Cypress Semiconductor Corp CY7C1520AV18-250BZXC

Overview

CY7C1520AV18-250BZXC from Cypress Semiconductor is a 72-Mbit (2 M × 36) DDR-II synchronous SRAM with two-word burst architecture, 1.8-V core supply, HSTL I/O, and 250 MHz clock operation enabling 500 MT/s data transfer. It uses dual input clocks (K/K̄) for address/data capture and dual output clocks (C/C̄) with echo clocks (CQ/CQ̄) for precise DDR timing in high-speed memory subsystems. Designed for networking packet buffers and telecom line cards requiring low-latency, burst-mode memory access.

For engineers reviewing the CY7C1520AV18-250BZXC datasheet, CY7C1520AV18-250BZXC pinout, CY7C1520AV18-250BZXC application, or CY7C1520AV18-250BZXC equivalent, key selection criteria include DDR-II burst latency (1.5 cycles with DLL enabled), 165-ball FBGA package compatibility, HSTL-18 I/O voltage range (1.4 V–1.8 V), and JTAG 1149.1 test port support for system-level validation.

Technical Context

The device implements a synchronous pipelined architecture with internal delay-locked loop (DLL) for accurate data placement relative to C/C̄ clocks, supporting 1.5-cycle read latency in DLL-on mode and 1-cycle latency in DLL-off (DDR-I) mode up to 167 MHz. Burst counter logic increments A0 internally to deliver two consecutive 36-bit words per access.

All synchronous inputs (A[20:0], R/W, BWS[3:0], LD) are registered on rising edges of K/K̄; data outputs DQ[35:0] are edge-aligned to C/C̄ and echoed via CQ/CQ̄, eliminating board-level skew compensation. ZQ pin enables dynamic output impedance tuning to match 50 Ω system buses.

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, bottom thermal pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DDR-II SRAM applications.

Compared with IS61WV102436B and R1EX24036AS, CY7C1520AV18-250BZXC uniquely combines DLL-based timing precision, echo clocks for skew-insensitive capture, and JTAG testability-making it optimal for high-reliability, high-speed memory subsystems where timing margin and test coverage are critical.

Availability

CY7C1520AV18-250BZXC is available at Aetrix Electronics and suitable for telecom line cards, network packet buffers, FPGA-based protocol analyzers, and industrial real-time controllers requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for CY7C1520AV18-250BZXC 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, automotive, and communications markets.

CY7C1520AV18 belongs to Cypress's DDR-II SRAM product line, engineered specifically for high-bandwidth, low-latency memory subsystems in networking infrastructure and real-time embedded systems demanding deterministic timing and robust signal integrity.

FAQ

What is the minimum supported clock frequency for CY7C1520AV18-250BZXC?

The device operates down to DC for functional operation, but AC timing specifications (e.g., tCK, tAC) are guaranteed only at frequencies ≥167 MHz in DLL-off mode and ≥200 MHz in DLL-on mode. Below 167 MHz, setup/hold margins must be verified per application conditions using the device's static timing model.

Can CY7C1520AV18-250BZXC operate without connecting the ZQ pin?

No. ZQ must be connected either to a 50 Ω resistor to ground for impedance calibration or directly to VDDQ for minimum-drive mode. Leaving ZQ floating or tied to VSS violates Absolute Maximum Ratings and may cause output driver instability or excessive current draw.

How does the DLL affect read latency in CY7C1520AV18-250BZXC?

With DLL enabled, read latency is fixed at 1.5 clock cycles (tRL = 1.5 × tCK), ensuring consistent timing across voltage/temperature. With DLL disabled (DOFF = LOW), latency reduces to 1 cycle but maximum frequency drops to 167 MHz and timing margins tighten significantly due to uncalibrated clock-to-output skew.

Is CY7C1520AV18-250BZXC pin-compatible with CY7C1518AV18-250BZXC?

No. Although both use the same 165-ball FBGA package, pin assignments differ significantly: CY7C1518AV18 has DQ[17:0] and BWS[1:0], while CY7C1520AV18 routes DQ[35:0] and BWS[3:0] across distinct ball locations. Direct replacement requires PCB redesign and signal mapping verification.