Cypress Semiconductor Corp CY7C25632KV18-550BZC

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 HSTL I/O with VDDQ = 1.4–1.8 V. Used in high-bandwidth packet buffering for network switches and routers.

For engineers reviewing the CY7C25632KV18 datasheet, CY7C25632KV18 pinout, CY7C25632KV18 application, or CY7C25632KV18 equivalent, key selection criteria include concurrent read/write capability, echo clock (CQ/CQ) timing support, QVLD data validity signaling, and FBGA-165 package compatibility with high-speed PCB routing constraints.

Technical Context

The device 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 full concurrency without bus turnaround. Internal self-timed writes ensure deterministic write completion independent of system timing margins.

It integrates a 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 (HIGH) and 1-cycle (LOW) read latency modes, allowing runtime adaptation to system timing budgets while maintaining full data coherency.

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 Pb-free option available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3615L10BG and IS61WV102418BLL-10BLI, CY7C25632KV18 delivers 4× higher density and integrated ODT/echo clocks - reducing BOM count by ≥12 components and enabling direct replacement in QDR-II+ socket designs without layout revision.

Availability

CY7C25632KV18 is available at Aetrix Electronics and suitable for network switch buffering, telecom baseband processing, high-frequency trading systems, and router line card memory requiring stable component supply across extended product lifecycles.

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.

CY7C25632KV18 belongs to Cypress's QDR® II+ SRAM product line, engineered specifically for deterministic, low-latency, high-bandwidth memory subsystems in networking infrastructure equipment operating at OC-192/STM-64 and beyond.

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 maximum bandwidth; when LOW, it reverts to 1-cycle latency like legacy QDR-I devices. This pin is sampled at power-up and remains static during operation - it is not dynamically switchable mid-operation per the datasheet timing diagrams.

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

ODT applies programmable termination resistance to D[17:0], BWS[1:0], and K/K inputs using an external ZQ resistor tied to ground. ODT pin state at power-up selects either RQ/3.33 (LOW) or RQ/1.66 (HIGH) termination value. Default high-state selection enables ~50 Ω termination when ZQ = 82.5 Ω, matching standard HSTL-1 transmission lines.

Can CY7C25632KV18 be used with a single-ended clock source?

No - the device requires differential K/K clock inputs. Driving K with a clock signal and tying K to a fixed voltage violates AC timing specifications and disables proper DDR operation. A dedicated differential clock generator or transformer is mandatory to meet tSKP (clock skew) and tCKH/tCKL (pulse width) requirements per Rev. *I datasheet Section "AC Electrical Characteristics".

What is the role of the QVLD signal in system timing design?

QVLD is a synchronous output that asserts coincident with valid Q[17:0] data on the rising edge of CQ/CQ. It replaces fixed-delay timing assumptions - designers use QVLD as a latch-enable signal for downstream registers, eliminating setup/hold margin allocation and enabling robust timing closure at 550 MHz without iterative PCB tuning.