Infineon Technologies CY7C1565KV18-500BZXC

Overview

CY7C1565KV18-500BZXC from Cypress Semiconductor is a 72-Mbit QDR® II+ SRAM with 2M × 36 organization, 500 MHz maximum clock frequency, 2.5-cycle read latency (DOFF = HIGH), and dual DDR interfaces on independent read/write ports. It delivers 1100 MT/s data transfer rate, operates at 1.8 V core / 1.4–1.8 V I/O, and is packaged in a 165-ball FBGA (13 × 15 × 1.4 mm) for high-bandwidth networking buffer applications.

For engineers reviewing the CY7C1565KV18-500BZXC datasheet, CY7C1565KV18-500BZXC pinout, CY7C1565KV18-500BZXC application, or CY7C1565KV18-500BZXC equivalent, key selection criteria include burst depth (four 36-bit words), echo clock support (CQ/CQ), QVLD timing indicator, PLL-based data alignment, and byte-write select (BWS[3:0]) granularity for partial writes.

Technical Context

The CY7C1565KV18-500BZXC implements a true quad data rate architecture with physically separate read and write data paths-eliminating bus turnaround overhead. Its internal 512K × 36 × 4 array structure enables concurrent read/write operations on the same address bus, latched alternately on rising edges of K and K clocks.

It integrates a phase-locked loop (PLL) for precise output data placement relative to echo clocks CQ/CQ, supports programmable output impedance via ZQ calibration, and provides synchronous self-timed writes with full data coherency. The DOFF pin selects between QDR II+ (2.5-cycle latency, up to 550 MHz) and QDR I (1-cycle latency, ≤167 MHz) operation modes.

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 QDR II+ SRAM applications.

Compared with IDT72T3615L5PF and IS61WV102436B, the CY7C1565KV18-500BZXC uniquely balances 500 MHz operation, programmable latency (via DOFF), and on-die impedance tuning - making it the only option among the three that supports both high-speed data plane buffering and robust signal integrity across varying PCB environments.

Availability

CY7C1565KV18-500BZXC is available at Aetrix Electronics and suitable for high-speed packet buffering, network switch fabric memory, and telecom line card buffering requiring stable component supply and long-term industrial availability.

Supply support for CY7C1565KV18-500BZXC 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 fabless semiconductor company specializing in high-performance memory, microcontrollers, and connectivity solutions for industrial, automotive, and communications markets.

The CY7C1565KV18 belongs to Cypress's QDR® II+ SRAM product line, engineered specifically for deterministic, low-latency, full-duplex memory access in packet-switched infrastructure - targeting wireline and wireless base station applications demanding >10 Gbps sustained throughput.

FAQ

What is the function of the DOFF pin on CY7C1565KV18-500BZXC?

The DOFF pin controls the internal PLL: when asserted LOW, it disables the PLL and forces the device into QDR I mode with 1-cycle read latency and reduced maximum frequency (≤167 MHz). When tied HIGH (e.g., via 10 kΩ pull-up), the PLL is active, enabling QDR II+ mode with 2.5-cycle latency and full 500 MHz operation. This pin allows hardware-selectable latency/performance trade-offs without firmware changes.

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

The ZQ pin connects to an external precision resistor (typically 50 Ω to ground) to calibrate the output driver impedance of Q[35:0], CQ, and CQ pins to 0.2 × RQ (i.e., ~10 Ω). This matches standard 50 Ω transmission lines, minimizing reflections and ensuring clean eye diagrams at 500 MHz. Leaving ZQ unconnected or tying it to GND violates specifications and causes unpredictable drive strength.

Can CY7C1565KV18-500BZXC perform simultaneous read and write to the same memory location?

Yes - the device guarantees full data coherency during concurrent access: if a write to an address occurs in the same cycle as a read from that same address, the read returns the newly written data. This behavior is ensured by internal pipelining and synchronous self-timed write circuitry, eliminating the need for external arbitration logic in applications like real-time statistics counters.

What is the role of the QVLD signal in system timing validation?

QVLD is a synchronous, edge-aligned output that pulses high exactly when valid data appears on Q[35:0], synchronized to CQ/CQ edges. It serves as a hardware-valid strobe for FPGA/ASIC input registers - replacing complex timing margin calculations with a deterministic capture enable, especially critical when operating near the 500 MHz limit where setup/hold margins shrink below 100 ps.