Infineon Technologies CYD18S72V18-167BGI

Overview

CYD18S72V18-167BGI from Cypress Semiconductor is a 18-Mbit (256K × 72) synchronous true dual-port SRAM with independent 72-bit ports, 1.5 V/1.8 V core supply, and SDR operation at 200 MHz. It supports pipelined or flow-through read latency modes, deterministic collision resolution, and dual chip enables for depth expansion in high-bandwidth inter-processor communication systems.

For engineers reviewing the CYD18S72V18-167BGI datasheet, CYD18S72V18-167BGI pinout, CYD18S72V18-167BGI application, or CYD18S72V18-167BGI equivalent, key selection criteria include simultaneous dual-port bandwidth (28.8 Gbps), JTAG boundary scan support, echo clocking for timing margin improvement, and configurable I/O standards including 1.8 V LVCMOS and Extended HSTL.

Technical Context

This device implements a synchronous dual-port architecture with two independent 72-bit data buses, each supporting single-cycle pipelined reads at 200 MHz and configurable burst counters for sequential access. Deterministic collision detection outputs a busy flag and enables first-busy address readback on back-to-back accesses to identical addresses.

Each port features selectable I/O standards (1.8 V LVCMOS, 2.5 V LVCMOS, LVTTL, or Extended HSTL), variable impedance matching (VIM) for signal integrity, and echo clocks synchronized to output data edges. The 484-ball PBGA package supports full 72-bit bus width per port with eight byte enables (BE[7:0]) and dedicated mailbox interrupt flags for inter-processor messaging.

Key Specifications

Pinout & Package

Package: 484-ball plastic BGA (PBGA), 27 mm × 27 mm, 1.0 mm ball pitch, top-side marking includes "CYD18S72V18-167BGI" and date code.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CYD36S72V18-167BGI, the higher-density variant offers direct PCB compatibility but increases cost and power; versus AS7C3256A-15JCIN, CYD18S72V18-167BGI delivers 19× higher bandwidth and deterministic arbitration essential for modern packet processing.

Availability

CYD18S72V18-167BGI is available at Aetrix Electronics and suitable for telecom line cards, network processor interfaces, avionics data concentrators, and industrial PLC redundancy modules requiring stable component supply and long-term lifecycle support.

Supply support for CYD18S72V18-167BGI 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 communications, industrial, and automotive markets, with headquarters in San Jose, CA.

CYD18S72V18 belongs to the FullFlex™ SDR Dual-Port SRAM product line, engineered specifically for deterministic, high-bandwidth inter-processor communication in multi-clock-domain systems such as network switches and real-time control platforms.

FAQ

What I/O voltage standards does CYD18S72V18-167BGI support per port?

CYD18S72V18-167BGI supports four selectable I/O standards per port: 1.8 V LVCMOS, 2.5 V LVCMOS, LVTTL (3.3 V), and Extended HSTL (1.4 V to 1.9 V). Selection is controlled by PORTSTD[1:0] pins at power-up, and each port can be configured independently. HSTL support was removed after WW1830 per datasheet revision notes, but all other standards remain fully functional.

How does deterministic collision resolution work on this device?

When both ports attempt to access the same memory address in the same or consecutive clock cycles, the device asserts BUSYL/BUSYR within one cycle and outputs the conflicting address on the address bus. The first-busy address is latched and readable immediately, while subsequent collisions increment an internal busy counter. This eliminates arbitration uncertainty and guarantees bounded latency for safety-critical applications.

Is echo clocking required for reliable 200 MHz operation?

Echo clocking (CQ0L/CQ1L, CQ0R/CQ1R) is not mandatory but strongly recommended for 200 MHz SDR operation. These source-synchronous clocks align with data output edges, reducing timing margin dependency on board trace length matching. Designs omitting echo clocks must rely on precise PCB layout and tighter skew control, increasing validation risk in high-density routing environments.

Can CYD18S72V18-167BGI be used in place of CYD18S36V18 in an existing design?

No - CYD18S72V18-167BGI uses a 484-ball PBGA package with 72-bit data width per port, while CYD18S36V18 uses a 256-ball FBGA package with 36-bit width. Pin count, ball pitch, and signal mapping are incompatible. Migration would require PCB redesign, FPGA/ASIC interface rework, and firmware address map changes due to differing depth/width ratios (256K × 72 vs. 512K × 36).