Infineon Technologies CY7C1512V18-250BZXC

Overview

CY7C1512V18 from Cypress Semiconductor is a 4M × 18-bit (72-Mbit), 1.8V QDR-II SRAM with separate read/write ports, 250 MHz clock operation, DDR interfaces on both ports (500 MHz data rate), and 165-ball FBGA package. It delivers concurrent high-bandwidth memory access for network packet buffering in telecom line cards.

For engineers reviewing the CY7C1512V18 datasheet, CY7C1512V18 pinout, CY7C1512V18 application, or CY7C1512V18 equivalent, key selection criteria include burst depth (2-word), I/O voltage (VDDQ = 1.4–1.8 V), echo clock support (CQ/CQ), HSTL-compatible outputs, and JTAG 1149.1 test access.

Technical Context

The CY7C1512V18 implements QDR-II architecture with fully independent synchronous read and write ports sharing a multiplexed 21-bit address bus. Each port uses dedicated DDR clock pairs: K/K for input timing and C/C for output timing, enabling simultaneous 18-bit read and write transfers per cycle.

It integrates a Delay Lock Loop (DLL) for precise data placement, supports variable-drive HSTL I/O, and includes byte write selects (BWS[1:0]) for partial-word writes. Internal self-timed write circuitry ensures deterministic write latency without external handshake.

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, RoHS-compliant Pb-free option available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3615L10BG and IS61WV102418B, the CY7C1512V18 uniquely delivers 250 MHz DDR dual-port operation with echo clocks and DLL support - essential for new 10G+ networking designs requiring deterministic timing and zero-turnaround bandwidth.

Availability

CY7C1512V18 is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, switch fabric lookup tables, and FPGA co-processor cache applications requiring stable component supply and long-term industrial availability.

Supply support for CY7C1512V18 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.

The QDR-II SRAM product line was developed specifically for high-bandwidth, low-latency memory subsystems in carrier-grade networking equipment - emphasizing concurrent access, source-synchronous timing, and robust signal integrity at multi-Gbps rates.

FAQ

What is the function of the ZQ pin on CY7C1512V18?

The ZQ pin calibrates the output driver impedance of Q[17:0] and echo clocks CQ/CQ to match the system's data bus characteristic impedance. It must be connected to a precision 50 Ω resistor to ground (setting output impedance to 10 Ω) or directly to VDDQ for minimum impedance mode. Leaving it floating or tying to GND violates electrical specifications and causes signal integrity failure.

Can CY7C1512V18 operate with only a single clock domain?

Yes - the device supports single-clock mode where K/K serve as both input and output clocks. In this configuration, C/C are unused, and data is driven on K/K edges. However, echo clock functionality (CQ/CQ) and optimal skew compensation are lost, reducing maximum reliable operating frequency and increasing timing margin requirements on the PCB.

How does the BWS[1:0] signal work for partial writes?

BWS[1:0] controls two independent 9-bit write lanes: BWS0 enables D[8:0], BWS1 enables D[17:9]. When either is deasserted (high), the corresponding 9-bit segment remains unaltered. This enables atomic 9-bit updates without read-modify-write cycles - critical for maintaining consistency in multi-field packet header modifications.

Is DOFF pin required to be tied high in normal operation?

Yes - DOFF must be held high (VDDQ) during normal operation to enable the internal Delay Lock Loop. Pulling DOFF low disables the DLL, causing output timing to shift significantly (±1 ns skew), violating AC timing specs in the datasheet. Only use DOFF = low for specific characterization or legacy system compatibility testing.