Cypress Semiconductor Corp CY7C1563V18-400BZXC

Overview

CY7C1563V18 from Cypress Semiconductor is a 4M × 18-bit (72-Mbit), 1.8V QDR-II+ SRAM with separate read/write ports, 400 MHz clock support, 2.5-cycle read latency, and DDR interfaces on both ports delivering 800 MT/s effective data rate. It uses HSTL I/O, DLL-based timing alignment, and 165-ball FBGA packaging for high-speed networking and packet buffering applications.

For engineers reviewing the CY7C1563V18 datasheet, CY7C1563V18 pinout, CY7C1563V18 application, or CY7C1563V18 equivalent, key selection criteria include burst depth (4-word), port independence, echo clock (CQ/CQ) timing support, QVLD validity signaling, and VDDQ range (1.4V to 1.8V) compatibility with system I/O voltage planning.

Technical Context

This device implements synchronous pipelined QDR-II+ architecture with independent read and write address/data paths latched on alternating rising edges of K and K clocks. Its dual DDR interfaces eliminate bus turnaround, enabling concurrent read and write operations without contention.

The internal Delay Lock Loop (DLL) aligns CQ/CQ echo clocks to K/K for precise data capture at 400 MHz, while QVLD provides edge-aligned valid-data indication. Address inputs are multiplexed across both ports using only 20 pins (A[19:0]) for the 4M × 18 configuration.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 mm × 1.4 mm, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1565V18, CY7C1563V18 offers higher depth (4M vs. 2M) at narrower width (18-bit), better matching to 16/18-bit bus architectures; versus AS7C3256A-15JCIN, it delivers 53× higher effective bandwidth and deterministic latency essential for real-time traffic.

Availability

CY7C1563V18 is available at Aetrix Electronics and suitable for high-speed network switches, telecom line cards, and LTE baseband processing systems requiring stable component supply and long-term lifecycle assurance.

Supply support for CY7C1563V18 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 communications, industrial, and automotive markets.

The QDR-II+ SRAM product line targets applications demanding ultra-low latency, concurrent access, and deterministic timing-especially in packet infrastructure and real-time signal processing.

FAQ

What is the function of the DOFF pin on CY7C1563V18?

The DOFF pin disables the internal Delay Lock Loop when pulled LOW. In this mode, the device reverts to QDR-I timing behavior with maximum clock frequency reduced to 167 MHz. This fallback mode allows interoperability with legacy controllers or simplified timing validation, though all QDR-II+ advantages-including 400 MHz operation and echo clock precision-are lost.

How does the ZQ pin affect signal integrity?

The ZQ pin connects to an external resistor to ground (typically 100 Ω) to calibrate the output driver impedance of Q[17:0], CQ, and CQ pins to 0.2 × RQ (e.g., 20 Ω). This dynamic calibration compensates for voltage, temperature, and process variations, ensuring consistent HSTL waveform shape and reducing reflection-induced jitter at 400 MHz.

Can CY7C1563V18 operate with only one clock input?

No. The device requires both K and K clock inputs to function correctly. These differential clocks control separate register stages for read and write data paths. Using only K violates the timing architecture: K samples write data and address, while K samples read address and drives read data. Omitting either clock prevents valid operation per the QDR-II+ specification.

What is the role of BWS[1:0] in CY7C1563V18?

BWS[1:0] are active-low byte write select signals that enable selective updating of 9-bit subwords within the 18-bit D[17:0] bus. BWS0 controls D[8:0], and BWS1 controls D[17:9]. When a BWS bit is HIGH, the corresponding byte remains unchanged during the write cycle-preserving prior data without requiring a read-modify-write sequence.