Infineon Technologies CY7B992-7JI

Overview

CY7B992-7JI from Cypress Semiconductor is a programmable skew clock buffer IC 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 jitter <25 ps RMS. It serves as a timing optimization engine in high-speed computer backplanes and memory subsystems requiring precise inter-clock alignment.

For engineers reviewing the CY7B992-7JI datasheet, CY7B992-7JI pinout, CY7B992-7JI application, or CY7B992-7JI equivalent, key selection criteria include output skew resolution (±0.7–1.5 ns/time unit), frequency multiplication capability (2×/4×), 50Ω transmission line drive, and industrial temperature support (–40°C to +85°C).

Technical Context

The CY7B992-7JI integrates a fully self-contained PLL with VCO and time-unit generator, enabling cancellation of external trace delay and achieving true zero input-to-output delay when FB is connected to a zero-skew output. Its skew select matrix implements nine discrete delay/function states per output pair using three-level FS, xF0, and xF1 controls.

Each output pair supports independent configuration for inverted/non-inverted polarity, divide-by-2/divide-by-4, or multiply-by-2/multiply-by-4 (via feedback reconfiguration), with all outputs maintaining 50% duty cycle and driving 50Ω terminated lines. The device uses dual power domains: VCCQ (5V ±10%) for logic and VCCN (5V ±10%) for output drivers.

Key Specifications

Pinout & Package

32-pin PLCC/LCC package (13.97 mm × 13.97 mm, 1.27 mm pitch) with gull-wing leads, lead-free and RoHS-compliant per ordering suffix "-7JI".

Key Features

Applications

Equivalent & Alternatives

CY7B992-7JI alternatives are limited due to its unique combination of programmable skew, integrated PLL, and CMOS output architecture.

Compared with IDT5V9885BGI and ICS853S01I, CY7B992-7JI uniquely delivers per-pair programmable skew within a zero-delay PLL architecture-enabling real-time trace delay compensation and flexible clock domain synthesis not achievable with fixed-skew or non-PLL alternatives.

Availability

CY7B992-7JI is available at Aetrix Electronics and suitable for high-speed memory subsystems, multi-processor backplanes, and network packet processors requiring stable component supply, long-term lifecycle assurance, and industrial temperature operation.

Supply support for CY7B992-7JI 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, networking, and industrial applications.

CY7B992 belongs to Cypress's Programmable Skew Clock Buffer (PSCB) product line, engineered specifically to resolve timing closure challenges in high-speed digital systems where interconnect delay dominates clock skew budgets.

FAQ

What is the maximum supported output load impedance for CY7B992-7JI?

The device is specified to drive 50Ω terminated transmission lines, with full-swing CMOS output levels maintained under 46 mA sink current. Driving higher impedances (e.g., 75Ω or open-circuit) increases rise/fall times and may degrade jitter performance beyond datasheet limits; proper termination is mandatory for guaranteed AC timing compliance.

Can CY7B992-7JI generate a 160 MHz output from a 40 MHz REF input?

No. While the device supports 2× and 4× multiplication, its maximum output frequency is 80 MHz. Multiplying a 40 MHz REF yields 80 MHz (2×) or 160 MHz (4×), but the latter exceeds the 80 MHz upper limit and violates AC timing specifications; 4× mode is only valid when REF ≤ 20 MHz.

How does the TEST pin affect PLL lock behavior?

When TEST is driven HIGH or MID, the internal PLL is disabled and outputs track REF directly with fixed skew relationships. No lock time (tLOCK) applies in this mode. When TEST = LOW (normal operation), the PLL acquires lock within 10 ms typical after power-up or REF stabilization, and all skew values are referenced to the locked FB output.

Is CY7B992-7JI pin-compatible with CY7B991-7JI?

Yes-both share identical 32-pin PLCC/LCC pinouts, power requirements, and functional pin definitions. The sole difference is output logic family: CY7B992 drives CMOS loads (VCC–0.75 V VOH), while CY7B991 drives TTL (2.4 V VOH). Swapping requires verifying load interface voltage thresholds and adjusting termination accordingly.