Infineon Technologies CY7C1381KVE33-133AXM

Overview

CY7C1381KVE33 from Cypress Semiconductor is a military-grade 18-Mbit (512K × 36) synchronous flow-through SRAM with on-chip ECC, designed for high-speed secondary cache in radiation-tolerant embedded systems. It supports 133 MHz bus operation with 6.5 ns clock-to-output delay, dual VDD/VDDQ supplies (3.3 V core / 2.5–3.3 V I/O), and operates across –55 °C to +125 °C.

For engineers reviewing the CY7C1381KVE33 datasheet, CY7C1381KVE33 pinout, CY7C1381KVE33 application, or CY7C1381KVE33 equivalent, key selection factors include burst mode configurability (linear/interleaved), synchronous self-timed write, asynchronous OE/ZZ control, JEDEC-compliant 100-pin TQFP packaging, and ECC-enabled soft error resilience in harsh environments.

Technical Context

The CY7C1381KVE33 implements a synchronous flow-through architecture with a 2-bit wraparound burst counter fed by A[1:0], enabling four-word bursts initiated via ADSP or ADSC strobes. All address, data, and control inputs (except OE and ZZ) are registered on the rising edge of CLK.

Burst order is statically selected by the MODE pin (interleaved when HIGH/floating, linear when LOW), while address advancement is controlled by ADV. ECC encoding/decoding occurs on-chip to detect and correct single-bit errors, reducing SER without external logic.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flat Package (TQFP), 14 mm × 20 mm body, 0.5 mm pitch, lead-free per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V2115L133PF and IS61WV102436BLL-133TQLI, the CY7C1381KVE33 uniquely integrates ECC, supports full military temperature operation, and delivers tighter 6.5 ns access time - making it the sole option for high-reliability, radiation-aware cache subsystems.

Availability

CY7C1381KVE33 is available at Aetrix Electronics and suitable for avionics flight control systems, military radar signal processors, downhole oilfield telemetry, and spacecraft onboard computers requiring stable component supply across extended lifecycle programs.

Supply support for CY7C1381KVE33 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 leader in high-reliability memory and programmable solutions for aerospace, defense, and industrial markets.

The CY7C1381KVE33 belongs to Cypress's military-grade synchronous SRAM product line, engineered specifically for radiation-tolerant cache and buffer applications in safety-critical real-time systems.

FAQ

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

The MODE pin selects burst order: HIGH or floating enables interleaved burst (e.g., 00→01→10→11), while LOW (tied to GND) enables linear burst (00→01→10→11). It is a strap pin with internal pull-up and must remain static during operation - dynamic switching is not supported and may cause undefined burst behavior.

How does the ZZ sleep mode interact with ongoing memory accesses?

Asserting ZZ HIGH places the device in sleep mode after two clock cycles, but pending accesses initiated before ZZ assertion are not completed or guaranteed. The device must be fully deselected (CE1/CE2/CE3 inactive) before entering ZZ mode, and requires tZZREC (≥2 CLK cycles) after ZZ returns LOW before resuming valid operations.

Can the CY7C1381KVE33 operate with mixed VDDQ voltages across different banks?

No - VDDQ is a single I/O supply pin shared across all DQ and DQP lines. While the datasheet permits either 2.5 V or 3.3 V, the voltage must be uniform across the entire device; mixing voltages on the same part violates JEDEC compliance and risks I/O contention or latch-up.

Is the ECC capability user-configurable or always active?

ECC is always active and transparent - no enable/disable control exists. Every 36-bit word written includes 4 parity bits generated on-chip; every read performs SEC-DED checking and correction automatically. There is no bypass mode, and ECC cannot be disabled via pins or commands.