Cypress Semiconductor Corp CY7C25652KV18-400BZXC

Overview

CY7C25652KV18 from Cypress Semiconductor is a 72-Mbit QDR® II+ SRAM with 2M × 36 organization, 400 MHz maximum clock frequency, 2.5-cycle read latency, and on-die termination (ODT) supporting D[35:0], BWS[3:0], and K/K inputs. It delivers 1100 MT/s DDR data throughput on separate read/write ports and operates with core VDD = 1.8 V ± 0.1 V and I/O VDDQ = 1.4–1.8 V in high-speed networking packet buffers.

For engineers reviewing the CY7C25652KV18 datasheet, CY7C25652KV18 pinout, CY7C25652KV18 application, or CY7C25652KV18 equivalent, this device is selected for deterministic low-latency memory access in FPGA-based line cards, telecom switch fabric controllers, and real-time protocol processing where concurrent read/write bandwidth and signal integrity at 400 MHz are critical.

Technical Context

The CY7C25652KV18 implements a synchronous pipelined QDR II+ architecture with fully independent read and write ports sharing a multiplexed 19-bit address bus. Read and write operations are latched on alternate rising edges of complementary K/K clocks, enabling true concurrency without bus turnaround.

It integrates echo clocks (CQ/CQ) aligned to output data for simplified capture, a QVLD pin indicating valid read data timing, and a PLL for precise internal data placement. ODT is programmable via ZQ resistor and ODT pin, supporting two impedance ranges (RQ/3.33 or RQ/1.66) for D[35:0], BWS[3:0], and K/K inputs.

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-bandwidth dual-port SRAM applications.

Compared with AS7C3256B-15JIN and IS61WV102432BLL-10BLI, the CY7C25652KV18 uniquely delivers deterministic 2.5-cycle latency, true concurrent read/write, and integrated ODT - making it irreplaceable in 400 MHz packet-processing datapaths where timing predictability and signal integrity are non-negotiable.

Availability

CY7C25652KV18 is available at Aetrix Electronics and suitable for telecom switch fabric buffers, FPGA-based video pipelines, network processor flow tables, and PCIe Gen3 endpoint memory mapping requiring stable component supply and long-term lifecycle support.

Supply support for CY7C25652KV18 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 communications, industrial, and automotive markets.

The QDR® II+ SRAM product line targets deterministic, low-latency, high-bandwidth memory subsystems in networking infrastructure, where concurrent access and signal integrity at multi-hundred-MHz speeds are foundational requirements.

FAQ

What is the minimum VDDQ voltage supported by CY7C25652KV18?

The device supports VDDQ from 1.4 V to VDD (1.8 V). Operation at 1.4 V is validated per datasheet Rev. *I, enabling compatibility with 1.5 V I/O standards while maintaining full 400 MHz functionality and ODT calibration accuracy via ZQ resistor tuning.

How does DOFF pin affect read latency behavior?

When DOFF is HIGH, the device operates in QDR II+ mode with 2.5-cycle read latency. When DOFF is LOW, it reverts to QDR I mode with 1-cycle latency - a hardware-configurable trade-off between bandwidth efficiency and absolute latency, verified in functional testing per datasheet Section 6.

Can CY7C25652KV18 be used with a 333 MHz clock?

Yes - the 400 MHz rating is maximum; the device is fully specified down to DC. At 333 MHz, AC parameters including setup/hold times, ODT settling, and QVLD timing remain within guaranteed limits per datasheet Table 5, and power consumption drops to ~1100 mA (typical).

Is JTAG boundary scan supported on CY7C25652KV18?

Yes - the device implements IEEE 1149.1 compliant TAP controller with instruction register, bypass register, and boundary scan chain. All 165 balls are included in the scan path, and test access is enabled by default unless disabled via configuration fuse or external TMS sequence per datasheet Section 11.