Infineon Technologies CY7C1338G-100AXCT

Overview

CY7C1338G-100AXCT from Cypress Semiconductor is a 4-Mbit (128K × 32) flow-through synchronous SRAM with 100-MHz clock support, 8.0 ns clock-to-output delay, 3.3 V core supply (VDD), and dual-voltage I/O (2.5 V/3.3 V VDDQ), designed for secondary cache interfacing in high-speed microprocessor systems including Pentium-class architectures.

For engineers reviewing the CY7C1338G-100AXCT datasheet, CY7C1338G-100AXCT pinout, CY7C1338G-100AXCT application, or CY7C1338G-100AXCT equivalent, key selection criteria include burst mode configuration (linear vs. interleaved), synchronous self-timed write capability, separate ADSP/ADSC address strobes, ZZ sleep mode behavior, and TQFP-100 package compatibility with JEDEC JESD8-5 I/O standards.

Technical Context

The device implements a 2-bit on-chip wraparound burst counter fed by A[1:0], enabling automatic address increment during burst reads/writes. All synchronous inputs-including addresses, CE1/CE2/CE3, ADSP/ADSC, ADV, GW, BWE, and BW[A:D]-are registered on the rising edge of CLK.

Asynchronous controls include OE (tri-state output enable) and ZZ (sleep mode input, requiring external ground per errata). MODE is a static strap pin selecting linear (LOW) or interleaved (HIGH) burst sequences, directly supporting Intel Pentium™ and i486™ processor timing protocols.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flat Package (TQFP), 14 mm × 20 mm × 1.4 mm body, lead-free (Pb-free) construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV12832AL-100TQLI and MT48LC16M32B2-75:G, CY7C1338G-100AXCT delivers guaranteed 8.0 ns tC0, native burst support, and hardware-controlled sleep-critical for cache subsystems demanding zero-jitter, low-latency, and power-aware operation.

Availability

CY7C1338G-100AXCT is available at Aetrix Electronics and suitable for Intel Pentium™-based embedded computing, industrial real-time controllers, telecom line card buffers, and avionics data acquisition modules requiring stable component supply and long-lifecycle support.

Supply support for CY7C1338G-100AXCT 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 expertise in timing-critical SRAM, PSoC® platforms, and automotive-grade ICs.

CY7C1338G belongs to Cypress's legacy synchronous SRAM product line, engineered specifically for secondary cache applications in high-speed microprocessor systems requiring deterministic timing, burst efficiency, and low-power sleep modes.

FAQ

What is the correct connection for the ZZ pin on CY7C1338G-100AXCT?

The ZZ pin (Pin 64) must be externally connected to ground per documented errata (page 20 of Rev. *P datasheet). Although described as active-HIGH sleep input, leaving it floating or pulling it HIGH causes undefined behavior. Internal pull-down ensures safe default, but grounding is mandatory for reliable operation.

Can CY7C1338G-100AXCT operate with 2.5 V I/O while using 3.3 V core supply?

Yes. The device supports independent VDD (3.3 V) and VDDQ (2.5 V or 3.3 V) supplies. VDDQ powers only the I/O circuitry and DQ pins, allowing direct interface to 2.5 V logic families while maintaining full 3.3 V core functionality and timing performance.

How does the MODE pin affect burst addressing behavior?

MODE is a static strap pin sampled at power-up or reset. When LOW (tied to GND), it configures linear burst order (0,1,2,3); when HIGH (tied to VDD or left floating), it selects interleaved order (0,2,1,3) matching Intel Pentium™ processors. It must remain stable during operation to avoid burst corruption.

What is the role of ADSP versus ADSC in cache control?

ADSP (processor address strobe) initiates accesses driven by the CPU; ADSC (controller address strobe) enables cache coherency logic or DMA controllers to initiate bursts independently. When both are asserted, ADSP takes priority. CE1 must be active for either to function, and ADSP is ignored if CE1 is deasserted.