Cypress Semiconductor Corp CY7C1570KV18-500BZXI

Overview

CY7C1570KV18 from Cypress Semiconductor is a 72-Mbit (2M × 36) synchronous DDR II+ SRAM with two-word burst architecture, 2.5-cycle read latency at 500 MHz, HSTL I/O interfaces, and integrated PLL for precise data placement. It operates with core VDD = 1.8 V ± 0.1 V and I/O VDDQ = 1.4 V to 1.8 V, and is packaged in a 165-ball FBGA (13 × 15 × 1.4 mm). It serves as high-bandwidth memory buffer in network packet processors requiring deterministic low-latency DDR access.

For engineers reviewing the CY7C1570KV18 datasheet, CY7C1570KV18 pinout, CY7C1570KV18 application, or CY7C1570KV18 equivalent, key selection criteria include its 500 MHz clock rating, dual-edge echo clocks (CQ/CQ), QVLD data-valid indicator, DOFF-configurable latency mode (DDR II+ vs DDR I), and 36-bit wide synchronous burst interface.

Technical Context

The device implements a pipelined synchronous architecture where all address, control, and data signals are registered on rising edges of complementary K/K clocks. Read operations initiate on K's rising edge, with first 36-bit word output aligned to K and second to K - both synchronized to echo clocks CQ/CQ.

It integrates a PLL for accurate internal timing alignment and supports programmable output impedance via ZQ pin. The DOFF pin selects between 2.5-cycle DDR II+ mode (PLL enabled) and 1-cycle DDR I mode (PLL disabled), altering maximum frequency (500 MHz vs 167 MHz) and timing behavior.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T36150 and IS61WV102436B, CY7C1570KV18 uniquely delivers 500 MHz DDR II+ performance with echo-clock–assisted data capture and programmable latency - making it the sole option for new designs targeting ≥36 Gbps sustained memory bandwidth with sub-cycle timing predictability.

Availability

CY7C1570KV18 is available at Aetrix Electronics and suitable for network packet buffering, high-speed switch fabric memory, telecom baseband processing, and test equipment pattern memory requiring stable component supply across extended temperature ranges (–40°C to +85°C).

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) is a fabless semiconductor company specializing in high-performance memory, microcontrollers, and connectivity solutions for industrial, automotive, and communications markets.

CY7C1570KV18 belongs to Cypress's QDR II+/DDR II+ SRAM product line, engineered specifically for deterministic, high-throughput memory interfacing in packet-switched infrastructure and real-time signal processing systems.

FAQ

What is the function of the DOFF pin on CY7C1570KV18?

The DOFF pin controls the internal PLL: when asserted HIGH, it enables DDR II+ mode with 2.5-cycle read latency and operation up to 550 MHz; when pulled LOW, it disables the PLL and reverts the device to DDR I mode with 1-cycle latency and a maximum frequency of 167 MHz. This dual-mode capability allows backward compatibility with legacy controllers while supporting next-generation bandwidth requirements.

How does the ZQ pin affect signal integrity?

The ZQ pin connects to an external precision resistor (typically 50 Ω to ground) to calibrate the output driver impedance of DQ[35:0], CQ, and CQ pins. This calibration ensures output termination matches the PCB trace characteristic impedance (usually 50 Ω), minimizing reflections and maintaining clean eye diagrams at 500 MHz DDR rates - eliminating the need for discrete series or parallel termination resistors.

Can CY7C1570KV18 operate with only one clock input?

No. CY7C1570KV18 requires both complementary K and K clock inputs for correct operation. All synchronous inputs (address, R/W, LD, BWS) are registered on K's rising edge, while data inputs and outputs are registered on both K and K rising edges. Omitting either clock violates timing specifications and prevents reliable DDR data transfer - the device does not support single-ended clock mode.

What is the purpose of the QVLD signal in system design?

QVLD is a synchronous output that pulses high in alignment with the rising edges of CQ and CQ, indicating precisely when DQ[35:0] carries valid data during a read burst. Unlike clock-enable schemes, QVLD provides unambiguous, skew-compensated data validity - enabling system FPGAs or ASICs to capture full 36-bit words without complex deskew logic or per-bit delay tuning, significantly simplifying high-speed memory interface design.