Cypress Semiconductor Corp CY7C1525JV18-250BZC

Overview

CY7C1525JV18 from Cypress Semiconductor is an 8M × 9 (72-Mbit) QDR® II SRAM with separate read/write ports, 267 MHz operation, DDR interfaces on both ports (534 Mbps effective data rate), and 1.5-cycle read latency with DLL enabled. It delivers concurrent high-bandwidth memory access for network packet buffering in telecom line cards.

For engineers reviewing the CY7C1525JV18 datasheet, CY7C1525JV18 pinout, CY7C1525JV18 application, or CY7C1525JV18 equivalent, key selection criteria include its dual-clock DDR timing architecture, HSTL I/O compliance, 165-ball FBGA package, and support for depth expansion via RPS/WPS control - all critical for deterministic low-latency buffer design.

Technical Context

The CY7C1525JV18 implements a synchronous pipelined QDR II architecture with physically independent read and write data paths, eliminating bus turnaround overhead. Its dual-input clock system (K/K for address/control/data capture; C/C for output timing) enables precise skew management across high-speed PCB traces.

It uses echo clocks (CQ/CQ) referenced to C/C for source-synchronous data capture at the controller, and supports DLL-enabled 1.5-cycle read latency or DLL-off QDR I mode (1-cycle latency, ≤167 MHz). Address inputs are multiplexed and latched on alternating K-clock edges for read/write port separation.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 mm × 1.4 mm body, 1.0 mm ball pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T36150L10BG and IS61WV102418B, CY7C1525JV18 uniquely delivers 72-Mbit density, 267 MHz DDR operation, echo-clock–assisted capture, and HSTL-18 compatibility - making it the sole fit for deterministic, full-duplex 10Gbps+ packet buffering.

Availability

CY7C1525JV18 is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, FPGA-based protocol acceleration, and high-speed test equipment requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.

Supply support for CY7C1525JV18 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 U.S.-based semiconductor company specializing in high-performance memory, microcontrollers, and connectivity solutions for industrial, automotive, and communications markets.

The QDR® II SRAM product line was engineered specifically for deterministic, low-latency, high-throughput buffering in networking infrastructure - targeting core router, switch, and base station applications demanding concurrent read/write bandwidth.

FAQ

What is the function of the DOFF pin?

The DOFF pin disables the internal Delay Lock Loop when pulled LOW. In this state, the device operates in QDR I mode with 1-cycle read latency and a maximum frequency of 167 MHz. When DOFF is HIGH (via 10 kΩ pull-up), the DLL is active, enabling 1.5-cycle latency and full 267 MHz operation. This pin provides hardware-selectable timing modes without firmware intervention.

How does the ZQ pin affect signal integrity?

The ZQ pin connects to an external 240 Ω resistor to ground to calibrate the output driver impedance of Q[8:0], CQ, and CQ pins to 50 Ω (0.2 × 240 Ω). This matching minimizes reflections and ensures clean eye diagrams at 534 Mbps DDR rates. Leaving ZQ unconnected or tying it to GND violates HSTL-18 specifications and causes signal degradation.

Can CY7C1525JV18 be used with a single clock domain?

Yes - the device supports single-clock mode by connecting K to C and K to C. In this configuration, all data input and output timing references shift to the K/K clocks, eliminating the need for separate C/C generation. However, echo clocks (CQ/CQ) remain referenced to C/C, so they must still be generated or disabled per system requirements.

What is the role of BWS0 in write operations?

BWS0 is the byte write select signal for the full 9-bit D[8:0] data bus. When asserted LOW, it enables writing the entire 9-bit word to the addressed location. When HIGH, the corresponding write operation is ignored, preserving existing memory contents. It is sampled synchronously with D[8:0] on the rising edge of K and is only active when WPS is asserted.