Cypress Semiconductor Corp CY7C25632KV18-450BZC

Overview

CY7C25632KV18 from Cypress Semiconductor is a 72-Mbit QDR® II+ SRAM with 4M × 18 organization, 450 MHz maximum 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 effective data rate), and HSTL I/O with VDDQ = 1.4–1.8 V 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, DOFF-configurable latency mode, and 165-ball FBGA 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 alternate rising edges of K and K clocks, enabling concurrent access without bus turnaround.

It integrates a PLL for precise data placement, supports programmable ODT via ZQ resistor calibration, and uses edge-aligned QVLD to indicate valid output data synchronized to CQ/CQ - critical for reliable capture in 550 MHz clock domain systems.

Key Specifications

Pinout & Package

Available in 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm body, RoHS-compliant, with 0.8 mm ball pitch and bottom-side thermal pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar QDR II+ SRAM applications.

Compared with IDT72T3615L10BG and IS61WV102418BLL-15BLI, CY7C25632KV18 uniquely delivers 72-Mbit density with integrated ODT, echo clocks, and 2.5-cycle latency - reducing BOM count by 36 resistors and enabling clean 450 MHz timing closure without external clock forwarding.

Availability

CY7C25632KV18 is available at Aetrix Electronics and suitable for high-speed network switch buffers, telecom line card packet memory, PCIe Gen3 endpoint caches, and ATE pattern memory requiring stable component supply and long-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) is a fabless semiconductor company specializing in high-performance memory, microcontrollers, and connectivity solutions for industrial, automotive, and communications markets.

This device belongs to Cypress's QDR® II+ SRAM product line, engineered specifically for deterministic, high-bandwidth buffering in packet-switched infrastructure where concurrent read/write throughput and sub-nanosecond timing predictability are mandatory.

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 latency for QDR II+ operation; when LOW, it reverts to 1-cycle latency compatible with legacy QDR I timing. This pin is sampled at power-up and remains static during operation - it is not a dynamic mode-switching control.

How does the ZQ pin calibrate output impedance?

ZQ connects to an external precision resistor (175–350 Ω) tied to ground. The internal circuitry measures this resistance and sets output driver impedance to exactly 0.2×RQ for Q[17:0], CQ, and CQ pins. Direct connection to VDDQ enables minimum impedance mode; floating or grounding ZQ is prohibited and may cause undefined behavior.

Can CY7C25632KV18 operate with only one clock input?

No. The device requires both K and K differential clock inputs. K controls read-port timing (address latching, Q[17:0] output), while K controls write-port timing (D[17:0] sampling, BWS[1:0] capture). Using only one clock violates timing specifications and prevents simultaneous read/write operation - the core architectural advantage of QDR II+.

What happens to Q[17:0] when RPS is deasserted?

When RPS is deasserted (HIGH), the read port is deselected and Q[17:0] drivers enter high-impedance (tri-state) mode on the next rising edge of the K clock. Pending read bursts complete before tri-state activation, ensuring no partial-word corruption. This behavior is synchronous and fully compliant with JTAG boundary-scan visibility requirements.