Infineon Technologies CY7C1329-100AC

Overview

CY7C1329-100AC from Cypress Semiconductor is a 3.3V, 64K × 32-bit synchronous-pipelined cache SRAM with 100-MHz operation, 5.5 ns clock-to-output delay, JEDEC-standard 100-pin TQFP package, and user-selectable linear/interleaved burst mode. It serves as zero-wait-state secondary cache for PowerPC and Pentium-class systems requiring high-bandwidth, low-latency memory access.

For engineers reviewing the CY7C1329-100AC datasheet, CY7C1329-100AC pinout, CY7C1329-100AC application, or CY7C1329-100AC equivalent, key selection criteria include synchronous self-timed write support, dual address strobe (ADSP/ADSC) control, burst counter architecture, and ZZ sleep mode timing behavior.

Technical Context

The device implements fully registered synchronous I/O with all inputs latched and outputs driven on the rising edge of CLK. Its 2-bit wraparound burst counter captures A[1:0] at access initiation and auto-increments per ADV assertion, supporting both Intel Pentium interleaved and PowerPC linear burst sequences selected via static MODE pin.

Write operations are managed through three hierarchical controls: Global Write (GW), Byte Write Enable (BWE), and Byte Write Select (BW[3:0]), with synchronous self-timed internal write sequencing. Chip select logic uses three synchronous enables (CE1 active-low, CE2 active-high, CE3 active-low) plus asynchronous OE and ZZ for output and power-state control.

Key Specifications

Pinout & Package

Package: 100-pin TQFP (14 mm × 14 mm, 0.5 mm pitch), JEDEC standard, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV25616AL-10TLI and AS7C3256A-10JIN, the CY7C1329-100AC uniquely delivers pipelined 100-MHz operation with integrated burst counter, dual strobe support, and synchronous self-timed writes-enabling true zero-wait-state cache implementation without external timing control.

Availability

CY7C1329-100AC is available at Aetrix Electronics and suitable for desktop CPU cache subsystems, embedded RISC processor memory interfaces, and legacy workstation graphics acceleration requiring stable component supply and long-term obsolescence management.

Supply support for CY7C1329-100AC 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 logic solutions for computing and communications infrastructure.

The CY7C1329 belongs to Cypress's synchronous cache SRAM product line, designed specifically to replace asynchronous SRAMs in CPU secondary cache applications while eliminating wait states and reducing system-level timing complexity.

FAQ

What is the function of the MODE pin on CY7C1329-100AC?

The MODE pin statically selects the burst address sequence: tied to GND for linear burst (suitable for PowerPC), or tied to VDDQ/floating for interleaved burst (compatible with Intel Pentium). It is sampled once at power-up and must remain static during operation; dynamic switching is not supported.

How does the ZZ sleep mode affect timing behavior?

Asserting ZZ HIGH places the device in snooze mode with IDDZZ ≤ 3 mA. Entry and exit each require exactly two clock cycles (2tCYC), and the device must be deselected (CE1/CE2/CE3 inactive) before ZZ assertion. Data integrity is preserved, but pending accesses are invalidated.

Can CY7C1329-100AC operate with mixed voltage supplies?

No. The device requires strictly 3.3 V ± 0.3 V on both VDD (core) and VDDQ (I/O) rails, with separate VSS (core ground) and VSSQ (I/O ground) connections. Mixing voltages or sharing grounds violates the specified noise isolation and timing margins.

What distinguishes ADSP-initiated versus ADSC-initiated write cycles?

ADSP-triggered writes require two clock cycles: address latched on first CLK, data written on second CLK if GW/BWE active. ADSC-triggered writes complete in one cycle, with address and data handled simultaneously. ADSP has priority when both strobes are asserted.