Cypress Semiconductor Corp CY7C1512V18-167BZXC

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 for high-bandwidth packet buffering in network switches and routers.

For engineers reviewing the CY7C1512V18 datasheet, CY7C1512V18 pinout, CY7C1512V18 application, or CY7C1512V18 equivalent, key selection criteria include its 18-bit bus width, dual-clock timing architecture (K/K and C/C), echo clocks (CQ/CQ), HSTL I/O compatibility, and synchronous self-timed write capability.

Technical Context

The CY7C1512V18 implements QDR-II architecture with fully independent read and write ports sharing a multiplexed 21-bit address bus. Address latching occurs on alternating rising edges of K (read) and K (write) clocks, enabling pipelined access without bus turnaround.

It uses two dedicated output clocks (C and C) with corresponding echo clocks (CQ and CQ) to deskew data capture across high-speed PCB traces. The internal Delay Lock Loop (DLL) aligns output data to C/C edges, while DOFF allows DLL disable for specific timing constraints.

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, JEDEC MO-245 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1512V18-200BZXC, the -167BZXC trades peak bandwidth for relaxed timing margins and lower power; compared with AS7C3256A-15JCIN, it provides true concurrent access and deterministic DDR timing essential for modern packet processing.

Availability

CY7C1512V18-167BZXC is available at Aetrix Electronics and suitable for network packet buffering, high-speed switch fabric memory, and telecom line card memory requiring stable component supply and long-term industrial availability.

Supply support for CY7C1512V18-167BZXC 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 solutions for industrial, automotive, and communications markets.

This device belongs to Cypress's QDR-II SRAM product line, designed specifically for deterministic, high-bandwidth, low-latency memory subsystems in networking and telecom infrastructure where concurrent read/write and precise timing control are critical.

FAQ

What is the function of the ZQ pin on CY7C1512V18-167BZXC?

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) tied to ground to set output impedance to 0.2×RQ. Direct connection to VDDQ enables minimum impedance mode; floating or grounding ZQ is prohibited and may cause undefined behavior.

Can CY7C1512V18-167BZXC operate in single-clock mode?

Yes. When C and C are tied together and driven by K (or K), the device operates in single-clock mode. In this configuration, Q[17:0] and CQ/CQ are referenced to K/K instead of C/C, simplifying clock routing at the cost of reduced deskew capability. All timing parameters shift accordingly and are specified separately in the datasheet.

How does the DOFF pin affect timing performance?

Asserting DOFF (low) disables the internal Delay Lock Loop, causing Q[17:0] and CQ/CQ to be referenced directly to C/C without phase alignment. This increases output-to-clock skew and invalidates standard timing specifications-designers must perform full timing analysis and may need to add external delay elements to meet setup/hold requirements.

What is the purpose of BWS[1:0] in CY7C1512V18-167BZXC?

BWS[1:0] are active-low byte write select signals that enable partial-word writes: BWS0 controls D[8:0], BWS1 controls D[17:9]. When either signal is deasserted, the corresponding 9-bit byte is ignored during the write cycle, preserving existing data in those bits-critical for updating packet headers without overwriting payload fields.