Infineon Technologies CY7C1021DV33-10ZSXIT

Overview

CY7C1021DV33-10ZSXIT from Cypress Semiconductor is a 1-Mbit (64 K × 16) high-speed CMOS static RAM with 10 ns access time, 3.3 V supply, industrial/automotive-A temperature range (–40 °C to +85 °C), and automatic CE-controlled power-down. It supports independent byte-wide writes via BHE/BLE inputs and operates in SOJ-44 package for embedded memory buffering in real-time control systems.

For engineers reviewing the CY7C1021DV33-10ZSXIT datasheet, CY7C1021DV33-10ZSXIT pinout, CY7C1021DV33-10ZSXIT application, or CY7C1021DV33-10ZSXIT equivalent, key selection criteria include tAA = 10 ns read timing, ISB2 = 3 mA CMOS standby current, dual-byte enable architecture, and Pb-free SOJ-44 mechanical compatibility with legacy CY7C1021CV33 designs.

Technical Context

The device implements a synchronous, address-decoded 65,536 × 16-bit SRAM array with independent row/column decoding and sense amplifier-based read path. Its automatic power-down logic asserts high-impedance I/Os and reduces ICC to 3 mA when CE is HIGH under CMOS input conditions (VIN > VCC – 0.3 V or VIN < 0.3 V).

Write operations require simultaneous assertion of CE and WE LOW, with byte-selective data latching controlled by BHE (I/O8–I/O15) and BLE (I/O0–I/O7). Read operations require CE and OE LOW while WE remains HIGH, enabling output drivers only when corresponding byte enables are active.

Key Specifications

Pinout & Package

Package: 44-pin 400-mil wide molded SOJ (Small Outline J-Lead), Pb-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar static RAM applications.

Compared with IS61LV102416-10TQLI and AS6C1008-10PCN, CY7C1021DV33-10ZSXIT uniquely delivers pin-compatible byte-enable functionality in SOJ-44, enabling direct replacement in legacy CY7C1021CV33 designs without layout or firmware modification.

Availability

CY7C1021DV33-10ZSXIT is available at Aetrix Electronics and suitable for industrial PLC data buffering, automotive ECU parameter storage, and medical imaging frame buffering requiring stable component supply across extended product lifecycles.

Supply support for CY7C1021DV33-10ZSXIT 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-reliability memory and programmable system-on-chip solutions for industrial, automotive, and aerospace applications.

The CY7C1021DV33 belongs to Cypress's legacy high-speed SRAM product line, engineered specifically for deterministic, low-latency memory interfacing in real-time embedded control systems where power efficiency and thermal robustness are critical.

FAQ

What is the maximum clock frequency supported for continuous read/write cycling?

The device does not use a clock; it is asynchronous. Maximum sustained operation is governed by tRC = 10 ns, enabling up to 100 MHz burst read/write cycles when CE, OE, and WE are driven with appropriate setup/hold timing. No internal PLL or clock multiplier is present-timing is purely combinatorial.

Can CY7C1021DV33-10ZSXIT operate with 2.5 V VCC?

No. The device is specified only for 3.3 V ± 0.3 V (3.0 V to 3.6 V). Operation at 2.5 V violates Absolute Maximum Ratings and will result in undefined behavior, including data corruption and failure to meet tAA = 10 ns. Data retention at 2.0 V applies only during standby, not active operation.

How does automatic power-down behave when CE is held HIGH but BHE/BLE are toggled?

When CE is HIGH, the device enters automatic power-down regardless of BHE/BLE state. All I/Os go high-impedance, ICC drops to ≤3 mA, and internal array is isolated. Toggling BHE/BLE has no effect unless CE is also LOW-byte enables are only sampled during active cycles.

Is the SOJ-44 package compatible with standard reflow soldering profiles?

Yes. The Pb-free SOJ-44 package is qualified for IPC/JEDEC J-STD-020D moisture sensitivity level 3 and supports peak reflow temperatures up to 260 °C for 30 seconds. Recommended profile includes ramp rate ≤3 °C/s, preheat 150–200 °C for 90–120 s, and time above liquidus 217 °C of 60–150 s.