Cypress Semiconductor Corp CY7C1911KV18-300BZXC

Overview

CY7C1911KV18-300BZXC from Cypress Semiconductor is a 18-Mbit QDR® II SRAM with 2M × 9 organization, 300 MHz maximum operating frequency, 1.8 V core supply, and 1.4–1.8 V I/O supply. It implements separate read/write ports, four-word burst architecture, and DDR interfaces on both ports for concurrent high-bandwidth memory access in network packet buffers and switch fabric controllers.

For engineers reviewing the CY7C1911KV18-300BZXC datasheet, CY7C1911KV18-300BZXC pinout, CY7C1911KV18-300BZXC application, or CY7C1911KV18-300BZXC equivalent, key selection criteria include its 300 MHz clock rating, DOFF-configurable 1-cycle/1.5-cycle read latency, echo clock (CQ/CQ) support for timing margin recovery, and 165-ball FBGA package compatibility with high-speed PCB layout constraints.

Technical Context

The device uses synchronous pipelined QDR II architecture with independent read and write data paths, eliminating bus turnaround overhead. Address latching occurs on alternate rising edges of K/K clocks, enabling full concurrency between read and write transactions without arbitration delay.

It integrates a PLL for precise data placement, HSTL-compatible variable-drive output buffers, and IEEE 1149.1 JTAG test access port. Read latency is configurable via DOFF pin: LOW yields 1-cycle latency (QDR I mode), HIGH yields 1.5-cycle latency (native QDR II mode) with guaranteed data coherency.

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 (BZXC suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3615L10BG and IS61WV102418B, CY7C1911KV18-300BZXC uniquely delivers 300 MHz DDR bandwidth with source-synchronous echo clocks and configurable latency - making it the only option capable of sustaining 10 Gbps packet buffering with sub-100 ns turnaround in compact switch ASIC interfaces.

Availability

CY7C1911KV18-300BZXC is available at Aetrix Electronics and suitable for network packet buffers, switch fabric controllers, telecom line cards, and high-speed test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY7C1911KV18-300BZXC 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.

CY7C1911KV18 belongs to Cypress's QDR II SRAM product line, engineered specifically for ultra-low-latency, concurrent-access memory subsystems in networking and telecommunications infrastructure where deterministic timing and burst efficiency are critical.

FAQ

What is the function of the DOFF pin on CY7C1911KV18-300BZXC?

The DOFF (Data Output OFFset) pin configures read latency mode: when asserted HIGH, it enables native QDR II operation with 1.5-cycle read latency and guaranteed data coherency; when LOW, it reverts to QDR I compatibility mode with 1-cycle latency. This pin is sampled synchronously on the K clock edge at power-up and remains latched until reset.

Can CY7C1911KV18-300BZXC operate with only a single clock domain?

Yes - the device supports single-clock-domain operation by tying K to C and K to C, though this sacrifices the skew-mitigation benefit of separate output clocks. In this mode, all inputs and outputs are referenced to the same K clock, and echo clocks (CQ/CQ) remain functional for data capture timing recovery at the receiver.

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

ZQ is the impedance calibration reference pin. It must be connected to a precision 240 Ω resistor tied to ground to enable on-die termination calibration of HSTL output drivers. Without this connection, output drive strength varies with process/voltage/temperature, risking signal integrity violations at 600 MT/s operation.

Does CY7C1911KV18-300BZXC support byte-level write masking?

No - unlike the ×8 and ×18 variants, CY7C1911KV18 (2M × 9) uses a single BWS0 pin to enable or disable the entire 9-bit word. It does not support partial-word writes; all nine bits are written or none are. Nibble write select (NWS) is not implemented in this configuration.