Infineon Technologies CY7C1315KV18-250BZIT

Overview

CY7C1315KV18-250BZIT from Cypress Semiconductor is a 512K × 36-bit, 18-Mbit QDR® II SRAM with four-word burst architecture, 250 MHz maximum operating frequency (40 ns clock period), 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 (500 Mbps per pin), echo clocks (CQ/CQ), and programmable impedance for high-speed memory subsystems in network packet buffers and baseband processors.

For engineers reviewing the CY7C1315KV18-250BZIT datasheet, CY7C1315KV18-250BZIT pinout, CY7C1315KV18-250BZIT application, or CY7C1315KV18-250BZIT equivalent, key selection criteria include concurrent read/write bandwidth, 1.5-cycle read latency (DOFF = HIGH), 165-ball FBGA package compatibility, and HSTL-15/18 I/O drive support in telecom and test equipment designs.

Technical Context

The CY7C1315KV18 implements QDR II architecture with fully independent read and write data paths-no bus turnaround required. Address latching occurs on alternating rising edges of K/K clocks, enabling true concurrent access to the same memory array via shared address bus.

It uses dual input clocks (K/K) for write control and dual output clocks (C/C) for read data timing, with echo clocks (CQ/CQ) aligned to output data edges to simplify capture at 500 Mbps. The device supports single-clock domain operation and includes a PLL for precise data placement relative to clock edges.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3615L10BG and IS61WV102436BLL-150BLI, CY7C1315KV18-250BZIT delivers 2.5× higher clock rate, true concurrent read/write capability, and echo clocks-making it uniquely suited for next-generation packet processing and real-time signal buffering where timing margin and bandwidth are critical.

Availability

CY7C1315KV18-250BZIT is available at Aetrix Electronics and suitable for network packet buffers, baseband signal processors, test equipment memory caches, and high-speed data acquisition systems requiring stable component supply across extended product lifecycles.

Supply support for CY7C1315KV18-250BZIT 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.

The QDR® II SRAM product line was designed specifically for ultra-high-bandwidth, low-latency memory subsystems in networking infrastructure, wireless base stations, and test instrumentation-prioritizing deterministic timing, concurrent access, and signal integrity at multi-Gbps rates.

FAQ

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

The DOFF (Data Output OFFset) pin selects read latency mode: when asserted HIGH, it configures 1.5-cycle read latency for optimized bandwidth; when LOW, it enables 1-cycle latency for minimal delay. This setting directly affects the number of clock cycles between address assertion and valid Q[35:0] output, and must be held stable during operation-no dynamic switching is supported.

How does the CY7C1315KV18-250BZIT handle partial writes?

Partial writes are controlled by the four Byte Write Select (BWS[3:0]) inputs, each active-low and corresponding to an 9-bit byte lane within the 36-bit D[35:0] bus. When a BWS signal is deasserted, its associated byte remains unaltered in memory-enabling efficient updates without read-modify-write cycles. All BWS signals are sampled synchronously with D[35:0] on the rising edge of K/K.

Can CY7C1315KV18-250BZIT operate with only one clock domain?

Yes-the device supports single-clock domain operation where K and C are tied together (and K and C likewise), eliminating need for separate clock nets. In this mode, the internal PLL remains active to maintain timing alignment, and echo clocks CQ/CQ still track output data edges. Full dual-clock functionality is retained when separate K/K and C/C nets are used for maximum timing flexibility.

What is the purpose of the NC/xxxM pins on the 165-ball FBGA package?

The NC/36M, NC/72M, NC/144M, and NC/288M pins are no-connect die pads-physically present on the package but not bonded to the silicon. They may be left floating, tied to VSS, or used as routing channels; Cypress explicitly states they "can be tied to any voltage level" with no electrical impact. These pins exist for package compatibility across the QDR II family and do not require termination or biasing.