Cypress Semiconductor Corp CY7C1562XV18-366BZC

Overview

CY7C1562XV18-366BZC from Cypress Semiconductor is a 4M × 18 (72-Mbit), 1.8 V core, QDR® II+ Xtreme SRAM with separate read/write ports, 2.5-cycle read latency, 450 MHz clock support, and DDR interfaces delivering 900 MT/s data rate. It enables high-bandwidth packet buffering in network line cards and telecom switching fabric where concurrent read/write operations at 450 MHz are required.

For engineers reviewing the CY7C1562XV18-366BZC datasheet, CY7C1562XV18-366BZC pinout, CY7C1562XV18-366BZC application, or CY7C1562XV18-366BZC equivalent, key selection criteria include burst depth (2-word), DOFF-controlled latency mode (2.5-cycle vs. 1-cycle), HSTL I/O compatibility (1.4–1.6 V VDDQ), echo clock timing (CQ/CQ), and JTAG 1149.1 test access.

Technical Context

The device implements a synchronous pipelined architecture with independent read and write ports sharing a multiplexed 21-bit address bus. Address latching occurs on alternating rising edges of K and K clocks, enabling full concurrency without bus turnaround.

It integrates a PLL for precise data placement and supports two operational modes: QDR-II+ mode (DOFF = HIGH, 2.5-cycle latency, up to 450 MHz) and QDR-I mode (DOFF = LOW, 1-cycle latency, up to 167 MHz). Echo clocks CQ and CQ are free-running and edge-aligned to K/K for simplified high-speed capture.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm body, 0.8 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 AS7C36256PFS-15BIN and MT47H64M16HR-37E, CY7C1562XV18-366BZC delivers guaranteed 2.5-cycle latency, zero-refresh operation, and true concurrent access-critical for real-time packet processing where jitter and arbitration delay are unacceptable.

Availability

CY7C1562XV18-366BZC is available at Aetrix Electronics and suitable for network packet buffering, telecom switch fabric, and baseband processing applications requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for CY7C1562XV18-366BZC 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 memory, microcontrollers, and connectivity solutions for industrial, automotive, and communications markets.

CY7C1562XV18 belongs to the QDR® II+ Xtreme SRAM product line, engineered specifically for deterministic, high-throughput memory interfacing in networking and telecom infrastructure where bus turnaround elimination and sub-3-cycle latency are mandatory.

FAQ

What is the function of the DOFF pin?

The DOFF pin controls the internal PLL: when pulled HIGH, the device operates in QDR-II+ mode with 2.5-cycle read latency and supports up to 450 MHz; when pulled LOW, it disables the PLL and reverts to QDR-I mode with 1-cycle latency and a maximum frequency of 167 MHz. This allows backward compatibility and flexible timing tuning without changing hardware layout.

How does the two-word burst architecture improve system performance?

The two-word burst reduces address bus activity by half compared to single-word access-each clock cycle transfers two consecutive 18-bit words from one address location. This cuts address decode complexity, lowers PCB routing congestion, and maintains full 900 MT/s bandwidth while easing timing closure on the address path, especially in dense FPGA-based systems.

Can CY7C1562XV18-366BZC be used with 1.5 V I/O voltage?

Yes. The device specifies VDDQ = 1.4 V to 1.6 V, making 1.5 V fully compliant. Its HSTL-compatible I/O buffers are designed for this range, and output drive strength can be calibrated using the ZQ pin connected to an external resistor to ground-ensuring signal integrity across process/voltage/temperature corners.

What is the role of CQ and CQ echo clocks?

CQ and CQ are free-running, edge-aligned echo clocks synchronized to K and K respectively. They provide a clean, low-skew reference for capturing Q[17:0] data in the receiving FPGA or ASIC-eliminating the need for complex phase alignment circuitry and enabling robust 900 MT/s DDR data recovery without additional PLLs or delay-locked loops.