Infineon Technologies CY7C1425KV18-250BZXI

Overview

CY7C1425KV18 from Cypress Semiconductor is a 4M × 9 (36-Mbit), 1.8 V QDR® II SRAM with separate read/write ports, 333 MHz clock operation (666 MHz DDR data rate), 1.5-cycle read latency (DOFF = HIGH), and 165-ball FBGA (13 × 15 × 1.4 mm) packaging. It delivers concurrent burst reads/writes for high-bandwidth networking buffers in packet switching ASICs.

For engineers reviewing the CY7C1425KV18 datasheet, CY7C1425KV18 pinout, CY7C1425KV18 application, or CY7C1425KV18 equivalent, key selection criteria include dual-clock DDR timing, echo clock support (CQ/CQ), HSTL-18 I/O compatibility, and synchronous self-timed write architecture.

Technical Context

The CY7C1425KV18 implements a true two-port QDR II architecture: independent K/K clocks latch address and data on rising edges for write operations, while C/C clocks control output timing with echo clocks (CQ/CQ) aligned to output data edges. This eliminates bus turnaround and enables full-duplex memory access.

It uses a pipelined synchronous design with internal address multiplexing (21-bit A[20:0]), DOFF-selectable read latency (1.5-cycle or 1-cycle), and programmable byte write selects (BWS0 only). Core VDD = 1.8 V ±0.1 V; I/O VDDQ supports 1.4–1.8 V, enabling interoperability with both 1.5 V and 1.8 V systems.

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 QDR II SRAM applications.

Compared with IDT72T3615L10PA and IS61WV102418BLL-150BLI, the CY7C1425KV18 uniquely supports 333 MHz operation with configurable latency, echo clocks for skew-insensitive capture, and ZQ-calibrated HSTL outputs - making it the only option for new 10G+ switch fabric designs requiring guaranteed timing closure.

Availability

CY7C1425KV18 is available at Aetrix Electronics and suitable for packet switching buffers, network processor descriptor tables, and telecom baseband interleaving requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

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) 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-throughput buffering in networking and telecom infrastructure - prioritizing deterministic timing, concurrent access, and signal integrity at multi-GHz data rates.

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 read latency, which provides additional timing margin for reliable operation at 333 MHz. When LOW, it selects 1-cycle latency for lower-frequency applications. This setting directly affects the C/C clock-to-Q[8:0] output delay and must be set before initialization.

Can CY7C1425KV18 operate with only a single clock domain (K only)?

Yes - the device supports single-clock mode where K serves as both address/data capture and output clock. In this mode, C/C are unused, and CQ/CQ are generated relative to K. However, dual-clock mode (K/K + C/C) is required to achieve full 333 MHz performance with echo clock benefits; single-clock mode limits maximum frequency and forfeits skew compensation.

How does the ZQ pin function during system operation?

ZQ connects to a 240 Ω ±1% external resistor to ground and enables on-die impedance calibration of HSTL output drivers. Calibration occurs automatically at power-up and can be retriggered via JTAG. Proper ZQ termination ensures output driver impedance matches PCB trace impedance (typically 50 Ω), minimizing signal reflections and maintaining signal integrity at 666 MT/s.

Is CY7C1425KV18 pin-compatible with other devices in the CY7C14xxKV18 family?

No - although all share the same 165-ball FBGA package, pin assignments differ significantly across CY7C1425KV18 (×9), CY7C1412KV18 (×18), and CY7C1414KV18 (×36) due to differing data bus widths, byte write select counts (BWS0 only vs. BWS[3:0]), and address bit requirements (A[20:0] vs. A[19:0]/A[18:0]). Board layout is not interchangeable.