Cypress Semiconductor Corp CY7C1515V18-167BZC

Overview

CY7C1515V18 from Cypress Semiconductor is a 72-Mbit QDR-II SRAM with 2M × 36 organization, designed for high-bandwidth packet buffering in networking ASICs and FPGA-based line cards. It supports concurrent read/write operations at 167 MHz clock frequency (334 MT/s DDR), delivers 24 Gbps peak bandwidth, uses separate K/K and C/C differential clock pairs for precise timing control, and features echo clocks (CQ/CQ) for simplified high-speed data capture.

For engineers reviewing the CY7C1515V18 datasheet, CY7C1515V18 pinout, CY7C1515V18 application, or CY7C1515V18 equivalent, key selection criteria include burst depth (4-word), x36 interface width, 1.8 V core / 1.4–1.8 V I/O supply range, DLL-enabled timing accuracy, and FBGA-165 package compatibility with high-density routing constraints.

Technical Context

The CY7C1515V18 implements QDR-II architecture with fully independent read and write ports sharing a single multiplexed address bus. Address latching occurs on alternating rising edges of K/K, enabling 4-word burst transfers per access without bus turnaround. Internal pipelining allows back-to-back read and write commands with zero cycle overlap penalty.

It uses HSTL Class I output drivers with programmable drive strength controlled via ZQ impedance calibration. The integrated Delay Lock Loop (DLL) aligns CQ/CQ echo clocks to output data edges within ±50 ps skew, and DOFF pin enables deterministic DLL bypass for legacy timing closure.

Key Specifications

Pinout & Package

165-ball Fine-Pitch Ball Grid Array (FBGA) package, 15 mm × 17 mm footprint, 1.4 mm height, RoHS-compliant, with 0.8 mm ball pitch and standard JEDEC MO-245AC mechanical outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3615L10PA and IS61WV102436B, the CY7C1515V18 provides double the density, 2.4× higher bandwidth, DLL-controlled timing precision, and true concurrent access - making it the sole choice for OC-192+ and sub-100 ns latency systems.

Availability

CY7C1515V18 is available at Aetrix Electronics and suitable for telecom line cards, network processor buffers, FPGA-based protocol analyzers, and high-frequency trading switches requiring stable component supply across extended product lifecycles.

Supply support for CY7C1515V18 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 fabless semiconductor company specializing in high-performance memory, microcontrollers, and connectivity solutions for industrial, automotive, and communications markets.

The QDR-II SRAM product line was engineered specifically for deterministic, low-latency, high-throughput buffering in packet-switched infrastructure - targeting ASIC/FPGA co-designs where bus efficiency and timing predictability are critical.

FAQ

What is the minimum supported VDDQ voltage for CY7C1515V18?

The device supports VDDQ from 1.4 V to 1.8 V. Operation below 1.4 V is not guaranteed and may cause HSTL output driver malfunction or timing violations. At 1.4 V, output swing is reduced to ~0.7 V, requiring receiver threshold adjustment.

Can CY7C1515V18 operate without connecting the ZQ pin?

No. ZQ must be connected either to a 240 Ω resistor to ground for calibrated 48 Ω output impedance or directly to VDDQ for minimum impedance mode. Leaving ZQ floating or tied to VSS violates Absolute Maximum Ratings and risks output driver damage.

How does the DOFF pin affect timing parameters?

When DOFF is pulled LOW, the internal DLL is disabled and output timing shifts to fixed-delay mode: tAC increases by 0.8 ns typical, and CQ/CQ phase relationship becomes static rather than dynamically aligned. All DLL-related specs (e.g., tDQSKEW) no longer apply.

Is CY7C1515V18 pin-compatible with other QDR-II family members like CY7C1513V18?

No. Although all share the same 165-ball FBGA footprint, pin functions differ significantly: CY7C1515V18 uses BWS[3:0] and A[18:0], while CY7C1513V18 uses BWS[1:0] and A[19:0]; Q[35:0] and D[35:0] occupy different ball locations. Direct substitution requires PCB redesign.