Cypress Semiconductor Corp CY7C25632KV18-500BZXI

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) for D[17:0], BWS[1:0], and K/K inputs. It features separate read/write ports, DDR interfaces on both ports (1100 MT/s effective data rate), and operates at core VDD = 1.8 V ± 0.1 V with I/O VDDQ = 1.4–1.8 V. Used in high-speed networking line cards for packet buffering and header lookup.

For engineers reviewing the CY7C25632KV18 datasheet, CY7C25632KV18 pinout, CY7C25632KV18 application, or CY7C25632KV18 equivalent, key selection criteria include burst depth (four-word), echo clock support (CQ/CQ), QVLD timing alignment, HSTL-compatible I/O drive, and FBGA-165 package compatibility with high-density PCB routing constraints.

Technical Context

The CY7C25632KV18 implements a synchronous pipelined QDR II+ 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 integrates a PLL for precise data placement, supports DOFF-driven latency selection (2.5-cycle when HIGH, 1-cycle when LOW), and uses echo clocks CQ/CQ to simplify high-speed data capture. ODT is configurable via ZQ resistor and ODT pin for input termination matching across D[17:0], BWS[1:0], and K/K.

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-speed burst SRAM applications.

Compared with IDT72T3615L10BG and IS61WV102418BLL-10BLI, the CY7C25632KV18 delivers higher bandwidth (1100 vs. 1000 MT/s), built-in ODT for cleaner signal integrity, and programmable latency-making it optimal for new high-speed data-path designs requiring deterministic timing and minimal board-level components.

Availability

CY7C25632KV18 is available at Aetrix Electronics and suitable for high-speed networking switches, telecom line cards, FPGA accelerator caching, and automated test equipment requiring stable component supply and long-term lifecycle support.

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 demanding embedded and communications systems.

The QDR® II+ SRAM product line targets applications requiring ultra-low latency, concurrent read/write access, and DDR bandwidth - specifically optimized for network infrastructure, test equipment, and high-end digital signal processing.

FAQ

What is the function of the DOFF pin on CY7C25632KV18?

The DOFF (Delay OFF) pin selects read latency mode: when asserted HIGH, it enables 2.5-cycle read latency; when LOW, it reverts to 1-cycle latency like QDR I. This allows runtime optimization between bandwidth and latency depending on system timing margins and application requirements.

How does the ZQ pin calibrate output impedance?

The ZQ pin connects to an external precision resistor (typically 240 Ω) to ground. During power-up initialization, the device measures this resistance and configures its output drivers and ODT circuits to 0.2 × RQ (e.g., ~48 Ω), ensuring matched impedance to the PCB trace for minimal signal reflection at 550 MHz.

Can CY7C25632KV18 operate with only one clock input?

No - the device requires both K and K differential clock inputs. All synchronous operations (address/data capture, output timing) depend on rising edges of both clocks. Using only one clock violates timing specifications and prevents correct DDR operation and echo clock generation.

What is the role of QVLD relative to CQ and CQ?

QVLD is edge-aligned with CQ and CQ echo clocks and asserts exactly when Q[17:0] data is valid and stable. It provides a dedicated, low-skew timing reference for receivers (e.g., FPGA input registers) to sample output data reliably, eliminating need for complex deskew logic in high-speed interfaces.