Cypress Semiconductor Corp CY7C1518KV18-250BZXC

Overview

CY7C1518KV18-250BZXC from Cypress Semiconductor is a 72-Mbit (4M × 18) synchronous DDR-II SRAM with two-word burst architecture, 250 MHz maximum operating frequency, 1.8 V core supply, and HSTL I/O compatible with 1.5 V or 1.8 V IO supply. It delivers 900 MB/s peak bandwidth via double-data-rate transfers at 500 Mbps per pin and supports precise timing control using dual K/K input clocks and dual C/C output clocks for skew management in high-speed memory subsystems used in network packet buffers and baseband processing.

For engineers reviewing the CY7C1518KV18-250BZXC datasheet, CY7C1518KV18-250BZXC pinout, CY7C1518KV18-250BZXC application, or CY7C1518KV18-250BZXC equivalent, key selection considerations include its 1.5-cycle read latency (DOFF = HIGH), echo clock support (CQ/CQ), JTAG 1149.1 test access port, PLL-based data placement accuracy, and 165-ball FBGA package with 13 × 15 × 1.4 mm footprint.

Technical Context

The device implements a synchronous pipelined architecture with internal burst counter driven by A0, latching addresses on alternate rising edges of K and K clocks. Write data is registered on both K and K edges, while read data is driven on rising edges of C and C - enabling deterministic 1.5-cycle latency when DOFF is HIGH or 1-cycle latency when DOFF is LOW.

It integrates echo clocks (CQ/CQ) synchronized to C/C for simplified system-level data capture, uses ZQ for programmable output impedance matching (0.2 × RQ), and features variable-drive HSTL outputs supporting expanded voltage range (1.4 V–VDD). All synchronous inputs pass through registers clocked by K/K; all outputs are registered to C/C (or K/K in single-clock 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, with exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C34098B-250BIN and IS61WV102418BLL-250BLI, the CY7C1518KV18-250BZXC uniquely combines DDR-II timing, echo clock support, and programmable impedance in a 72-Mbit density - making it irreplaceable in new high-speed synchronous buffer designs requiring deterministic latency and simplified system-level timing.

Availability

CY7C1518KV18-250BZXC is available at Aetrix Electronics and suitable for network packet buffering, baseband signal processing, and industrial motion control requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for CY7C1518KV18-250BZXC 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) is a fabless semiconductor company specializing in high-performance memory, microcontrollers, and connectivity solutions for industrial, automotive, and communications markets.

The CY7C1518KV18 belongs to Cypress's DDR-II synchronous SRAM product line, engineered specifically for high-bandwidth, low-latency buffering in networking ASICs, FPGA-based accelerators, and real-time signal processing systems demanding precise clock-aligned data flow.

FAQ

What is the function of the DOFF pin on CY7C1518KV18-250BZXC?

The DOFF (Data Output OFFset) pin selects read latency mode: when asserted HIGH, it enables DDR-II operation with 1.5-cycle latency; when LOW, it configures the device for DDR-I mode with 1-cycle latency. This setting directly affects controller timing parameters and must be fixed during power-up; it is not dynamically switchable during operation.

Can CY7C1518KV18-250BZXC operate with only one clock (K) instead of differential K/K?

Yes - the device supports single-clock mode where K is used as the sole input clock and K is tied to VSS or left unconnected. In this mode, read data is driven on rising edges of K and K (i.e., same edge), and echo clocks CQ/CQ are generated relative to K. However, differential K/K is required to achieve full 250 MHz performance and minimize jitter-induced timing margin loss.

How does the ZQ pin calibrate output impedance?

The ZQ pin connects to an external precision resistor (typically 240 Ω) to ground, enabling on-die calibration that sets output driver impedance to 0.2 × RQ (e.g., 48 Ω). This matches standard PCB trace impedances without external termination resistors. Connecting ZQ directly to VDDQ enables minimum-impedance mode (~24 Ω), while floating or grounding ZQ is prohibited and may cause undefined behavior.

Is CY7C1518KV18-250BZXC pin-compatible with CY7C1518KV18-300BZXC?

Yes - both variants share identical 165-ball FBGA package (BZXC suffix), pinout, and electrical interface. The only difference is maximum rated clock frequency: 250 MHz vs. 300 MHz. A design validated for 250 MHz operation can use the -300BZXC part without hardware change, but the reverse is not guaranteed due to timing margin constraints at higher frequencies.