Cypress Semiconductor Corp CY7C25632KV18-400BZC

Overview

CY7C25632KV18 from Cypress Semiconductor is a 72-Mbit QDR® II+ SRAM with 4M × 18 organization, 2.5-cycle read latency, 400 MHz maximum operating frequency, 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 (2.2 Gbps effective data rate), and operates at 1.8 V core / 1.4–1.8 V I/O supply - deployed in high-speed packet buffering for network switches and routers.

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, ODT configuration via ZQ/ODT pins, and FBGA-165 package compatibility with high-density PCB routing 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 alternating rising edges of K and K clocks, enabling concurrent access without bus turnaround.

It uses HSTL Class I inputs and variable-drive HSTL outputs, supports JTAG 1149.1 boundary scan, and integrates a PLL to align output data with echo clocks (CQ/CQ). The DOFF pin selects between 2.5-cycle (HIGH) and 1-cycle (LOW) read latency modes, preserving backward compatibility with QDR I systems.

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, Pb-free option available.

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 delivers 4× memory density, deterministic 2.5-cycle latency, and integrated ODT - making it uniquely suited for new designs requiring sustained 1.44 GB/s bidirectional bandwidth with minimal PCB routing overhead.

Availability

CY7C25632KV18 is available at Aetrix Electronics and suitable for network switching, high-speed test instrumentation, telecom baseband processing, and FPGA-based protocol acceleration requiring stable component supply across multi-year production cycles.

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) is a fabless semiconductor company specializing in high-performance memory, microcontrollers, and connectivity solutions for industrial, automotive, and communications markets.

The QDR® II+ SRAM product line was designed specifically for bandwidth-constrained, low-latency applications in networking infrastructure - delivering deterministic timing, concurrent access, and signal integrity features essential for 10G+ packet processing.

FAQ

What is the function of the DOFF pin on CY7C25632KV18?

The DOFF (Delay OFF) pin configures read latency mode: when asserted HIGH, it enables 2.5-cycle read latency for QDR II+ operation; when LOW, it reverts to 1-cycle latency compatible with QDR I timing. This pin is sampled at power-up and remains static during operation - no dynamic switching is supported.

How does on-die termination (ODT) work on CY7C25632KV18?

ODT provides programmable input termination for D[17:0], BWS[1:0], and K/K pins using an external ZQ resistor (175–350 Ω to ground). The ODT pin selects termination range: LOW selects RQ/3.33 (~53–105 Ω); HIGH selects RQ/1.66 (~105–210 Ω). Default is HIGH if left floating.

Can CY7C25632KV18 operate with only one clock input?

No. The device requires both K and K differential clock inputs for proper DDR timing - K controls write-side sampling and K controls read-side sampling. Both clocks must be present and phase-aligned; omitting either disables functional operation per the AC timing specifications.

What is the purpose of the QVLD signal?

QVLD (Queue Valid) is an output that asserts synchronously with the first valid word of the four-word burst on Q[17:0]. It is edge-aligned with CQ and CQ, providing unambiguous timing reference for capturing burst data in receiving logic - eliminating need for fixed delay calibration in high-speed receivers.