Cypress Semiconductor Corp CY7C1512KV18-350BZC

Overview

CY7C1512KV18 from Cypress Semiconductor is a 4M × 18-bit (72-Mbit), 350 MHz QDR® II SRAM with independent read/write DDR ports, 1.8V core supply, and 1.4–1.8V I/O supply, used in high-bandwidth packet buffering for network switches and routers.

For engineers reviewing the CY7C1512KV18 datasheet, CY7C1512KV18 pinout, CY7C1512KV18 application, or CY7C1512KV18 equivalent, key selection criteria include burst timing compliance, echo clock (CQ/CQ) capture support, DOFF-configurable read latency (1.5-cycle vs. 1-cycle), and FBGA-165 package thermal/mechanical constraints.

Technical Context

This QDR II SRAM implements fully synchronous pipelined operation with separate K/K clocks for write/read address latching and C/C clocks for output data registration. It uses rising-edge-only clocking on all inputs and supports concurrent read/write transactions without bus turnaround.

The device integrates a PLL for precise data placement, JTAG 1149.1 boundary scan for testability, and programmable impedance control via ZQ pin. Read latency is configurable via DOFF: HIGH enables 1.5-cycle latency; LOW reverts to 1-cycle latency compatible with QDR I systems.

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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C36256P-20TIN and IS61WV102418BLL-10BLI, CY7C1512KV18 uniquely delivers true concurrent 700 MT/s read+write bandwidth with source-synchronous echo clocks-critical for deterministic real-time packet processing where bus turnaround or external arbitration would violate timing budgets.

Availability

CY7C1512KV18 is available at Aetrix Electronics and suitable for network switch fabric design, telecom line card development, and high-speed test equipment requiring stable component supply and long-term obsolescence management.

Supply support for CY7C1512KV18 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.

CY7C1512KV18 belongs to the QDR II SRAM product line, designed specifically for ultra-low-latency, high-bandwidth buffering in packet-switched infrastructure where deterministic timing and concurrent access are mandatory.

FAQ

What is the function of the DOFF pin on CY7C1512KV18?

The DOFF (Data Output OFFset) pin configures read latency mode: when asserted HIGH, it enables 1.5-cycle latency (native QDR II operation); when LOW, it selects 1-cycle latency for backward compatibility with QDR I systems. This setting directly impacts minimum read-to-read timing and must be fixed at power-up based on system clocking architecture.

How does the CQ/CQ echo clock improve system timing margin?

CQ and CQ are source-synchronous output clocks driven with the same delay as Q[17:0] data signals. They allow the receiving device (e.g., FPGA) to latch data using a clock edge aligned to data valid window, eliminating flight-time skew between clock and data nets. This reduces required setup/hold margins by up to 300 ps compared to system-synchronous clocking.

Can CY7C1512KV18 operate with only one clock domain (K = C)?

Yes - the device supports single-clock-domain operation where K and C are tied together. In this mode, all inputs and outputs are referenced to the same clock, simplifying clock distribution but sacrificing the skew-reduction benefit of separate read/write clocks and echo clocks. Timing parameters shift to reflect unified clock constraints per datasheet Table 10.

What is the role of the ZQ pin and how must it be connected?

ZQ is the impedance calibration reference terminal. It must be connected to a precision 240 Ω resistor to ground to enable on-die termination calibration of HSTL Class I output drivers. Without this connection, output drive strength varies with process/voltage/temperature, risking signal integrity violations above 400 MT/s.