Infineon Technologies CY7C1339G-133AXC

Overview

CY7C1339G-133AXC 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, 4.0 ns clock-to-output delay, and support for Intel Pentium™-compatible interleaved or linear burst sequences - used in high-speed secondary cache subsystems for embedded processors and networking controllers.

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

Technical Context

The device implements a two-bit on-chip wraparound burst counter synchronized to CLK, enabling automatic address increment during burst reads/writes. All synchronous inputs - including A[1:0], CE1–CE3, ADSP, ADSC, ADV, GW, BWE, and BW[A:D] - are registered on the rising edge of CLK, while OE and ZZ operate asynchronously.

It supports common I/O architecture with bidirectional DQ[0:31] lines, JEDEC JESD8-5-compatible voltage levels, and separate VDD (3.3 V) and VDDQ (2.5 V or 3.3 V) supplies. Write operations are self-timed and qualified by BWE and byte-select signals, with GW overriding all byte controls for full-word writes.

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 IS61WV12832ALL-133BLI and AS7C3128A-133JCIN, the CY7C1339G-133AXC uniquely delivers configurable burst modes, dual-address-strobe arbitration, and VDDQ voltage flexibility - making it the only option supporting mixed-voltage, low-jitter, multi-master cache interfaces without external timing glue.

Availability

CY7C1339G-133AXC is available at Aetrix Electronics and suitable for high-speed processor cache, network packet buffering, industrial motion control, and medical imaging frame storage requiring stable component supply and long-term lifecycle support.

Supply support for CY7C1339G-133AXC 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 focus on reliability, low power, and interface flexibility.

The CY7C1339G belongs to Cypress's pipelined synchronous SRAM product line, engineered specifically for deterministic, low-latency cache and buffer applications in CPU-, DSP-, and ASIC-based systems operating above 100 MHz.

FAQ

What is the function of the MODE pin on CY7C1339G-133AXC?

The MODE pin selects burst address sequence: tied to GND for linear burst (sequential addresses), or to VDD/floating for Intel Pentium™-compatible interleaved burst (A0–A1 bit-swapped order). It is a static strap pin - must remain unchanged during operation and has an internal pull-up resistor.

Can CY7C1339G-133AXC operate with 2.5 V I/O while using 3.3 V core supply?

Yes. VDD is fixed at 3.3 V for core logic and memory array, while VDDQ accepts either 2.5 V or 3.3 V to match the host processor's I/O voltage. This eliminates need for external level shifters and supports mixed-voltage system designs.

How does the ADSP/ADSC dual-strobe architecture improve system design?

ADSP and ADSC provide independent, synchronous address capture paths - allowing CPU and DMA controller to access the same SRAM without bus arbitration logic. When both are active, ADSP takes priority, enabling clean priority-based resource sharing in real-time systems.

Is the ZZ pin required to be actively driven for sleep mode entry?

No. The ZZ pin has an internal pull-down; leaving it unconnected results in LOW (normal operation). To enter sleep mode, drive ZZ HIGH. In sleep, core current drops to ≤40 mA while data is retained - no clock or refresh needed.