Infineon Technologies CY7C1328G-133AXIT

Overview

CY7C1328G-133AXIT from Cypress Semiconductor is a 4-Mbit (256K × 18) pipelined synchronous SRAM with registered I/O, 133-MHz clock support, 4.0 ns clock-to-output time, 3.3 V core / 3.3 V or 2.5 V I/O supply, and integrated two-bit burst counter for Intel Pentium™-compatible interleaved or linear burst sequences. It serves as high-performance secondary cache in embedded computing systems requiring deterministic timing and depth-expansion capability without wait states.

For engineers reviewing the CY7C1328G-133AXIT datasheet, CY7C1328G-133AXIT pinout, CY7C1328G-133AXIT application, or CY7C1328G-133AXIT equivalent, key selection criteria include synchronous burst control (ADSP/ADSC/ADV), byte-write granularity (BWA/BWB/BWE/GW), ZZ sleep mode implementation, and TQFP-100 package compatibility with JEDEC JESD8-5 I/O voltage levels.

Technical Context

The device implements a dual-strobe synchronous interface with separate processor (ADSP) and controller (ADSC) address strobes, enabling flexible system-level integration in cache-coherent or memory-mapped peripheral subsystems. All address, data, and control inputs are registered on the rising edge of CLK, while outputs pass through output registers synchronized to the same clock edge.

Burst addressing is managed by an on-chip two-bit wraparound counter driven by ADV, with burst order selected statically via MODE pin (interleaved or linear). Write operations are self-timed and support global (GW) or byte-selective (BWA/BWB + BWE) writes, with asynchronous OE and ZZ controls decoupled from the synchronous pipeline.

Key Specifications

Pinout & Package

Package: 100-pin TQFP (14 × 20 × 1.4 mm), RoHS-compliant, Pb-free, JEDEC-standard footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV25616AL-10TLI and MT48LC4M16A2P-6A:G, CY7C1328G-133AXIT uniquely delivers pipelined burst reads/writes with zero-wait-state depth expansion-critical for cache subsystems where timing predictability supersedes raw density or cost.

Availability

CY7C1328G-133AXIT is available at Aetrix Electronics and suitable for secondary cache memory, high-speed buffer interface, processor co-processing module, and industrial motion control buffer applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for CY7C1328G-133AXIT 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 interface ICs and timing-critical applications.

CY7C1328G belongs to Cypress's Pipelined DCD Sync SRAM product line, engineered specifically for deterministic, low-latency cache and buffer roles in x86-compatible and real-time embedded systems requiring burst-mode memory access.

FAQ

What is the correct connection for the ZZ pin on CY7C1328G-133AXIT?

The ZZ pin (Pin 64) must be externally connected to ground per documented errata (Document Number 38-05523 Rev. *P, page 20). Although described as active-high "sleep" input, internal pull-down and silicon behavior require hard grounding for reliable operation; leaving it floating or pulling high causes undefined sleep-state behavior and potential data retention failure.

How does the CY7C1328G-133AXIT support depth expansion without wait states?

It uses a pipelined enable register that delays output buffer disable by one clock cycle after deselect. When multiple devices are depth-expanded using CE2/CE3, this delay ensures continuous bus drive during chip boundary transitions, eliminating the need for wait-state insertion in the memory controller timing design.

Can CY7C1328G-133AXIT operate with 2.5 V I/O while maintaining 3.3 V core supply?

Yes. VDDQ (pins 4, 11, 20, 27, 54, 61, 70, 77) may be supplied at 2.5 V ± 0.2 V independently of VDD (3.3 V ± 0.3 V), enabling direct interfacing with 2.5 V logic families. All I/O pins meet JEDEC JESD8-5 specifications under this dual-rail configuration.

What determines burst order-interleaved vs. linear-and how is it configured?

Burst order is set by the MODE pin (Pin 31): tied to GND for linear burst, tied to VDD or left floating for interleaved burst. This is a static strap configuration-mode must be fixed before initialization and cannot be changed dynamically during operation, aligning with Pentium™ or custom processor burst address expectations.