Infineon Technologies CY7C1426KV18-250BZC

Overview

CY7C1426KV18-250BZC from Cypress Semiconductor is a 4 M × 9 (36-Mbit) QDR® II SRAM with four-word burst architecture, 250 MHz maximum operating frequency, 1.8 V core supply, and 1.4–1.8 V I/O supply. It features separate read/write ports, DDR interfaces on both ports (500 Mbps per pin), echo clocks (CQ/CQ), and PLL-based timing control for high-bandwidth networking buffer applications.

For engineers reviewing the CY7C1426KV18-250BZC datasheet, CY7C1426KV18-250BZC pinout, CY7C1426KV18-250BZC application, or CY7C1426KV18-250BZC equivalent, key selection criteria include 9-bit data width, 20-bit address bus support, DOFF-controlled read latency (1 or 1.5 cycles), HSTL-compatible output drive, and 165-ball FBGA (13 × 15 × 1.4 mm) package compatibility with high-speed PCB layout constraints.

Technical Context

The CY7C1426KV18-250BZC implements a synchronous pipelined QDR II architecture with independent read and write ports sharing a multiplexed 20-bit address bus. Read and write operations are latched on alternate rising edges of the K clock, enabling concurrent access without bus turnaround.

It uses dual input clocks (K/K for addressing/control, C/C for output timing) plus echo clocks (CQ/CQ) to align data capture at the receiver. The internal PLL ensures precise data placement relative to echo clocks, supporting reliable 500 Mbps DDR transfers under 250 MHz clock conditions.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm body height, 0.8 mm ball pitch, RoHS-compliant Pb-free finish (BZC suffix).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-bandwidth dual-port SRAM applications.

Compared with AS7C362000B-250BIN, CY7C1426KV18-250BZC offers identical timing and pinout but lacks QDR II+ enhancements like reduced setup/hold windows; compared with IS42S32800J-25BLI, it delivers deterministic latency and true concurrency at the cost of higher power and design complexity.

Availability

CY7C1426KV18-250BZC is available at Aetrix Electronics and suitable for network packet buffering, high-speed test instrumentation, telecom line card design, and real-time video processing requiring stable component supply across long product lifecycles.

Supply support for CY7C1426KV18-250BZC 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 high-bandwidth, low-latency buffer applications in networking equipment and test systems where deterministic timing and concurrent access are critical.

FAQ

What is the function of the DOFF pin on CY7C1426KV18-250BZC?

The DOFF (Data Output OFFset) pin configures read latency: when held LOW, the device operates with 1-cycle read latency; when HIGH, it uses 1.5-cycle latency. This setting is sampled at power-up and remains static during operation. It affects internal pipeline depth and must match system timing budget-no dynamic switching is supported.

Can CY7C1426KV18-250BZC operate with only one clock (K) instead of dual K/K inputs?

Yes-the device supports single-clock mode where K and K are tied together. In this configuration, C and C must also be tied, and echo clocks CQ/CQ remain functional. All synchronous inputs are latched on the rising edge of the single K clock, simplifying clock distribution at the cost of reduced timing margin versus true differential K/K operation.

How does the ZQ pin affect signal integrity in high-speed layouts?

The ZQ pin connects to an external 240 Ω resistor to ground and calibrates the output driver impedance of all Q[8:0] pins to match transmission line characteristics. Proper ZQ calibration ensures consistent HSTL Class I output swing and edge rates, minimizing reflections and crosstalk on 500 Mbps DDR traces-critical for maintaining eye opening in dense PCB routing.

Is JTAG boundary scan supported on CY7C1426KV18-250BZC, and what functions does it enable?

Yes-CY7C1426KV18-250BZC implements IEEE 1149.1 JTAG with TCK, TMS, TDI, and TDO pins. It supports device identification, boundary scan testing of interconnects, and basic register access. JTAG is enabled by default at power-up and does not require external configuration; it is fully functional in all operating modes including during active memory access.