Infineon Technologies CY7C1338G-100AXC

Overview

CY7C1338G-100AXC from Cypress Semiconductor is a 4-Mbit (128K × 32) flow-through synchronous SRAM with 3.3 V core supply, 2.5/3.3 V I/O supply, and 8.0 ns clock-to-output delay at 100 MHz. It supports Intel Pentium™-compatible interleaved or linear burst sequences via MODE pin selection, features synchronous self-timed write, asynchronous OE, and ZZ sleep mode - deployed in high-speed CPU cache subsystems requiring deterministic timing and low-latency burst access.

For engineers reviewing the CY7C1338G-100AXC datasheet, CY7C1338G-100AXC pinout, CY7C1338G-100AXC application, or CY7C1338G-100AXC equivalent, key selection criteria include burst sequence control (MODE), dual address strobe support (ADSP/ADSC), byte-write granularity (BWA–BWD + BWE), synchronous clock interface (CLK), and TQFP-100 package compatibility with JEDEC JESD8-5 I/O standards.

Technical Context

The CY7C1338G-100AXC 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, BW[A:D], BWE, GW, and CLK - are registered on the rising edge of CLK, ensuring precise timing alignment with microprocessor buses.

It supports two distinct burst modes: interleaved (MODE = HIGH) for Pentium/i486™ systems and linear (MODE = LOW) for modern controllers; burst initiation is selectable between processor-driven (ADSP) and controller-driven (ADSC) strobes, with ADV controlling internal address advancement. The device maintains data integrity in ZZ sleep mode while reducing standby current to 40 mA.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flat Package (TQFP), 14 mm × 20 mm × 1.4 mm body, lead pitch 0.5 mm, RoHS-compliant Pb-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV25616AL-10TLI and MT48LC4M32B2-6A:J, the CY7C1338G-100AXC uniquely delivers deterministic 8.0 ns flow-through timing, integrated burst sequencing, and dual-strobe support - making it irreplaceable in CPU cache and real-time burst-buffer applications where latency predictability is mandatory.

Availability

CY7C1338G-100AXC is available at Aetrix Electronics and suitable for CPU cache subsystems, Pentium™-compatible embedded controllers, and real-time DSP data buffers requiring stable component supply, long-lifecycle availability, and Pb-free RoHS compliance.

Supply support for CY7C1338G-100AXC 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 synchronous SRAM, NOR flash, and PSoC architectures.

The CY7C1338G belongs to Cypress's legacy synchronous SRAM product line, engineered specifically for secondary cache and high-speed buffer applications in x86 and DSP-based systems demanding sub-10 ns access and deterministic burst behavior.

FAQ

What is the required connection for the ZZ pin on CY7C1338G-100AXC?

The ZZ pin (Pin 64) must be externally connected to ground per documented errata on page 20 of Rev. *P datasheet. Although described as active-HIGH sleep input, internal design requires grounding to ensure reliable operation and avoid undefined states. Leaving it floating or pulling HIGH violates the errata correction and may cause functional instability.

Can CY7C1338G-100AXC operate with 2.5 V on both VDD and VDDQ?

No. The core supply VDD must be 3.3 V ±0.3 V; only VDDQ supports 2.5 V or 3.3 V. Applying 2.5 V to VDD violates absolute maximum ratings and will result in improper internal logic operation, failed address registration, or complete functional failure. VDD and VDDQ are electrically isolated power domains.

How does burst addressing work when MODE = HIGH versus MODE = LOW?

When MODE = HIGH, the device executes interleaved bursts (e.g., 0→2→4→6 for A[1:0] = 00), matching Pentium™ 2-1-1-1 access patterns. When MODE = LOW, it executes linear bursts (0→1→2→3). The 2-bit counter wraps automatically; both modes use ADV to trigger increments and require ADSP/ADSC to load the initial address on CLK rise.

Is CY7C1338G-100AXC pin-compatible with other Cypress synchronous SRAMs like CY7C1339G?

No. CY7C1339G is a 128K × 16 device in 100-pin TQFP but with different pin assignments for data width (16-bit vs. 32-bit), altered CE/ADV signal placement, and no ZZ pin. Direct replacement would require PCB redesign due to incompatible I/O mapping, byte-width, and control signal routing.