Cypress Semiconductor Corp CY7C1562XV18-450BZC

Overview

CY7C1562XV18-450BZC from Cypress Semiconductor is a 72-Mbit QDR® II+ Xtreme SRAM with 4M × 18 organization, 450 MHz clock frequency, 2.5-cycle read latency, and dual DDR read/write ports delivering 900 MT/s effective data rate. It features separate read/write data paths, echo clocks (CQ/CQ), QVLD data-valid indicator, and operates at 1.8 V core / 1.5 V I/O for high-bandwidth networking buffer applications.

For engineers reviewing the CY7C1562XV18-450BZC datasheet, CY7C1562XV18-450BZC pinout, CY7C1562XV18-450BZC application, or CY7C1562XV18-450BZC equivalent, key selection criteria include burst depth, HSTL-15 I/O compatibility, PLL-enabled timing mode, and FBGA-165 package thermal/mechanical constraints in high-speed packet buffering systems.

Technical Context

This SRAM implements QDR II+ Xtreme architecture with fully independent synchronous read and write ports, each using DDR interfaces clocked by K (positive) and K (negative) inputs - all sampled on rising edges only. The device uses internal pipelined addressing with multiplexed A[20:0] bus latched alternately on K and K edges to support concurrent transactions without bus turnaround.

It integrates a programmable PLL for precise data placement and includes echo clocks (CQ/CQ) aligned to output data, plus QVLD for cycle-accurate data validity detection. DOFF pin selects between 2.5-cycle QDR-II+ mode (DOFF = HIGH) and 1-cycle QDR-I mode (DOFF = LOW), enabling flexible latency/bandwidth trade-offs in real-time memory subsystems.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm body, RoHS-compliant, with 0.8 mm ball pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C3256A-15JCIN and MT47H64M16HR-37E:H, CY7C1562XV18-450BZC delivers deterministic 2.5-cycle latency, true concurrency, and echo-clock–assisted timing - critical for real-time packet and sample buffering where jitter must be <100 ps.

Availability

CY7C1562XV18-450BZC is available at Aetrix Electronics and suitable for network packet buffering, high-speed test instrumentation, telecom baseband processing, and real-time video frame buffering requiring stable component supply across extended production lifecycles.

Supply support for CY7C1562XV18-450BZC 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 demanding embedded and communications applications.

CY7C1562XV18 belongs to the QDR® II+ Xtreme SRAM product line, engineered specifically for deterministic, low-latency, high-throughput memory interfacing in networking, test, and signal processing systems.

FAQ

What is the function of the DOFF pin on CY7C1562XV18-450BZC?

The DOFF pin disables the internal PLL when pulled LOW, switching the device to QDR-I timing mode with 1-cycle read latency and maximum 167 MHz operation. When held HIGH, the PLL remains active, enabling 2.5-cycle latency and full 450 MHz performance. Pull-up resistor ≤10 kΩ is required for normal operation.

How does the ZQ pin affect output drive strength?

ZQ calibrates output impedance by referencing an external resistor (RQ) tied between ZQ and ground; outputs are tuned to 0.2 × RQ. Connecting ZQ directly to VDDQ enables minimum impedance mode. ZQ must never be left floating or tied to GND, as this disables impedance control and risks signal integrity failure.

Can CY7C1562XV18-450BZC perform simultaneous read and write operations?

Yes - it supports true concurrent read and write operations using independent RPS and WPS controls. Each port has dedicated data lines (Q[17:0] for read, D[17:0] for write), eliminating bus turnaround and enabling full-duplex 900 MT/s throughput without arbitration delays.

What is the purpose of CQ and CQ echo clocks?

CQ and CQ are free-running output clocks synchronized to K and K respectively, edge-aligned with Q[17:0] data transitions. They provide precise timing references for external FPGA or ASIC capture logic, reducing setup/hold timing uncertainty and simplifying high-speed interface design at 450 MHz.