Infineon Technologies CY7C1315KV18-250BZXC

Overview

CY7C1315KV18-250BZXC from Cypress Semiconductor is a 18-Mbit QDR® II SRAM with 512K × 36 organization, 250 MHz maximum clock frequency, 1.8 V core supply, and 1.4–1.8 V I/O supply. It implements separate read/write ports with DDR interfaces, four-word burst architecture, and echo clocks (CQ/CQ) for high-speed data capture in networking and packet buffering applications.

For engineers reviewing the CY7C1315KV18-250BZXC datasheet, CY7C1315KV18-250BZXC pinout, CY7C1315KV18-250BZXC application, or CY7C1315KV18-250BZXC equivalent, key selection criteria include concurrent read/write bandwidth, 36-bit data width, FBGA-165 package compatibility, DOFF-controlled read latency mode, and HSTL-15/18 I/O support.

Technical Context

The device uses synchronous pipelined QDR II architecture with independent read and write ports sharing a multiplexed address bus. Address latching occurs on alternate rising edges of K/K clocks, enabling concurrent access without bus turnaround.

It supports dual-clock domain operation (K/K for address/control, C/C for output timing) and includes an on-chip PLL for precise data placement. Read latency is configurable: 1 cycle when DOFF = LOW (QDR I mode), 1.5 cycles when DOFF = HIGH (QDR II mode).

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm body height, RoHS-compliant, Pb-free option available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1315KV18-300BZXC, the -250BZXC trades 50 MHz bandwidth for relaxed timing closure and lower power; compared with AS7C3364B-250BIN, it delivers true dual-port concurrency and DDR throughput but requires more complex clock domain management.

Availability

CY7C1315KV18-250BZXC is available at Aetrix Electronics and suitable for packet buffering in network switches, line card memory in telecom routers, and baseband processing in 4G/LTE infrastructure requiring stable component supply across multi-year production cycles.

Supply support for CY7C1315KV18-250BZXC 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 networking, automotive, and industrial applications, with emphasis on signal integrity and timing precision.

The QDR® II SRAM product line targets high-speed data-path applications demanding deterministic latency, concurrent access, and scalable bandwidth - specifically engineered for switch fabric, baseband, and video processing subsystems.

FAQ

What is the function of the DOFF pin on CY7C1315KV18-250BZXC?

The DOFF (Data Output OFFset) pin configures read latency mode: when asserted HIGH, it enables QDR II mode with 1.5-cycle latency for optimized bandwidth and timing margin; when LOW, it reverts to QDR I mode with 1-cycle latency for backward compatibility. This setting is sampled synchronously on the K clock and affects all subsequent read operations until changed.

How does the CY7C1315KV18-250BZXC support byte-selectable writes?

It uses four active-low Byte Write Select signals (BWS[3:0]), each controlling one 9-bit byte group across the 36-bit D[35:0] bus. When a BWS signal is deasserted (HIGH), the corresponding 9-bit segment is ignored during the write cycle, preserving prior data in those bits. All BWS signals are sampled synchronously with D[35:0] on the rising edge of K/K.

Can CY7C1315KV18-250BZXC operate with only a single clock source?

No - the device requires two differential clock pairs: K/K for address/control input timing and C/C for output data timing. While K and C may be derived from the same source, they must be independently routed and phase-aligned per datasheet specifications to meet setup/hold requirements. Single-clock mode is not supported.

What is the purpose of the CQ and CQ pins?

CQ and CQ are echo clocks - buffered, output-synchronous copies of C and C - delivered with matched trace length and propagation delay to Q[35:0]. They allow external receivers (e.g., FPGAs) to latch read data using source-synchronous timing, eliminating board-level skew and enabling reliable capture at 250 MHz DDR rates without complex deskew circuitry.