Infineon Technologies CY7C25652KV18-450BZI

Overview

CY7C25652KV18 from Cypress Semiconductor is a 72-Mbit QDR® II+ SRAM with 2M × 36 organization, 450 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 rates on independent read/write ports and operates at 1.8 V core / 1.4–1.8 V I/O for high-bandwidth packet buffering in network line cards.

For engineers reviewing the CY7C25652KV18 datasheet, CY7C25652KV18 pinout, CY7C25652KV18 application, or CY7C25652KV18 equivalent, key selection criteria include burst depth (four-word), echo clock timing (CQ/CQ), QVLD validity signaling, ODT configuration via ZQ/ODT pins, and FBGA-165 package compatibility with high-speed PCB routing constraints.

Technical Context

The CY7C25652KV18 implements a synchronous pipelined QDR II+ architecture with physically separate read and write data paths, eliminating bus turnaround delays. It uses dual input clocks (K and K) - both rising-edge-triggered - to latch addresses and data, enabling concurrent read/write operations without arbitration overhead.

Its internal PLL ensures precise data placement relative to echo clocks (CQ/CQ), while the DOFF pin selects between 2.5-cycle (DOFF = HIGH) and 1-cycle (DOFF = LOW) read latency modes. On-die termination is configurable via ZQ resistor and ODT pin for D[35:0], BWS[3:0], and K/K inputs, reducing external termination components.

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 IDT72T36120L10BG and IS61WV102436B, CY7C25652KV18 uniquely combines 72-Mbit density, 450 MHz QDR II+ timing, integrated ODT, and 1.4–1.8 V flexible I/O - making it the only drop-in solution for new 10G+ networking and ATE platforms requiring deterministic latency and minimal board area.

Availability

CY7C25652KV18 is available at Aetrix Electronics and suitable for network packet buffering, high-speed test equipment memory, telecom baseband processing, and defense radar signal buffering requiring stable component supply across extended temperature ranges and long production lifecycles.

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

CY7C25652KV18 belongs to Cypress's QDR II+ SRAM product line, engineered specifically for deterministic, high-throughput buffering in infrastructure equipment where concurrent access, low latency, and signal integrity at multi-GHz speeds are mandatory.

FAQ

What is the function of the DOFF pin on CY7C25652KV18?

The DOFF (Data-Off) pin configures read latency mode: when asserted HIGH, it enables 2.5-cycle read latency required for full 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 latched internally - it cannot be changed dynamically during operation without reset.

How does on-die termination (ODT) work with the ZQ pin?

ZQ connects to an external precision resistor (175–350 Ω) to ground, setting output driver impedance to 0.2×RQ for Q[35:0], CQ, and CQ. The ODT pin selects termination range: LOW enables RQ/3.33 (175–350 Ω), HIGH enables RQ/1.66 (175–250 Ω). Floating ODT defaults to HIGH range - no external pull-up/down is required.

Can CY7C25652KV18 operate with only one clock input?

No. The device requires both K and K clock inputs - they are complementary and both rising edges are used for data capture and output timing. Using only K violates AC timing specifications and causes undefined behavior on write data sampling and read data alignment. K must be inverted from K with <100 ps skew for guaranteed operation at 450 MHz.

What is the purpose of the QVLD signal and how is it timed?

QVLD (Queue Valid) is an output that pulses HIGH for exactly one K/K cycle when valid data appears on Q[35:0] during a read burst. It is edge-aligned with CQ and CQ, providing unambiguous indication of data validity without requiring additional timing margin calculations - essential for reliable capture in FPGA-based receivers.