Cypress Semiconductor Corp CY7C1570KV18-450BZXI

Overview

CY7C1570KV18 from Cypress Semiconductor is a 72-Mbit synchronous pipelined DDR II+ SRAM with 2M × 36 organization, 450 MHz maximum clock frequency, 2.5-cycle read latency (when DOFF = HIGH), and HSTL I/O interface operating at 1.4–1.8 V VDDQ. It delivers 1100 MT/s effective data rate via double-data-rate transfers synchronized to K/K clocks and is used in high-bandwidth packet buffering and network switch fabric memory subsystems.

For engineers reviewing the CY7C1570KV18 datasheet, CY7C1570KV18 pinout, CY7C1570KV18 application, or CY7C1570KV18 equivalent, key selection criteria include burst depth (2-word), echo-clock–driven data capture (CQ/CQ), QVLD timing alignment, PLL-enabled latency mode selection (DOFF), and FBGA-165 package compatibility with high-density routing constraints.

Technical Context

This device implements a synchronous, pipelined DDR II+ architecture where all address, control, and data signals are registered on rising edges of complementary K/K clocks. Read operations initiate on LD/R/W assertion and complete in two consecutive K/K cycles, delivering two 36-bit words per access with QVLD edge-aligned to CQ/CQ.

The internal PLL enables precise 2.5-cycle latency timing when DOFF is HIGH; disabling the PLL (DOFF = LOW) reverts operation to DDR I mode with 1-cycle latency and ≤167 MHz max frequency. Echo clocks CQ/CQ are free-running, phase-locked to K, and drive external data capture without 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, 0.8 mm ball pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C362000B-15JIN and IS61WV102432BLL-10BLI, CY7C1570KV18 provides 7× higher bandwidth and deterministic DDR timing but requires complementary clock routing, echo clock receivers, and tighter power delivery - making it optimal for new high-speed designs where latency predictability and throughput outweigh integration effort.

Availability

CY7C1570KV18 is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, high-frequency trading engine cache, and test equipment pattern memory requiring stable component supply across extended product lifecycles.

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 timing precision.

CY7C1570KV18 belongs to the QDR II+/DDR II+ SRAM product line, engineered specifically for deterministic, high-bandwidth memory subsystems in packet-switched infrastructure where burst efficiency 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 pulled HIGH, the device operates in DDR II+ mode with 2.5-cycle read latency and supports up to 450 MHz clock frequency. When pulled LOW, it reverts to DDR I mode with 1-cycle latency and a maximum clock rate of 167 MHz - enabling backward compatibility with legacy controllers.

How does the ZQ pin affect output drive strength?

The ZQ pin connects to an external 240 Ω resistor to ground to calibrate the output driver impedance of DQ[35:0], CQ, and CQ pins to 48 Ω (0.2 × 240 Ω). This calibration compensates for process, voltage, and temperature variations, ensuring consistent signal integrity on high-speed memory buses. Leaving ZQ unconnected or tying it to GND violates specification and causes undefined drive strength.

Can CY7C1570KV18 be used without the echo clocks CQ/CQ?

No - CQ and CQ are mandatory for valid data capture. The device drives output data edge-aligned to these echo clocks, and QVLD is synchronized to them. External receivers must use CQ/CQ (not K/K) to latch DQ[35:0]. Omitting CQ/CQ routing results in failed timing closure and data corruption, as no alternative capture mechanism (e.g., source-synchronous with K/K) is supported.

What is the purpose of the BWS[3:0] signals in write operations?

BWS[3:0] are active-low byte write select signals that enable partial-word writes without read-modify-write cycles. For CY7C1570KV18, BWS0–BWS3 each control a 9-bit lane (D[8:0], D[17:9], D[26:18], D[35:27]). Asserting only selected BWS lines allows writing to specific byte groups while preserving others - essential for protocol header updates and non-aligned memory writes in networking applications.