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PDF DS2252T Data sheet ( Hoja de datos )
| Número de pieza | DS2252T | |
| Descripción | Secure Microcontroller Module | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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DS2252T
Secure Microcontroller Module
FEATURES
8051-compatible microcontroller for
secure/sensitive applications
- 32, 64, or 128 kbytes of nonvolatile
SRAM for program and/or data storage
- In-system programming via on-chip
serial port
- Capable of modifying its own program or
data memory in the end system
Firmware security features:
- Memory stored in encrypted form
- Encryption using on-chip 64-bit key
- Automatic true random key generator
- SDI (Self-Destruct Input)
- Improved security over previous
generations
- Protects memory contents from piracy
Crashproof operation
- Maintains all nonvolatile resources for
over 10 years in the absence of power
- Power-fail Reset
- Early Warning Power-fail Interrupt
- Watchdog Timer
- Precision reference for power monitor
Fully 8051-compatible
- 128 bytes scratchpad RAM
- Two timer/counters
- On-chip serial port
- 32 parallel I/O port pins
Permanently powered real time clock
PACKAGE OUTLINE
1 20 21
40-Pin SIMM
40
DESCRIPTION
The DS2252T Secure Microcontroller Module is an 8051-compatible microcontroller based on
nonvolatile RAM technology. It is designed for systems that need to protect memory contents from
disclosure. This includes key data, sensitive algorithms, and proprietary information of all types. Like
other members of the Secure Microcontroller family, it provides full compatibility with the 8051
instruction set, timers, serial port, and parallel I/O ports. By using NV RAM instead of ROM, the user can
program, then reprogram the microcontroller while in-system. This allows frequent changing of sensitive
processes with minimal effort. The DS2252T provides an array of mechanisms to prevent an attacker
from examining the memory. It is designed to resist all levels of threat including observation, analysis,
and physical attack. As a result, a massive effort would be required to obtain any information about
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011800
1 page  
PIN
22
35, 37
39
2
24
20
DS2252T
DESCRIPTION
ALE - Address Latch Enable. Used to de-multiplex the multiplexed Expanded
Address/Data bus on Port 0. This pin is normally connected to the clock input on a ’373
type transparent latch.
XTAL2, XTAL1. Used to connect an external crystal to the internal oscillator. XTAL1 is
the input to an inverting amplifier and XTAL2 is the output.
GND - Logic ground.
VCC - +5V.
PROG - Invokes the Bootstrap loader on a falling edge. This signal should be debounced
so that only one edge is detected. If connected to ground, the microcontroller will enter
Bootstrap loading on power up. This signal is pulled up internally.
SDI – Self-Destruct Input. A logic 1 applied to this input causes a hardware unlock. This
involves the destruction of Encryption Keys, Vector RAM, and the momentary removal of
power from VCCO. This pin should be grounded if not used.
INSTRUCTION SET
The DS2252T executes an instruction set that is object code-compatible with the industry standard 8051
microcontroller. As a result, software development packages such as assemblers and compilers that have
been written for the 8051 are compatible with the DS2252T. A complete description of the instruction set
and operation are provided in the User’s Guide section of the Secure Microcontroller Data Book.
MEMORY ORGANIZATION
Figure 2 illustrates the memory map accessed by the DS2252T. The entire 64k of program and 64k of
data are available to the Byte-wide bus. This preserves the I/O ports for application use. An alternate
configuration allows dynamic Partitioning of a 64k space as shown in Figure 3. Any data area not mapped
into the NV RAM is reached via the Expanded bus on Ports 0 and 2. Off-board program memory is not
available for security reasons. Selecting PES=1 provides access to the Real Time Clock as shown in
Figure 4. These selections are made using Special Function Registers. The memory map and its controls
are covered in detail in the User’s Guide section of the Secure Microcontroller Data Book.
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5 Page 
EXPANDED DATA MEMORY WRITE CYCLE
DS2252T
AC CHARACTERISTICS (continued)
EXTERNAL CLOCK DRIVE
# PARAMETER
28 External Clock High Time
@ 12 MHz
@ 16 MHz
29 External Clock Low Time
@ 12 MHz
@ 16 MHz
30 External Clock Rise Time
@ 12 MHz
@ 16 MHz
31 External Clock Fall Time
@ 12 MHz
@ 16 MHz
(tA=0°C to70°C; VCC=5V ± 10%)
SYMBOL MIN
MAX UNITS
tCLKHPW
20
15
ns
ns
tCLKLPW
20
15
ns
ns
tCLKR
20 ns
15 ns
tCLKF
20 ns
15 ns
EXTERNAL CLOCK TIMING
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11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet DS2252T.PDF ] | |
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