Infineon Technologies CY7C1565KV18-450BZXC

Overview

CY7C1565KV18-450BZXC from Cypress Semiconductor is a 72-Mbit QDR® II+ SRAM with 2M × 36 organization, 450 MHz maximum clock frequency, 2.5-cycle read latency (DOFF = HIGH), and 165-ball FBGA (13 × 15 × 1.4 mm) package. It features separate read/write ports, DDR interfaces on both ports (2.2 Gbps effective data rate), and HSTL I/O with VDDQ = 1.4–1.8 V. Used in high-bandwidth packet buffering for network line cards and telecom switching fabric.

For engineers reviewing the CY7C1565KV18-450BZXC datasheet, CY7C1565KV18-450BZXC pinout, CY7C1565KV18-450BZXC application, or CY7C1565KV18-450BZXC equivalent, key selection criteria include burst depth (4-word), PLL-enabled timing control (K/K, CQ/CQ), QVLD data validity signaling, and byte-write select (BWS[3:0]) granularity for partial writes in multi-protocol memory systems.

Technical Context

The device implements true quad data rate architecture via independent read/write ports with fully pipelined, synchronous operation. All inputs (A[18:0], D[35:0], RPS, WPS, BWS[3:0]) are registered on rising edges of K or K clocks, and all outputs (Q[35:0], QVLD, CQ, CQ) are edge-aligned to those clocks. The internal 512K × 36 × 4 array enables four sequential 36-bit word bursts per access.

PLL-based clock synthesis ensures precise data placement relative to echo clocks (CQ/CQ), supporting reliable capture at 1100 MT/s. DOFF pin selects between QDR II+ mode (2.5-cycle latency, up to 450 MHz) and legacy QDR I mode (1-cycle latency, ≤167 MHz). ZQ pin enables programmable output impedance matching to system bus termination.

Key Specifications

Pinout & Package

165-ball fine-pitch ball grid array (FBGA), 13 mm × 15 mm × 1.4 mm body, 0.8 mm ball pitch, RoHS-compliant Pb-free option available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T36150L10BG and IS61WV102436B, CY7C1565KV18-450BZXC provides unique combination of programmable impedance (ZQ), data validity signaling (QVLD), and dual-mode latency (DOFF-selectable), making it optimal for next-generation telecom and test equipment where signal integrity and timing determinism are non-negotiable.

Availability

CY7C1565KV18-450BZXC 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 guaranteed Pb-free compliance.

Supply support for CY7C1565KV18-450BZXC 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 systems, with emphasis on signal integrity and timing precision.

CY7C1565KV18 belongs to the QDR® II+ SRAM product line, engineered specifically for deterministic, high-bandwidth memory access in packet-switched infrastructure where concurrent read/write and sub-nanosecond timing control are critical.

FAQ

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

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 clock frequency; when pulled LOW, the PLL is disabled and the device reverts to QDR I timing with 1-cycle latency and a maximum clock rate of 167 MHz. This dual-mode capability allows hardware-level performance scaling and debug flexibility without changing firmware or PCB layout.

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

The ZQ pin connects to an external 240 Ω resistor to ground to calibrate the output driver impedance of Q[35:0], CQ, and CQ pins to precisely 50 Ω (0.2 × RQ). This eliminates reflections and ensures consistent edge rates across all 36 data lines and two echo clocks, reducing bit error rates in systems operating above 400 MHz without requiring discrete series termination resistors.

Can CY7C1565KV18-450BZXC perform simultaneous read and write operations to the same address?

No - while the device supports concurrent read and write operations to *different* addresses (due to independent RPS/WPS control), writing to an address currently being read from results in undefined data on Q[35:0] for that burst. The architecture guarantees coherency only for non-overlapping accesses; overlapping reads/writes to identical locations are not supported and must be managed by external arbitration logic.

What is the purpose of the QVLD signal, and how is it timed relative to data?

QVLD is a synchronous output that asserts coincident with the first valid 36-bit word of each four-word read burst and remains asserted for all subsequent words in that burst. It is edge-aligned to both CQ and CQ clocks, providing a zero-jitter, zero-skew timing reference for external latches - eliminating the need for manual delay tuning or adaptive deskew circuits in high-speed capture logic.