Cypress Semiconductor Corp CY7C1520V18-200BZCT

Overview

CY7C1520V18 from Cypress Semiconductor is a 72-Mbit (2M × 36) synchronous pipelined DDR-II SRAM with 1.8V core supply, 300 MHz clock support, and dual-edge DDR data transfer at 600 Mbps per pin. It implements 2-word burst architecture with echo clocks (CQ/CQ), DLL-based timing alignment, and HSTL I/O for high-speed networking and packet buffering applications.

For engineers reviewing the CY7C1520V18 datasheet, CY7C1520V18 pinout, CY7C1520V18 application, or CY7C1520V18 equivalent, key selection criteria include its 2M × 36 organization, 165-ball FBGA package, 21-bit address bus with A0-controlled burst counter, and support for independent byte write select (BWS[3:0]) in high-throughput memory subsystems.

Technical Context

This SRAM uses a synchronous pipelined architecture with DDR-II interface: addresses are latched on alternate rising edges of K/K, and read data is driven on rising edges of C/C (or K/K in single-clock mode). The internal burst counter accepts A0 to sequence two 36-bit words per access.

All synchronous inputs (R/W, LD, BWS[3:0], A[20:0], DQ[35:0]) register on K/K edges; all outputs (DQ[35:0], CQ, CQ) register on C/C edges. The DLL aligns output data to echo clocks with sub-cycle accuracy, while ZQ enables dynamic output impedance tuning to 0.2×RQ.

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, JEDEC MO-245 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1518V18, CY7C1520V18 trades address width for wider data path-enabling fewer cycles per 64-byte transfer-while IS45S32800J-3BLI replaces SRAM determinism with DRAM density and cost advantages at the expense of guaranteed latency.

Availability

CY7C1520V18 is available at Aetrix Electronics and suitable for telecom infrastructure, high-speed test equipment, and network processor offload applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for CY7C1520V18 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 communications, industrial, and automotive markets.

CY7C1520V18 belongs to the DDR-II SyncBurst SRAM product line, engineered specifically for deterministic, low-latency, high-bandwidth buffering in packet-processing and instrumentation systems where SRAM reliability and timing precision outweigh DRAM density advantages.

FAQ

What is the minimum supported clock frequency for CY7C1520V18?

The device operates down to DC for functional operation, but AC timing specifications (e.g., tKHK, tDS, tDH) are guaranteed only from 167 MHz up to 300 MHz per the Selection Guide. Below 167 MHz, setup/hold margins must be verified per application conditions using the full AC timing table in Rev. *E datasheet.

Can CY7C1520V18 operate in single-clock mode without C/C inputs?

Yes. When C and C are tied to K and K respectively, the device enters single-clock mode. In this mode, read data and echo clocks (CQ/CQ) are referenced to K/K, and timing parameters shift to tKHCK and tKQX values specified in the datasheet's single-clock timing section.

How does ZQ calibration affect signal integrity on the DQ bus?

ZQ connects to an external resistor (typically 100 Ω to ground) to set output driver impedance to 0.2×RQ = 20 Ω. This matches standard 50 Ω transmission lines when used with series termination, reducing reflections and improving eye diagram opening at 600 Mbps DDR rates.

Is the DOFF pin required to be actively driven in normal operation?

No. DOFF is internally pulled up; it may be left unconnected or tied HIGH for normal DLL-enabled operation. Only drive it LOW when DLL must be disabled-for example, to reduce power in standby or when echo-clock alignment is unnecessary for system timing budget.