Infineon Technologies CY7C1339G-133AXCT

Overview

CY7C1339G-133AXCT from Cypress Semiconductor is a 4-Mbit (128 K × 32) pipelined synchronous SRAM with registered I/O, 3.3 V core supply, 2.5/3.3 V I/O supply, and 4.0 ns clock-to-output delay at 133 MHz. It supports Intel Pentium™-compatible interleaved or linear burst sequences via MODE pin selection and enables high-speed secondary cache in embedded processor systems.

For engineers reviewing the CY7C1339G-133AXCT datasheet, CY7C1339G-133AXCT pinout, CY7C1339G-133AXCT application, or CY7C1339G-133AXCT equivalent, key selection criteria include burst mode configuration (MODE), byte-write granularity (BWA–BWD + BWE), synchronous self-timed write control (GW/BWE), and dual-strobe address capture (ADSP/ADSC).

Technical Context

The device implements a two-bit on-chip wraparound burst counter synchronized to CLK's rising edge, with address latching controlled by ADSP (processor strobe) or ADSC (controller strobe). Burst sequence direction-interleaved (MODE = VDD/floating) or linear (MODE = GND)-is statically configured and retained during operation.

All synchronous inputs (addresses, CE1/CE2/CE3, ADV, BW[A:D], BWE, GW) are registered on CLK rise; asynchronous OE and ZZ control output enable and sleep mode independently of clock timing. Output data is registered and delivered within tCO = 4.0 ns (133 MHz grade), with tri-state behavior enforced during deselected cycles and automatic DQ tri-state during writes regardless of OE state.

Key Specifications

Pinout & Package

Available in lead-free 100-pin TQFP (14 × 20 × 1.4 mm) package. Pin functions validated per Cypress Document Number 38-05520 Rev. *J.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV25616AL-10TLI, CY7C1339G-133AXCT delivers pipelined burst performance essential for CPU cache; versus CY7C1353G-133AXC, it doubles memory depth while maintaining identical timing, power, and interface compatibility-making it optimal for bandwidth-critical upgrades.

Availability

CY7C1339G-133AXCT is available at Aetrix Electronics and suitable for PC motherboard cache, industrial PLC memory buffers, network router packet buffers, and military avionics data loggers requiring stable component supply across extended product lifecycles.

Supply support for CY7C1339G-133AXCT 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 memory, microcontrollers, and programmable solutions for embedded systems.

The CY7C1339G belongs to Cypress's high-speed synchronous SRAM product line, designed specifically for secondary cache and high-bandwidth buffer applications in x86, PowerPC, and MIPS-based computing platforms.

FAQ

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

The MODE pin selects burst sequence type: tied to GND for linear burst, or to VDD/floating for interleaved burst. It is a static strap pin with internal pull-up; must remain stable during operation and cannot be toggled dynamically. Incorrect MODE configuration causes misaligned burst addresses and data corruption in cache line fills.

How does the CY7C1339G-133AXCT handle simultaneous ADSP and ADSC assertion?

When both ADSP and ADSC are asserted LOW, the device recognizes only ADSP and ignores ADSC. This priority scheme ensures processor-initiated accesses take precedence in multi-master systems. CE1 must also be active for ADSP to be accepted; if CE1 is HIGH, ADSP is masked regardless of ADSC state.

Can the ZZ sleep mode be entered during active burst operations?

Yes-ZZ is asynchronous and can be asserted HIGH at any time, including mid-burst. The device immediately enters sleep mode, halting all internal clocks and reducing current to 40 mA while preserving memory contents. No special handshake or timing sequence is required; data integrity remains guaranteed throughout sleep entry and exit.

What is the role of the ADV signal during a single (non-burst) access?

ADV is ignored during single-access cycles. It only affects burst operations: when ADV is asserted LOW on CLK rise, it increments the internal 2-bit burst counter to generate the next sequential or interleaved address. In single reads/writes, address advancement is disabled, and ADV has no functional impact on timing or data flow.