Infineon Technologies CY7C1570V18-400BZXC

Overview

CY7C1570V18 from Cypress Semiconductor is a 72-Mbit (2M × 36) synchronous pipelined DDR-II+ SRAM with 400 MHz clock operation, 2.5-cycle read latency, and HSTL I/O interfaces. It delivers 800 MT/s effective data rate via double-data-rate transfers on K/K clocks, supports burst-2 reads/writes, and integrates echo clocks (CQ/CQ) and QVLD for precise high-speed data capture in memory subsystems of network switches and packet buffers.

For engineers reviewing the CY7C1570V18 datasheet, CY7C1570V18 pinout, CY7C1570V18 application, or CY7C1570V18 equivalent, this device is selected for bandwidth-critical, low-latency buffer applications requiring deterministic 2.5-cycle read timing, synchronous self-timed writes, and impedance-matched HSTL signaling at 1.4–1.8 V IO supply.

Technical Context

The CY7C1570V18 implements a DDR-II+ architecture with dual input clocks (K and K), where all synchronous inputs-including address (A[19:0]), R/W, LD, and BWS[3:0]-are registered on the rising edge of K. Read data bursts two 36-bit words sequentially on alternating edges of K and K, aligned to echo clocks CQ/CQ and validated by QVLD.

It features an internal Delay Lock Loop (DLL) for accurate data placement, supports on-die impedance tuning via ZQ, and operates with core VDD = 1.8 V ± 0.1 V and IO VDDQ = 1.4 V to VDD. Write operations use synchronous self-timed circuitry, and output drivers are HSTL-compliant with variable drive strength.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 mm × 1.4 mm body, RoHS-compliant, with 0.8 mm ball pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1568V18, CY7C1570V18 offers native 36-bit width and simplified byte-write granularity (BWS[3:0]) for wider datapaths, while AS7C3256B-15JCIN lacks all DDR-II+ timing features and cannot meet deterministic 400 MHz system requirements.

Availability

CY7C1570V18 is available at Aetrix Electronics and suitable for network packet buffering, telecom line card caching, and high-speed test equipment requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for CY7C1570V18 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.

CY7C1570V18 belongs to the DDR-II+ SRAM product line engineered specifically for deterministic, high-bandwidth buffering in packet-switched infrastructure where 2.5-cycle latency and echo-clock synchronization are mandatory.

FAQ

What is the function of the DOFF pin on CY7C1570V18?

The DOFF pin disables the internal Delay Lock Loop when pulled LOW. In DLL-off mode, the device reverts to DDR-I timing with maximum 167 MHz operation and relaxed setup/hold margins. For full DDR-II+ performance at 400 MHz, DOFF must be pulled HIGH via ≤10 kΩ resistor to VDDQ.

How does the ZQ pin affect signal integrity in CY7C1570V18?

ZQ connects to an external resistor to ground (typically 100 Ω) to calibrate output driver impedance to 0.2 × RQ. This matches CQ, CQ, and DQ[35:0] to the PCB trace impedance, minimizing reflections and ensuring clean eye diagrams at 800 MT/s. Leaving ZQ unconnected or tied to GND violates specification.

Can CY7C1570V18 operate with VDDQ = 1.4 V while VDD = 1.8 V?

Yes. The datasheet explicitly permits VDDQ from 1.4 V to VDD (1.8 V). Operating at 1.4 V reduces IO power and noise while maintaining HSTL Class I compatibility. Core logic remains at 1.8 V, enabling independent voltage scaling for thermal and EMI optimization.

What is the role of QVLD in system-level timing design?

QVLD is a synchronous output pulse edge-aligned with CQ/CQ that asserts exactly when DQ[35:0] carries valid burst data. It replaces complex clock-domain crossing logic in FPGA receivers, allowing direct use as a data-valid strobe for FIFO loading or parallel-to-serial conversion without additional timing analysis.