Infineon Technologies CY7C1425AV18-250BZXC

Overview

CY7C1425AV18-250BZXC from Cypress Semiconductor is a 4M × 9 (36-Mbit) QDR-II™ SRAM with separate read/write ports, 250-MHz clock operation, DDR interfaces on both ports (500-MHz data rate), and 165-ball FBGA (15 × 17 × 1.4 mm) packaging. It delivers concurrent high-bandwidth memory access for network packet buffering in telecom line cards.

For engineers reviewing the CY7C1425AV18-250BZXC datasheet, CY7C1425AV18-250BZXC pinout, CY7C1425AV18-250BZXC application, or CY7C1425AV18-250BZXC equivalent, key selection criteria include its 2-word burst architecture, HSTL I/O compatibility, DLL-enabled timing accuracy, and dual-clock domain support for skew-critical backplane interfaces.

Technical Context

The device implements a synchronous pipelined QDR-II architecture with physically independent read and write data paths-eliminating bus turnaround and enabling true concurrent access. Address latching occurs on rising edges of dedicated K (read) and K̄ (write) clocks, while output data is synchronized to C/C̄ echo clocks for precise capture in high-speed systems.

It integrates a Delay Lock Loop (DLL) for sub-cycle data alignment, supports variable-drive HSTL output buffers, and uses a single multiplexed address bus shared across both ports. Write operations are self-timed internally, and depth expansion is enabled via independent RPS/WPS and byte-level BWS[0] control.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 mm × 1.4 mm body height, 0.8 mm ball pitch, lead-free compatible.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C33680B-250BIN and IS61WV102418BLL-250BLI, the CY7C1425AV18-250BZXC uniquely delivers true 500-MT/s full-duplex bandwidth in a mature, pin-stable QDR-II implementation-making it optimal for field-deployed telecom infrastructure requiring long-term supply continuity and proven thermal reliability.

Availability

CY7C1425AV18-250BZXC is available at Aetrix Electronics and suitable for network packet buffering, switch fabric lookup tables, baseband processing memory, and test equipment pattern memory requiring stable component supply across extended product lifecycles.

Supply support for CY7C1425AV18-250BZXC 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 systems, with headquarters in San Jose, CA.

The QDR-II SRAM product line targets high-speed networking and datacom applications demanding deterministic latency, concurrent access, and DDR bandwidth-specifically engineered for line card and switch fabric memory subsystems.

FAQ

What is the function of the ZQ pin on CY7C1425AV18-250BZXC?

The ZQ pin calibrates output driver impedance to match the system data bus. When connected to a 240 Ω resistor to ground, it sets Q[8:0] and CQ/CQ̄ output impedance to 48 Ω (0.2 × 240 Ω), ensuring minimal reflection on 50 Ω transmission lines. Direct connection to VDDQ enables minimum impedance mode; floating or grounding ZQ is prohibited.

Can CY7C1425AV18-250BZXC operate in single-clock mode?

Yes-it supports single-clock mode using only K and C inputs, with K̄ and C̄ tied to appropriate logic levels. In this configuration, K serves as the master clock for both read and write address latching, and C clocks all output data. The DLL remains active, preserving timing accuracy, but echo clock deskew capability is reduced compared to dual-clock operation.

How does the BWS0 signal differ from NWS0/NWS1 in CY7C1410AV18?

BWS0 in CY7C1425AV18 controls all 9 data bits as a single byte-select signal, whereas CY7C1410AV18 uses NWS0/NWS1 to independently enable D[3:0] and D[7:4] nibbles. This simplifies write masking logic for 9-bit interfaces but removes granular 4-bit write capability-making CY7C1425AV18 better suited for parity-inclusive or ECC-enabled systems.

Is the DOFF pin required for normal operation?

No-DOFF is optional. When left unconnected or pulled HIGH, the internal DLL operates normally for precise data alignment. Pulling DOFF LOW disables the DLL, reverting to fixed-delay output timing; this increases setup/hold margin requirements and limits maximum operating frequency to 200 MHz, so it is recommended only for debug or legacy timing validation.