Infineon Technologies CY7C1381KV33-133AXC

Overview

CY7C1381KV33-133AXC from Cypress Semiconductor is a 18-Mbit synchronous flow-through SRAM with on-chip ECC, configured as 512K × 36 common I/O, supporting 133 MHz bus operations with 6.5 ns clock-to-output delay. It operates from a 3.3 V core supply (VDD) and 2.5 V/3.3 V I/O supply (VDDQ), and features interleaved/linear burst modes, JTAG boundary scan, and ZZ sleep mode - deployed in high-speed cache and memory subsystems for telecom line cards and network processors.

For engineers reviewing the CY7C1381KV33-133AXC datasheet, CY7C1381KV33-133AXC pinout, CY7C1381KV33-133AXC application, or CY7C1381KV33-133AXC equivalent, key selection criteria include burst address sequencing (MODE pin), synchronous write timing with ADSP/ADSC strobes, ECC-enabled soft error resilience, and compatibility with JEDEC-standard 100-pin TQFP packaging.

Technical Context

This SRAM implements a synchronous, flow-through architecture with dual address strobe inputs (ADSP and ADSC), enabling seamless integration with both processor and cache controller interfaces. All address, data, and control inputs (except OE and ZZ) are registered on the rising edge of CLK, and internal 2-bit burst counter increments addresses automatically during burst sequences.

Burst order is statically selected via MODE pin (interleaved when HIGH, linear when LOW); byte writes are controlled by four active-low BWx signals qualified by BWE, while global write is enabled by GW. On-chip ECC encoder/decoder reduces soft error rate without external logic overhead.

Key Specifications

Pinout & Package

Package: 100-pin TQFP (14 × 20 × 1.4 mm), RoHS-compliant, lead-free, with exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61WV102432BLL-133BLI and MT28EW128AABA1HCS-0SIT, CY7C1381KV33-133AXC uniquely combines true synchronous flow-through timing, hardware ECC, and dual-voltage I/O in a drop-in 100-pin TQFP package - essential for deterministic real-time systems where latency predictability and radiation tolerance are non-negotiable.

Availability

CY7C1381KV33-133AXC is available at Aetrix Electronics and suitable for telecom infrastructure, network processor design, industrial motion control, and radar signal processing requiring stable component supply and long-term lifecycle assurance.

Supply support for CY7C1381KV33-133AXC 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 demanding embedded and communications applications.

The CY7C1381K series targets high-speed, ECC-protected memory subsystems in mission-critical networking and industrial equipment - emphasizing deterministic timing, radiation-hardened reliability, and seamless microprocessor coherency.

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, due to internal pull-up) enables interleaved burst; LOW (tied to GND) enables linear burst. It is a static strap pin - must be fixed before operation and cannot be changed dynamically. Incorrect configuration causes misaligned burst reads/writes and data corruption.

Does CY7C1381KV33-133AXC support both 2.5 V and 3.3 V I/O simultaneously?

No - VDDQ is a single supply pin that must be set to either 2.5 V or 3.3 V, not both. The device supports interface to either voltage domain, but all DQ/DQP pins share the same VDDQ rail. Mixing voltages on VDDQ violates absolute maximum ratings and risks latch-up.

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

When ZZ is driven HIGH, the device enters a non-time-critical sleep state with full data retention and reduced ICC. All outputs go high-impedance, clocks are ignored, and internal logic halts - but memory cell contents remain intact. Exit time from ZZ is asynchronous and requires no setup; data is valid within tZZD (max 20 ns) after ZZ returns LOW.

Can ADSP and ADSC be used concurrently, and what happens if both are asserted?

No - ADSP and ADSC are mutually exclusive. When both are asserted LOW, the device recognizes only ADSP and ignores ADSC. This priority ensures deterministic behavior in systems where both processor and controller may attempt address capture; designers must ensure only one strobe is active per cycle to avoid ambiguous address latching.