Cypress Semiconductor Corp CY7C1564XV18-366BZC

Overview

CY7C1564XV18 from Cypress Semiconductor is a 2M × 36, 72-Mbit QDR® II+ Xtreme SRAM with dual independent read/write ports, 450 MHz clock operation (900 Mbps DDR data rate), 2.5-cycle read latency when DOFF = HIGH, and HSTL I/O interface supporting 1.5 V VDDQ. It delivers high-bandwidth memory access for network packet buffering in telecom line cards.

For engineers reviewing the CY7C1564XV18 datasheet, CY7C1564XV18 pinout, CY7C1564XV18 application, or CY7C1564XV18 equivalent, key selection criteria include burst depth (two 36-bit words per cycle), echo clock timing (CQ/CQ), QVLD validity signaling, PLL-enabled low-latency modes, and FBGA-165 package compatibility with high-speed PCB layout constraints.

Technical Context

The CY7C1564XV18 implements a synchronous pipelined architecture with physically separate read and write data paths, eliminating bus turnaround overhead. Its two-word burst transfers 72 bits per K/K clock cycle-enabling sustained 900 MB/s bandwidth at 450 MHz.

It uses a Phase-Locked Loop (PLL) to align CQ/CQ echo clocks with K/K for precise DDR capture timing, while the DOFF pin selects between QDR-II+ mode (2.5-cycle latency, up to 450 MHz) and QDR-I mode (1-cycle latency, ≤167 MHz). Address inputs A[19:0] are multiplexed for both ports and latched on alternating rising edges of K and K.

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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T36120 and IS61WV102432BLL, the CY7C1564XV18 uniquely delivers 450 MHz DDR bandwidth with selectable 2.5-cycle or 1-cycle latency via DOFF, making it optimal for next-generation packet processing and real-time signal capture where timing agility and peak throughput are co-critical.

Availability

CY7C1564XV18 is available at Aetrix Electronics and suitable for network infrastructure, wireless baseband processing, high-speed test instrumentation, and real-time video encoding requiring stable component supply and long-term obsolescence management.

Supply support for CY7C1564XV18 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 networking, automotive, and industrial applications, with emphasis on signal integrity and timing precision.

The QDR® II+ Xtreme SRAM product line targets high-speed packet buffering and real-time data streaming systems requiring deterministic latency, concurrent access, and DDR bandwidth without bus turnaround penalties.

FAQ

What is the function of the DOFF pin on CY7C1564XV18?

The DOFF pin controls the internal PLL: when pulled HIGH, the device operates in QDR-II+ mode with 2.5-cycle read latency and up to 450 MHz clock frequency; when pulled LOW, the PLL is disabled and the device reverts to QDR-I timing with 1-cycle latency and maximum 167 MHz operation. This allows runtime mode selection based on system timing budget.

How does the ZQ pin affect signal integrity?

The ZQ pin connects to an external resistor to ground (typically 240 Ω) to calibrate the output driver impedance of Q[35:0], CQ, and CQ pins to match the PCB trace characteristic impedance. This calibration reduces signal reflections and ensures clean eye diagrams at 450 MHz, eliminating the need for discrete series termination resistors.

Can CY7C1564XV18 perform read and write operations simultaneously?

Yes - the CY7C1564XV18 has fully independent read and write ports with separate data buses (Q[35:0] and D[35:0]), clocks (K and K), and port selects (RPS/WPS). Concurrent transactions are supported without arbitration or bus contention, enabling true full-duplex memory access essential for packet buffering and real-time streaming.

What is the purpose of QVLD and how is it timed?

QVLD is a synchronous output that asserts coincident with the first valid word of a read burst on Q[35:0]. It is edge-aligned with CQ and CQ echo clocks - not with K/K - providing a receiver-friendly strobe that accounts for internal propagation delay. This eliminates setup/hold uncertainty for FPGA capture logic using echo-clock sampling.