Infineon Technologies CY7C1515KV18-250BZI

Overview

CY7C1515KV18 from Cypress Semiconductor is a 2M × 36, 72-Mbit QDR® II SRAM with four-word burst architecture, 250 MHz maximum operating frequency (400 Mbps per pin), 1.8 V core supply, and 1.4–1.8 V I/O supply. It features separate read/write ports, DDR interfaces on both ports, echo clocks (CQ/CQ), and PLL-based timing control for high-speed networking buffer applications.

For engineers reviewing the CY7C1515KV18 datasheet, CY7C1515KV18 pinout, CY7C1515KV18 application, or CY7C1515KV18 equivalent, key selection criteria include concurrent read/write bandwidth, 1.5-cycle read latency (DOFF = HIGH), FBGA-165 package compatibility, and HSTL-18 I/O drive compliance in packet forwarding systems.

Technical Context

This device implements true dual-port synchronous pipelined SRAM logic with independent K/K input clocks for address/data capture and C/C output clocks for data launch - enabling zero-bus-turnaround operation. Its QDR II architecture supports simultaneous read and write transactions to the same memory array without arbitration delay.

The internal 512K × 36 memory array is accessed via a multiplexed 19-bit address bus latched on alternating edges of K; four sequential 36-bit words burst per access. Echo clocks CQ/CQ align with Q[35:0] outputs to simplify source-synchronous capture at the controller under ±100 ps skew tolerance.

Key Specifications

Pinout & Package

Package: 165-ball fine-pitch ball grid array (FBGA), 13 × 15 × 1.4 mm, 0.8 mm pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1515KV18-250BZI, the -200BZI variant trades 20% bandwidth for reduced power and cost, while AS7C35128A-250BIN lacks QDR II's concurrent port architecture entirely - making it unsuitable for true full-duplex applications without significant system-level redesign.

Availability

CY7C1515KV18-250BZI is available at Aetrix Electronics and suitable for high-speed packet buffering, network switch fabric memory, and telecom baseband processing requiring stable component supply across extended product lifecycles.

Supply support for CY7C1515KV18-250BZI 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 fabless semiconductor company specializing in high-performance memory, microcontrollers, and connectivity solutions for industrial, automotive, and communications markets.

CY7C1515KV18 belongs to Cypress's QDR II SRAM product line, designed specifically for deterministic, low-latency, full-duplex memory access in packet-switched infrastructure where bus turnaround overhead must be eliminated.

FAQ

What is the function of the DOFF pin on CY7C1515KV18?

The DOFF (Data Output OFF) pin configures read latency mode: when asserted HIGH, it enables 1.5-cycle read latency for optimal timing margin in high-speed systems; when LOW, it reduces latency to 1 cycle at the cost of tighter setup/hold windows. This setting is sampled synchronously on the K clock rising edge and affects all subsequent read operations until changed.

Can CY7C1515KV18 operate with only a single clock signal?

Yes - the device supports single-clock-domain operation using only the K clock for both input capture and output launch (with C tied to K). However, this forfeits echo clock deskewing capability and reduces maximum reliable data rate due to increased flight-time mismatch sensitivity; dual-clock mode (K/K + C/C) is required for 500 Mbps/pin operation per the datasheet AC specifications.

How does byte write select (BWS) work for 36-bit data width?

BWS[3:0] provides independent control over four 9-bit byte lanes: BWS0 enables D[8:0], BWS1 enables D[17:9], BWS2 enables D[26:18], and BWS3 enables D[35:27]. All BWS signals are sampled synchronously with data on the K clock rising edge; deasserting any BWS leaves the corresponding 9-bit segment unmodified during the write cycle.

Is the ZQ pin required for normal operation?

Yes - the ZQ pin connects to a 240 Ω external resistor to VSS for on-die impedance calibration. Without this connection, HSTL-18 output drivers cannot achieve specified 50 Ω termination accuracy, leading to signal integrity degradation, especially above 300 Mbps/pin. Calibration occurs automatically at power-up and can be retriggered via JTAG.