Infineon Technologies CY7C1565V18-400BZC

Overview

CY7C1565V18 from Cypress Semiconductor is a 72-Mbit QDR-II+ SRAM with 2M × 36 organization, 4-word burst architecture, 2.5-cycle read latency, and dual DDR interfaces operating at 400 MHz (800 MT/s effective data rate). It features separate read/write ports, echo clocks (CQ/CQ), QVLD data-valid indicator, and HSTL I/O for high-speed networking and packet buffering applications.

For engineers reviewing the CY7C1565V18 datasheet, CY7C1565V18 pinout, CY7C1565V18 application, or CY7C1565V18 equivalent, key selection criteria include 2M × 36 depth-width configuration, 165-ball FBGA package, 1.8V core / 1.4–1.8V I/O supply range, DLL-enabled timing alignment, and JTAG 1149.1 test access support.

Technical Context

This device implements QDR-II+ architecture with fully independent synchronous read and write ports sharing a multiplexed address bus. Address latching occurs on alternating rising edges of K and K clocks, enabling concurrent access without bus turnaround. The internal Delay Lock Loop (DLL) aligns CQ/CQ echo clocks to K/K for precise DDR data capture.

All data transfers occur on both rising edges of K and K - four 36-bit words per read/write burst - delivering sustained 28.8 GB/s bandwidth. Write operations use on-chip self-timed circuitry, while byte write selects (BWS[3:0]) enable granular 9-bit byte-level updates without disturbing adjacent data.

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 Pb-free option available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1563V18 and AS7C3256A-15JCIN, CY7C1565V18 delivers double the per-cycle data width (36-bit vs. 18/8-bit), integrated DLL timing control, and true concurrent read/write - making it uniquely suited for modern packet processing where bandwidth and determinism are co-constrained.

Availability

CY7C1565V18 is available at Aetrix Electronics and suitable for high-speed packet buffering, network switch fabric memory, optical transport framer buffers, and HPC interconnect cache applications requiring stable component supply and long-term industrial availability.

Supply support for CY7C1565V18 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) is a U.S.-based semiconductor company specializing in high-performance memory, microcontrollers, and programmable analog/digital ICs for communications, industrial, and automotive markets.

CY7C1565V18 belongs to the QDR-II+ SRAM product line, designed specifically for deterministic, high-bandwidth memory interfacing in networking and telecom infrastructure where concurrent read/write, low latency, and DDR timing precision are mandatory.

FAQ

What is the function of the ZQ pin on CY7C1565V18?

The ZQ pin calibrates the output driver impedance of Q[35:0], CQ, and CQ signals to match the system's data bus characteristic impedance. It must be connected to a 240 Ω resistor to ground; alternatively, tying it to VDDQ enables minimum-impedance mode. Direct connection to GND or leaving it unconnected violates specification and risks signal integrity failure.

Can CY7C1565V18 operate without the DLL enabled?

Yes - asserting DOFF low disables the DLL, reverting the device to QDR-I timing mode with maximum 167 MHz operation. In this mode, echo clocks (CQ/CQ) remain functional but lose DLL alignment, and read latency increases to 3 cycles. This mode is intended for fallback timing validation or reduced-power operation, not full QDR-II+ performance.

How does the BWS[3:0] signal map to the 36-bit data bus?

BWS[3:0] controls four independent 9-bit byte lanes: BWS0 → D[8:0], BWS1 → D[17:9], BWS2 → D[26:18], BWS3 → D[35:27]. Each active-low signal enables writing to its corresponding 9-bit segment; deselected lanes retain prior data. This enables atomic partial-word updates without read-modify-write cycles.

Is CY7C1565V18 compatible with standard HSTL-18 I/O standards?

Yes - CY7C1565V18 implements HSTL Class I and II compliant drivers and receivers, supporting VDDQ = 1.4 V to 1.8 V. Its VREF input sets the switching threshold at 0.5 × VDDQ, and ZQ calibration ensures output impedance matches 50 Ω transmission lines - meeting JEDEC HSTL-18 specifications for point-to-point and multidrop configurations.