Infineon Technologies CY7C2168KV18-550BZC

Overview

CY7C2168KV18 from Cypress Semiconductor is a 18-Mbit (1M × 18) synchronous pipelined DDR II+ SRAM with two-word burst architecture, 2.5-cycle read latency (when DOFF = HIGH), 550 MHz clock operation, and on-die termination (ODT) for D[x:0], BWS[x:0], and K/K inputs. It delivers 1100 MT/s data throughput via double-data-rate I/O and supports HSTL I/O with VDDQ = 1.4 V to 1.8 V, targeting high-bandwidth buffering in network packet processors and baseband subsystems.

For engineers reviewing the CY7C2168KV18 datasheet, CY7C2168KV18 pinout, CY7C2168KV18 application, or CY7C2168KV18 equivalent, key selection considerations include its 2.5-cycle vs. 1-cycle configurable read latency, echo-clock–synchronized QVLD timing, ODT impedance range selection via ODT pin, and FBGA-165 package compatibility with high-speed PCB routing constraints.

Technical Context

This SRAM implements a synchronous pipelined architecture where all address, control, and data signals are registered on rising edges of complementary clocks K and K. Read operations initiate on K's rising edge, with first data valid 2.5 cycles later-aligned to both K and K-and second word output on the subsequent K edge.

The device integrates a PLL for precise data placement, echo clocks (CQ/CQ) phase-matched to K/K for simplified system-level data capture, and a ZQ-calibrated output driver network enabling 0.2 × RQ impedance tuning. ODT is programmable at power-up via the ODT pin to select low-range (RQ/3.33) or high-range (RQ/1.66) termination for inputs.

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 non-Pb-free construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3652 and IS61WV102418B, CY7C2168KV18 uniquely combines DDR II+ burst efficiency, on-die termination, and echo-clock–assisted timing-reducing system-level design risk in high-frequency packet and signal processing applications.

Availability

CY7C2168KV18 is available at Aetrix Electronics and suitable for network packet buffering, baseband signal processing, and high-performance test equipment requiring stable component supply, long-lifecycle support, and guaranteed Pb-free transition path.

Supply support for CY7C2168KV18 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, with emphasis on signal integrity and system-level integration.

CY7C2168KV18 belongs to Cypress's QDR II+/DDR II+ SRAM product line, engineered specifically for deterministic, low-latency, high-throughput buffering in FPGA- and ASIC-based communications infrastructure.

FAQ

What is the function of the DOFF pin on CY7C2168KV18?

The DOFF (Double-Off) pin configures read latency mode: when asserted HIGH, it enables DDR II+ operation with 2.5-cycle latency; when LOW, it reverts to DDR I–compatible 1-cycle latency. This pin is sampled only at power-up and remains latched, allowing system-level optimization for either throughput (2.5-cycle) or minimal delay (1-cycle) without runtime reconfiguration.

How does the ZQ pin calibrate output impedance?

The ZQ pin connects to an external precision resistor (RQ) tied to ground. During initialization, the device measures RQ and sets its output driver and ODT impedance to exactly 0.2 × RQ. For example, a 200 Ω RQ yields 40 Ω output impedance. Direct connection to VDDQ enables minimum impedance mode; floating or grounding ZQ is prohibited and may cause undefined behavior.

Can CY7C2168KV18 operate with only one clock (K) instead of K and K?

No. The CY7C2168KV18 requires both complementary clocks K and K for correct DDR operation. K initiates all transactions and registers address/control signals, while both K and K register write data and drive read data. Omitting K violates timing specifications and prevents functional operation-no single-ended clock workaround exists in the architecture.

What is the purpose of the QVLD signal, and how is it timed?

QVLD (Valid Output Indicator) is a synchronous output that asserts precisely when DQ[17:0] carries valid read data. It is edge-aligned to both CQ and CQ echo clocks-not to K/K-ensuring zero-skew indication across all data bits. This eliminates timing margin uncertainty in FPGA capture logic and replaces manual delay-chain calibration with a hardware-synchronized validity flag.