Cypress Semiconductor Corp CY7C1515AV18-250BZC

Overview

CY7C1515AV18 from Cypress Semiconductor is a 72-Mbit QDR-II SRAM with 2M × 36 organization, 1.8V core supply, and 1.4–1.8V I/O interface. It delivers 600 MHz DDR data transfer on independent read/write ports using separate K/K and C/C clock pairs, supports 4-word burst, and operates in 165-ball FBGA (15 × 17 × 1.4 mm) for high-bandwidth packet buffering in network line cards.

For engineers reviewing the CY7C1515AV18 datasheet, CY7C1515AV18 pinout, CY7C1515AV18 application, or CY7C1515AV18 equivalent, key selection criteria include QDR-II dual-port timing compliance, 250 MHz maximum operating frequency, DLL-enabled 1.5-cycle read latency, HSTL-18 I/O compatibility, and depth-expansion support via BWS[3:0] and port-select signals.

Technical Context

The CY7C1515AV18 implements true synchronous pipelined QDR-II architecture with physically isolated read and write data paths-no bus turnaround required. Its 19-bit address bus accesses a 512K × 36 internal array across four sub-arrays, latched on alternating rising edges of K and K clocks.

Read operations use C/C echo clocks to deskew output timing; write operations use self-timed internal logic synchronized to K/K. The Delay Lock Loop (DLL) enables precise 1.5-cycle read latency at 250 MHz, while DOFF pin disables DLL to fall back to QDR-I mode with 1-cycle latency up to 167 MHz.

Key Specifications

Pinout & Package

165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 mm × 1.4 mm body, 0.8 mm ball pitch, RoHS-compliant. Thermal pad exposed on underside for enhanced heat dissipation in high-throughput memory subsystems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1515AV18-250BZI, the BZC variant trades extended temperature range for lower cost in commercial environments; AS7C3256A lacks all QDR-II features and cannot replace it in high-speed data-path roles.

Availability

CY7C1515AV18 is available at Aetrix Electronics and suitable for high-speed packet buffering, network processor interfacing, telecom baseband processing, and ATE memory subsystems requiring stable component supply and long-term obsolescence management.

Supply support for CY7C1515AV18 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 systems, with emphasis on signal integrity and timing precision.

The QDR-II SRAM product line targets applications demanding deterministic latency, concurrent access, and DDR bandwidth without bus turnaround-specifically optimized for network infrastructure and real-time signal processing.

FAQ

What is the minimum supported clock frequency for CY7C1515AV18?

The device has no specified minimum clock frequency; it operates down to DC for static timing analysis. Functional operation requires stable K/K and C/C clocks meeting setup/hold requirements per the datasheet's AC timing tables. At very low frequencies, DLL lock time increases but does not prevent operation.

Can CY7C1515AV18 operate without connecting the ZQ pin?

No-ZQ must be connected either to a 100 Ω resistor to ground (for calibrated 20 Ω output impedance) or directly to VDDQ (for minimum impedance mode). Leaving ZQ floating or tied to VSS violates the absolute maximum ratings and may cause output driver instability or excessive current draw.

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

BWS0 controls D[8:0] (9 bits), BWS1 controls D[17:9], BWS2 controls D[26:18], and BWS3 controls D[35:27]. Each active-low signal enables its corresponding 9-bit byte group during write operations; deselected bytes retain prior contents, enabling partial-word updates without read-modify-write cycles.

Is the CQ/CQ echo clock required for proper read data capture?

Yes-CQ and CQ are essential for reliable high-speed read capture. They are phase-aligned copies of C and C, referenced to the Q[35:0] output drivers. Using CQ/CQ at the controller allows deskewing of flight-time mismatches across the 36-bit bus, ensuring setup/hold margin at 600 MT/s operation.