Infineon Technologies CY7C1550V18-375BZC

Overview

CY7C1550V18 from Cypress Semiconductor is a 72-Mbit (2M × 36) synchronous pipelined DDR-II+ SRAM with 2-word burst architecture, 2.0-cycle read latency, and 375 MHz clock operation. It delivers 750 Mbps data transfer via double-data-rate interface, uses HSTL I/O with VDDQ = 1.4V–1.8V, and integrates echo clocks (CQ/CQ) and QVLD for precise high-speed data capture in networking and packet buffering applications.

For engineers reviewing the CY7C1550V18 datasheet, CY7C1550V18 pinout, CY7C1550V18 application, or CY7C1550V18 equivalent, key selection criteria include 36-bit wide I/O bus support, DLL-enabled timing alignment at 375 MHz, synchronous self-timed writes, JTAG 1149.1 test access, and 165-ball FBGA package compatibility with high-density PCB layouts.

Technical Context

The CY7C1550V18 implements a dual-clock DDR-II+ architecture where K and K control all synchronous inputs/outputs on rising edges. Its internal organization comprises two 1M × 36 memory arrays, enabling 2-word burst reads/writes per address cycle with deterministic 2.0-cycle latency.

It features a Delay Lock Loop (DLL) for sub-cycle data placement accuracy, echo clocks CQ/CQ aligned to output data edges, and QVLD synchronized to CQ/CQ transitions - eliminating external strobe routing complexity in multi-SRAM systems. Byte write select signals BWS[3:0] provide granular 9-bit byte-level write control across the 36-bit data bus.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C362000B-375BIN and IS61WV204836BLL-375T, the CY7C1550V18 uniquely delivers integrated echo clocks and QVLD for simplified high-speed capture, plus DLL-assisted sub-cycle timing - reducing system-level design effort by eliminating external timing alignment components and custom control logic.

Availability

CY7C1550V18 is available at Aetrix Electronics and suitable for network packet buffering, high-speed switch fabric memory, telecom line card buffering, and test equipment pattern memory requiring stable component supply across extended product lifecycles.

Supply support for CY7C1550V18 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 programmable logic solutions for communications and industrial markets.

The CY7C1550V18 belongs to Cypress's DDR-II+ SRAM product line, engineered specifically for deterministic-latency, high-bandwidth buffering in packet-switched infrastructure where echo-clock synchronization and burst efficiency are critical.

FAQ

What is the minimum VDDQ voltage supported by CY7C1550V18?

The CY7C1550V18 supports VDDQ from 1.4 V to VDD (1.8 V). Operation at 1.4 V is fully characterized per datasheet Rev. *D and maintains HSTL-18 compliance, enabling interoperability with 1.5 V FPGA I/O banks without level shifters. This lower voltage reduces I/O power by ~22% versus 1.8 V operation.

How does the DOFF pin affect timing behavior?

When DOFF is pulled LOW, the internal DLL is disabled and the device operates in DDR-I mode with maximum frequency limited to 167 MHz. All timing parameters shift to DDR-I specifications - including longer tAC and reduced tHZ - and echo clocks CQ/CQ become simple buffered copies of K/K without phase alignment.

Can CY7C1550V18 be used in depth-expanded configurations?

Yes - its automatic output tri-state on read deselect and deterministic 2.0-cycle latency enable seamless depth expansion. Two CY7C1550V18 devices can be interleaved on a 72-bit bus with no wait states, provided address decoding and R/W/LD control are synchronized to the same K/K clocks across both devices.

What is the function of the ZQ pin and how should it be terminated?

ZQ calibrates output driver impedance to match the system data bus. It must be connected to a 240 Ω resistor to ground; this sets CQ and DQ output impedance to 48 Ω (0.2 × 240 Ω). Direct connection to VDDQ enables minimum-impedance mode (~25 Ω), while floating or grounding ZQ violates specification and causes undefined output drive strength.