Cypress Semiconductor Corp CY7C1512V18-200BZXI

Overview

CY7C1512V18 from Cypress Semiconductor is a 4M × 18-bit (72-Mbit), 1.8V QDR-II SRAM with separate read/write ports, 250 MHz clock support, DDR interfaces on both ports (500 MT/s effective data rate), and 165-ball FBGA (15 × 17 × 1.4 mm) packaging. It delivers concurrent read/write operations without bus turnaround, enabling high-bandwidth packet buffering in network line cards and switch fabric controllers.

For engineers reviewing the CY7C1512V18 datasheet, CY7C1512V18 pinout, CY7C1512V18 application, or CY7C1512V18 equivalent, key selection criteria include its 2-word burst architecture, dual-clock timing (K/K and C/C), echo clocks (CQ/CQ), HSTL I/O compatibility, and synchronous self-timed write capability for deterministic latency in telecom infrastructure designs.

Technical Context

The CY7C1512V18 implements QDR-II architecture with physically independent read and write data paths-D[17:0] inputs and Q[17:0] outputs-eliminating bus contention and turn-around delays. Address latching occurs on alternating rising edges of K and K clocks, supporting 21-bit address space (2M × 18 configuration).

It uses a Delay Lock Loop (DLL) to align echo clocks CQ/CQ with output clocks C/C for precise data capture at 500 MT/s. Output impedance is tunable via ZQ pin (0.2×R_Q matching), and VREF sets HSTL reference level for all I/Os operating at VDDQ = 1.4–1.8 V.

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 non-Pb-free options available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C3256A-20TIN and IS61WV102418BLL-10BLI, the CY7C1512V18 uniquely delivers true concurrent read/write at 500 MT/s with DLL-aligned echo clocks-making it irreplaceable for line-rate packet buffering where deterministic latency and bus efficiency are mandatory.

Availability

CY7C1512V18 is available at Aetrix Electronics and suitable for high-speed network switch fabric, telecom line card buffering, baseband processing in 4G/LTE radio units, and high-performance test equipment requiring stable component supply and long-term lifecycle assurance.

Supply support for CY7C1512V18 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 systems, with emphasis on signal integrity and timing precision.

The QDR-II SRAM product line-including CY7C1512V18-is engineered specifically for deterministic, high-bandwidth memory interfacing in telecom infrastructure, where concurrent access, echo-clock synchronization, and sub-nanosecond timing control are critical.

FAQ

What is the maximum supported data rate for CY7C1512V18?

The CY7C1512V18 supports 250 MHz input clocks on K/K and C/C, enabling Double Data Rate transfers at 500 MT/s on both read and write ports. With an 18-bit bus width, this yields 9 Gbps aggregate bandwidth. The device achieves this using DLL-synchronized echo clocks (CQ/CQ) and HSTL I/O drivers optimized for 1.4–1.8 V VDDQ operation.

How does the CY7C1512V18 handle partial-word writes?

Partial-word writes are controlled by BWS[1:0] (Byte Write Select) signals. BWS0 enables writing to D[8:0], and BWS1 enables D[17:9]. When either is deasserted (HIGH), the corresponding 9-bit group remains unaltered-no read-modify-write cycle is needed. This preserves data integrity during burst updates in packet header modification or statistics counters.

Can CY7C1512V18 operate without the DLL enabled?

Yes-asserting DOFF (DLL Turn Off) LOW disables the internal DLL. However, timing parameters change significantly: CQ/CQ become asynchronous to C/C, and output hold times degrade. The datasheet explicitly states that all AC specifications assume DLL enabled; operation with DOFF asserted requires full re-characterization and is not recommended for production systems.

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

ZQ calibrates output driver impedance for Q[17:0] and CQ/CQ pins. Connect a precision resistor R_Q (typically 50 Ω) between ZQ and ground to set output impedance to 0.2 × R_Q (10 Ω). Alternatively, tie ZQ directly to VDDQ to enable minimum-impedance mode (≈7 Ω). Never leave ZQ floating or connect to GND-this causes undefined drive strength and signal integrity failure.