Cypress Semiconductor Corp CY7C1570KV18-500BZC

Overview

CY7C1570KV18 from Cypress Semiconductor is a 72-Mbit synchronous DDR II+ SRAM configured as 2M × 36, operating at 500 MHz with 2.5-cycle read latency and double-data-rate interface delivering 1000 MT/s bandwidth. It features echo clocks (CQ/CQ), QVLD data-valid indicator, and programmable impedance via ZQ pin. Used in high-speed packet buffering and network switch fabric memory subsystems requiring deterministic low-latency burst access.

For engineers reviewing the CY7C1570KV18 datasheet, CY7C1570KV18 pinout, CY7C1570KV18 application, or CY7C1570KV18 equivalent, key selection considerations include DDR II+ timing mode (DOFF-controlled), HSTL I/O compatibility, 165-ball FBGA mechanical fit, and synchronous self-timed write architecture for predictable timing closure in multi-chip depth-expanded systems.

Technical Context

The CY7C1570KV18 implements a pipelined synchronous SRAM core with dual-clock DDR interface: K and K clocks control all register transfers, with address latched on alternate rising edges and data transferred on both edges. Its internal organization comprises two 1M × 36 arrays, supporting two-word burst reads/writes per transaction.

It integrates a PLL for precise data placement and echo clocks (CQ/CQ) aligned to output data edges-eliminating system-level skew compensation. The DOFF pin selects between DDR II+ mode (2.5-cycle latency, up to 550 MHz) and DDR I mode (1-cycle latency, ≤167 MHz), enabling flexible timing migration paths.

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 synchronous SRAM applications.

Compared with AS7C3256B-15JIN and IS61WV102432BLL-10BLI, the CY7C1570KV18 delivers 4× higher effective bandwidth via DDR II+, eliminates system-level timing uncertainty through QVLD and echo clocks, and supports scalable depth expansion without added skew management - making it uniquely suited for deterministic high-throughput packet and sample buffering.

Availability

CY7C1570KV18 is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, depth-expanded memory arrays, and high-speed test equipment FIFOs requiring stable component supply, long-term lifecycle support, and guaranteed FBGA package consistency.

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.

The CY7C1570KV18 belongs to Cypress's QDR II+/DDR II+ SRAM product line, designed specifically for deterministic, high-bandwidth memory interfacing in networking infrastructure and test equipment where sub-cycle timing predictability and echo-clock–assisted data capture are mandatory.

FAQ

What is the function of the DOFF pin on CY7C1570KV18?

The DOFF (PLL Turn Off) pin is an active-LOW control that disables the internal phase-locked loop. When asserted LOW, the device reverts to DDR I timing mode with 1-cycle read latency and maximum 167 MHz operation. When held HIGH (typically via 10 kΩ pull-up), DDR II+ mode activates with 2.5-cycle latency and up to 550 MHz capability. This pin enables hardware-selectable timing compatibility across generations.

How does the ZQ pin affect signal integrity in CY7C1570KV18?

The ZQ pin connects to an external 240 Ω resistor to ground, enabling on-die calibration of output driver impedance to precisely 48 Ω (0.2 × RQ). This matches typical HSTL-18 transmission lines, minimizing reflections and improving eye diagram margins without requiring discrete termination resistors on the PCB. Leaving ZQ unconnected or tying it to GND violates specification and degrades signal integrity.

Can CY7C1570KV18 be used in depth-expanded configurations without wait states?

Yes. The device supports zero-wait-state depth expansion because all synchronous inputs (LD, R/W, BWS) are registered on the K clock, and outputs (DQ, QVLD, CQ) are edge-aligned to K/K. When multiple devices share K/K clocks and use independent LD signals, their burst accesses align deterministically - allowing seamless interleaving without system-level skew compensation or added pipeline stages.

What is the role of QVLD and how does it differ from traditional RDY signals?

QVLD is a synchronous, edge-aligned validity indicator that asserts HIGH only when DQ[35:0] carries valid burst data - synchronized precisely to CQ/CQ rising edges. Unlike asynchronous RDY signals, QVLD eliminates setup/hold uncertainty and enables direct connection to FPGA input registers without delay chains or metastability hardening, reducing logic overhead and improving timing closure in high-speed capture paths.