Infineon Technologies CY7C15632KV18-450BZXI

Overview

CY7C15632KV18-450BZXI from Infineon Technologies (formerly Cypress) is a 72-Mbit QDR® II+ SRAM with four-word burst architecture, 2.5-cycle read latency, and dual DDR interfaces operating at 450 MHz (900 MT/s). It features separate read/write ports, HSTL I/O, 1.8 V core / 1.4–1.8 V I/O supply, and is packaged in a 165-ball FBGA (13 × 15 × 1.4 mm). It serves as high-bandwidth buffer memory in network packet processors and FPGA-based data-path acceleration.

For engineers reviewing the CY7C15632KV18-450BZXI datasheet, CY7C15632KV18-450BZXI pinout, CY7C15632KV18-450BZXI application, or CY7C15632KV18-450BZXI equivalent, key selection criteria include its 450 MHz clock rating, QDR II+ 2.5-cycle latency mode, echo clock (CQ/CQ) timing support, DOFF-controlled PLL enable/disable, and depth expansion via RPS/WPS port selects.

Technical Context

The device implements a synchronous pipelined architecture with independent read and write ports sharing a multiplexed 20-bit address bus. All inputs (address, data, control) are registered on rising edges of complementary K/K clocks, and all outputs (Q[17:0], CQ, CQ) are edge-aligned to those clocks. The internal PLL enables precise 2.5-cycle read latency when DOFF = HIGH; disabling the PLL via DOFF = LOW reverts operation to QDR I mode (1-cycle latency, ≤167 MHz).

It supports concurrent read/write transactions without bus turnaround, using four-word bursts per access. Data coherency is maintained through synchronous self-timed writes and full output register staging. Echo clocks CQ and CQ provide source-synchronous timing for reliable high-speed data capture at system level.

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 Pb-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C15632KV18-450BZXI, the -500BZXI variant delivers 11% higher bandwidth but demands stricter layout and power design; the AS7C3256A offers lower cost and simpler interface but lacks concurrent access, burst efficiency, and source-synchronous timing - making it unsuitable for modern data-path acceleration.

Availability

CY7C15632KV18-450BZXI is available at Aetrix Electronics and suitable for network infrastructure, FPGA acceleration, telecom baseband, and high-speed test equipment requiring stable component supply and long-term industrial availability.

Supply support for CY7C15632KV18-450BZXI 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

Infineon Technologies acquired Cypress Semiconductor in 2020 and now owns and supports the full QDR SRAM portfolio, including legacy Cypress-developed devices like the CY7C15632KV18 series.

This part belongs to Infineon's high-performance synchronous SRAM product line, engineered specifically for deterministic, low-latency, full-duplex memory access in networking, communications, and real-time signal processing systems.

FAQ

What is the function of the DOFF pin?

The DOFF (PLL Turn Off) pin controls internal PLL operation: when pulled HIGH, the PLL is enabled for QDR II+ 2.5-cycle latency mode; when pulled LOW, the PLL is disabled and the device operates in QDR I mode with 1-cycle latency and reduced maximum frequency (≤167 MHz). This allows runtime mode switching or fallback to legacy timing behavior without changing firmware.

How does the ZQ pin affect signal integrity?

The ZQ pin enables on-die output impedance calibration: connecting it to a 240 Ω resistor to ground tunes CQ, CQ, and Q[17:0] driver strength to match 50 Ω transmission lines. This minimizes reflections and improves eye diagram margin at 450 MHz. Leaving ZQ unconnected or tied to GND violates specifications and causes unpredictable drive strength.

Can CY7C15632KV18-450BZXI be used with a single-ended clock source?

No - the device requires true differential K/K clock inputs. Driving K with a clock signal and tying K to a fixed voltage violates AC timing specifications and prevents proper DDR operation. A dedicated differential clock generator or FPGA clock output configured for LVDS/HSTL differential signaling is mandatory for functional operation.

What is the role of QVLD in system timing design?

QVLD is an edge-aligned valid-data indicator synchronized to CQ/CQ, not K/K. It eliminates the need for receiver-side delay-locked loops or manual strobe deskew - the FPGA or ASIC can use QVLD directly as a latch enable for Q[17:0]. This simplifies timing closure in high-speed interfaces where setup/hold margins are sub-100 ps.