Infineon Technologies CY7C1545V18-375BZC

Overview

CY7C1545V18 from Cypress Semiconductor is a 2M × 36-bit, 72-Mbit QDR-II+ SRAM with separate read/write ports, 375 MHz clock operation (750 Mbps DDR data rate), 2.0-cycle read latency, and HSTL I/O supporting VDDQ = 1.4V–1.8V. It delivers concurrent high-bandwidth memory access for network packet buffering in telecom line cards and switch fabric controllers.

For engineers reviewing the CY7C1545V18 datasheet, CY7C1545V18 pinout, CY7C1545V18 application, or CY7C1545V18 equivalent, key selection criteria include burst depth (4-word), x36 bus width, DLL-enabled timing accuracy, echo clock (CQ/CQ) support for source-synchronous capture, and FBGA-165 package compatibility with high-speed PCB layout constraints.

Technical Context

This device implements QDR-II+ architecture with fully independent read and write ports sharing a single multiplexed address bus, enabling true simultaneous read/write operations without bus turnaround. Address latching occurs on alternating rising edges of K and K clocks, while all synchronous inputs and outputs are edge-aligned to these clocks.

The integrated Delay Lock Loop (DLL) ensures precise data placement relative to echo clocks CQ and CQ, supporting reliable 750 Mbps DDR transfers. The QVLD signal provides explicit data validity indication synchronized to CQ/CQ edges, eliminating setup/hold uncertainty in high-speed capture logic.

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-bandwidth dual-port SRAM applications.

Compared with IDT72T3615 and IS61WV102436B, CY7C1545V18 uniquely delivers 375 MHz DDR operation with DLL-calibrated timing and source-synchronous echo clocks - essential for deterministic high-speed packet processing where jitter tolerance is sub-100 ps.

Availability

CY7C1545V18 is available at Aetrix Electronics and suitable for network infrastructure, telecom baseband, high-speed test equipment, and switch fabric controller designs requiring stable component supply and long-term obsolescence management.

Supply support for CY7C1545V18 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 connectivity solutions for industrial and communications markets.

CY7C1545V18 belongs to Cypress's QDR-II+ SRAM product line, engineered specifically for deterministic, low-latency, high-bandwidth memory access in packet-switched networking and real-time signal processing systems.

FAQ

What is the minimum VDDQ voltage supported by CY7C1545V18?

The device supports VDDQ from 1.4 V to 1.8 V, as confirmed in the "Electrical Characteristics" section of the official datasheet (Document Number: 001-05389 Rev. *F). Operation below 1.4 V is not guaranteed and may cause HSTL input threshold violations or output drive weakness.

Can CY7C1545V18 operate without the DLL enabled?

Yes - asserting DOFF LOW disables the DLL and reverts the device to QDR-I timing mode, supporting up to 167 MHz operation. In this mode, echo clocks (CQ/CQ) remain functional but lose DLL-based phase alignment, and read latency increases to 2.5 cycles.

How many address pins does CY7C1545V18 require, and what is the addressing scheme?

CY7C1545V18 uses 19 address pins (A[18:0]) because its internal organization is 512K × 36. Addresses are multiplexed for both read and write ports and latched on alternating rising edges of K and K clocks - no external address demultiplexing logic is needed.

Is the ZQ pin mandatory for proper operation?

Yes - ZQ must be connected either to a 240 Ω resistor to ground (for 48 Ω output impedance calibration) or directly to VDDQ (for minimum drive strength). Leaving ZQ floating or connecting it to VSS violates the absolute maximum ratings and risks output driver damage or timing failure.