Cypress Semiconductor Corp CY7C1440KV33-250AXC

Overview

CY7C1440KV33-250AXC from Cypress Semiconductor is a 36-Mbit pipelined synchronous SRAM with on-chip ECC, configured as 1M × 36, operating at 250 MHz with 2.5 ns clock-to-output delay, 3.3 V core supply, and dual-voltage I/O (2.5 V or 3.3 V). It serves as high-speed secondary cache in Pentium-class processor systems requiring burst-mode memory access with error resilience.

For engineers reviewing the CY7C1440KV33-250AXC datasheet, CY7C1440KV33-250AXC pinout, CY7C1440KV33-250AXC application, or CY7C1440KV33-250AXC equivalent, key selection criteria include pipelined burst timing (3-1-1-1), user-selectable interleaved/linear burst mode, synchronous self-timed writes, asynchronous OE/ZZ control, and JEDEC JESD8-5 I/O compatibility.

Technical Context

This SRAM implements a two-bit synchronous wraparound burst counter, registered address/data/control inputs synchronized to CLK's rising edge, and independent ADSP/ADSC strobes for processor/controller interface flexibility. Burst sequencing is determined by the MODE pin state sampled at initialization.

It supports byte-write granularity via four active-low BWx signals qualified by BWE, plus global write (GW) override. On-chip ECC encoder/decoder reduces soft error rate without external logic, and IEEE 1149.1 JTAG boundary scan enables system-level testability.

Key Specifications

Pinout & Package

Package: 100-pin TQFP (Pb-free, RoHS-compliant), 14 × 14 mm body, 0.5 mm pitch. Thermal resistance θ_JA = 42 °C/W (JEDEC Std 51-7).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61WV102436BLL-250BLI and MT28EW128AxxDS-000DA1, CY7C1440KV33-250AXC uniquely combines 250 MHz pipelined operation, hardware ECC, and dual-address-strobe architecture - making it irreplaceable in safety-critical, high-throughput cache designs where deterministic timing and data integrity are non-negotiable.

Availability

CY7C1440KV33-250AXC is available at Aetrix Electronics and suitable for processor cache subsystems, network packet buffers, industrial motion controllers, and avionics data recorders requiring stable component supply across extended product lifecycles.

Supply support for CY7C1440KV33-250AXC 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, microcontrollers, and programmable systems-on-chip for industrial, automotive, and communications markets.

CY7C1440KV33 belongs to Cypress's high-speed synchronous SRAM product line, engineered specifically for low-latency, burst-oriented cache and buffer applications in mission-critical computing platforms.

FAQ

What is the function of the MODE pin on CY7C1440KV33-250AXC?

The MODE pin selects burst address sequence behavior: logic HIGH configures interleaved addressing (compatible with Intel Pentium processors), while logic LOW selects linear addressing. It is sampled once at power-up or reset and remains latched until next reset - no runtime reconfiguration is supported.

Can CY7C1440KV33-250AXC operate with only 2.5 V I/O supply while using 3.3 V core?

Yes. The device supports independent 3.3 V core (VDD) and 2.5 V I/O (VDDQ) supplies simultaneously. All I/O pins (DQx, DQPx, OE, ZZ, etc.) are JESD8-5 compliant and tolerate 2.5 V signaling levels, enabling direct interface with 2.5 V memory controllers without level shifters.

How does the on-chip ECC handle multi-bit errors?

The ECC logic detects all double-bit errors and corrects all single-bit errors per 36-bit word. It does not correct double-bit errors - such events trigger uncorrectable error indication via parity mismatch on DQPx lines. System firmware must implement error logging or failover upon detection.

Is the ZZ sleep mode compatible with asynchronous OE deassertion?

Yes. ZZ and OE operate independently: ZZ controls core power state (reducing ICC to <5 mA), while OE controls I/O driver enable. Both can be asserted simultaneously - resulting in zero I/O current and minimal core leakage, ideal for battery-backed standby modes.