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| 型號(hào)： | 21045 |
| 英文描述： | Using the 3.3-V Am186ER or Am188ER Microcontroller in a 5-V System Application Note? 28.2KB (PDF) |
| 中文描述： | 使用5 V系統(tǒng)應(yīng)用指南3.3 V的Am186ER或Am188ER微控制器？ 28.2KB（PDF格式） |
| 文件頁(yè)數(shù)： | 3/3頁(yè) |
| 文件大?。?/td> | 28K |
| 代理商： | 21045 |
Using the 3.3-V Am186
ER or Am188
ER Microcontroller in a 5-V System
3
Further improvement could be gained when using the
5-V device by adding some large (>.050”) holes around
the periphery of the split plane, in pairs, to allow the two
planes to be reconnected.
Finally, while the signal pins on the Am186ER control-
ler are 5-V tolerant during normal operation of the part,
they are dependent on the actual level of V
cc
. The sig-
nal pins can tolerate a V
ih
of V
cc
+2.6 V. This must be
considered during system power-up and any other time
that the system V
cc
becomes unstable. If the method of
voltage regulation chosen does not adequately track
the 5-V power supply or if a 5-V peripheral drives the
signal pins of the Am186ER controller to a level greater
than 2.6 V above the processor power supply voltage,
then damage can occur. To protect the microcontroller,
all pull-up resistors should be connected to the 3.3-V
power source. Remember to include the pull-ups when
doing evaluation of the current requirements for the
regulator.
Additionally, all peripherals should be held in RESET
until the power is stable on both the 5-V and 3.3-V
power planes. If a peripheral can not be placed in a
RESET state that guarantees it will not drive any sig-
nals, then additional measures such as tristate buffers
must be included in the design.
SUMMARY
The use of 3.3-V technology for high-speed microcon-
trollers is beneficial in many ways: better chip fabrica-
tion processes, faster clock speeds, lower EMI, and
lower power consumption.
Operation of the Am186ER in a 5-V technology system
should be trouble-free. 3.3-V LDO regulators make
powering the device easy. Decouple the device care-
fully, and consider a split power plane, for the 3.3-V
supply.
REFERENCES
Am186ER Microcontroller Data Sheet
, order# 20732,
Advanced Micro Devices.
High Speed Board Design Techniques
, order# 16356
(also in order# 10173), Advanced Micro Devices.
Table 1.
Manufacturers
Trademarks
Copyright 1996 Advanced Micro Devices, Inc. All rights reserved.
AMD and the AMD logo are registered trademarks of Advanced Micro Devices, Inc. The combination of AMD and the AMD logo, Am186, and
Am188 are trademarks of Advanced Micro Devices, Inc.
Product names used in this publication are for identification purposes only and may be trademarks of their respective companies.
Manufacturer
Main Number
Distributors
Linear Technology
(408) 432-1900
Arrow, Insite
Maxim
(408) 737-7600
Arrow, Wyle, Pioneer
Micrel
(408) 944-0800
N/A
Micro Linear
(408) 433-5200
Insite
Motorola Semiconductor n/a
Arrow, Future, Hamilton/Hallmark
National Semiconductor
n/a
Anthem, Hamilton/Hallmark, Pioneer, Time
Philips
(401) 232-0500
Hamilton/Hallmark, Bell
Power Trends
(708) 406-0900
Hamilton/Hallmark
Rohm
(205) 464-0490
Jaco, Kent, Sterling
Semtech
(805) 498-2111
N/A
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