Infineon Technologies CYD18S36V18-167BBAI

Overview

CYD18S36V18-167BBAI from Cypress Semiconductor is a 18-Mbit (512K × 36) synchronous true dual-port SRAM with independent 36-bit ports, 1.5 V/1.8 V core supply, and SDR operation at up to 200 MHz. It enables deterministic concurrent read/write access to shared memory in high-throughput inter-processor communication, network packet buffering, and real-time video frame storage.

For engineers reviewing the CYD18S36V18-167BBAI datasheet, CYD18S36V18-167BBAI pinout, CYD18S36V18-167BBAI application, or CYD18S36V18-167BBAI equivalent, key selection criteria include dual-port collision handling, selectable pipelined/flow-through latency, per-port I/O voltage flexibility (1.4–2.5 V), echo clocking for timing margin, and JTAG boundary scan for system-level testability.

Technical Context

This device implements two fully independent synchronous ports-each with its own address bus, data bus (36-bit), byte enables (4 per port), control signals (CE0/CE1, R/W, OEN), and clock domain-enabling simultaneous access without arbitration overhead. Deterministic access control resolves same-address contention via busy flag assertion and first-busy address readback within one cycle.

Each port supports configurable pipelined mode (two-stage latency) or flow-through mode (zero-cycle latency), with programmable burst counters, mailbox interrupts, and echo clocks synchronized to output data edges. Variable impedance matching (VIM) on DQ pins allows dynamic driver strength tuning to match PCB trace impedance.

Key Specifications

Pinout & Package

256-ball Fine-Pitch BGA (FBGA), 17 mm × 17 mm, 1.0 mm ball pitch, RoHS-compliant. Pinout conforms to FullFlex36 family layout with dedicated left/right port signal groups, dual chip enables, echo clocks (CQ0/CQ1), and ZQ calibration balls for VIM.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CYD18S36V18-167BBAI, the BAC variant offers identical performance at lower cost for commercial use, while the IS61VPS51236A lacks echo clocks and mailbox-critical for high-speed inter-processor sync and interrupt-driven messaging in modern embedded designs.

Availability

CYD18S36V18-167BBAI is available at Aetrix Electronics and suitable for telecom infrastructure, real-time video processing, multi-core processor interconnect, and industrial motion control requiring stable component supply across long production lifecycles.

Supply support for CYD18S36V18-167BBAI 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 embedded systems, emphasizing reliability, low power, and system-level integration.

CYD18S36V18 belongs to the FullFlex36 family of synchronous dual-port SRAMs, engineered specifically for deterministic, high-bandwidth inter-processor communication in networking, video, and industrial automation systems.

FAQ

What is the maximum supported I/O voltage per port?

CYD18S36V18-167BBAI supports four selectable I/O standards per port: LVTTL (3.3 V), Extended HSTL (1.4–1.9 V), 1.8 V LVCMOS, and 2.5 V LVCMOS. Selection is controlled by PORTSTD[1:0] pins, and each port may be configured independently. HSTL support was removed after WW1830 per datasheet revision *S, but all other standards remain fully functional.

How does deterministic access control resolve simultaneous accesses?

When both ports attempt to access the same memory location on the same clock edge, the device asserts BUSYL or BUSYR (depending on port priority), outputs the colliding address on the address bus, and sets the first-busy address register. The collision is detected on back-to-back cycles, and no data corruption occurs-the winning port completes its access while the losing port receives a busy response, enabling predictable software recovery.

Can the burst counter operate across both ports simultaneously?

No-the burst counter is implemented per port and operates independently. Each port has its own CNT/MSKL/R, CNTENL/R, CNTRSTL/R, and CNTINTR signals. Counters cannot be linked or synchronized across ports; however, mailbox interrupts allow coordinated triggering of counter reloads or resets via inter-port messaging.

Is JTAG boundary scan supported in all operating modes?

Yes-IEEE 1149.1 JTAG boundary scan remains fully functional regardless of pipelined/flow-through mode, I/O voltage selection, or echo clock enable state. TRST, TMS, TDI, TDO, and TCK pins retain their boundary-scan functionality during active memory operation, enabling in-system test and debug without halting system clocks.