Infineon Technologies CY7C1329H-166AXCT

Overview

CY7C1329H-166AXCT 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-selectable writes via BWA–BWD and BWE. Used in high-speed secondary cache subsystems for embedded processors requiring deterministic timing and low-latency burst access.

For engineers reviewing the CY7C1329H-166AXCT datasheet, CY7C1329H-166AXCT pinout, CY7C1329H-166AXCT application, or CY7C1329H-166AXCT equivalent, key selection criteria include synchronous burst addressing with ADSP/ADSC strobes, ZZ sleep mode entry/exit timing (2tCYC), self-timed write control, JEDEC JESD8-5 I/O compliance, and 100-pin TQFP package mechanical compatibility.

Technical Context

The CY7C1329H-166AXCT uses a positive-edge-triggered CLK to register all synchronous inputs-including address (A0–A15), chip enables (CE1–CE3), burst controls (ADSP, ADSC, ADV), and write enables (BWA–BWD, BWE, GW). Its internal two-bit burst counter, seeded by A1/A0, generates sequential addresses for 4-word bursts under MODE pin selection (interleaved or linear).

Write operations are self-timed and support both global (GW-active) and byte-selectable (BWE + BW[A:D]) modes. Asynchronous OE controls I/O direction, while ZZ enables sleep mode with guaranteed data retention and 2-cycle entry/exit latency. All outputs are registered on CLK rise, enabling precise timing closure in high-frequency bus interfaces.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61WV204832BLL-166BLI and AS7C3256A-166JCIN, the CY7C1329H-166AXCT uniquely integrates dual-address-strobe support, user-configurable burst order, and hardware sleep mode-enabling drop-in compatibility with Intel-compatible architectures and dynamic power management not available in alternatives.

Availability

CY7C1329H-166AXCT is available at Aetrix Electronics and suitable for processor cache interfaces, network packet buffers, and industrial PLC memory expansion requiring stable component supply, long-lifecycle availability, and JEDEC-compliant TQFP packaging.

Supply support for CY7C1329H-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

Cypress Semiconductor (now part of Infineon Technologies) designs high-performance memory and programmable solutions for embedded systems, with headquarters in San Jose, CA and global R&D centers focused on timing-critical interfaces.

The CY7C1329H belongs to Cypress's high-speed synchronous SRAM product line, engineered specifically for secondary cache and burst-buffer applications in microprocessor-based systems requiring sub-4 ns access and deterministic pipeline behavior.

FAQ

What is the function of the MODE pin on CY7C1329H-166AXCT?

The MODE pin selects burst address sequencing: tied to GND for linear burst (00→01→10→11), or left floating/pulled to VDD for interleaved burst (00→01→10→11 → 01→00→11→10). It is a static strap pin sampled at power-up and must remain stable during operation to avoid burst corruption.

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, CE1/CE2/CE3, ADSP, and ADSC must remain inactive; any access attempt before tZZREC completion is invalid and yields undefined data.

Can ADSP and ADSC be used simultaneously on CY7C1329H-166AXCT?

No-ADSP and ADSC are mutually exclusive address strobes. When both are asserted LOW, the device recognizes only ADSP. ADSC is ignored if ADSP is active, ensuring unambiguous address capture in mixed-processor/controller environments without arbitration logic.

What is the role of the ADV signal during non-burst operations?

ADV has no effect outside burst sequences. It is sampled only when ADSP or ADSC initiates a burst access; during single-word reads/writes, ADV is ignored. This prevents unintended address advancement and maintains deterministic single-cycle behavior for non-sequential accesses.