Cypress Semiconductor Corp CY7C15632KV18-400BZC

Overview

CY7C15632KV18-400BZC from Infineon Technologies (formerly Cypress) is a 72-Mbit QDR® II+ SRAM with 4 M × 18 organization, 400 MHz maximum clock frequency, 2.5-cycle read latency (DOFF = HIGH), and 165-ball FBGA (13 × 15 × 1.4 mm) package. It features separate read/write ports, DDR interfaces on both ports, echo clocks (CQ/CQ), and QVLD data-valid indicator - enabling high-throughput, low-latency memory access in packet-forwarding engines and network line cards.

For engineers reviewing the CY7C15632KV18-400BZC datasheet, CY7C15632KV18-400BZC pinout, CY7C15632KV18-400BZC application, or CY7C15632KV18-400BZC equivalent, key selection criteria include its 4-word burst architecture, HSTL I/O compatibility (VDDQ = 1.4–1.8 V), PLL-based timing control, and depth expansion support via RPS/WPS port selects.

Technical Context

The device implements a synchronous pipelined QDR II+ architecture with independent read and write ports sharing a multiplexed 20-bit address bus. All inputs (A, D[17:0], RPS, WPS, BWS[1:0], DOFF, ZQ) are registered on rising edges of K or K clocks, and all outputs (Q[17:0], CQ, CQ, QVLD) are edge-aligned to those clocks. The internal PLL enables precise 2.5-cycle read latency when DOFF is HIGH.

It supports concurrent read/write transactions without bus turnaround, delivers 1000 MT/s effective data rate via DDR signaling, and maintains full data coherency across bursts. Depth expansion is implemented using RPS and WPS signals to enable independent operation of up to four 4 M × 18 devices in a bank.

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-speed dual-port SRAM applications.

Compared with AS7C362000B-400BIN and IS61WV102418BLL-400BLI, CY7C15632KV18-400BZC delivers deterministic 2.5-cycle latency, eliminates external strobe logic via QVLD/CQ, and sustains full bandwidth under concurrent load - critical for real-time packet processing.

Availability

CY7C15632KV18-400BZC is available at Aetrix Electronics and suitable for high-speed packet buffering, network line card memory, telecom baseband processing, and ATE pattern memory requiring stable component supply and long-term lifecycle support.

Supply support for CY7C15632KV18-400BZC 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® II+ SRAM portfolio, including reliability validation, long-term manufacturing, and technical documentation continuity.

This device belongs to Infineon's high-performance synchronous SRAM product line, designed specifically for deterministic, low-latency memory subsystems in networking, telecom, and test equipment where bus turnaround overhead and timing uncertainty must be eliminated.

FAQ

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

The DOFF pin disables the internal PLL when asserted LOW, forcing the device into QDR I mode with 1-cycle read latency and a maximum operating frequency of 167 MHz. When DOFF is HIGH, the PLL enables full QDR II+ operation at up to 400 MHz with 2.5-cycle latency. This dual-mode capability allows designers to reuse the same footprint across different speed grades and timing budgets without hardware changes.

How does the ZQ pin calibrate output impedance, and what external component is required?

The ZQ pin connects to an external precision resistor (RQ) tied to ground, enabling on-die calibration of CQ, CQ, and Q[17:0] output drivers to 0.2 × RQ. For example, a 60 Ω resistor sets driver impedance to 12 Ω. This compensates for process/voltage/temperature variation and ensures consistent signal integrity across voltage rails and board layouts - no external termination resistors are needed on data or echo clock lines.

Can CY7C15632KV18-400BZC support depth expansion, and how is it implemented?

Yes - depth expansion is supported using RPS (Read Port Select) and WPS (Write Port Select) signals. Each device in a bank responds only when its RPS/WPS is asserted, allowing up to four 4 M × 18 devices to form a 16 M × 18 memory space. Address bits beyond A[19:0] are decoded externally to generate RPS/WPS, enabling independent read/write access to each device without contention or arbitration logic.

What is the role of QVLD, and how does it differ from traditional RDY or VALID signals?

QVLD is a synchronous, edge-aligned output that indicates when Q[17:0] data is valid relative to CQ/CQ - not K/K. Unlike asynchronous READY signals, QVLD requires no setup/hold margin adjustment at the receiver and eliminates the need for phase-aligned capture latches. It directly enables single-register capture in FPGAs or ASICs, reducing timing closure effort and improving jitter tolerance in high-speed systems.