Infineon Technologies CY7C1425JV18-250BZI

Overview

CY7C1425JV18 from Cypress Semiconductor is a 36-Mbit QDR-II SRAM with 4M × 9 organization, dual independent read/write ports, 267 MHz operation (534 Mbps DDR data rate), 1.8V core supply, and 165-ball FBGA package. It delivers concurrent high-bandwidth memory access for network packet buffering in telecom line cards.

For engineers reviewing the CY7C1425JV18 datasheet, CY7C1425JV18 pinout, CY7C1425JV18 application, or CY7C1425JV18 equivalent, key selection criteria include burst-2 QDR-II timing, HSTL I/O compatibility, DLL-enabled 1.5-cycle read latency, and x9 byte-write select support for partial writes in packet header processing.

Technical Context

The CY7C1425JV18 implements true dual-port synchronous pipelined architecture: separate K/K clocks latch write addresses and data, while C/C clocks control read data output timing. Its Delay Lock Loop (DLL) aligns echo clocks CQ/CQ to input clocks for precise 534 MHz data capture at system level.

All operations are fully synchronous with rising-edge-triggered registers; write port uses self-timed internal circuitry, and read port supports 1-cycle latency (DLL off) or 1.5-cycle latency (DLL on). Address bus is multiplexed, with 21-bit A[20:0] supporting 4M-depth addressing across two 2M×9 arrays.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 mm × 1.4 mm, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3615L10BG and IS61WV102418B, CY7C1425JV18 uniquely supports DLL-on/off mode switching, 267 MHz operation, and full x9 byte-write granularity - making it optimal for upgrade paths from QDR-I and mixed-protocol system integration.

Availability

CY7C1425JV18 is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, baseband processing memory, and high-speed test equipment requiring stable component supply and long-term obsolescence management.

Supply support for CY7C1425JV18 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) is a fabless semiconductor company specializing in high-performance memory, microcontrollers, and connectivity solutions for industrial, automotive, and communications markets.

CY7C1425JV18 belongs to Cypress's QDR-II SRAM product line, engineered specifically for deterministic, low-latency, high-throughput memory interfacing in networking and telecom infrastructure where concurrent read/write bandwidth is critical.

FAQ

What is the function of the DOFF pin on CY7C1425JV18?

The DOFF (DLL Turn Off) pin is an active-low input that disables the internal Delay Lock Loop. When pulled low, the device reverts to QDR-I timing with 1-cycle read latency and a maximum operating frequency of 167 MHz. For normal QDR-II operation, DOFF must be pulled up via a ≤10 kΩ resistor to VDDQ.

How does the ZQ pin affect output drive strength?

The ZQ pin connects to an external precision resistor (typically 100 Ω) to ground, enabling automatic output impedance calibration. This adjusts the drive strength of Q[8:0], CQ, and CQ outputs to precisely 50 Ω (0.2 × RQ), ensuring signal integrity on controlled-impedance PCB traces without manual termination design.

Can CY7C1425JV18 operate with only a single clock domain?

Yes - the device supports single-clock-mode operation where K and C are tied together (and K and C likewise), allowing simplified timing with FPGAs lacking differential clock routing. In this mode, data is clocked on K/K edges for both read and write, and echo clocks CQ/CQ derive from K/K instead of C/C.

What is the purpose of BWS0 in the x9 configuration?

BWS0 is the sole byte write select for the 9-bit data path. When asserted low, it enables writing all 9 bits of D[8:0] to the addressed location; when high, the write is inhibited. Unlike nibble-select variants, BWS0 provides atomic 9-bit write control - essential for error-free header updates in packet-processing pipelines.