Cypress Semiconductor Corp CY7C1520V18-250BZC

Overview

CY7C1520V18 from Cypress Semiconductor is a 72-Mbit (2M × 36) synchronous pipelined DDR-II SRAM with 1.8V core supply, 300 MHz clock operation, and double-data-rate interface delivering 600 MT/s effective throughput. It implements 2-word burst architecture with echo clocks (CQ/CQ), DLL-based data alignment, and HSTL I/O for high-speed memory subsystems in network packet buffers and baseband signal processors.

For engineers reviewing the CY7C1520V18 datasheet, CY7C1520V18 pinout, CY7C1520V18 application, or CY7C1520V18 equivalent, key selection criteria include its 2M × 36 organization, 165-ball FBGA package, dual-clock timing (K/K and C/C), burst-controlled address sequencing via A0, and support for byte-level write masking via BWS[3:0].

Technical Context

This SRAM uses synchronous pipelined access with internal self-timed writes and DDR-II architecture: addresses are latched on alternating rising edges of K/K, while read data is driven on rising edges of C/C (or K/K in single-clock mode). The burst counter accepts A0 to sequence two 36-bit words per access.

All synchronous inputs (R/W, LD, BWS[3:0], A[20:0]) register on K/K edges; all outputs (DQ[35:0], CQ, CQ) register on C/C edges. Echo clocks CQ/CQ are free-running and phase-aligned to C/C, enabling precise source-synchronous capture without board-level skew compensation.

Key Specifications

Pinout & Package

165-ball Fine-Pitch Ball Grid Array (FBGA) package, 15 mm × 17 mm × 1.4 mm body height, RoHS-compliant with Pb-free option available.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed synchronous SRAM applications.

Compared with AS7C3256A-25JC and IS61WV102436BLL-25BLI, CY7C1520V18 delivers 2× density, 2.4× bandwidth, and integrated timing infrastructure-reducing FPGA logic overhead and PCB routing effort in new high-speed designs.

Availability

CY7C1520V18 is available at Aetrix Electronics and suitable for network packet buffering, baseband signal processing, telecom line card memory, and high-speed test equipment requiring stable component supply and long-term industrial availability.

Supply support for CY7C1520V18 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.

CY7C1520V18 belongs to Cypress's DDR-II SRAM product line, engineered specifically for low-latency, high-throughput buffering in networking and wireless infrastructure where deterministic timing and signal integrity are critical.

FAQ

What is the minimum supported clock frequency for CY7C1520V18?

The device operates down to DC for static functionality, but AC timing specifications-including setup/hold margins and DLL lock range-are guaranteed only at ≥100 MHz. For reliable DLL operation and echo clock alignment, use ≥150 MHz in production systems. Below this, DOFF must be asserted to bypass DLL-dependent timing paths.

Can CY7C1520V18 operate in single-clock mode without C and C inputs?

Yes-when C and C are tied to K and K respectively, the device enters single-clock mode. In this configuration, read data is driven on K/K rising edges, and CQ/CQ are generated relative to K/K. All timing parameters shift to single-edge referenced values per the datasheet's "Single Clock Mode" table.

How does ZQ calibration affect signal integrity on DQ and CQ pins?

ZQ calibration adjusts the output driver impedance of DQ[35:0] and CQ/CQ to match the system's characteristic impedance (typically 50Ω). With a 240Ω resistor to ground, drivers settle to 48Ω ±10%, reducing reflections and improving eye height at 600 MT/s-critical for maintaining >0.3 UI eye opening in FR4 PCBs.

Is CY7C1520V18 pin-compatible with other devices in the CY7C15xxV18 family?

No-while all share the same 165-ball FBGA footprint, pin functions differ significantly across densities. For example, CY7C1516V18 uses NWS[1:0], whereas CY7C1520V18 uses BWS[3:0]; A0 serves as burst counter input only in CY7C1518V18/CY7C1520V18. Direct replacement requires full schematic and layout revision.