Infineon Technologies CY7C1318BV18-278BZC

Overview

CY7C1318BV18 from Cypress Semiconductor is a 18-Mbit synchronous pipelined DDR-II SRAM configured as 1M × 18, operating at 300 MHz with double-data-rate transfers at 600 MHz, featuring dual input clocks (K/K) and echo clocks (CQ/CQ) for precise timing alignment in high-speed memory subsystems used in network packet buffers and telecom line cards.

For engineers reviewing the CY7C1318BV18 datasheet, CY7C1318BV18 pinout, CY7C1318BV18 application, or CY7C1318BV18 equivalent, key selection criteria include its 1.8V core supply, HSTL I/O compatibility, 2-word burst architecture, DLL-based data placement accuracy, and 165-ball FBGA package footprint-critical for DDR memory interface design and signal integrity validation.

Technical Context

The CY7C1318BV18 implements a synchronous pipelined architecture with internal burst counter driven by A0, delivering two sequential 18-bit words per access. All address, control, and data inputs are registered on rising edges of K and K clocks, enabling deterministic setup/hold timing.

Read data is output-synchronized to C and C clocks, with echo clocks CQ and CQ referenced to C and C respectively-eliminating board-level skew compensation. The integrated Delay Lock Loop (DLL) aligns output data edges to echo clock transitions with ±50 ps jitter tolerance at 300 MHz.

Key Specifications

Pinout & Package

165-ball FBGA (13 × 15 × 1.4 mm, 0.8 mm pitch) with 18-bit bidirectional data bus (DQ[17:0]), dual differential clock pairs (K/K, C/C), echo clocks (CQ/CQ), load (LD), read/write (R/W), byte write selects (BWS[1:0]), address (A[19:0] with A0 driving burst counter), ZQ impedance calibration, DOFF for DLL disable, and dedicated power/ground balls (VDD, VDDQ, VSS).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1318BV18-250BZC, the -278BZC delivers 20% higher bandwidth and tighter DLL jitter specs critical for 10 GbE systems; versus AS7C3256B-20JIN, it offers lower voltage, superior burst efficiency, and native DDR-II timing-but lacks QDR's concurrent access capability.

Availability

CY7C1318BV18-278BZC is available at Aetrix Electronics and suitable for network packet buffers, telecom line cards, baseband processing caches, and industrial real-time controllers requiring stable component supply with long-term lifecycle assurance.

Supply support for CY7C1318BV18-278BZC 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 applications, with headquarters in San Jose, CA.

The CY7C13xxBV18 family targets high-speed networking and telecom infrastructure, delivering DDR-II SRAMs optimized for deterministic latency, signal integrity, and thermal efficiency in dense, fanless line card environments.

FAQ

What is the function of the ZQ pin on CY7C1318BV18-278BZC?

The ZQ pin connects to an external 240 Ω resistor to ground to calibrate the output driver impedance of DQ[17:0], CQ, and CQ pins to 48 Ω (0.2 × RQ). This ensures consistent signal integrity across voltage and temperature variations. It must never be left floating or tied directly to GND or VDDQ.

Can CY7C1318BV18-278BZC operate in single-clock mode?

Yes-when only K and K are supplied and C/C are unconnected, the device uses K/K to clock both input latching and output data. In this mode, CQ/CQ are generated relative to K/K, maintaining source-synchronous timing without requiring separate output clocks.

How does the burst counter work in CY7C1318BV18-278BZC?

The burst counter uses A0 as its LSB and increments linearly across two consecutive 18-bit words per access. Unlike x8/x9 variants, it does not start at zero internally-A0 determines whether the burst begins at even or odd word boundaries, enabling flexible address mapping in 1M × 18 space.

Is the DOFF pin required for normal operation?

No-DOFF is optional. When left unconnected or pulled HIGH, the internal DLL remains active for optimal data-to-CQ timing alignment. Pulling DOFF LOW disables the DLL, reverting to fixed-delay output timing with increased jitter; this mode is only recommended for debug or specific legacy timing compliance.