ATC13 데이터 시트보기 (PDF) - Atmel Corporation
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ATC13 Datasheet PDF : 12 Pages
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3. Input/Output Pad Cell Libraries, IO12lib and IO33lib
The Atmel Input/Output Cell Library IO12lib contains a comprehensive list of input, out-
put, bi-directional and tristate cells. The ATC13 (1V) cell library includes a special set of
I/O cells, IO33lib, for interfacing with external 3.3V devices.
3.1 Voltage Levels
The IO12lib library is made up exclusively of low-voltage chip interface circuits powered
by a voltage level in the range of 1.1V to 1.32V. The library is compatible with SClib, 1.2-
volt standard cell library.
3.2 Power and Ground Pads
Designers are strongly encouraged to provide three kinds of power pairs for the IO12lib
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; you 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.
You can use the same power pairs to supply both DC power to the I/Os and power to
the core without affecting noise performance.
Table 3-1.
Core
Vssi/gnd
•/ •
•/ •
•/ •
/•
VSS Power Pad Combinations
Switching I/O
Quiet I/O
VssAC
VssDC
•
•
•
•
•
•
•
Library Cell Name
pv12i00
pv12a00
pv12d00
pv12e00
pv12b00
pv12f00
pv12c00
Signal Name
VSS
VSS
VSS
VSS
VSS
VSS
VSS
Table 3-2.
Core
Vddi/vdd
•/ •
•/ •
•/ •
/•
VDD Power Pad Combinations
Switching I/O
Quiet I/O
VddAC
VddDC
•
•
•
•
•
•
•
Library Cell Name
pv12i12
pv12a12
pv12d12
pv12e12
pv12b12
pv12f12
pv12c12
Signal Name
VDD
VDD
VDD
VDD
VDD
VDD
VDD
4 ATC13 Summary
6134AS–CASIC–08-Mar-05
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