Cypress Semiconductor Corp CY7C1570KV18-400BZC

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 400 MHz, HSTL I/O interface, and integrated PLL for precise data placement. It operates with core VDD = 1.8 V ± 0.1 V and I/O VDDQ = 1.4–1.8 V, and is packaged in a 165-ball FBGA (13 × 15 × 1.4 mm). It serves as high-bandwidth buffer memory in network packet processors and FPGA co-processor subsystems.

For engineers reviewing the CY7C1570KV18 datasheet, CY7C1570KV18 pinout, CY7C1570KV18 application, or CY7C1570KV18 equivalent, key selection criteria include its 2M × 36 organization, dual-edge DDR timing with echo clocks CQ/CQ, QVLD data-valid signaling, DOFF-configurable latency mode (DDR II+ vs DDR I), and JTAG 1149.1 test access support.

Technical Context

The CY7C1570KV18 implements a pipelined synchronous SRAM core with DDR II+ peripheral logic, using two independent input clocks (K and K) to latch address/control on K's rising edge and register write data on both K and K edges. Read data is driven synchronously on both clock edges with echo-clock alignment.

Its internal 2M × 36 organization comprises two 1M × 36 arrays; burst reads deliver two sequential 36-bit words per access. The PLL enables accurate data-eye positioning at 400 MHz, while DOFF pin selection toggles between 2.5-cycle (DOFF = HIGH) and 1-cycle (DOFF = LOW) read latency modes - preserving DDR I compatibility without re-design.

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 AS7C336200B-400BIN and IS61WV102436BLL-400BLI, the CY7C1570KV18 delivers double the density (72 Mbit), true DDR II+ timing with built-in PLL and echo clocks, and deterministic QVLD signaling - enabling higher bandwidth, lower system-level timing overhead, and simplified layout in demanding communications infrastructure designs.

Availability

CY7C1570KV18 is available at Aetrix Electronics and suitable for network packet buffering, FPGA co-processor cache, and telecom baseband processing requiring stable component supply, long-term lifecycle assurance, and full traceability.

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 U.S.-based semiconductor company specializing in high-performance memory, microcontrollers, and programmable system-on-chip solutions for industrial, automotive, and communications markets.

The CY7C1570KV18 belongs to Cypress's QDR II+/DDR II+ SRAM product line, engineered specifically for ultra-low-latency, high-bandwidth buffering in networking ASICs, FPGAs, and baseband processors where deterministic timing and signal integrity are critical.

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 PLL when pulled LOW. In this state, the device operates in DDR I mode with 1-cycle read latency and a maximum frequency of 167 MHz. When DOFF is HIGH, the PLL is enabled, supporting 2.5-cycle latency and full 400 MHz operation. This pin allows runtime mode switching or hardware configuration for backward compatibility.

How does the QVLD signal improve system timing reliability?

QVLD is a synchronous output asserted edge-aligned with CQ and CQ echo clocks, indicating precisely when DQ[35:0] data is valid. Unlike fixed-delay assumptions, QVLD eliminates setup/hold uncertainty at the receiver - especially critical in multi-SRAM depth-expanded systems - allowing FPGA or ASIC logic to sample data without guard bands or complex timing closure iterations.

Can CY7C1570KV18 operate with VDDQ = 1.5 V?

Yes. The device supports VDDQ from 1.4 V to 1.8 V, explicitly including 1.5 V. At 1.5 V, HSTL Class I output drivers maintain proper voltage thresholds and impedance calibration via ZQ, ensuring signal integrity and compatibility with 1.5 V FPGA I/O banks without level-shifting circuitry.

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

ZQ is an impedance calibration reference pin requiring connection to a 240 Ω resistor tied to ground. This enables the device to tune its HSTL output drivers to ~48 Ω (0.2 × 240 Ω), matching typical PCB trace impedance. Leaving ZQ unconnected or tying it to GND violates specifications and degrades signal integrity; direct connection to VDDQ enables minimum-impedance mode but forfeits calibration accuracy.