Cypress Semiconductor Corp CY7C25632KV18-550BZXI

Overview

CY7C25632KV18 from Cypress Semiconductor is a 72-Mbit QDR® II+ SRAM with 4M × 18 organization, 550 MHz clock frequency, 2.5-cycle read latency, and on-die termination (ODT) supporting D[17:0], BWS[1:0], and K/K inputs. It features separate read/write ports, DDR interfaces on both ports (1100 MHz data rate), and operates at 1.8 V core / 1.4–1.8 V I/O for high-bandwidth networking buffer applications.

For engineers reviewing the CY7C25632KV18 datasheet, CY7C25632KV18 pinout, CY7C25632KV18 application, or CY7C25632KV18 equivalent, key selection criteria include burst depth (four-word), echo clock timing (CQ/CQ), QVLD validity signaling, and FBGA-165 package compatibility with high-speed PCB layout constraints.

Technical Context

The CY7C25632KV18 implements a synchronous pipelined architecture with independent read and write ports sharing a multiplexed 20-bit address bus. Address latching occurs on alternate rising edges of K and K clocks, enabling concurrent access without bus turnaround.

It uses a phase-locked loop (PLL) for precise data placement and supports dual-mode latency: 2.5 cycles when DOFF = HIGH (QDR II+ mode) or 1 cycle when DOFF = LOW (QDR I compatibility). Echo clocks CQ/CQ are free-running and edge-aligned with output data to simplify high-speed capture.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3615L10BG and IS61WV102418BLL-10BLI, the CY7C25632KV18 uniquely delivers 72-Mbit density with concurrent DDR ports, ODT, and echo clocks - making it irreplaceable in high-throughput packet buffering where deterministic timing and board-area savings are critical.

Availability

CY7C25632KV18 is available at Aetrix Electronics and suitable for high-speed network packet buffers, telecom line card memory, and baseband processing systems requiring stable component supply and long-term obsolescence management.

Supply support for CY7C25632KV18 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.

The QDR® II+ SRAM product line targets high-bandwidth, low-latency buffering in infrastructure equipment where deterministic timing, concurrent access, and signal integrity at multi-GHz rates are essential.

FAQ

What is the function of the DOFF pin on CY7C25632KV18?

The DOFF (Data-Off) pin selects the read latency mode: when asserted HIGH, the device operates in QDR II+ mode with 2.5-cycle read latency; when asserted LOW, it operates in QDR I mode with 1-cycle latency. This allows backward compatibility with legacy QDR I controllers while enabling higher bandwidth in new designs.

How does the ZQ pin affect output driver impedance?

The ZQ pin connects to an external precision resistor to ground, calibrating internal output drivers to 0.2 × RQ. For example, a 100 Ω ZQ resistor sets output impedance to 20 Ω. Direct connection to VDDQ enables minimum impedance mode; grounding or leaving ZQ floating is prohibited and may cause undefined behavior.

Can CY7C25632KV18 be used without external termination resistors?

Yes - its on-die termination (ODT) supports D[17:0], BWS[1:0], and K/K inputs. When enabled via the ODT pin and calibrated via ZQ, ODT replaces up to 22 external resistors, reducing PCB area, BOM cost, and routing complexity while maintaining signal integrity at 550 MHz.

What is the role of CQ and CQ echo clocks in system timing?

CQ and CQ are free-running, edge-aligned copies of K and K clocks, respectively. They provide source-synchronous timing references for capturing Q[17:0] output data, eliminating setup/hold uncertainty caused by clock-to-out skew. This enables reliable data sampling at 1100 MT/s without complex deskew circuitry.