AT16245F データシートの表示（PDF） - Atmel Corporation
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AT16245F Datasheet PDF : 6 Pages
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IOL Pull Down Current
160
120
80
40
0
-40
Time
Ground Bounce for High to Low
Transitions(1)
3.5
gnd - measured on
3.0
output with input
held constant
2.5
2.0
output
1.5
1.0
0.5
VOLP
0.0
VOLV
-0.5
Time
4.0
3.5
IOL
3.0
Output, V
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
Supply Bounce for Low to High
Transitions(2)
4.5
4
3.5
VOHV
3
2.5
2
1.5
1
0.5
0
VOHP
vcc -
measured on
output with
input held
constant
output
Time
Typical Values
Parameter
Value
Units
Note:
VOLP
0.4
V
VOLV
-0.26
V
VOHV
VCC - 0.13
V
VOHP
VCC + 0.6
V
1. When multiple outputs are switched at the same time, rapidly changing current on the ground and VCC paths cause a voltage to
develop across the parasitic inductance of the wire bond and package pins. This occurrence is called simultaneous
switching noise. Atmel’s AT16245 products have minimized this phenomenon as shown on the graph. Output data is for
15 outputs switching simultaneously at a frequency of 1 MHz. The ground data is measured on the one remaining output,
which is set to logic low and will reflect any device ground movement.
2. As on the graph for Ground Bounce, a similar condition occurs for low to high transitions. Output data is for 15 outputs
switching simultaneously at a frequency of 1 MHz. VCC droop is measured on the one remaining output pin, which is set
to a logic high. This output will reflect any movement on the device VCC.
5-12
AT16245
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