Infineon Technologies CY7C1368C-166AXC

Overview

CY7C1368C-166AXC from Cypress Semiconductor is a 9-Mbit (256K × 32) pipelined synchronous SRAM with registered I/O, 3.3V core/2.5V–3.3V I/O supplies, 3.5 ns max access time at 166 MHz, and JEDEC-standard 100-pin TQFP packaging. It serves as high-speed secondary cache memory in Pentium-class processor systems requiring burst-mode support and depth expansion without wait states.

For engineers reviewing the CY7C1368C-166AXC datasheet, CY7C1368C-166AXC pinout, CY7C1368C-166AXC application, or CY7C1368C-166AXC equivalent, key selection criteria include synchronous burst timing (interleaved/linear), double-cycle deselect behavior, byte-write granularity (BWA–BWD + BWE), 3-chip-enable depth expansion (A version), and ZZ sleep mode compatibility with low-power system states.

Technical Context

The CY7C1368C-166AXC implements a two-bit synchronous wraparound burst counter fed by A[1:0], enabling Intel Pentium interleaved or linear burst sequences selected via the static MODE pin. All address, data, and control inputs (ADSP/ADSC, CE1–CE3, BW[A:D], GW, BWE) are registered on the rising edge of CLK.

It supports dual-address-strobe operation (ADSP for processor-initiated, ADSC for controller-initiated accesses), synchronous self-timed writes, and asynchronous OE/ZZ controls. Output buffers feature pipelined enable logic that delays tri-state assertion by one clock cycle during deselect, preserving throughput in depth-expanded configurations.

Key Specifications

Pinout & Package

Package: 100-pin TQFP (14 mm × 14 mm, 0.5 mm pitch), JEDEC standard, lead-free (RoHS-compliant). The -166AXC suffix denotes the A version with three chip enables (CE1, CE2, CE3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61WV25632ALL-166BLI, the CY7C1368C-166AXC delivers guaranteed Pentium interleaved burst timing and 3-CE depth scalability; versus 23LC1024-I/P, it provides 8× higher effective bandwidth and deterministic sub-4 ns read latency required for real-time cache subsystems.

Availability

CY7C1368C-166AXC is available at Aetrix Electronics and suitable for Intel Pentium-based cache subsystems, industrial real-time controllers, network packet buffering, and medical imaging frame stores requiring stable component supply across extended product lifecycles.

Supply support for CY7C1368C-166AXC 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, with expertise in synchronous SRAM, NOR Flash, and PSoC architectures.

The CY7C1368C belongs to Cypress's Pipelined DCD Sync SRAM product line, engineered specifically for low-latency, burst-capable secondary cache and high-speed buffering in x86 and real-time embedded platforms.

FAQ

What is the function of the MODE pin on CY7C1368C-166AXC?

The MODE pin is a static configuration input that selects the burst sequence type: tied to GND for linear burst order, or to VDD/floating for Intel Pentium interleaved burst order. It is sampled at power-up and must remain stable during operation-no runtime switching is supported. The internal pull-up ensures default interleaved behavior if left unconnected.

Can CY7C1368C-166AXC operate with 2.5 V I/O while using 3.3 V core supply?

Yes. The device supports independent VDDQ (2.5 V or 3.3 V) and VDD (3.3 V ± 0.3 V) supplies. This allows direct interfacing with 2.5 V FPGAs or ASICs without level shifters, while maintaining full-speed 166 MHz operation and 3.5 ns access timing. VDDQ and VSSQ pins must be decoupled separately per JEDEC layout guidelines.

How does double-cycle deselect improve system performance?

Double-cycle deselect ensures outputs remain valid for one additional clock cycle after chip enable deactivation. This eliminates the need for wait states when chaining multiple CY7C1368C devices in depth-expanded configurations, sustaining continuous burst read throughput across banks without pipeline stalls or external handshaking logic.

Is CE3 available on all CY7C1368C package variants?

No. CE3 is present only on the "A" version (e.g., CY7C1368C-166AXC), packaged in 100-pin TQFP with three chip enables. The "AJ" version omits CE3 and uses only CE1 and CE2. Pinout diagrams in the datasheet (pages 3–4) confirm CE3 is located at pin 92 for the A version and absent in the AJ variant.