 control.

For engineers reviewing the CY2308ZXI-1HT datasheet, CY2308ZXI-1HT pinout, CY2308ZXI-1HT application, or CY2308ZXI-1HT equivalent, key selection criteria include industrial temperature range (–40°C to +85°C), TSSOP-16 package, zero-input-output propagation delay adjustability via FBK load, and dual-bank output enable/disable capability.

Technical Context

The CY2308ZXI-1HT implements a PLL-based zero-delay architecture where the REF input clock is locked to feedback from any selected output routed to the FBK pin. This enables precise phase alignment between input and outputs across varying capacitive loads.

It features two independent output banks (A and B), each with four CMOS-compatible clock outputs, controlled by S1/S2 select inputs. The device enters power-down mode (<25 µA IDD) when REF has no rising edges, and supports PLL bypass for system test via select input configuration.

Key Specifications

Pinout & Package

Package: 16-pin TSSOP (4.4 mm × 5.0 mm), lead pitch 0.65 mm, RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

CY2308ZXI-1HT is part of the CY2308 family; alternatives offer different frequency multiplication or drive strength.

Compared with CY2308SXI-1HT and CY2308ZXI-1H, the CY2308ZXI-1HT balances compact TSSOP packaging, industrial temperature rating, and moderate drive strength-making it optimal for space-constrained, thermally managed telecom and industrial control applications where strict jitter and skew control are required.

Availability

CY2308ZXI-1HT is available at Aetrix Electronics and suitable for PCI Express clock trees, telecom line card timing, and industrial PLC backplane synchronization requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY2308ZXI-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) designs high-performance timing, memory, and programmable logic solutions for computing, communications, and industrial markets.

The CY2308 product line delivers zero-delay, low-skew clock distribution ICs optimized for high-speed digital systems where phase alignment, jitter control, and flexible bank enablement are critical.

FAQ

What is the function of the FBK pin in CY2308ZXI-1HT?

The FBK pin receives external feedback from any CLKAx or CLKBx output to close the internal PLL loop. Its capacitive loading directly adjusts input-to-output propagation delay-equal loading across all outputs achieves true zero delay, while differential loading enables fine-grained delay tuning without external components.

How does the CY2308ZXI-1HT enter power-down mode?

The device automatically enters power-down mode when no rising edge is detected on the REF pin for >1 ms, tri-stating all outputs and reducing supply current to <25 µA. Power-down also activates when S2=0 and S1=0 per the Select Input Decoding table, providing both automatic and software-controllable low-power states.

Can CY2308ZXI-1HT generate frequencies other than the input reference?

No-the -1HT suffix denotes the base configuration where all outputs replicate the REF frequency (1×). Frequency multiplication (2×, 4×) requires CY2308-2, -3, or -4 variants; the -1HT lacks internal dividers/multipliers and relies solely on PLL phase alignment without frequency translation.

What is the maximum load capacitance supported at 133 MHz?

At 133 MHz, the CY2308ZXI-1HT supports up to 15 pF load capacitance per output, as specified in the Industrial Temperature Electrical Characteristics table. Exceeding this value degrades jitter performance (cycle-to-cycle jitter rises to ≤100 ps) and may cause duty cycle distortion beyond 40–60% limits.