Cypress Semiconductor Corp CY7C1165KV18-550BZC

Overview

CY7C1165KV18 from Cypress Semiconductor is a 512K × 36, 18-Mbit QDR® II+ SRAM with separate read/write ports, 550 MHz clock operation (1100 MT/s DDR), 2.5-cycle read latency, and HSTL I/O supporting 1.4–1.8 V VDDQ. It delivers high-bandwidth buffering for network packet processing in telecom line cards.

For engineers reviewing the CY7C1165KV18 datasheet, CY7C1165KV18 pinout, CY7C1165KV18 application, or CY7C1165KV18 equivalent, key selection criteria include burst depth (4-word), DOFF-controlled latency mode (QDR I vs. QDR II+), byte write select granularity (BWS0–BWS3), echo clock timing (CQ/CQ), and FBGA-165 package compatibility with high-speed PCB layout constraints.

Technical Context

The CY7C1165KV18 implements a synchronous pipelined QDR II+ architecture with independent read and write ports sharing a multiplexed 17-bit address bus. Read and write operations are initiated on rising edges of complementary K/K clocks, enabling concurrent access without bus turnaround.

It integrates an internal PLL for precise data placement and uses echo clocks (CQ/CQ) aligned to K/K to simplify high-speed data capture. The DOFF pin selects between 2.5-cycle QDR II+ mode (DOFF = HIGH) and 1-cycle QDR I mode (DOFF = LOW), with corresponding maximum frequency limits (550 MHz vs. 167 MHz).

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm body, 0.8 mm ball pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T36150 and IS61WV102436B, the CY7C1165KV18 uniquely offers configurable latency (via DOFF), integrated echo clocks for simplified capture, and guaranteed 550 MHz operation - making it optimal for next-generation telecom and test equipment demanding both flexibility and peak performance.

Availability

CY7C1165KV18 is available at Aetrix Electronics and suitable for network packet buffering, high-speed test equipment memory, telecom line card control plane, and real-time signal processing buffer applications requiring stable component supply across extended product lifecycles.

Supply support for CY7C1165KV18 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.

The QDR® II+ SRAM product line targets high-throughput, low-latency data buffering in infrastructure equipment where deterministic timing, concurrent access, and DDR bandwidth are essential - especially in packet-forwarding engines and instrumentation front-ends.

FAQ

What is the function of the DOFF pin on CY7C1165KV18?

The DOFF (PLL Turn Off) pin selects between two operational modes: when pulled HIGH, the device operates in QDR II+ mode with 2.5-cycle read latency and up to 550 MHz clock speed; when pulled LOW, the internal PLL is disabled and the device reverts to QDR I timing with 1-cycle latency and a maximum frequency of 167 MHz. This provides design flexibility for timing-critical vs. power-constrained use cases.

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

The ZQ pin connects to an external 240 Ω resistor to ground and calibrates the output driver impedance of Q[35:0], CQ, and CQ pins to approximately 50 Ω (0.2 × RQ). This matching minimizes reflections and improves eye diagram margins on controlled-impedance PCB traces, directly enhancing setup/hold timing margins at 1100 MT/s data rates.

Can CY7C1165KV18 perform partial writes without reading existing data first?

Yes. The device supports true byte-selectable writes using BWS[3:0] signals. Each BWS line controls a 9-bit byte lane (D[8:0], D[17:9], D[26:18], D[35:27]), allowing any subset of the 36-bit word to be updated independently. Unselected bytes retain their prior values, eliminating the need for read-modify-write sequences and reducing bus occupancy.

What role do CQ and CQ play in system timing closure?

CQ and CQ are free-running echo clocks synchronized to K and K, respectively, and edge-aligned with valid Q[35:0] data. They provide a dedicated, low-skew timing reference for external FPGA or ASIC receivers to capture output data, removing dependency on board-level clock-to-data skew compensation and simplifying timing analysis in >500 MHz systems.