Chapter 1: Cyclone III Device Data Sheet
Electrical Characteristics
1–7
Bus Hold
Bus hold retains the last valid logic state after the source driving it either enters the
high impedance state or is removed. Each I/O pin has an option to enable bus hold in
user mode. Bus hold is always disabled in configuration mode.
lists bus hold specifications for Cyclone III devices.
Table 1–5.
Cyclone III Devices Bus Hold Parameter
V
CC IO
(V)
Parameter
Condition
Min
Bus-hold
low,
sustaining
current
Bus-hold
high,
sustaining
current
Bus-hold
low,
overdrive
current
Bus-hold
high,
overdrive
current
Bus-hold trip
point
Note to
(1) The bus-hold trip points are based on calculated input voltages from the JEDEC standard.
1.2
Max
Min
1.5
Max
Min
1.8
Max
Min
2.5
Max
3.0
Min
Max
3.3
Min
Max
Unit
V
IN
> V
IL
(maximum)
8
—
12
—
30
—
50
—
70
—
70
—
μA
V
IN
< V
IL
(minimum)
–8
—
–12
—
–30
—
–50
—
–70
—
–70
—
μA
0 V < V
IN
< V
CC IO
—
125
—
175
—
200
—
300
—
500
—
500
μA
0 V < V
IN
< V
CC IO
—
–125
—
–175
—
–200
—
–300
—
–500
—
–500
μA
—
0.3
0.9
0.375 1.125
0.68
1.07
0.7
1.7
0.8
2
0.8
2
V
OCT Specifications
lists the variation of OCT without calibration across process, temperature,
and voltage.
Table 1–6.
Cyclone III Devices Series OCT without Calibration Specifications
Resistance Tolerance
Description
V
CCIO
(V)
3.0
2.5
Series OCT without
calibration
1.8
1.5
1.2
Commercial
Max
±30
±30
+40
+50
+50
Industrial and Automotive
Max
±40
±40
±50
±50
±50
Unit
%
%
%
%
%
OCT calibration is automatically performed at device power-up for OCT enabled
I/Os.
© January 2010
Altera Corporation
ALTERA [ ALTERA CORPORATION ]
