Analog Devices DS3660 Product Info

• Memory
  • 1024-Byte Nonimprinting Memory with High-Speed Erase
  • 64 Bytes General-Purpose RAM (Not Cleared)
  • External SRAM Control and Optional Tamper-Event Erasure
  • Segmented Tamper-Detection Memory Hierarchy with Programmable Tamper-Event Sources
• Tamper
  • On-Chip Programmable Temperature Sensing with Proprietary ROC Detector
  • Two General-Purpose Tamper-Detect Logic Inputs
  • Four Uncommitted Tamper-Detect Comparator Inputs
  • Four Window Comparators with On-Chip Reference Voltage
  • Latching and Timestamping of Tamper Events
  • Crystal Oscillator Tamper Monitoring
• Other
  • Low-Voltage Host Microprocessor Interface
  • Programmable Power-Consumption Options for Very Low Standby Current
  • 64-Bit Unique Silicon Serial Number
  • On-Chip Random-Number Generator (RNG)
  • 32-Bit Seconds Counter with Watchdog Timer and Alarm Output
  • CPU Supervisor
  • I²C-Compatible Interface

The DeepCover Security Manager (DS3660) is a security manager with 1024 bytes of SRAM for the secure storage of sensitive data and the physical tamper-sensing response functions required in cryptographic processors and data security equipment. The low-voltage operation allows the host microprocessor interface and optional external memory to run at a low voltage (1.8V typical).

One of the DS3660's primary features is the on-chip nonimprinting memory, consisting of eight 128-byte banks incorporating a high-speed, direct-wired clearing function. The 1KB memory is constantly complemented in the background to prevent memory imprinting of data. The DS3660 architecture allows the user to clear selective banks of the memory based upon specified tamper events. In the event of a qualified tamper event, the desired bank(s) of memory are rapidly cleared and a negative bias can be applied to erase external memory.

The DS3660 includes a seconds counter, watchdog timer, CPU supervisor, nonvolatile (NV) SRAM controller, and on-chip temperature sensor. In the event of a primary power failure, an external battery source is automatically switched in to keep the memory, time, and tamper-detection circuitry active. Optionally, an internal 1.8V bias source can be selected to keep a low-voltage SRAM alive. The DS3660 is configurable to operate with a low-voltage mobile host microprocessor interface for embedded battery-operated devices. The DS3660 provides low-leakage tamper-detection inputs for interface to external sensors, interlocks, and antitamper meshes. The DS3660 also invokes a tamper event on absolute temperature, if the temperature rate-of-change (ROC) exceeds programmed limits, or if the crys