Cypress Semiconductor Corp CY7C1665KV18-450BZXC

Overview

CY7C1665KV18-450BZXC from Cypress Semiconductor is a 4-M × 36-bit, 144-Mbit QDR® II+ SRAM with 2.5-cycle read latency, 450 MHz clock operation (900 Mbps DDR data rate), HSTL I/O, and 165-ball FBGA (15 × 17 × 1.4 mm) package. It features independent read/write ports, echo clocks (CQ/CQ), QVLD data-valid indicator, and programmable impedance via ZQ pin for high-speed memory subsystems in networking switches and packet buffers.

For engineers reviewing the CY7C1665KV18-450BZXC datasheet, CY7C1665KV18-450BZXC pinout, CY7C1665KV18-450BZXC application, or CY7C1665KV18-450BZXC equivalent, key selection criteria include 450 MHz sustained clock frequency, 2.5-cycle read latency mode, ×36 data width, DOFF-controlled PLL enable/disable, and JTAG 1149.1 test access compliance.

Technical Context

The CY7C1665KV18 implements QDR II+ architecture with fully independent read and write ports sharing a multiplexed address bus. Read and write operations are synchronized to complementary K/K clocks, with data sampled on rising edges only - no bus turnaround required. The internal PLL enables precise 2.5-cycle read latency timing when DOFF is high.

Each transaction delivers four sequential 36-bit words per access, achieving 900 MB/s bandwidth at 450 MHz. Echo clocks CQ and CQ align with output data edges to simplify capture in FPGA-based systems. Byte write selects BWS[3:0] allow granular 9-bit byte masking without disturbing adjacent data.

Key Specifications

Pinout & Package

Package: 165-ball fine-pitch ball grid array (FBGA), 15 mm × 17 mm × 1.4 mm body, RoHS-compliant, Pb-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar QDR II+ SRAM applications.

Compared with AS7C361624A-450BIN and IS42S32800J-45BLI, CY7C1665KV18-450BZXC provides guaranteed 2.5-cycle latency, integrated echo clocks, and QVLD - essential for FPGA-based systems requiring deterministic timing and minimal PCB routing complexity.

Availability

CY7C1665KV18-450BZXC is available at Aetrix Electronics and suitable for high-speed packet buffering, network switch lookup tables, baseband signal processing, and ATE pattern memory requiring stable component supply and long-term industrial availability.

Supply support for CY7C1665KV18-450BZXC 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 applications, with focus on signal integrity and timing precision.

CY7C1665KV18 belongs to the QDR II+ SRAM product line, engineered specifically for deterministic, low-latency, concurrent-access memory subsystems in high-speed communications infrastructure.

FAQ

What is the function of the DOFF pin on CY7C1665KV18-450BZXC?

The DOFF pin disables the internal PLL when pulled low. In this state, the device operates in QDR I mode with 1-cycle read latency and a maximum clock frequency of 167 MHz. When DOFF is high (default), the PLL enables 2.5-cycle latency operation at up to 450 MHz. Pull-up resistors ≤10 kΩ are recommended for normal use.

How does the ZQ pin affect output drive strength?

ZQ calibrates the output impedance of Q[35:0], CQ, and CQ pins to 0.2 × RQ, where RQ is an external resistor tied between ZQ and ground. This matches typical 50 Ω PCB traces. Connecting ZQ directly to VDDQ enables minimum impedance mode. ZQ must never be left floating or tied to ground.

Can CY7C1665KV18-450BZXC perform simultaneous read and write to the same address?

No. While read and write ports operate concurrently, the device guarantees data coherency by ensuring that a write to an address completes before a subsequent read returns the updated value. Internal arbitration prevents conflicting access - reads return the most recently written data, preserving consistency without external logic.

What is the role of BWS[3:0] in byte-write operations?

BWS[3:0] are active-low byte write enables controlling four independent 9-bit segments of the 36-bit data bus. BWS0 affects D[8:0], BWS1 affects D[17:9], BWS2 affects D[26:18], and BWS3 affects D[35:27]. Deasserting any BWS leaves its corresponding byte unchanged during the write burst.