Infineon Technologies CY7C1570KV18-450BZC

Overview

CY7C1570KV18 from Cypress Semiconductor is a 72-Mbit synchronous pipelined DDR II+ SRAM configured as 2M × 36, operating at up to 450 MHz (2.5-cycle read latency), with HSTL I/O, dual echo clocks (CQ/CQ), and QVLD data-valid indicator. It serves as high-bandwidth buffer memory in network packet processors requiring precise DDR timing and burst-aligned data transfer.

For engineers reviewing the CY7C1570KV18 datasheet, CY7C1570KV18 pinout, CY7C1570KV18 application, or CY7C1570KV18 equivalent, key selection criteria include its 2.5-cycle vs. 1-cycle latency mode (controlled by DOFF), 1.8 V core / 1.4–1.8 V I/O supply flexibility, JTAG 1149.1 test support, and FBGA-165 package compatibility with depth-expansion topologies.

Technical Context

This device implements a two-word burst architecture where each address access delivers two sequential 36-bit words on alternating edges of K/K clocks. Internal pipelining enables back-to-back read initiation every K cycle, while synchronous self-timed writes eliminate external write-strobe timing constraints.

The integrated PLL aligns output data edges to echo clocks CQ/CQ with sub-nanosecond skew, and ZQ pin enables dynamic output impedance calibration to match system bus termination. DOFF pin toggles between DDR II+ (2.5-cycle latency, ≤450 MHz) and DDR I (1-cycle latency, ≤167 MHz) operational modes.

Key Specifications

Pinout & Package

Package: 165-ball fine-pitch BGA (13 mm × 15 mm × 1.4 mm), RoHS-compliant, with 0.8 mm ball pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C362000B-450BIN and IS61WV102436BLL-450TQLI, CY7C1570KV18 uniquely combines echo-clock timing simplification, programmable latency, and ZQ calibration - making it optimal for space-constrained, multi-SRAM, mixed-voltage telecom and test equipment designs.

Availability

CY7C1570KV18 is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, depth-expanded memory subsystems, and test equipment pattern memory requiring stable component supply and long-term industrial availability.

Supply support for CY7C1570KV18 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.

CY7C1570KV18 belongs to the QDR II+/DDR II+ SRAM product line, engineered specifically for deterministic, low-jitter, high-bandwidth buffering in packet-processing and real-time test instrumentation systems.

FAQ

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

The DOFF pin controls the internal PLL: when HIGH, the device operates in DDR II+ mode with 2.5-cycle read latency up to 450 MHz; when LOW, it reverts to DDR I mode with 1-cycle latency and maximum 167 MHz operation. This allows hardware-level timing mode selection without firmware changes, supporting both performance-critical and legacy-compatible system configurations.

How do CQ and CQ echo clocks simplify system design?

CQ and CQ are free-running output clocks synchronized to the input K/K clocks, with edge alignment to Q[35:0] data transitions. They eliminate the need for board-level clock forwarding and deskew circuits, allowing system logic to sample data using local CQ/CQ edges - reducing timing margin uncertainty and simplifying layout in multi-SRAM depth-expanded systems.

Can CY7C1570KV18 operate with 1.5 V I/O supply?

Yes - the device supports VDDQ from 1.4 V to 1.8 V, explicitly including 1.5 V. Its HSTL Class I inputs and variable-drive outputs are fully compatible with 1.5 V signaling, enabling interoperability with legacy FPGAs and ASICs that lack 1.8 V I/O capability while maintaining full 450 MHz performance.

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

ZQ is an impedance calibration reference input. It must be connected to a precision resistor (typically 240 Ω) tied to ground to set output driver impedance to 0.2×RQ (~48 Ω). Alternatively, connecting ZQ directly to VDDQ enables minimum-impedance mode. It must never be left floating or tied to GND, as this disables calibration and risks signal integrity failure.