Chapter 1: Cyclone III Device Data Sheet
1–7
Electrical Characteristics
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.
Table 1–5 lists bus hold specifications for Cyclone III devices.
Table 1–5. Cyclone III Devices Bus Hold Parameter
(Note 1)
V
CCIO (V)
Parameter
Condition
1.2
1.5
1.8
2.5
3.0
3.3
Unit
Min Max Min
Max Min Max Min Max Min Max Min Max
Bus-hold
low,
sustaining
current
VIN > VIL
(maximum)
8
—
—
12
–12
—
—
—
30
–30
—
—
—
50
–50
—
—
—
70
–70
—
—
—
70
–70
—
—
—
μA
μA
μA
Bus-hold
high,
sustaining
current
VIN < VIL
(minimum)
–8
—
Bus-hold
low,
overdrive
current
0 V < VIN < VCCIO
125
–125
175
–175
200
–200
300
500
500
Bus-hold
high,
overdrive
current
0 V < VIN < VCCIO
—
—
—
—
–300
1.7
—
–500
2
—
–500 μA
Bus-holdtrip
point
—
0.3
0.9 0.375 1.125 0.68 1.07 0.7
0.8
0.8
2
V
Note to Table 1–5:
(1) The bus-hold trip points are based on calculated input voltages from the JEDEC standard.
OCT Specifications
Table 1–6 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
VCCIO (V)
Unit
Commercial
Max
Industrial and Automotive
Max
3.0
2.5
1.8
1.5
1.2
30
30
40
40
50
50
50
%
%
%
%
%
Series OCT without
calibration
+40
+50
+50
OCT calibration is automatically performed at device power-up for OCT enabled
I/Os.
© January 2010 Altera Corporation
Cyclone III Device Handbook, Volume 2
ALTERA [ ALTERA CORPORATION ]
