Infineon Technologies CY7C1329H-166AXC

Overview

CY7C1329H-166AXC from Cypress Semiconductor is a 2-Mbit (64K × 32) pipelined synchronous SRAM with registered I/O, 3.3V core supply, 2.5V/3.3V I/O compatibility, and 3.5 ns clock-to-output delay at 166 MHz. It implements a two-bit wraparound burst counter for Intel Pentium®-compatible interleaved or linear burst sequences and supports byte-write and global-write operations in high-speed cache subsystems.

For engineers reviewing the CY7C1329H-166AXC datasheet, CY7C1329H-166AXC pinout, CY7C1329H-166AXC application, or CY7C1329H-166AXC equivalent, key selection criteria include synchronous burst timing, dual-address-strobe (ADSP/ADSC) support, ZZ sleep mode entry/exit timing, JEDEC JESD8-5 I/O compliance, and TQFP-100 package mechanical constraints.

Technical Context

The CY7C1329H-166AXC uses positive-edge-triggered CLK to register all synchronous inputs-including ADSP, ADSC, ADV, CE1–CE3, BWA–BWD, BWE, GW-and latches outputs via output registers. Its internal two-bit burst counter (fed by A1,A0) generates sequential addresses during burst reads/writes under ADV control.

Burst order (interleaved or linear) is statically selected via MODE pin; interleaved mode matches Pentium® address mapping, while linear mode suits x86-compatible or custom controllers. Write cycles are self-timed and support single-cycle ADSC-initiated or two-cycle ADSP-initiated writes, with OE-controlled tri-state outputs and automatic DQ tri-state during write detection.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flat Package (TQFP), JEDEC-standard lead-free, 14 mm × 14 mm body, 0.5 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61WV102432BLL-166TQLI, CY7C1329H-166AXC offers native dual-strobe arbitration and configurable burst modes critical for x86 cache designs; versus MC10E131FN, it provides actual 2-Mbit storage-not just signal registration-making it irreplaceable in memory-buffering roles.

Availability

CY7C1329H-166AXC is available at Aetrix Electronics and suitable for secondary cache subsystems, high-speed network buffers, and real-time DSP data buffers requiring stable component supply, long-lifecycle support, and JEDEC-compliant TQFP packaging.

Supply support for CY7C1329H-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 fabless semiconductor company specializing in high-performance memory, microcontrollers, and programmable solutions for industrial, automotive, and communications markets.

The CY7C1329H belongs to Cypress's high-speed synchronous SRAM product line, designed specifically for low-latency, burst-capable cache and buffer applications in x86 and custom controller-based systems.

FAQ

What is the function of the MODE pin, and how must it be configured?

The MODE pin selects burst sequence order: tied to GND for linear burst, or left floating/VDD for interleaved (Intel Pentium®-compatible) burst. It is a static strap pin-must remain unchanged during operation. Internal pull-up ensures default interleaved behavior if unconnected. Incorrect MODE configuration causes misaligned burst addressing and data corruption.

How does the ZZ sleep mode interact with ongoing memory accesses?

ZZ sleep mode requires the device to be fully deselected (CE1, CE2, CE3 inactive; ADSP/ADSC deasserted) before activation. Any pending access at ZZ assertion is invalidated and not guaranteed to complete. Entry and exit each require exactly two clock cycles (2tCYC), during which no valid accesses may occur. Data integrity is preserved throughout sleep.

Can ADSP and ADSC be asserted simultaneously, and what happens if they are?

No-ADSP and ADSC are mutually exclusive. When both are LOW, only ADSP is recognized and ADSC is ignored. This priority ensures deterministic behavior in mixed-processor/controller systems. Asserting both violates the truth table and may cause undefined address capture or burst counter initialization.

What is the timing relationship between ADV and burst address generation?

ADV must be asserted LOW synchronously with the rising edge of CLK to increment the internal 2-bit burst counter. The new address appears at the memory array inputs on the subsequent CLK edge. ADV is sampled only during active burst cycles-ignored during single-access or deselected states-and must remain stable for setup/hold relative to CLK.