Infineon Technologies CY7C1021B-12VXC

Overview

CY7C1021B-12VXC from Cypress Semiconductor is a 1-Mbit (64K × 16) high-speed CMOS static RAM with 12 ns access time, 5 V ±10% supply, industrial temperature range (–40°C to +85°C), and Pb-free 44-pin SOJ packaging. It supports independent byte write control via BHE/ BLE, automatic CE-based power-down (ISB2 = 10 mA), and operates in embedded microcontroller systems requiring deterministic, non-volatile-critical data buffering.

For engineers reviewing the CY7C1021B-12VXC datasheet, CY7C1021B-12VXC pinout, CY7C1021B-12VXC application, or CY7C1021B-12VXC equivalent, key selection criteria include tAA ≤12 ns read timing, dual-byte enable architecture, industrial-grade thermal performance (θJA = 64.32°C/W), and compatibility with legacy 5 V parallel bus interfaces in avionics and industrial PLCs.

Technical Context

The CY7C1021B-12VXC implements a synchronous, address-decoded 64K × 16 SRAM array with separate row/column decoders and sense amplifiers. Its read/write control logic requires precise timing coordination among CE, OE, WE, BHE, and BLE-each active-low-with overlapping low states defining valid write cycles.

Power management relies on CE-driven automatic transition between active (ICC ≤140 mA) and standby (ISB2 = 10 mA) modes. Input/output pins are tri-stated during deselection (CE HIGH), output disable (OE HIGH), byte disable (BHE/BLE HIGH), or write operations (WE LOW), ensuring clean bus isolation in multi-device systems.

Key Specifications

Pinout & Package

44-pin 400-mil SOJ package with gull-wing leads, 0.050" lead pitch, and JEDEC MO-118AC mechanical outline. Thermal resistance θJA = 64.32°C/W, θJC = 31.03°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed parallel SRAM applications.

Compared with IS61LV102416-12MLI, CY7C1021B-12VXC offers SOJ footprint compatibility and lower standby current, while MC68HC11E9CP fails to meet basic interface and capacity requirements-making CY7C1021B-12VXC the sole viable option for legacy 44-pin SOJ-based 16-bit bus upgrades.

Availability

CY7C1021B-12VXC is available at Aetrix Electronics and suitable for industrial PLC data buffering, avionics flight control memory, and medical imaging frame buffering requiring stable component supply across extended product lifecycles.

Supply support for CY7C1021B-12VXC 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 logic solutions for industrial, automotive, and aerospace applications.

The CY7C1021B series delivers high-speed, low-power parallel SRAMs optimized for deterministic real-time systems where bus timing predictability and thermal stability are critical.

FAQ

What is the maximum operating frequency supported by CY7C1021B-12VXC?

The device does not specify a clock frequency; instead, it defines timing parameters such as tRC = 12 ns (read cycle time) and tWC = 12 ns (write cycle time). These values imply a maximum effective bus transaction rate of approximately 83 MHz under ideal conditions, assuming zero setup/hold overhead and simultaneous signal transitions.

Can CY7C1021B-12VXC operate with a 3.3 V supply?

No. The datasheet specifies VCC = 5 V ±10% only, with absolute maximum ratings limiting VCC to 7.0 V and minimum to 4.5 V. Operation at 3.3 V violates both functional and reliability specifications, and input thresholds (VIH = 2.2 V min) are not guaranteed at reduced VCC.

How does automatic power-down behave when CE is pulsed briefly?

When CE transitions HIGH, the device enters ISB2 standby mode within tPD = 12 ns, drawing ≤10 mA. If CE returns LOW before internal power-down completes, the device resumes active operation without reset or initialization delay-enabling burst-mode low-power operation in interrupt-driven systems.

Are NC pins (22, 23, 28) required to be tied to ground or left floating?

NC pins are not connected to the die and must remain unconnected-neither grounded nor pulled. Routing traces or solder pads to these pins may cause mechanical stress or unintended coupling; best practice is to omit vias/pads entirely per Cypress design guidelines.