Infineon Technologies CY7C1148KV18-400BZXC

Overview

CY7C1148KV18-400BZXC from Cypress Semiconductor is a 18-Mbit (1M × 18) synchronous pipelined DDR II+ SRAM with two-word burst architecture, 2.0-cycle read latency, and 400 MHz clock operation. It delivers 900 Mbps data throughput via double-data-rate I/O, uses HSTL-compatible 1.4 V to 1.8 V I/O supply (VDDQ), and integrates echo clocks (CQ/CQ) and QVLD for precise high-speed data capture in memory subsystems of network switches and baseband processors.

For engineers reviewing the CY7C1148KV18-400BZXC datasheet, CY7C1148KV18-400BZXC pinout, CY7C1148KV18-400BZXC application, or CY7C1148KV18-400BZXC equivalent, key selection criteria include its 400 MHz K/K clock support, 2.0-cycle latency mode (DOFF = HIGH), synchronous self-timed writes, 165-ball FBGA package, and JTAG 1149.1 test access capability.

Technical Context

This SRAM implements a synchronous pipelined architecture where address and control inputs (A, R/W, LD, BWS) are registered on the rising edge of K only, while write data is latched on both K and K rising edges. Read data is driven synchronously on both K and K rising edges, enabling true DDR operation at 400 MHz with 900 Mbps bandwidth.

The device embeds a PLL for accurate data placement and supports dual latency modes: 2.0-cycle latency (DOFF = HIGH) for DDR II+ timing compliance, and 1-cycle latency (DOFF = LOW) for backward compatibility with DDR I systems up to 167 MHz. Echo clocks CQ/CQ are free-running and phase-aligned to K/K, eliminating system-level skew compensation.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm body, RoHS-compliant, with 0.8 mm ball pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C3256B-15JCIN and IS61WV102418BLL-10BLI, CY7C1148KV18-400BZXC delivers 4.5× higher effective bandwidth and deterministic burst timing critical for packet-forwarding and DSP pipelines - but requires DDR-aware controller design and FBGA assembly capability.

Availability

CY7C1148KV18-400BZXC is available at Aetrix Electronics and suitable for network packet buffering, baseband signal processing, and depth-expanded memory subsystems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for CY7C1148KV18-400BZXC 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 timing robustness.

CY7C1148KV18 belongs to the QDR II+ SRAM product line, engineered specifically for deterministic, low-latency, high-bandwidth memory interfaces in packet-processing and real-time signal-path applications - not general-purpose storage.

FAQ

What is the function of the DOFF pin on CY7C1148KV18-400BZXC?

The DOFF (DLL/PLL Off) pin is an active-low control that disables the internal PLL. When pulled LOW, the device operates in DDR I mode with 1-cycle read latency and maximum clock frequency of 167 MHz. When held HIGH (typically via 10 kΩ pull-up), it enables DDR II+ mode with 2.0-cycle latency and full 400 MHz operation. This pin directly controls latency mode and clock domain behavior - no external configuration register is involved.

How does the ZQ pin affect signal integrity in high-speed designs?

The ZQ pin connects to an external precision resistor (typically 240 Ω) to ground, enabling on-die termination calibration. This adjusts the output driver impedance of DQ, CQ, and CQ signals to exactly 0.2 × RQ (e.g., 48 Ω), matching standard PCB trace impedances. Proper ZQ calibration reduces reflections, improves eye diagram margins, and eliminates the need for discrete series termination resistors on every data line.

Can CY7C1148KV18-400BZXC be used without the echo clocks CQ and CQ?

Yes - CQ and CQ are optional for system timing. The device drives valid data aligned to K and K rising edges regardless. However, omitting echo clocks requires the system controller to manage clock-to-data skew manually, increasing timing margin risk above 200 MHz. For 400 MHz operation, Cypress strongly recommends using CQ/CQ with QVLD to guarantee setup/hold compliance without complex PCB length matching.

What is the role of the LD (Load) signal in burst operation?

The LD (Load) signal is a synchronous control input sampled on the rising edge of K. It initiates each burst transaction: when LD goes LOW with R/W set, the current address is latched and a two-word burst begins. LD must remain stable for one full K cycle before and after the triggering edge. Unlike asynchronous CE, LD defines the exact clock boundary for address capture and burst start - making it essential for pipelined controller synchronization.