Infineon Technologies CY7C1565KV18-550BZXC

Overview

CY7C1565KV18-550BZXC from Cypress Semiconductor is a 72-Mbit QDR® II+ SRAM with 2M × 36 organization, 550-MHz clock frequency, 2.5-cycle read latency, and separate read/write DDR ports. It delivers 1100-MHz data transfer on both ports using K/K input clocks and echo clocks CQ/CQ, enabling concurrent high-bandwidth memory access in network packet buffers and switch fabric controllers.

For engineers reviewing the CY7C1565KV18-550BZXC datasheet, CY7C1565KV18-550BZXC pinout, CY7C1565KV18-550BZXC application, or CY7C1565KV18-550BZXC equivalent, key selection criteria include its 1.8-V core / 1.4–1.8-V I/O supply range, JTAG 1149.1 compliance, PLL-based timing control, and DOFF-pin-selectable QDR I (1-cycle) vs. QDR II+ (2.5-cycle) latency modes.

Technical Context

The CY7C1565KV18-550BZXC implements a true quad data rate architecture with physically independent read and write data paths-no bus turnaround required. Its four-word burst transfers 144 bits per access cycle across two rising edges of K and K, achieving full data coherency via synchronous pipelined addressing and self-timed writes.

Internal operation relies on dual-edge-synchronized registers: all inputs (D[35:0], RPS, WPS, BWS[3:0], A[18:0]) are latched on K/K rising edges; all outputs (Q[35:0], QVLD, CQ, CQ) are edge-aligned to those same clocks. The integrated PLL ensures precise data placement, while ZQ enables dynamic output impedance tuning to match system trace impedance.

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 dual-port SRAM applications.

Compared with IDT72T36150L10BG and AS7C362000B-15PCCN, CY7C1565KV18-550BZXC uniquely supports flexible I/O voltage (1.4–1.8 V), on-die impedance tuning (ZQ), and runtime latency mode switching (via DOFF), making it optimal for adaptive, high-integrity telecom and test equipment designs.

Availability

CY7C1565KV18-550BZXC is available at Aetrix Electronics and suitable for network packet buffering, switch fabric controller memory, and telecom baseband processing requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for CY7C1565KV18-550BZXC 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 networking, automotive, and industrial applications, with emphasis on signal integrity and system-level timing robustness.

The CY7C1565KV18 belongs to Cypress's QDR® II+ SRAM product line, engineered specifically for deterministic, full-duplex memory access in multi-gigabit packet processing and real-time signal conditioning systems.

FAQ

What is the function of the DOFF pin on CY7C1565KV18-550BZXC?

The DOFF pin is an active-LOW PLL disable input. When pulled LOW, it disables the internal PLL and forces the device into QDR I mode with 1-cycle read latency and maximum operating frequency of 167 MHz. When held HIGH (typically via 10-kΩ pull-up), the device operates in QDR II+ mode at up to 550 MHz with 2.5-cycle latency. This pin enables runtime mode selection without changing clocking infrastructure.

How does the ZQ pin affect signal integrity in high-speed designs?

The ZQ pin connects to an external resistor to ground (RQ) to calibrate the output driver impedance of Q[35:0], CQ, and CQ pins to 0.2 × RQ. This dynamic impedance matching minimizes reflections on high-speed data and echo clock lines, reducing eye closure and jitter without requiring discrete series termination resistors on the PCB.

Can CY7C1565KV18-550BZXC support partial-word writes, and how is this implemented?

Yes - it supports byte-level writes via four active-LOW byte write select signals: BWS0 controls D[8:0], BWS1 controls D[17:9], BWS2 controls D[26:18], and BWS3 controls D[35:27]. Each BWS signal gates its corresponding 9-bit lane during write operations; deselected bytes retain prior values, enabling efficient update of metadata or control fields without full-word overwrites.

What role do CQ and CQ echo clocks play in system timing design?

CQ and CQ are free-running, phase-aligned copies of the K and K input clocks, respectively. They provide receiver-side timing references that track source-clock jitter and skew, allowing FPGA or ASIC capture logic to sample Q[35:0] data with relaxed setup/hold margins. Their presence eliminates need for complex delay-locked loops or manual deskew circuitry in high-speed interfaces.