Cypress Semiconductor Corp CY7C25422KV18-333BZXI

Overview

CY7C25422KV18-333BZXI from Cypress Semiconductor is a 72-Mbit QDR® II+ SRAM with two-word burst architecture, 2.0-cycle read latency, and on-die termination (ODT). It features separate read/write ports, DDR interfaces operating at 666 MHz data rate on a 333 MHz clock, 1.8 V core supply, and 165-ball FBGA (13 × 15 × 1.4 mm) packaging. Used in high-bandwidth networking line cards for packet buffering.

For engineers reviewing the CY7C25422KV18-333BZXI datasheet, CY7C25422KV18-333BZXI pinout, CY7C25422KV18-333BZXI application, or CY7C25422KV18-333BZXI equivalent, key selection criteria include 333 MHz maximum clock frequency, HSTL I/O compatibility, ODT support on D[17:0]/BWS[1:0]/K/K inputs, echo clock (CQ/CQ) timing alignment, and DOFF-controlled latency mode switching between QDR I (1-cycle) and QDR II+ (2-cycle) operation.

Technical Context

The device implements a synchronous pipelined architecture with independent read and write ports sharing a multiplexed 21-bit address bus. Each port uses dedicated DDR interfaces synchronized to K (positive) and K (negative) clocks, with all data transfers referenced to rising edges only.

It integrates a PLL for precise data placement, supports depth expansion via RPS/WPS control, and provides QVLD for cycle-accurate output validity indication. ODT impedance range is selected by the ODT pin state during power-up, calibrated against ZQ-connected resistor values (175–350 Ω).

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm body height, RoHS-compliant Pb-free construction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-bandwidth dual-port SRAM applications.

Compared with IDT72T3615L10BG and ISSI IS61WV102418BLL-15BLI, CY7C25422KV18-333BZXI uniquely delivers 72-Mbit density with 333 MHz DDR timing, integrated ODT, and programmable latency - making it the sole option for new 10G+ packet processing designs requiring deterministic 2-cycle burst behavior.

Availability

CY7C25422KV18-333BZXI is available at Aetrix Electronics and suitable for high-speed network switching, telecom line cards, baseband processing units, and test & measurement equipment requiring stable component supply across multi-year production cycles.

Supply support for CY7C25422KV18-333BZXI 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 memory and programmable solutions for communications, industrial, and automotive markets, with focus on signal integrity and system-level integration.

The CY7C25422KV18 belongs to the QDR® II+ SRAM product line, engineered specifically for deterministic, low-latency packet buffering in multi-gigabit networking infrastructure where concurrent read/write bandwidth and timing predictability are critical.

FAQ

What is the function of the DOFF pin?

The DOFF pin controls the internal PLL operation: when pulled HIGH, the device operates in QDR II+ mode with 2.0-cycle read latency; when pulled LOW (to VSS), it disables the PLL and reverts to QDR I timing with 1.0-cycle latency and reduced maximum frequency (167 MHz). This allows backward compatibility with legacy timing controllers without hardware redesign.

How does On-Die Termination (ODT) work on this SRAM?

ODT applies programmable termination resistance to D[17:0], BWS[1:0], K, and K inputs using an internal resistor network calibrated against the ZQ pin's external reference resistor. The ODT pin selects between two ranges: LOW sets R_ODT ≈ R_Q/3.33 (175–350 Ω), HIGH sets R_ODT ≈ R_Q/1.66 (175–250 Ω), enabling impedance matching without external components.

Can CY7C25422KV18-333BZXI operate with VDDQ = 1.5 V?

Yes - the device supports VDDQ from 1.4 V to VDD (1.8 V), explicitly including 1.5 V operation. This allows interoperability with 1.5 V HSTL-compatible FPGAs and ASICs while maintaining full 333 MHz performance and signal integrity, as confirmed in the DC Electrical Characteristics table (Rev. *D, page 19).

What is the role of the QVLD signal in system timing?

QVLD is a synchronous output that asserts coincident with the first valid word of each two-word burst on Q[17:0]. It is edge-aligned to CQ/CQ, allowing receiving logic to latch data without fixed delay compensation or phase-locked loop-based deskew - reducing timing closure effort in high-speed FPGA interfaces.