Infineon Technologies CY7C1361KVE33-133AXI

Overview

CY7C1361KVE33-133AXI from Cypress Semiconductor is a 9-Mbit (256K × 36) synchronous flow-through SRAM designed for high-speed secondary cache in Pentium-class microprocessor systems. It supports 133 MHz bus operations, delivers 6.5 ns clock-to-output delay, operates on 3.3 V core supply (VDD) with selectable 2.5 V/3.3 V I/O (VDDQ), and implements user-selectable linear or interleaved burst sequences via the MODE pin.

For engineers reviewing the CY7C1361KVE33-133AXI datasheet, CY7C1361KVE33-133AXI pinout, CY7C1361KVE33-133AXI application, or CY7C1361KVE33-133AXI equivalent, key selection criteria include synchronous burst timing compliance, dual-voltage I/O flexibility, ZZ sleep mode support, and TQFP-100 package compatibility with legacy Pentium cache controller interfaces.

Technical Context

The device uses a positive-edge-triggered CLK to register all synchronous inputs-including address (A[1:0]), chip enables (CE1/CE2/CE3), burst controls (ADSP/ADSC/ADV), and write enables (BWX/BWE/GW). A 2-bit on-chip wraparound burst counter captures initial address bits and auto-increments for subsequent burst cycles.

Burst order is statically selected by the MODE pin: HIGH (or floating) enables Intel Pentium-style interleaved addressing; LOW selects linear sequence. Asynchronous OE enables output tristating independent of clock, while ZZ provides non-time-critical sleep with data retention and internal pull-down.

Key Specifications

Pinout & Package

Package: 100-pin TQFP (14 × 20 × 1.4 mm), lead-free, RoHS-compliant, with dedicated VDD/VSS and VDDQ/VSSQ power/ground pairs for noise isolation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV25636A-133TQLI and AS7C325636A-133BIN, CY7C1361KVE33-133AXI uniquely combines 133 MHz timing, dual-voltage I/O, and asynchronous sleep-making it the only option for power-constrained, mixed-voltage Pentium cache designs requiring guaranteed 6.5 ns performance.

Availability

CY7C1361KVE33-133AXI is available at Aetrix Electronics and suitable for Intel Pentium L2 cache subsystems, high-speed network packet buffers, and industrial motion controller FIFOs requiring stable component supply across extended product lifecycles.

Supply support for CY7C1361KVE33-133AXI 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 high-performance memory, PSoC programmable systems-on-chip, and USB/USB-C solutions.

The CY7C1361KVE33 belongs to Cypress's synchronous SRAM product line, engineered specifically for low-latency, burst-mode cache and buffer applications in x86-compatible and real-time embedded systems.

FAQ

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

The MODE pin selects burst address sequence: HIGH (or floating) enables interleaved addressing per Intel Pentium specification; LOW selects linear sequence. It is a static strap pin-must be set before operation and held stable during all accesses. Internal pull-up ensures default interleaved behavior if left unconnected.

Can CY7C1361KVE33-133AXI operate with 2.5 V I/O while using 3.3 V core supply?

Yes. VDD is fixed at 3.3 V ±5%/+10%, while VDDQ accepts either 2.5 V or 3.3 V. This allows direct interfacing with 2.5 V logic families (e.g., ASICs or FPGAs) without level shifters, while maintaining core stability at 3.3 V.

How does the ZZ sleep mode affect timing and data retention?

When ZZ is driven HIGH, the device enters non-time-critical sleep: core clocks halt, I/Os go high-impedance, and standby current drops significantly-but all stored data is retained. Exit to active mode requires ZZ LOW followed by one valid clock cycle before new accesses are accepted.

What is the role of ADSP versus ADSC, and when is each used?

ADSP signals processor-initiated bursts (e.g., CPU cache fill); ADSC signals controller-initiated bursts (e.g., DMA or cache controller prefetch). ADSP has priority-if both are active, only ADSP is recognized. Both are sampled synchronously on CLK rise and require CE1–CE3 active to latch addresses.