Infineon Technologies CY7C1366C-166AXCT

Overview

CY7C1366C-166AXCT from Infineon Technologies (formerly Cypress) is a 9-Mbit pipelined synchronous SRAM configured as 256K × 36, operating at 166 MHz with 3.3 V core supply (VDD), 2.5 V/3.3 V I/O supply (VDDQ), and 3.5 ns clock-to-output delay. It supports Intel Pentium™-compatible interleaved or linear burst sequences and is used in high-speed secondary cache subsystems for embedded processors and communications controllers.

For engineers reviewing the CY7C1366C-166AXCT datasheet, CY7C1366C-166AXCT pinout, CY7C1366C-166AXCT application, or CY7C1366C-166AXCT equivalent, key selection criteria include burst mode configurability (MODE pin), triple chip enable architecture (CE1/CE2/CE3), registered synchronous interface timing, and TQFP-100 Pb-free packaging compatibility with depth-expansion designs.

Technical Context

This SRAM implements a fully synchronous, pipelined interface with dual address strobes (ADSP/ADSC), on-chip two-bit burst counter, and user-selectable burst order via MODE pin. All address, data, and control inputs are registered on the rising edge of CLK, enabling deterministic timing at 166 MHz.

It features asynchronous OE and ZZ controls, synchronous byte-write capability via BWx/BWE/GW, and pipelined output enable register to eliminate wait states during depth expansion. The device uses separate VDD (3.3 V ±5%/+10%) and VDDQ (2.5 V or 3.3 V) supplies with JEDEC JESD8-5-compatible I/Os.

Key Specifications

Pinout & Package

Package: 100-pin Pb-free Thin Quad Flat Package (TQFP), 14 × 20 × 1.4 mm, with 3 chip enables (CE1, CE2, CE3) and IEEE 1149.1 JTAG boundary scan support.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61WV102432BLL-166BLI and AS7C31026B-166PCN, the CY7C1366C-166AXCT uniquely delivers configurable burst sequencing, triple CE depth expansion, and integrated JTAG testability-critical for complex cache subsystems requiring design-for-test and multi-processor timing alignment.

Availability

CY7C1366C-166AXCT is available at Aetrix Electronics and suitable for secondary cache subsystems, network packet buffering, industrial motion controller memory, and radar signal processing buffers requiring stable component supply and long-term industrial lifecycle support.

Supply support for CY7C1366C-166AXCT 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

Infineon Technologies acquired Cypress Semiconductor in 2020 and maintains the full legacy SRAM portfolio, including high-performance synchronous devices for industrial, automotive, and communications infrastructure.

This part belongs to the Cypress DCD Sync SRAM product line, designed specifically for deterministic, high-throughput cache and buffer applications in systems demanding sub-4 ns access, burst configurability, and robust signal integrity at 166 MHz.

FAQ

What is the function of the MODE pin on CY7C1366C-166AXCT?

The MODE pin selects between Intel Pentium™-compatible interleaved burst addressing and linear burst addressing. It is sampled at power-up or reset to configure the internal two-bit burst counter's wraparound sequence. This enables direct compatibility with both legacy x86 processors and newer controllers using sequential access patterns, without requiring external logic or firmware reconfiguration.

Does CY7C1366C-166AXCT support 2.5 V-only I/O operation?

Yes. The device supports 2.5 V VDDQ operation with full AC/DC specifications met, including 3.5 ns tCO and 166 MHz maximum frequency. VDDQ must be decoupled independently from VDD, and all I/O pins (DQ/DQP, BWx, OE, etc.) are JESD8-5 compliant at 2.5 V, enabling seamless integration with 2.5 V processor buses while maintaining 3.3 V core stability.

How does the pipelined enable register improve depth expansion performance?

The pipelined enable register delays output buffer disable by one clock cycle after chip deselect, allowing consecutive burst transfers across multiple devices without inserting wait states. This eliminates the traditional "deselect penalty" in stacked SRAM configurations, enabling true 3-1-1-1 access rates across depth-expanded banks-critical for sustaining peak bandwidth in cache subsystems.

Is JTAG boundary scan functional on the 100-pin TQFP package?

Yes. The 100-pin TQFP package (suffix 'XCT') includes full IEEE 1149.1 JTAG support with dedicated TCK, TMS, TDI, and TDO pins. Boundary scan is enabled by default and supports chain testing of solder joints and interconnects. The JTAG feature can be disabled via instruction if required for security or pin multiplexing, but remains active out-of-box for production test readiness.