Infineon Technologies CY7C1663KV18-450BZXC

Overview

CY7C1663KV18 from Cypress Semiconductor is a 144-Mbit QDR® II+ SRAM with 8 M × 18 organization, 550-MHz clock support, 2.5-cycle read latency, and separate read/write DDR ports. It delivers 1100-MHz data transfer rates on both ports, uses HSTL I/O with 1.8-V core/1.4–1.8-V I/O supply, and is packaged in a 165-ball FBGA (15 × 17 × 1.4 mm). It serves as high-bandwidth buffer memory in network packet processors and switch fabric controllers.

For engineers reviewing the CY7C1663KV18 datasheet, CY7C1663KV18 pinout, CY7C1663KV18 application, or CY7C1663KV18 equivalent, key selection criteria include its four-word burst architecture, echo clock (CQ/CQ) timing support, QVLD data validity signaling, DOFF-configurable PLL mode (QDR II+ vs QDR I), and depth expansion via RPS/WPS port selects.

Technical Context

The CY7C1663KV18 implements a true dual-port synchronous SRAM architecture with physically independent read and write data paths-no bus turnaround required. Its QDR II+ operation relies on two input clocks (K and K), both rising-edge-triggered, to latch address/data and drive outputs, enabling concurrent read/write transactions at full bandwidth.

It integrates an internal PLL for precise data placement and supports programmable output impedance via ZQ calibration. The device operates in two latency modes: 2.5-cycle read latency with DOFF = HIGH (QDR II+ mode), or 1-cycle latency with DOFF = LOW (QDR I mode, ≤167 MHz), confirmed by functional description and timing tables in Rev. *M datasheet.

Key Specifications

Pinout & Package

Package: 165-ball fine-pitch ball grid array (FBGA), 15 mm × 17 mm × 1.4 mm body, RoHS-compliant, Pb-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3615L10PF and IS61WV102418B, the CY7C1663KV18 uniquely combines configurable latency (via DOFF), on-die impedance tuning (ZQ), and guaranteed 2.5-cycle read timing at 550 MHz - making it optimal for systems requiring both high throughput and flexible timing adaptation.

Availability

CY7C1663KV18 is available at Aetrix Electronics and suitable for network packet buffering, switch fabric controller memory, telecom baseband processing, and high-speed test equipment requiring stable component supply and long-term production continuity.

Supply support for CY7C1663KV18 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 communications, industrial, and automotive markets.

The QDR® II+ SRAM product line targets high-speed networking infrastructure, delivering deterministic latency, concurrent dual-port access, and robust signal integrity for packet-forwarding and real-time signal processing systems.

FAQ

What is the function of the DOFF pin on CY7C1663KV18?

The DOFF (PLL Disable) pin is an active-low control that disables the internal PLL when pulled low. In this state, the device operates in QDR I mode with 1-cycle read latency and a maximum clock frequency of 167 MHz. When DOFF is high, the PLL is enabled and the device runs in QDR II+ mode at up to 550 MHz with 2.5-cycle latency. This hardware-selectable mode provides design flexibility for timing-critical or power-constrained use cases.

How does the ZQ pin affect signal integrity?

The ZQ pin connects to an external precision resistor (typically 240 Ω) tied to ground, enabling automatic calibration of the output driver impedance for Q[17:0], CQ, and CQ signals. This calibration sets output impedance to 0.2 × RQ (e.g., ~48 Ω), matching common PCB trace impedances and minimizing reflections. Leaving ZQ unconnected or tying it to GND violates specifications and risks signal integrity degradation at 550 MHz.

Can CY7C1663KV18 perform simultaneous read and write to the same address?

Yes - the CY7C1663KV18 supports fully independent read and write operations to the same memory location due to its physically separate read/write data paths and pipelined architecture. However, the result depends on relative timing: if a write completes before the corresponding read burst begins, the read returns updated data; if not, it returns pre-write data. System-level arbitration must ensure coherency for critical shared-address usage.

What is the role of QVLD in system timing design?

QVLD is a synchronous output asserted edge-aligned with CQ and CQ, indicating that Q[17:0] data is valid and stable. Unlike simple clock-enable schemes, QVLD provides explicit, cycle-accurate validity signaling - eliminating need for fixed delay assumptions in FPGA/ASIC capture logic. This allows robust data sampling even under PVT variation, and is essential for achieving reliable 1100-MT/s operation without excessive timing margin.