Infineon Technologies CY7C1563V18-400BZC

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 enabling 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 rails.

Technical Context

This device implements QDR-II+ architecture with fully independent synchronous read and write ports sharing a single multiplexed address bus. Address latching occurs on alternating rising edges of K and K clocks, enabling concurrent access without bus turnaround.

It integrates a Delay Lock Loop (DLL) for precise data placement relative to echo clocks CQ and CQ, supports depth expansion via RPS/WPS controls, and delivers full data coherency through pipelined self-timed writes and dedicated output registers synchronized to K/K edges.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 mm × 1.4 mm body, 0.8 mm ball pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1565V18, CY7C1563V18 offers higher per-pin efficiency in 18-bit systems and simpler BWS decoding; compared with AS7C3256B-15JCIN, it delivers 16× more bandwidth and deterministic timing essential for real-time packet processing.

Availability

CY7C1563V18 is available at Aetrix Electronics and suitable for high-speed packet buffering, network switch fabric interfaces, FPGA-based protocol acceleration, and baseband processing applications requiring stable component supply and long-term industrial availability.

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, computing, and industrial markets.

CY7C1563V18 belongs to the QDR-II+ SRAM product line, engineered specifically for deterministic, low-latency, concurrent-access memory needs in networking and telecom infrastructure.

FAQ

What is the function of the DOFF pin on CY7C1563V18?

The DOFF pin disables the internal Delay Lock Loop when pulled low, forcing the device into QDR-I timing mode with reduced maximum frequency (167 MHz). For standard QDR-II+ operation at 400 MHz, DOFF must be externally pulled up to VDDQ using ≤10 kΩ resistor. Leaving DOFF floating or tied to ground invalidates QDR-II+ timing specifications.

How does the ZQ pin affect output drive strength?

ZQ connects to an external resistor (RQ) to ground to calibrate the output impedance of Q[17:0], CQ, and CQ pins to 0.2 × RQ. With RQ = 240 Ω, outputs are tuned to ~48 Ω for 50 Ω PCB traces. Alternatively, tying ZQ to VDDQ enables minimum-impedance mode (~25 Ω), useful for short, heavily loaded nets.

Can CY7C1563V18 operate with only one clock input?

No. The device requires both K and K clocks for full functionality: K captures address, RPS, and WPS; K captures write data D[17:0]. Both clocks drive DDR output timing and echo clock generation. Omitting either clock violates timing and prevents correct burst operation or data capture.

What happens to Q[17:0] when RPS is deasserted?

When RPS is deasserted (high), the read port is deselected. The current read burst completes, and Q[17:0] are automatically tri-stated on the next rising edge of the K clock. No dummy or undefined data is driven; the bus enters high-impedance state immediately after final valid word transfer.