Cypress Semiconductor Corp CY7C1143KV18-400BZI

Overview

CY7C1143KV18 from Cypress Semiconductor is a 1M × 18, 18-Mbit QDR® II+ SRAM with four-word burst architecture, 2.0-cycle read latency, and DDR interfaces on independent read/write ports. It operates at 400 MHz (2.0 ns cycle time), supports 1.8 V core supply and 1.4–1.8 V I/O (VDDQ), and delivers 900 MT/s data throughput via HSTL I/O in a 165-ball FBGA package. Used in high-speed networking line cards for packet buffering.

For engineers reviewing the CY7C1143KV18 datasheet, CY7C1143KV18 pinout, CY7C1143KV18 application, or CY7C1143KV18 equivalent, key selection criteria include its 2.0-cycle latency mode (DOFF = HIGH), echo clock timing (CQ/CQ), QVLD validity signaling, and depth expansion support via RPS/WPS port selects.

Technical Context

The CY7C1143KV18 implements a synchronous pipelined QDR II+ architecture with physically separate read and write data paths-eliminating bus turnaround-and uses dual input clocks (K/K) to latch address/data on alternating rising edges. Its internal 256K × 18 array quad-bank organization enables concurrent access while maintaining full data coherency.

It integrates a PLL for precise DDR data placement, supports programmable output impedance via ZQ calibration, and provides JTAG 1149.1 boundary scan. The DOFF pin toggles between QDR II+ (2-cycle latency, up to 450 MHz) and QDR I (1-cycle latency, ≤167 MHz) operation modes.

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 high-speed burst SRAM applications.

Compared with IDT72T3615L10BG and IS61WV102418B, CY7C1143KV18 uniquely delivers 400 MHz DDR throughput with echo-clock–assisted capture and true dual-port concurrency-enabling line-rate packet processing where timing margin and bandwidth are critical.

Availability

CY7C1143KV18 is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, baseband processing cache, and ATE pattern memory requiring stable component supply and long-term industrial availability.

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) designs high-performance memory and programmable solutions for networking, automotive, and industrial applications.

The QDR® II+ SRAM product line targets ultra-low-latency, high-throughput data buffering in switch fabric, packet processing, and baseband subsystems where deterministic timing and concurrent access are mandatory.

FAQ

What is the function of the DOFF pin?

The DOFF pin controls the internal PLL: when HIGH, the device operates in QDR II+ mode with 2.0-cycle read latency and up to 450 MHz clock support; when LOW, the PLL is disabled and the device reverts to QDR I mode with 1-cycle latency and maximum 167 MHz operation. This allows backward compatibility and simplified timing validation across speed grades.

How does the QVLD signal improve system timing reliability?

QVLD is edge-aligned with CQ and CQ and asserts precisely on the rising edge corresponding to the first valid word in the four-word burst. This eliminates ambiguity in data-valid detection, enabling synchronous capture logic in FPGAs to avoid metastability and simplify timing closure-especially critical at 400 MHz where setup/hold margins are tight.

Can CY7C1143KV18 be used with 1.5 V I/O voltage?

Yes. The device supports VDDQ from 1.4 V to 1.8 V, explicitly including 1.5 V operation. HSTL Class I input thresholds and variable-drive output buffers are designed for interoperability with 1.5 V FPGA I/O banks, provided VDDQ is set to 1.5 V and appropriate termination (e.g., 50 Ω to VTT) is applied.

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

ZQ enables on-die output impedance calibration: connecting it to a precision resistor (RQ) to ground sets CQ, CQ, and Q[17:0] output impedance to 0.2 × RQ. Alternatively, tying ZQ to VDDQ activates minimum-impedance mode. It must never be left floating or tied to GND, as that disables calibration and risks signal integrity failure.