Infineon Technologies CY7C1346H-166AXC

Overview

CY7C1346H-166AXC from Cypress Semiconductor is a 2-Mbit (64K × 36) pipelined synchronous SRAM with registered I/O, 3.3V core/3.3V–2.5V I/O operation, 3.5 ns clock-to-output delay 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 addressing and byte-selectable writes.

For engineers reviewing the CY7C1346H-166AXC datasheet, CY7C1346H-166AXC pinout, CY7C1346H-166AXC application, or CY7C1346H-166AXC equivalent, key selection criteria include synchronous burst timing compliance, dual-address-strobe (ADSP/ADSC) support, ZZ sleep mode entry/exit latency, and byte-write control granularity across four 9-bit data groups.

Technical Context

The CY7C1346H-166AXC implements a two-bit wraparound burst counter fed by A1/A0, enabling user-selectable linear or interleaved (Pentium-compatible) burst sequences via the MODE strap pin. All synchronous inputs-including address, CE1/CE2/CE3, ADSP/ADSC, ADV, BWA–BWD, BWE, GW-are registered on the rising edge of CLK.

It supports both ADSP-initiated (two-cycle) and ADSC-initiated (single-cycle) write operations, with synchronous self-timed write circuitry and asynchronous OE/ZZ controls. Output drivers are tri-stated automatically during writes regardless of OE state, and VDDQ/VSSQ pins isolate I/O power domains for mixed-voltage interfacing.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flat Package (TQFP), JEDEC MO-140AC, 14 mm × 20 mm body, 0.5 mm lead pitch, lead-free (RoHS-compliant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V2115L16PF and IS61WV102436B, the CY7C1346H-166AXC uniquely combines Pentium-interleaved burst support, dual-address-strobe arbitration, and autonomous ZZ sleep-making it irreplaceable in legacy x86 cache subsystems requiring zero-software power management.

Availability

CY7C1346H-166AXC is available at Aetrix Electronics and suitable for Intel Pentium-based industrial PCs, telecom line card buffers, avionics data loggers, and motion controller memory subsystems requiring stable component supply and long-term lifecycle support.

Supply support for CY7C1346H-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) is a U.S.-based semiconductor company specializing in high-performance memory, microcontrollers, and programmable logic devices for industrial, automotive, and communications markets.

The CY7C1346H belongs to Cypress's high-speed synchronous SRAM product line, designed specifically for low-latency, burst-mode cache and buffer applications in x86-compatible and real-time embedded systems.

FAQ

What is the function of the MODE pin on CY7C1346H-166AXC?

The MODE pin is a static configuration input that selects burst sequence behavior: tied to GND enables linear burst order; tied to VDD or left floating enables Intel Pentium-compatible interleaved burst. It must remain stable during operation and has an internal pull-up resistor, so floating defaults to interleaved mode.

How does the ZZ sleep mode affect timing during wake-up?

When ZZ transitions from HIGH to LOW, the device requires exactly two clock cycles (2tCYC) before normal operation resumes. During this recovery window (tZZREC), CE1/CE2/CE3/ADSP/ADSC must remain inactive. No accesses are guaranteed valid during entry or exit from sleep mode.

Can CY7C1346H-166AXC operate with 2.5V I/O while maintaining 3.3V core supply?

Yes. The device uses separate VDDQ (I/O supply) and VDD (core supply) pins. VDDQ may be set to either 3.3V or 2.5V independently, while VDD must remain at 3.3V ± 0.3V. All I/O pins are JESD8-5 compliant and tolerate mixed-voltage interfaces without level shifters.

What is the difference between ADSP and ADSC strobes in system design?

ADSP is intended for processor-initiated accesses and takes priority over ADSC when both are asserted. ADSC is used for controller-initiated operations (e.g., DMA engines or ASICs). This dual-strobe architecture enables clean separation of CPU and peripheral memory traffic without bus contention or arbitration logic.