Infineon Technologies CY7C25652KV18-500BZXI

Overview

CY7C25652KV18 from Cypress Semiconductor is a 72-Mbit QDR® II+ SRAM with 2M × 36 organization, 2.5-cycle read latency, and on-die termination (ODT). It operates at 500 MHz (2.5 ns clock period), supports DDR interfaces on independent read/write ports, and delivers 1100 MT/s data transfer rate. Used in high-bandwidth packet buffering for network switches and routers.

For engineers reviewing the CY7C25652KV18 datasheet, CY7C25652KV18 pinout, CY7C25652KV18 application, or CY7C25652KV18 equivalent, key selection criteria include burst depth (four-word), ODT support on D[35:0]/BWS[3:0]/K/K inputs, echo clock (CQ/CQ) timing alignment, and 165-ball FBGA package compatibility with high-speed PCB routing constraints.

Technical Context

The CY7C25652KV18 implements a synchronous pipelined architecture with physically separate read and write data paths, eliminating bus turnaround overhead. Its four-word burst mode reduces address bus frequency by 4× while maintaining full bandwidth, and the PLL ensures precise data placement relative to echo clocks CQ/CQ.

It uses dual input clocks (K and K) - both rising edges drive DDR transfers - and supports programmable ODT ranges via ZQ resistor tuning and ODT pin logic level. The device latches read/write addresses on alternating K edges and guarantees full data coherency across concurrent transactions.

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 IS61WV102432BLL-10BLI, the CY7C25652KV18 uniquely balances 500 MHz DDR bandwidth, on-die termination, and deterministic echo-clock timing - making it optimal for new high-speed networking and test equipment designs requiring robust signal integrity and low-latency concurrency.

Availability

CY7C25652KV18 is available at Aetrix Electronics and suitable for network packet buffering, high-speed test equipment memory, baseband processing in 5G radio units, and FPGA co-processing cache requiring stable component supply and long-term lifecycle assurance.

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.

The QDR® II+ SRAM product line was designed specifically for ultra-low-latency, high-bandwidth applications in networking infrastructure and test instrumentation where deterministic timing and concurrent access are mandatory.

FAQ

What is the function of the DOFF pin on CY7C25652KV18?

The DOFF (Data Output OFF) pin selects read latency mode: when asserted HIGH, the device operates with 2.5-cycle read latency; when LOW, it reverts to 1-cycle latency like QDR I. This pin is sampled at power-up and determines internal pipeline configuration - it cannot be changed dynamically during operation.

How does the ZQ pin calibrate output impedance?

The ZQ pin connects to an external precision resistor (typically 240 Ω) to ground. During power-up initialization, the device measures this resistance and configures its output drivers to deliver 0.2 × RQ impedance (e.g., 48 Ω for 240 Ω ZQ). Direct connection to VDDQ enables minimum impedance mode; grounding or leaving unconnected is prohibited.

Can CY7C25652KV18 be used with a single-ended clock source?

No - the device requires true differential K/K clock inputs. Both signals must toggle with defined voltage thresholds and timing skew < 50 ps. Using a single-ended source with passive inversion violates AC timing specifications and risks metastability in internal clock domain crossing logic.

What happens to Q[35:0] when RPS is deasserted?

When RPS is deasserted (HIGH), the read port is deselected and Q[35:0] drivers enter high-impedance (tri-state) mode on the next rising edge of K. Pending read bursts complete before tri-state activation, ensuring no partial data corruption. QVLD goes LOW simultaneously with output disable.