Infineon Technologies CY7C1424AV18-250BZCT

Overview

CY7C1424AV18 from Cypress Semiconductor is a 36-Mbit (1M × 36) synchronous pipelined SRAM with DDR-II Separate I/O architecture, operating at 250 MHz clock frequency (500 MT/s effective data rate), supporting 2-word burst reads/writes, and featuring dual input clocks (K/K) and dual output clocks (C/C) for precise DDR timing alignment. It serves as high-bandwidth buffer memory in network packet processors and FPGA-based data-path acceleration systems.

For engineers reviewing the CY7C1424AV18 datasheet, CY7C1424AV18 pinout, CY7C1424AV18 application, or CY7C1424AV18 equivalent, key selection criteria include its 1M × 36 organization, 165-ball FBGA package, HSTL I/O compatibility, DLL-assisted data placement, and support for independent read/write ports with echo clocks (CQ/CQ) to simplify high-speed system-level data capture.

Technical Context

This SRAM implements a true separate I/O DDR-II interface: read and write ports share the address bus but use dedicated D[35:0] inputs and Q[35:0] outputs, eliminating bus turnaround delay. Internal pipelining enables one access per clock cycle with 2-word burst transfer per transaction.

Timing is governed by four critical clock domains: K/K for address/control/data input registration, C/C for output data edge alignment, and CQ/CQ echo clocks synchronized to C/C for receiver-side deskewing. The integrated Delay Lock Loop (DLL) ensures ±50 ps data-to-clock alignment under process/voltage/temperature variation.

Key Specifications

Pinout & Package

165-ball FBGA (15 × 17 × 1.4 mm, 0.8 mm pitch) with HSTL-compatible ball assignments. Pin functions validated per Cypress Document #38-05617 Rev. *D, Page 5–6.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed synchronous SRAM applications.

Compared with IS61WV102436BLL-15BLI and 21SPS136-200BG, CY7C1424AV18 delivers 25% higher bandwidth and eliminates system-level timing closure effort via CQ/CQ echo clocks-critical for 10G+ data-path synchronization where deterministic latency matters more than unit cost.

Availability

CY7C1424AV18 is available at Aetrix Electronics and suitable for network packet buffering, FPGA-based data acceleration, telecom baseband processing, and high-speed test equipment requiring stable component supply across extended production lifecycles.

Supply support for CY7C1424AV18 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.

CY7C1424AV18 belongs to the DDR-II SIO SRAM product line, designed specifically for high-bandwidth, low-latency buffering in systems demanding deterministic DDR timing, echo-clock–assisted data capture, and seamless integration with FPGA/DSP memory controllers.

FAQ

What is the minimum supported clock frequency for CY7C1424AV18?

The device operates down to DC (0 Hz) for static operation, but functional burst access requires a minimum K clock frequency of 10 MHz to meet internal timing margins for DLL lock and register setup/hold. Below this, data validity cannot be guaranteed per specification.

Can CY7C1424AV18 operate in single-clock mode without C and C inputs?

Yes. When C and C are tied to K and K respectively, the device enters single-clock mode: Q[35:0] outputs are timed to K/K edges, and CQ/CQ echo clocks track K/K instead of C/C. All timing parameters shift accordingly, with t_AC increasing by 1.2 ns versus dual-clock mode.

How is output impedance calibrated using the ZQ pin?

ZQ must be connected to a 240 Ω resistor to ground to calibrate Q[35:0], CQ, and CQ output drivers to 50 Ω. If tied directly to V_DDQ, drivers enter minimum-impedance mode (~30 Ω). ZQ must never float or connect to GND-doing so disables calibration and causes signal integrity failure.

Does CY7C1424AV18 support partial writes across all 36 bits?

Yes, via BWS[3:0] signals. Each BWS bit controls an 8-bit byte lane: BWS0 → D[7:0], BWS1 → D[15:8], BWS2 → D[23:16], BWS3 → D[35:24]. Asserting any BWS LOW masks that byte during write; unmasked bytes update, masked bytes retain prior values.