Cypress Semiconductor Corp CY7C15632KV18-450BZXC

Overview

CY7C15632KV18-450BZXC 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, echo clocks (CQ/CQ), QVLD data-valid indicator, and 165-ball FBGA (13 × 15 × 1.4 mm) packaging. Used in high-bandwidth packet buffering for network switches and routers.

For engineers reviewing the CY7C15632KV18-450BZXC datasheet, CY7C15632KV18-450BZXC pinout, CY7C15632KV18-450BZXC application, or CY7C15632KV18-450BZXC equivalent, key selection factors include its 4 M × 18 configuration, 1.8 V core / 1.4–1.8 V I/O supply support, HSTL-compatible interfaces, PLL-based timing alignment, and JTAG 1149.1 test access capability.

Technical Context

The device implements a synchronous pipelined architecture with independent read and write ports sharing a multiplexed 20-bit address bus. Each port uses DDR signaling on K/K clocks, enabling 1000 MT/s effective data rate at 450 MHz input clock frequency.

Its QDR II+ operation relies on a phase-locked loop (PLL) for precise data placement; when DOFF is HIGH, it delivers 2.5-cycle read latency with full four-word burst; when DOFF is LOW, it reverts to QDR I mode (1-cycle latency, ≤167 MHz). Echo clocks CQ/CQ are free-running and edge-aligned to K/K for simplified high-speed capture.

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 option available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C15632KV18-500BZXC, the -450BZXC offers better power efficiency and relaxed timing closure at 450 MHz, while AS7C36256P-15JCIN sacrifices all QDR II+ advantages for cost and simplicity in non-pipelined applications.

Availability

CY7C15632KV18-450BZXC is available at Aetrix Electronics and suitable for network switching infrastructure, high-speed test instrumentation, and telecom baseband subsystems requiring stable component supply across extended production lifecycles.

Supply support for CY7C15632KV18-450BZXC 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 is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, sensing, connectivity, and memory solutions for industrial, automotive, and communications markets.

This device belongs to Infineon's QDR® II+ SRAM product line, engineered specifically for deterministic, high-throughput memory buffering in packet-switched and real-time signal processing systems where dual-port concurrency and sub-3-cycle latency are critical.

FAQ

What is the function of the DOFF pin on CY7C15632KV18-450BZXC?

The DOFF (PLL Turn Off) pin controls the internal phase-locked loop. When pulled HIGH, the device operates in full QDR II+ mode with 2.5-cycle read latency and 450 MHz capability. When pulled LOW, the PLL is disabled and the device reverts to QDR I timing with 1-cycle latency and reduced maximum frequency (≤167 MHz). This enables backward compatibility and flexible timing configuration without hardware redesign.

How does the ZQ pin affect signal integrity?

The ZQ pin enables output impedance calibration for Q[17:0], CQ, and CQ signals. When connected to a precision resistor (typically 240 Ω) to ground, the device tunes its driver strength to match the system's data bus characteristic impedance (Z₀), minimizing reflections and improving eye diagram margin. Leaving ZQ unconnected or tied to GND violates specification and risks signal integrity failure at 450 MHz.

Can CY7C15632KV18-450BZXC be used without the echo clocks CQ and CQ?

Yes - CQ and CQ are optional timing aids, not mandatory for basic operation. The device drives Q[17:0] synchronously to K/K edges regardless. However, omitting CQ/CQ increases timing margin requirements on the receiving controller side, especially above 300 MHz, because the controller must sample Q[17:0] relative to K/K rather than a dedicated echo reference. For robust 450 MHz operation, Infineon strongly recommends using CQ/CQ for capture alignment.

What is the role of the QVLD signal during burst reads?

QVLD is an edge-aligned, synchronous output that asserts for exactly one K/K cycle per valid 18-bit word in the four-word burst. It indicates which Q[17:0] words contain meaningful data, eliminating ambiguity during partial bursts or port deselection. Unlike simple clock-enable schemes, QVLD accounts for internal pipeline delays and guarantees validity timing even under dynamic RPS assertion/deassertion, making it essential for reliable high-speed data capture.