Infineon Technologies CY7C1425KV18-250BZC

Overview

CY7C1425KV18 from Cypress Semiconductor is a 36-Mbit QDR® II SRAM with 4M × 9 organization, 333 MHz clock frequency (666 MHz DDR data rate), 1.8 V core supply, and 1.4–1.8 V I/O supply. It features separate read/write ports, two-word burst architecture, and echo clocks (CQ/CQ) for high-speed data capture in networking packet buffers and baseband processing.

For engineers reviewing the CY7C1425KV18 datasheet, CY7C1425KV18 pinout, CY7C1425KV18 application, or CY7C1425KV18 equivalent, key selection criteria include concurrent read/write bandwidth, DOFF-configurable 1.5-cycle vs. 1-cycle read latency, HSTL-18-compatible output drive, JTAG 1149.1 testability, and FBGA-165 package compatibility with high-density memory subsystems.

Technical Context

The CY7C1425KV18 implements a synchronous pipelined QDR II architecture with independent read and write ports sharing a multiplexed 21-bit address bus. All accesses are edge-triggered on K/K clocks, and data is latched on rising edges only-no internal phase shifting.

It uses a PLL to align echo clocks (CQ/CQ) with output clocks (C/C), enabling precise timing closure at 666 MHz DDR. Read latency is configurable via DOFF: 1.5 cycles (DOFF = HIGH) for maximum throughput or 1 cycle (DOFF = LOW) for QDR I compatibility.

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 IDT72T3615L10PA and IS61WV102418BLL-15BLI, the CY7C1425KV18 uniquely delivers 333 MHz operation with HSTL-18 outputs in a 165-ball FBGA - making it the only option among the three that supports 666 MT/s DDR in standard PCB layouts without differential routing.

Availability

CY7C1425KV18 is available at Aetrix Electronics and suitable for high-speed packet buffering, baseband signal processing, and network processor offload applications requiring stable component supply across multi-year production cycles.

Supply support for CY7C1425KV18 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 networking, automotive, and industrial systems.

The QDR II SRAM product line targets bandwidth-critical infrastructure applications - specifically engineered to replace legacy SRAMs in packet buffers, baseband memories, and protocol accelerators where concurrent access and deterministic timing are mandatory.

FAQ

What is the function of the DOFF pin on CY7C1425KV18?

The DOFF (Data Output OFFset) pin configures read latency mode: when asserted HIGH, it enables 1.5-cycle latency for maximum throughput in streaming applications; when LOW, it reverts to 1-cycle latency for QDR I compatibility and lower-latency control operations. This is a static configuration pin sampled at initialization and does not require dynamic toggling during operation.

Can CY7C1425KV18 operate with only one clock domain (K-only)?

Yes - the device supports single-clock-domain operation using only the K clock for both input capture and output timing. In this mode, C and C are tied to K and K respectively, and CQ/CQ track K/K. However, deskew capability is lost, and timing margins tighten significantly above 200 MHz; dual-clock mode is recommended for 333 MHz operation.

How many address lines does CY7C1425KV18 require?

The CY7C1425KV18 requires 21 address lines (A[20:0]) to access its full 4M × 9 memory space. These are multiplexed for both read and write ports and sampled on alternate rising edges of K (read) and K (write) clocks. No separate address buses are needed - simplifying PCB layout and reducing pin count versus asynchronous SRAMs.

Is ZQ calibration mandatory for reliable operation?

ZQ calibration is required to set output driver impedance for HSTL-18 compliance. The ZQ pin must be connected to a 240 Ω resistor to VSS for accurate 25 Ω or 50 Ω (programmable) output termination. Omitting ZQ results in undefined drive strength, increased signal reflection, and failure to meet setup/hold timing at 666 MT/s - especially on longer traces or multi-drop topologies.