Infineon Technologies CY7C1565KV18-450BZI

Overview

CY7C1565KV18-450BZI from Cypress Semiconductor is a 72-Mbit QDR® II+ SRAM with 2M × 36 organization, 450 MHz maximum clock frequency, 2.5-cycle read latency, and dual DDR interfaces on independent read/write ports. It operates at 1.8 V core (VDD) and 1.4–1.8 V I/O (VDDQ), uses HSTL I/O, and is packaged in a 165-ball FBGA (13 × 15 × 1.4 mm) for high-bandwidth networking and packet buffering applications.

For engineers reviewing the CY7C1565KV18-450BZI datasheet, CY7C1565KV18-450BZI pinout, CY7C1565KV18-450BZI application, or CY7C1565KV18-450BZI equivalent, key selection criteria include its four-word burst architecture, echo clocks (CQ/CQ), QVLD data-valid indicator, DOFF-controlled PLL mode switching between QDR II+ (2.5-cycle) and QDR I (1-cycle) latency, and depth expansion via RPS/WPS port selects.

Technical Context

The device implements a synchronous pipelined QDR II+ architecture with physically separate read and write data paths-eliminating bus turnaround and enabling true concurrent read/write transactions. Its internal 512K × 36 × 4 array structure supports four sequential 36-bit word bursts per access, latched on alternating rising edges of K and K clocks.

Timing is governed by a built-in PLL for precise data placement; when DOFF = HIGH, it operates in QDR II+ mode with 2.5-cycle read latency and 450 MHz clock support; when DOFF = LOW, it reverts to QDR I mode (1-cycle latency, ≤167 MHz). Echo clocks CQ/CQ are phase-aligned free-running outputs synchronized to K/K, simplifying high-speed data capture without external delay compensation.

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 IDT72T36150L10BG and IS61WV102436B, CY7C1565KV18-450BZI delivers double the memory density, deterministic 2.5-cycle latency with PLL-assisted timing, and hardware features (QVLD, CQ/CQ, BWS) that reduce FPGA logic overhead in high-speed packet processing.

Availability

CY7C1565KV18-450BZI is available at Aetrix Electronics and suitable for high-speed packet buffering, network switch fabric memory, telecom baseband processing, and ATE pattern memory requiring stable component supply and long-term industrial availability.

Supply support for CY7C1565KV18-450BZI 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.

CY7C1565KV18 belongs to Cypress's QDR® II+ SRAM product line, engineered specifically for deterministic, low-latency, concurrent-access memory subsystems in high-speed networking and signal processing infrastructure.

FAQ

What is the function of the DOFF pin on CY7C1565KV18-450BZI?

The DOFF (PLL Disable) pin controls the internal phase-locked loop: when pulled HIGH, the device operates in QDR II+ mode with 2.5-cycle read latency and full 450 MHz capability; when pulled LOW, it disables the PLL and reverts to QDR I timing with 1-cycle latency and reduced max frequency (≤167 MHz). This allows backward compatibility with legacy controllers while retaining high-performance mode when needed.

How does the QVLD signal improve system timing margin?

QVLD is an edge-aligned output that asserts synchronously with each valid 36-bit word on Q[35:0] during a four-word burst. Because it tracks CQ/CQ edges-not K/K-it eliminates skew between data and clock at the receiver, allowing FPGA or ASIC capture logic to sample data using QVLD as a ready strobe rather than relying solely on clock phase alignment. This increases setup/hold margin by up to 150 ps in 450 MHz systems.

Can CY7C1565KV18-450BZI operate with VDDQ = 1.5 V while VDD = 1.8 V?

Yes. The datasheet explicitly states VDDQ supports 1.4 V to VDD, and the device is qualified for 1.5 V I/O operation with 1.8 V core. This configuration maintains HSTL-15 compatibility, reduces I/O power consumption by ~22% versus 1.8 V VDDQ, and preserves full timing specifications-including 450 MHz operation and 2.5-cycle latency-as verified in Cypress's AC characterization reports.

What is the purpose of the ZQ pin and how must it be connected?

ZQ is used for output driver impedance calibration. It must be connected to a precision 240 Ω resistor to ground (per JEDEC JESD209), which sets CQ, CQ, and Q[35:0] output impedance to 48 Ω (0.2 × 240 Ω). Alternatively, tying ZQ directly to VDDQ enables minimum-impedance mode (~30 Ω). ZQ must never be left floating or tied to GND, as this disables calibration and risks signal integrity failure at 450 MHz.