Infineon Technologies CY7B992-7JXCT

Overview

CY7B992-7JXCT from Cypress Semiconductor is a programmable skew clock buffer with eight CMOS outputs arranged in four independently configurable pairs, supporting 3.75–80 MHz operation, ±18 ns user-selectable skew per pair, zero input-to-output delay via integrated PLL, and 50% duty cycle outputs driving 50Ω terminated lines - deployed in high-speed computer timing systems requiring precise inter-output skew control.

For engineers reviewing the CY7B992-7JXCT datasheet, CY7B992-7JXCT pinout, CY7B992-7JXCT application, or CY7B992-7JXCT equivalent, key selection criteria include output skew resolution (±1.0 ns increments), frequency multiplication capability (2×/4×), three-level function select interface, PLL-based zero-delay architecture, and PLCC-32 package compatibility with legacy board layouts.

Technical Context

The CY7B992-7JXCT integrates a fully self-contained PLL with phase-frequency detector, charge-pump filter, and voltage-controlled oscillator to achieve zero input-to-output delay while compensating for external transmission line and load delays. Its time-unit generator produces discrete delay steps (t_U) ranging from 1.0 ns to 62.5 ps depending on FS pin setting and operating frequency.

Each of the four output pairs (1Q0/1Q1 through 4Q0/4Q1) is driven by low-skew, high-fanout CMOS buffers and controlled by dedicated three-level function select inputs (xF0/xF1), enabling nine distinct configurations per pair - including invert/non-invert, divide-by-2/divide-by-4, and skew offsets from –4t_U to +4t_U - all referenced to the REF input.

Key Specifications

Pinout & Package

Package: 32-pin Plastic Leaded Chip Carrier (PLCC), 11.43 mm × 13.97 mm body, J-lead, RoHS-compliant (per datasheet Rev. *E).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT5V9885BGI and ICS853S01I, the CY7B992-7JXCT uniquely combines integrated PLL-based zero-delay operation, continuous ±1 ns skew programming, and 5 V CMOS drive strength - making it optimal for legacy 5 V systems requiring field-adjustable timing without redesigning clock tree topology.

Availability

CY7B992-7JXCT is available at Aetrix Electronics and suitable for high-speed memory interface timing, multi-processor synchronization, and ASIC/FPGA clock distribution requiring stable component supply and long-term obsolescence management.

Supply support for CY7B992-7JXCT 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 industrial, automotive, and computing applications.

The CY7B99x series was developed specifically for programmable clock distribution in high-end computing systems - emphasizing sub-nanosecond skew control, PLL-based delay cancellation, and robust 5 V CMOS drive for legacy and mixed-voltage backplanes.

FAQ

What is the difference between CY7B991 and CY7B992?

The CY7B991 provides TTL-compatible outputs (VOH ≥ 2.4 V, VOL ≤ 0.45 V), while the CY7B992 delivers full-swing CMOS outputs (VOH ≈ VCC, VOL ≈ 0 V) with higher drive strength and lower power consumption. Both share identical pinout, skew programming, PLL architecture, and functional capabilities - only output electrical characteristics differ.

Can CY7B992-7JXCT operate without connecting the FB pin?

No - the FB pin must be connected to one of the eight outputs (typically a zero-skew output like 1Q0 with xF0=xF1=MID) to close the PLL loop. Without FB connection, the PLL remains unlocked, resulting in undefined output timing, excessive jitter, and failure to achieve zero input-to-output delay or specified skew accuracy.

How is skew calibrated across temperature and voltage?

Skew is maintained via the integrated PLL and time-unit generator, which track VCO frequency changes with temperature and supply voltage. The t_U step size scales inversely with operating frequency (e.g., 1.0 ns at 44 MHz, 62.5 ps at 80 MHz), ensuring consistent skew resolution across the 3.75–80 MHz range and –40°C to +85°C industrial temperature range.

Is the TEST pin required for normal operation?

No - the TEST pin must be tied LOW (GND) for normal PLL-based operation. Leaving it unconnected or floating risks unintended MID/HIGH states that disconnect the PLL and force direct REF-to-output pass-through, causing loss of zero-delay functionality and unpredictable output skew behavior.