Infineon Technologies CY7C1518V18-167BZC

Overview

CY7C1518V18 from Cypress Semiconductor is a 72-Mbit synchronous pipelined DDR-II SRAM configured as 4M × 18, operating at 167 MHz with 1.8 V core supply and HSTL I/O. It implements 2-word burst reads/writes synchronized to dual K/K input clocks and outputs data aligned to C/C or echo clocks CQ/CQ, targeting high-bandwidth buffering in network packet processors and telecom line cards.

For engineers reviewing the CY7C1518V18 datasheet, CY7C1518V18 pinout, CY7C1518V18 application, or CY7C1518V18 equivalent, key selection criteria include DDR-II timing compliance, 165-ball FBGA (15 × 17 × 1.4 mm) mechanical fit, 18-bit bidirectional data width, DLL-enabled data placement accuracy, and JTAG 1149.1 test port support for production validation.

Technical Context

The CY7C1518V18 uses a synchronous pipelined architecture with internal burst counter driven by A0, delivering two sequential 18-bit words per access. All synchronous inputs-address (A[21:0]), R/W, LD, and BWS[1:0]-are registered on rising edges of K and K clocks, ensuring precise setup/hold timing at 167 MHz.

Read data appears on DQ[17:0] aligned to rising edges of C/C or K/K, while echo clocks CQ/CQ are phase-matched to output data for simplified capture. The integrated Delay Lock Loop (DLL) dynamically compensates for process/voltage/temperature variation to maintain ±75 ps data-eye centering relative to CQ/CQ.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 mm × 1.4 mm body height, RoHS-compliant, 0.8 mm ball pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1518V18, the ISSI part trades DDR timing precision and burst efficiency for simplicity and cost in legacy systems, while the Microchip part delivers double the bandwidth at the expense of protocol complexity and layout constraints-making CY7C1518V18 optimal for balanced 167 MHz DDR-II integration.

Availability

CY7C1518V18 is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, baseband processing cache, and industrial motion controller FIFO applications requiring stable component supply and long-term obsolescence planning.

Supply support for CY7C1518V18 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, automotive, and industrial markets, with headquarters in San Jose, CA.

CY7C1518V18 belongs to Cypress's DDR-II synchronous SRAM product line, engineered specifically for deterministic-latency, high-throughput buffering in packet-switched and time-division multiplexed systems where DDR timing control and impedance stability are critical.

FAQ

What is the minimum supported input clock frequency for CY7C1518V18?

The CY7C1518V18 has no specified minimum clock frequency; it operates down to DC for static operation. However, DLL lock requires ≥10 MHz K/K input for stable phase alignment. Below this, DOFF must be asserted to bypass DLL, resulting in fixed-output delay timing per datasheet AC characteristics.

Can CY7C1518V18 operate in single-clock mode without C and C inputs?

Yes. When C and C are unconnected or tied to static logic levels, the device defaults to single-clock mode using K and K for both input latching and output timing. In this mode, CQ and CQ are generated relative to K/K, and data appears on DQ[17:0] aligned to K/K rising edges.

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

ZQ calibration adjusts DQ[17:0] and CQ/CQ output driver impedance to match the PCB trace characteristic impedance (typically 48–50 Ω). With a 240 Ω resistor to ground, it achieves ±10% impedance accuracy, reducing reflection-induced eye closure and improving timing margin at 334 MT/s.

Is CY7C1518V18 pin-compatible with other devices in the CY7C15xxV18 family?

No. While all share the same 165-ball FBGA footprint, pin functions differ significantly: CY7C1516V18 uses NWS[1:0], CY7C1527V18 uses BWS0 only, and CY7C1520V18 adds BWS[3:0]. Address width, DQ count, and burst control signals are not interchangeable across variants.