ATC35 데이터 시트보기 (PDF) - Atmel Corporation
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ATC35 Datasheet PDF : 14 Pages
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Input/Output Pad Cell
Libraries
IOlib and IO35lib
The Atmel Input/Output Cell Library, IOlib, contains a comprehensive list of input, out-
put, bidirectional and tristate cells. The ATC35 (AT56K) (3.3V) cell library includes a
special set of I/O cells, IO35lib, for interfacing with external 5V devices.
Voltage Levels
The IOlib library is made up exclusively of low-voltage chip interface circuits powered by
a voltage in the range of 3.0V to 3.6V. The library is compatible with the SClib 3-volt
standard cells library.
Power and Ground Pads
Designers are strongly encouraged to provide three kinds of power pairs for the IOlib
library. These are “AC”, “DC” and core power pairs. AC power is used by the I/O to
switch its output from one state to the other. This switching generates noise in the AC
power buses on the chip. DC power is used by the I/O to maintain its output in a steady
state. The best noise performance is achieved when the DC power buses on the chip
are free of noise; designers are encouraged to use separate power pairs for AC and DC
power to prevent most of the noise in the AC power buses from reaching the DC power
buses. The same power pairs can be used to supply both DC power to the I/Os and
power to the core without affecting noise performance.
Table 6. VSS Power Pad Combinations
Core
Switching I/O
Quiet I/O
Vssi
VssAC
VssDC
•
•
•
•
•
•
•
•
•
•
Library Cell
Name
PV0I
PV0A
PV0D
PV0E
PV0B
PV0F
Signal Name
VSS
VSS
VSS
VSS
VSS
VSS
Table 7. VDD Power Pad Combinations
Core
Switching I/O
Quiet I/O
Vddi
VddAC
VddDC
•
•
•
•
•
•
•
•
•
•
Library Cell
Name
PVDI
PVDA
PVDD
PVDE
PVDB
PVDF
Signal Name
VDD
VDD
VDD
VDD
VDD
VDD
4 ATC35 Summary
1063CS–CBIC–01/03
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