Infineon Technologies CY7C1548KV18-400BZC

Overview

CY7C1548KV18 from Cypress Semiconductor is a 72-Mbit (4M × 18) DDR II+ synchronous pipelined SRAM with two-word burst architecture, 2.0-cycle read latency at 400 MHz, HSTL I/O interface, and 1.8 V core / 1.4–1.8 V I/O supply. It delivers 900 Mbps data throughput via double-data-rate transfers synchronized to K/K clocks and supports echo-clock–based data capture in high-speed memory subsystems for networking line cards and packet buffer applications.

For engineers reviewing the CY7C1548KV18 datasheet, CY7C1548KV18 pinout, CY7C1548KV18 application, or CY7C1548KV18 equivalent, key selection criteria include DDR II+ timing compliance, QVLD-driven data validity signaling, PLL-enabled 2-cycle latency mode, and FBGA-165 package compatibility with high-density PCB layouts.

Technical Context

This SRAM implements a synchronous pipelined architecture where address and control signals are registered on the rising edge of K, while data is sampled on both K and K edges. The internal organization comprises two 2M × 18 arrays, enabling concurrent access to adjacent words within a single burst cycle.

The device integrates a PLL for precise data placement and uses echo clocks (CQ/CQ) aligned to output data, eliminating system-level skew compensation. DOFF pin selection determines operation mode: PLL-enabled DDR II+ (2-cycle latency, up to 450 MHz) or DDR I–compatible (1-cycle latency, ≤167 MHz).

Key Specifications

Pinout & Package

Package: 165-ball fine-pitch ball grid array (FBGA), 13 mm × 15 mm × 1.4 mm body height, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C362000B-400BIN and IS61WV102418BLL-400BLI, CY7C1548KV18 uniquely integrates PLL-based data placement and echo-clock–driven QVLD, reducing system-level timing validation effort and enabling higher reliability in jitter-sensitive packet buffering.

Availability

CY7C1548KV18 is available at Aetrix Electronics and suitable for networking line cards, telecom baseband units, and broadcast video encoders requiring stable component supply, long-term lifecycle support, and guaranteed FBGA-165 packaging consistency.

Supply support for CY7C1548KV18 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 demanding embedded and communications applications.

CY7C1548KV18 belongs to the QDR II+ SRAM product line, engineered specifically for deterministic, low-latency packet buffering and high-throughput inter-ASIC communication in carrier-grade infrastructure equipment.

FAQ

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

The DOFF pin disables the internal PLL when asserted LOW, switching the device into DDR I mode with 1-cycle read latency and maximum 167 MHz operation. When HIGH, the PLL enables DDR II+ mode with 2-cycle latency and up to 450 MHz clocking. This dual-mode capability allows backward compatibility while supporting higher bandwidth in new designs.

How does the ZQ pin calibrate output impedance?

ZQ connects to an external 240 Ω resistor to ground, enabling on-die calibration of CQ, CQ, and DQ output drivers to match 0.2 × RQ = 48 Ω. This achieves precise HSTL-compatible termination without discrete resistors, improving signal integrity on high-speed memory buses and reducing PCB layer count.

Can CY7C1548KV18 be used in depth-expanded configurations?

Yes - its automatic output tri-state on deselect, identical timing across all units, and shared K/K clocking allow seamless depth expansion. Two or more devices can be stacked with common control lines and independent DQ buses, enabling wider data paths (e.g., 36-bit or 72-bit) without added logic or timing penalties.

What is the role of QVLD in system-level timing closure?

QVLD is edge-aligned with CQ and CQ and asserts precisely when DQ[17:0] contains valid data. This eliminates the need for fixed or adaptive output delay settings in FPGA receivers, directly enabling single-cycle capture of burst data and significantly simplifying timing analysis and implementation in high-speed memory interfaces.