Infineon Technologies CY7C1515JV18-300BZI

Overview

CY7C1515JV18 from Cypress Semiconductor is a 72-Mbit QDR® II SRAM with 2M × 36 organization, 300 MHz clock operation, DDR interfaces on both read and write ports (600 MHz data rate), 1.5-cycle read latency with DLL enabled, and 165-ball FBGA (15 × 17 × 1.4 mm) package. It serves as a high-bandwidth, low-latency memory buffer in network packet processors and telecom line cards requiring concurrent read/write access without bus turnaround.

For engineers reviewing the CY7C1515JV18 datasheet, CY7C1515JV18 pinout, CY7C1515JV18 application, or CY7C1515JV18 equivalent, key selection criteria include burst depth (4-word), dual-clock timing (K/K and C/C), echo clock support (CQ/CQ), HSTL-18 I/O compatibility, and DLL-enabled latency control for synchronous system integration.

Technical Context

The CY7C1515JV18 implements a true dual-port QDR II architecture with physically separate read and write data paths-Q[35:0] outputs and D[35:0] inputs-enabling simultaneous read and write operations without contention. Its internal 4-array structure (4 × 512K × 36) supports depth expansion via RPS/WPS and BWS[3:0], while address multiplexing reduces pin count to 19 address lines.

Timing is governed by four independent clocks: K/K for input capture and write initiation, C/C for output data strobing, and CQ/CQ echo clocks synchronized to C/C for precise receiver deskewing. The DLL aligns internal delays to achieve 1.5-cycle read latency at 300 MHz; disabling it via DOFF reverts to QDR I mode with 1-cycle latency up to 167 MHz.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 mm × 1.4 mm body, RoHS-compliant, 1.0 mm ball pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T36150 and IS61WV102436B, the CY7C1515JV18 uniquely balances 300 MHz operation, DLL configurability, echo clock support, and mature QDR II ecosystem compatibility - making it optimal for upgrades from CY7C1513JV18 and integration into established telecom reference designs.

Availability

CY7C1515JV18 is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, baseband processing in 4G/LTE infrastructure, and high-performance computing cache applications requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.

Supply support for CY7C1515JV18 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 systems-on-chip for industrial, automotive, and communications markets.

The QDR® II SRAM product line was designed specifically for bandwidth-constrained, low-latency applications in networking and telecommunications equipment - emphasizing deterministic timing, concurrent access, and system-level signal integrity.

FAQ

What is the function of the DOFF pin on CY7C1515JV18?

The DOFF (DLL Turn Off) pin is an active-low control that disables the internal Delay Lock Loop. When pulled LOW, the device operates in QDR I mode with 1-cycle read latency and maximum frequency reduced to 167 MHz. In normal operation, DOFF must be tied HIGH via a ≤10 kΩ pull-up resistor to enable 1.5-cycle latency at 300 MHz.

How does the ZQ pin affect output drive strength?

The ZQ pin connects to an external 240 Ω resistor to ground to calibrate the output impedance of Q[35:0] and CQ/CQ signals to 48 Ω (0.2 × 240 Ω). This ensures consistent HSTL-18 signal integrity across process/voltage/temperature variations. Leaving ZQ unconnected or tying it to GND violates specification and may cause timing violations.

Can CY7C1515JV18 operate with only a single clock domain?

Yes - the device supports single-clock mode where K/K serve as both input and output clocks. In this mode, C/C are unused, and Q[35:0] data is driven on rising edges of K/K. However, echo clocks (CQ/CQ) remain functional and synchronized to K/K, preserving deskew capability for receiver-side capture.

What is the purpose of BWS[3:0] in the 36-bit configuration?

BWS[3:0] are active-low byte write select signals that independently enable or mask 9-bit byte lanes within the 36-bit D[35:0] bus. BWS0 controls D[8:0], BWS1 controls D[17:9], BWS2 controls D[26:18], and BWS3 controls D[35:27]. Deasserting any BWS prevents corresponding data from being written, preserving unmasked bytes during partial writes.