Infineon Technologies CY7C1565KV18-400BZC

Overview

CY7C1565KV18-400BZC from Cypress Semiconductor is a 72-Mbit QDR® II+ SRAM with 2M × 36 organization, 400 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 compatible with 1.4 V–1.8 V VDDQ for high-bandwidth packet buffering in network line cards.

For engineers reviewing the CY7C1565KV18-400BZC datasheet, CY7C1565KV18-400BZC pinout, CY7C1565KV18-400BZC application, or CY7C1565KV18-400BZC equivalent, key selection criteria include burst depth (four 36-bit words), echo clock support (CQ/CQ), QVLD timing alignment, and PLL-enabled 2.5-cycle latency mode versus QDR I fallback at DOFF = LOW.

Technical Context

The device implements a true quad data rate architecture with independent read and write ports sharing one multiplexed address bus, eliminating bus turnaround overhead. Each port uses DDR signaling synchronized to K (positive) and K̄ (negative) clocks, with all synchronous inputs and outputs registered to rising edges of those clocks.

Internal operation relies on a phase-locked loop (PLL) for precise data placement when DOFF = HIGH, enabling 2.5-cycle read latency and full coherency across four-word bursts. When DOFF = LOW, the PLL is disabled and the device reverts to QDR I timing with 1-cycle latency and reduced max frequency (≤167 MHz).

Key Specifications

Pinout & Package

Package: 165-ball fine-pitch ball grid array (FBGA), 13 mm × 15 mm × 1.4 mm body height, 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 IS61WV102436B, CY7C1565KV18-400BZC uniquely delivers guaranteed 400 MHz operation with echo-clock–assisted timing closure and deterministic 2.5-cycle latency - making it the only viable option for line-rate packet buffering in next-gen 25G+ infrastructure.

Availability

CY7C1565KV18-400BZC is available at Aetrix Electronics and suitable for network line cards, telecom baseband units, and high-speed test equipment requiring stable component supply, long-lifecycle assurance, and Pb-free manufacturing compliance.

Supply support for CY7C1565KV18-400BZC 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 timing precision.

The CY7C1565KV18 belongs to Cypress's QDR II+ SRAM product line, engineered specifically for deterministic, low-jitter, high-throughput memory interfacing in packet-switched infrastructure where bus turnaround and latency predictability are critical.

FAQ

What is the function of the DOFF pin, and how does it affect timing?

The DOFF pin disables the internal PLL when asserted LOW. In this state, the device operates in QDR I mode with 1-cycle read latency and a maximum frequency of 167 MHz. When DOFF = HIGH, the PLL is active, enabling 2.5-cycle latency and full 400 MHz operation. Timing parameters differ significantly between modes - the datasheet provides separate AC tables for each configuration.

How does the ZQ pin configure output drive strength?

ZQ connects to an external 50 Ω resistor to ground, enabling automatic calibration of CQ, CQ̄, and Q[35:0] output impedance to 0.2 × RQ (i.e., 10 Ω). If tied directly to VDDQ, the device enters minimum-impedance mode (~7 Ω). ZQ must never be left floating or tied to GND, as this disables calibration and risks signal integrity failure.

Can RPS and WPS be asserted simultaneously, and what happens during overlap?

Yes - RPS and WPS may be asserted concurrently. The device guarantees full data coherency: a read initiated in the same cycle as a write to the same address returns the most recently written data after the write completes. This behavior is enabled by internal pipelining and self-timed write circuitry, not by external arbitration.

What is the role of QVLD, and how is it timed relative to CQ/CQ̄?

QVLD is an output strobe edge-aligned to CQ and CQ̄, indicating that the corresponding Q[35:0] word is valid and stable. It asserts one cycle before the first data word in a burst and remains active for all four words. Its timing is specified in the "Switching Characteristics" table (page 23 of datasheet) and must be used to qualify data capture in FPGA logic.