Infineon Technologies CY7C1315KV18-250BZCT

Overview

CY7C1315KV18-250BZCT from Cypress Semiconductor is a 512K × 36-bit, 18-Mbit QDR® II SRAM with four-word burst architecture, 250 MHz maximum clock frequency (40 ns cycle time), 1.8 V core supply, and 1.4–1.8 V I/O supply. It delivers concurrent read/write operations via independent ports and supports DDR data transfers at up to 500 Mbps per pin using echo clocks CQ/CQ and separate K/K and C/C timing domains. Used in high-bandwidth packet buffering for network switches and routers.

For engineers reviewing the CY7C1315KV18-250BZCT datasheet, CY7C1315KV18-250BZCT pinout, CY7C1315KV18-250BZCT application, or CY7C1315KV18-250BZCT equivalent, key selection criteria include 36-bit wide synchronous burst interface, DOFF-controlled 1-cycle vs. 1.5-cycle read latency, BWS[3:0] byte write select granularity, and 165-ball FBGA (13 × 15 × 1.4 mm) package compatibility with high-speed PCB layout constraints.

Technical Context

This QDR II SRAM implements fully pipelined, synchronous read and write ports sharing a single multiplexed address bus latched on alternating rising edges of the K clock. Internal self-timed writes ensure deterministic write completion without external handshake.

The device uses dual input clocks (K/K) for address/data capture and dual output clocks (C/C) with echo clocks (CQ/CQ) to align data valid windows precisely at the receiver-critical for >500 Mbps DDR signaling integrity. DOFF pin selects between 1-cycle (LOW) and 1.5-cycle (HIGH) read latency modes, enabling system-level timing optimization.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm body, 0.8 mm ball pitch, RoHS-compliant Pb-free finish (BZCT suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3615L10PA and IS61WV102436BLL-15BLI, CY7C1315KV18-250BZCT uniquely delivers 250 MHz operation with echo-clock–assisted DDR timing, making it the only option supporting deterministic sub-40 ns read latency in 10G+ packet processing pipelines.

Availability

CY7C1315KV18-250BZCT is available at Aetrix Electronics and suitable for network switching, telecom line card design, high-speed test instrumentation, and defense radar signal processing requiring stable component supply across extended product lifecycles.

Supply support for CY7C1315KV18-250BZCT 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.

CY7C1315KV18 belongs to the QDR® II SRAM product line, engineered specifically for deterministic, high-bandwidth buffering in packet-switched infrastructure where concurrent access and sub-cycle latency control are mandatory.

FAQ

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

The DOFF (Data Output OFFset) pin selects read latency mode: when asserted HIGH, it configures 1.5-cycle latency for improved timing margin in high-speed systems; when LOW, it enables 1-cycle latency for minimal pipeline delay. This setting directly affects the number of K-clock cycles between address assertion and valid Q[35:0] output, and is sampled synchronously on the K clock edge.

How does the BWS[3:0] signal operate during a write transaction?

BWS[3:0] are active-low byte write enables controlling four independent 9-bit lanes of D[35:0]. When a BWS bit is LOW, its corresponding 9-bit byte is written; when HIGH, that byte remains unaltered. All BWS signals are sampled on the same K-clock edge as D[35:0], enabling true partial writes without read-modify-write cycles or external masking logic.

Can CY7C1315KV18-250BZCT operate with only a single clock domain?

Yes-though optimized for dual-clock (K/K and C/C) operation, the device supports single-clock mode by tying K to C and K to C. In this configuration, read data is registered on the same clock used for address and write data capture, reducing PCB routing complexity at the cost of reduced timing margin and loss of echo clock benefits for data capture.

What is the purpose of the CQ and CQ pins?

CQ and CQ are echo clocks-output-aligned copies of the C and C clocks-driven simultaneously with Q[35:0] data. They provide a source-synchronous strobe at the receiver, eliminating flight-time mismatch between clock and data paths. This simplifies setup/hold timing closure in FPGA or ASIC receivers operating above 500 Mbps per pin.