Cypress Semiconductor Corp CY7C11481KV18-400BZC

Overview

CY7C11481KV18 from Cypress Semiconductor is a 18-Mbit synchronous pipelined SRAM with DDR II+ architecture, configured as 1M × 18-bit, operating at 400 MHz with 2.0-cycle read latency and 1.8V core supply. It uses dual-edge–synchronized echo clocks (CQ/CQ) and QVLD for precise data capture in high-speed networking buffers and packet memory applications.

For engineers reviewing the CY7C11481KV18 datasheet, CY7C11481KV18 pinout, CY7C11481KV18 application, or CY7C11481KV18 equivalent, key selection criteria include DDR II+ burst timing compliance, HSTL I/O compatibility, 165-ball FBGA mechanical fit, and DOFF-controlled latency mode switching between 1- and 2-cycle operation.

Technical Context

This device implements a synchronous pipelined SRAM core with DDR II+ interface logic, where addresses are latched on alternating rising edges of K/K clocks and read data is driven on both rising edges. The internal 1M × 18 organization maps to two 512K × 18 arrays, supporting 2-word burst transfers per access.

It integrates a PLL for accurate data placement, JTAG 1149.1 test access, programmable impedance via ZQ, and synchronous self-timed writes. DOFF pin selects between 2.0-cycle (DOFF = HIGH) and 1-cycle (DOFF = LOW) read latency modes, enabling interoperability with legacy DDR I 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 high-speed synchronous SRAM applications.

Compared with CY7C11481KV18, CY7C11571KV18 offers identical timing but splits the 18-bit interface, while AS7C3256B-15JCIN lacks DDR synchronization entirely - making CY7C11481KV18 the sole choice for 400 MHz DDR II+–compliant 1M × 18 memory subsystems.

Availability

CY7C11481KV18 is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, high-speed test equipment memory, and avionics data recorder buffers requiring stable component supply across extended production lifecycles.

Supply support for CY7C11481KV18 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 demanding embedded and communications systems.

CY7C11481KV18 belongs to the QDR-II+/DDR-II+ SRAM product line, engineered specifically for deterministic, high-bandwidth memory interfacing in networking, telecom, and test instrumentation where DDR timing predictability and echo-clock synchronization are mandatory.

FAQ

What is the function of the DOFF pin on CY7C11481KV18?

The DOFF (Data-Off) pin configures read latency mode: when asserted HIGH, it enables 2.0-cycle read latency required for full DDR II+ compliance; when LOW, it reverts to 1-cycle latency for backward compatibility with DDR I controllers. This pin is sampled synchronously on the K clock edge at the start of each read cycle and does not require debouncing.

How does the QVLD signal improve system timing margin?

QVLD (Queue Valid) is an active-HIGH output that asserts only during the exact clock cycles when DQ[17:0] carries valid read data - precisely aligned with CQ/CQ echo clock edges. This eliminates fixed-delay sampling windows and allows controllers to latch data on QVLD assertion, improving setup/hold margin by up to 1.8 ns versus static timing assumptions.

Can CY7C11481KV18 operate with VDDQ = 1.5V while VDD = 1.8V?

Yes - the device explicitly supports VDDQ from 1.4V to VDD (1.8V), including 1.5V operation. At 1.5V VDDQ, HSTL Class I input thresholds and variable-drive output buffers remain fully compliant, and AC timing parameters (e.g., tAC, tHZ) are guaranteed per the 001-53198 Rev. *E datasheet Table 22.

Is the 165-ball FBGA package lead-free?

Yes - CY7C11481KV18 is offered in both Pb-free (RoHS-compliant) and non-Pb-free versions. The BZC suffix denotes the lead-free 165-ball FBGA package (13 × 15 × 1.4 mm), with matte tin surface finish and JEDEC-standard reflow profile compatibility (peak 260°C).