Cypress Semiconductor Corp CY7C15632KV18-450BZC

Overview

CY7C15632KV18-450BZC from Infineon Technologies (formerly Cypress) is a 72-Mbit QDR® II+ SRAM with separate read/write ports, 450 MHz clock operation, 2.5-cycle read latency, 18-bit × 4M organization, and 165-ball FBGA (13 × 15 × 1.4 mm) package. It delivers 1000 MT/s DDR data transfer on both ports and supports concurrent read/write transactions in high-bandwidth networking buffers and packet processors.

For engineers reviewing the CY7C15632KV18-450BZC datasheet, CY7C15632KV18-450BZC pinout, CY7C15632KV18-450BZC application, or CY7C15632KV18-450BZC equivalent, key selection criteria include burst depth (four-word), echo clock support (CQ/CQ), QVLD timing alignment, DOFF-configurable latency mode (QDR I vs. QDR II+), and HSTL-18 I/O compatibility with 1.4–1.8 V VDDQ.

Technical Context

This device implements a synchronous pipelined architecture with independent read and write ports sharing a multiplexed 20-bit address bus. All inputs (RPS, WPS, BWS[1:0], A[19:0], D[17:0]) are registered on rising edges of K/K clocks, and all outputs (Q[17:0], QVLD, CQ/CQ) are edge-aligned to those clocks.

The integrated 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). Echo clocks CQ/CQ provide source-synchronous data capture, while ZQ enables programmable output impedance matching to system bus termination.

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 CY7C15632KV18-500BZC, the -450BZC offers lower power and relaxed timing margins at 450 MHz; compared with AS7C3256A-15JCIN, it delivers >160× higher bandwidth and deterministic DDR timing but requires full QDR II+ interface design investment.

Availability

CY7C15632KV18-450BZC is available at Aetrix Electronics and suitable for high-speed network packet buffers, telecom line card memory, baseband processing caches, and ATE pattern memory requiring stable component supply across multi-year production cycles.

Supply support for CY7C15632KV18-450BZC 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 AG is a German semiconductor manufacturer specializing in power management, automotive ICs, and memory solutions, with global R&D and manufacturing infrastructure.

This device belongs to Infineon's QDR® II+ SRAM product line, designed specifically for deterministic, high-bandwidth buffering in packet-switched infrastructure where concurrent read/write and sub-ns timing predictability are mandatory.

FAQ

What is the function of the DOFF pin, and how does it affect timing behavior?

The DOFF pin controls the internal PLL: when HIGH, the device operates in QDR II+ mode with 2.5-cycle read latency and supports up to 450 MHz; when LOW, the PLL is disabled and the device reverts to QDR I mode with 1-cycle latency and a maximum frequency of 167 MHz. This allows backward compatibility with legacy QDR I controllers but sacrifices bandwidth and latency flexibility.

How are the echo clocks CQ and CQ used in system-level timing closure?

CQ and CQ are free-running, source-synchronous clocks derived from K and K respectively, edge-aligned to Q[17:0] output data. They serve as capture clocks for downstream receivers (e.g., FPGA input registers), eliminating setup/hold uncertainty caused by clock skew and flight time mismatch. Their phase relationship to Q[17:0] is guaranteed per datasheet AC specs, enabling robust timing closure at 1000 MT/s.

Can BWS[1:0] be used to perform partial writes without affecting other bytes in the same 18-bit word?

Yes. BWS0 controls write enable for D[8:0] (lower 9 bits) and BWS1 controls D[17:9] (upper 9 bits). When either is deasserted (HIGH), the corresponding byte group remains unaltered during the write cycle. This enables atomic updates to specific fields within a 18-bit word - for example, updating only status flags in a packet header without overwriting payload length or checksum fields.

What is the purpose of the ZQ pin, and what happens if it is left unconnected?

ZQ calibrates output driver impedance for CQ, CQ, and Q[17:0] to match the system data bus (typically 50 Ω). It must be connected to a precision resistor (e.g., 240 Ω) to ground; connecting directly to VDDQ enables minimum impedance mode. Leaving ZQ unconnected or tied to GND violates the absolute maximum ratings and may cause output overshoot, timing violations, or permanent damage due to undefined bias conditions.