Cypress Semiconductor Corp CY7C1520V18-167BZXC

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, 167 MHz maximum operating frequency variant, 165-ball FBGA package, burst-aligned read/write timing, and JTAG 1149.1 test access port compliance.

Technical Context

This SRAM uses a synchronous pipelined architecture with two independent input clock domains (K/K for address/control/data capture) and two output clock domains (C/C for data/echo clock generation). The internal burst counter accepts A0 as LSB to sequence two 36-bit words per access.

All synchronous inputs-including R/W, LD, BWS[3:0], and DQ[35:0]-are registered on rising edges of K/K; all outputs-including Q[35:0], CQ, and CQ-are edge-aligned to C/C (or K/K in single-clock mode). The DLL ensures precise data-eye placement relative to echo clocks, and ZQ enables dynamic output impedance calibration against system bus termination.

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. Package supports high-density routing and thermal dissipation for sustained DDR operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1518V18, CY7C1520V18 offers denser single-channel data path and simplified routing; versus IS61WV102436BLL, it trades peak speed for guaranteed timing closure via DLL and echo clocks-critical in thermally variable telecom environments.

Availability

CY7C1520V18 is available at Aetrix Electronics and suitable for telecom line cards, network packet buffers, high-speed test equipment, and radar signal processing requiring stable component supply across extended temperature ranges and long production lifecycles.

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 mixed-signal ICs for communications, industrial, and automotive systems, with emphasis on signal integrity and timing precision.

CY7C1520V18 belongs to Cypress's DDR-II synchronous SRAM product line, engineered specifically for deterministic, low-latency buffering in multi-gigabit serial infrastructure where echo-clock synchronization and DLL-assisted timing closure are mandatory.

FAQ

What is the function of the ZQ pin on CY7C1520V18?

The ZQ pin enables dynamic output impedance calibration. When connected to a 240 Ω resistor to ground, it sets the HSTL output driver impedance to 48 Ω (0.2 × 240 Ω), ensuring optimal signal integrity on matched-impedance transmission lines. Direct connection to VDDQ enables minimum-impedance mode; floating or grounding ZQ is prohibited.

Does CY7C1520V18 support single-clock operation?

Yes. When only K and K are supplied and C/C are left unconnected, the device defaults to single-clock mode: read data and echo clocks are driven relative to K/K edges instead of C/C. All timing parameters shift accordingly, and DLL remains active to align internal data launch to K/K.

How does the burst counter operate in CY7C1520V18?

The burst counter uses A0 as its least significant bit and increments linearly to generate the second 36-bit word address. For each LD assertion, the device reads/writes two consecutive 36-bit locations: one at the externally provided address and the next at address+1, eliminating need for external address sequencing logic.

Can CY7C1520V18 be used without enabling the DLL?

Yes-asserting DOFF LOW disables the DLL. However, AC timing parameters change significantly: data-to-CQ skew increases, and setup/hold margins shrink. Cypress specifies separate timing tables for DLL-on and DLL-off modes; disabling DLL is recommended only for prototyping or legacy system compatibility where timing裕度 exists.