Infineon Technologies CY7C1143KV18-400BZC

Overview

CY7C1143KV18 from Cypress Semiconductor is a 1M × 18, 18-Mbit QDR® II+ SRAM with separate read/write ports, 400 MHz operation (900 Mbps DDR data rate), 2.0-cycle read latency, and 165-ball FBGA (13 × 15 × 1.4 mm) package. It delivers full data coherency and supports concurrent read/write transactions in high-bandwidth networking packet buffers and telecom line cards.

For engineers reviewing the CY7C1143KV18 datasheet, CY7C1143KV18 pinout, CY7C1143KV18 application, or CY7C1143KV18 equivalent, key selection criteria include its 4-word burst architecture, HSTL I/O compatibility (VDDQ = 1.4–1.8 V), echo clock (CQ/CQ) timing support, and DOFF-controlled PLL mode selection between QDR II+ (2-cycle latency) and QDR I (1-cycle latency).

Technical Context

The device implements a synchronous pipelined QDR II+ architecture with independent read and write ports sharing a multiplexed address bus. Address latching occurs on alternate rising edges of K and K clocks, enabling true concurrent access without bus turnaround.

It integrates a phase-locked loop (PLL) for precise data placement and uses echo clocks (CQ/CQ) aligned to K/K to simplify high-speed data capture. The QVLD signal provides edge-aligned valid-data indication, and programmable output impedance via ZQ pin enables system-level termination matching.

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 IDT72T3615L10PA and IS61WV102418BLL-10BLI, CY7C1143KV18 uniquely delivers 400 MHz DDR bandwidth with hardware-supported timing aids (QVLD, CQ/CQ, ZQ), making it the only option capable of sustaining line-rate packet buffering in 10G+ infrastructure without FPGA-based timing compensation.

Availability

CY7C1143KV18 is available at Aetrix Electronics and suitable for 10G Ethernet switch ASICs, 4G/5G baseband units, optical transport network line cards, and broadcast video encoders requiring stable component supply and long-term industrial lifecycle support.

Supply support for CY7C1143KV18 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.

The QDR® II+ SRAM product line was designed specifically for deterministic, high-bandwidth buffering in packet-switched networks and baseband processing - emphasizing concurrent access, precise timing control, and system-level signal integrity.

FAQ

What is the function of the DOFF pin, and how does it affect timing behavior?

The DOFF (PLL Turn Off) pin is an active-low input that disables the internal PLL. When asserted LOW, the device operates in QDR I mode with 1-cycle read latency and maximum frequency reduced to 167 MHz. When HIGH (or pulled up), the PLL is enabled and the device runs in QDR II+ mode at up to 400 MHz with 2-cycle latency. This pin allows hardware-selectable timing modes without firmware changes.

How do the CQ and CQ echo clocks differ from the main K and K clocks?

CQ and CQ are free-running, source-synchronous echo clocks derived from K and K respectively. They are edge-aligned to their corresponding input clocks but have zero skew relative to Q[17:0] output transitions. Unlike K/K, which are system-generated and may suffer routing skew, CQ/CQ travel alongside data and provide a reliable strobe for capturing valid Q[17:0] values at the receiver - critical for reliable 400 MHz DDR operation.

Can CY7C1143KV18 operate with VDDQ = 1.5 V while VDD = 1.8 V?

Yes. The device explicitly supports VDDQ = 1.4 V to VDD (1.8 V), including 1.5 V operation. This allows interoperability with 1.5 V HSTL-compatible FPGAs and ASICs while maintaining 1.8 V core logic stability. The HSTL output drivers are designed for this voltage range, and DC electrical characteristics (e.g., VIH/VIL thresholds) are guaranteed across the full 1.4–1.8 V VDDQ window.

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

ZQ is an impedance calibration input used to tune the output drive strength of Q[17:0], CQ, and CQ pins. It must be connected to a precision resistor (typically 50 Ω or 75 Ω) tied to ground - not left floating or connected directly to GND/VDDQ. The device measures this resistance and configures its output buffers to deliver 0.2 × RQ drive strength, enabling accurate on-die termination matching to PCB trace impedance without external series resistors.