Infineon Technologies CY7C1263KV18-400BZXI

Overview

CY7C1263KV18 from Cypress Semiconductor is a 36-Mbit QDR® II+ SRAM with 2M × 18 organization, 400 MHz maximum clock frequency, 2.5-cycle read latency, and separate read/write DDR ports operating at 800 Mbps per pin. It delivers 14.4 Gbps aggregate bandwidth in high-speed networking and packet buffering applications.

For engineers reviewing the CY7C1263KV18 datasheet, CY7C1263KV18 pinout, CY7C1263KV18 application, or CY7C1263KV18 equivalent, key selection criteria include its 165-ball FBGA package, HSTL I/O compatibility, DOFF-controlled PLL mode switching, echo clock (CQ/CQ) timing support, and byte-write select (BWS0/BWS1) for partial-word writes.

Technical Context

The device implements a true dual-port synchronous architecture with independent read and write data paths-no bus turnaround required. Its four-word burst transfers occur over two K/K clock cycles, with address latching on alternating rising edges of K and K to enable concurrent access.

Internal PLL enables precise 2.5-cycle read latency when DOFF = HIGH; disabling PLL via DOFF = LOW reverts operation to QDR I mode (1-cycle latency, ≤167 MHz). Echo clocks CQ and CQ are phase-aligned free-running outputs synchronized to K and K, respectively, simplifying high-speed data capture.

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 QDR SRAM applications.

Compared with IDT72T36150, CY7C1263KV18 offers superior signal integrity via ZQ calibration and identical functional behavior at 400 MHz, while ISSI IS61WV102418B lacks the concurrency, timing precision, and bandwidth needed for QDR use cases.

Availability

CY7C1263KV18 is available at Aetrix Electronics and suitable for packet buffering, telecom line card memory, high-speed test equipment, and real-time video frame buffering requiring stable component supply and long-term lifecycle support.

Supply support for CY7C1263KV18 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.

This device belongs to Cypress's QDR II+ SRAM product line, engineered specifically for deterministic, high-bandwidth memory interfacing in packet-switched infrastructure where concurrent read/write throughput and sub-nanosecond timing alignment are critical.

FAQ

What is the function of the DOFF pin on CY7C1263KV18?

The DOFF pin controls the internal PLL: when pulled HIGH, the device operates in QDR II+ mode with 2.5-cycle read latency and up to 400 MHz clock rate; when pulled LOW, the PLL is disabled and it reverts to QDR I mode with 1-cycle latency and a maximum frequency of 167 MHz. This allows hardware-selectable latency/speed trade-offs without firmware changes.

How does the ZQ pin affect output driver behavior?

The ZQ pin sets output impedance for Q[17:0], CQ, and CQ signals by connecting an external resistor (RQ) from ZQ to ground; the device calibrates drivers to 0.2 × RQ. If tied directly to VDDQ, minimum impedance mode activates. ZQ must never be left floating or grounded, as that disables impedance tuning and risks signal integrity degradation.

Can CY7C1263KV18 perform partial-word writes without read-modify-write?

Yes - using BWS0 and BWS1 (active-LOW byte write selects), the device writes only D[8:0] or D[17:9] respectively, leaving unselected bytes unchanged. This eliminates the need for external logic or software overhead to preserve existing data in 18-bit words during incremental updates.

What timing role do CQ and CQ serve in system-level design?

CQ and CQ are echo clocks synchronized to K and K, respectively, and edge-aligned with valid Q[17:0] data. They provide a local, low-skew reference for FPGA or ASIC capture logic - enabling reliable DDR data sampling without complex deskew circuitry or board-level delay matching.