Cypress Semiconductor Corp CY7C1512V18-250BZXI

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 operation, 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 transactions for high-throughput packet buffering in network line cards.

For engineers reviewing the CY7C1512V18 datasheet, CY7C1512V18 pinout, CY7C1512V18 application, or CY7C1512V18 equivalent, key selection criteria include its dual-clock DDR timing architecture, HSTL I/O compatibility, DLL-controlled data placement, 18-bit burst width, and support for depth expansion via BWS[1:0] and RPS/WPS controls.

Technical Context

The CY7C1512V18 implements QDR-II architecture with fully independent read and write pipelines, each synchronized to dedicated K/K input clocks and C/C output clocks. Its 2-word burst transfers 36 bits per access cycle - two sequential 18-bit words - eliminating bus turnaround overhead.

It uses a Delay Lock Loop (DLL) to align echo clocks (CQ/CQ) with output clocks (C/C), enabling precise data capture at 500 MT/s. Address inputs (A[20:0]) are multiplexed for both ports, latched on alternating rising edges of K/K, supporting 2M × 18 internal organization across two 1M × 18 arrays.

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, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C3256A-25JCIN and IS61WV102418BLL-10BLI, the CY7C1512V18 uniquely delivers concurrent 500 MT/s read/write throughput, DLL-aligned echo clocks for timing closure, and HSTL I/O for signal integrity - making it irreplaceable in high-speed packet-forwarding and real-time instrumentation.

Availability

CY7C1512V18 is available at Aetrix Electronics and suitable for network infrastructure, test & measurement equipment, and telecom baseband subsystems requiring stable component supply and long-term obsolescence management.

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 demanding embedded and communications applications.

The QDR-II SRAM product line targets high-bandwidth, low-latency buffering in networking, wireless infrastructure, and instrumentation - emphasizing deterministic timing, concurrent access, and signal integrity at multi-Gbps rates.

FAQ

What is the function of the ZQ pin on CY7C1512V18?

The ZQ pin calibrates output driver impedance for Q[17:0], CQ, and CQ signals. It must be connected to a precision resistor (typically 100 Ω) to ground to set output impedance to 20 Ω (0.2 × RQ). Direct connection to VDDQ enables minimum-impedance mode; floating or grounding ZQ is prohibited and will cause undefined I/O behavior.

Can CY7C1512V18 operate with only one clock domain?

Yes - the device supports single-clock mode where K/K serve as both input and output clocks. In this mode, C/C are unused, and Q[17:0] data is driven on rising edges of K/K. However, echo clocks (CQ/CQ) remain tied to K/K, and DLL functionality remains active unless disabled via DOFF.

How does BWS[1:0] control write operations in CY7C1512V18?

BWS[1:0] are active-low byte write selects: BWS0 enables writing to D[8:0], and BWS1 enables writing to D[17:9]. When both are asserted, the full 18-bit word is written; when only one is active, only its corresponding 9-bit byte updates. Unselected bytes retain prior values - enabling partial-word writes without read-modify-write cycles.

Is CY7C1512V18 pin-compatible with other QDR-II family members?

No - while all QDR-II SRAMs share the same 165-ball FBGA footprint, pin assignments differ significantly across configurations (e.g., CY7C1510V18 x8 vs. CY7C1512V18 x18). Address, data, and control pin counts vary, and BWS/NWS signal mapping is configuration-specific. Board-level reuse requires redesign of routing and termination.