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Chapter 1: Cyclone III Device Datasheet
1–5
Electrical Characteristics
DC Characteristics
This section lists the I/O leakage current, pin capacitance, on-chip termination (OCT)
tolerance, and bus hold specifications for Cyclone III devices.
Supply Current
Standby current is the current the device draws after the device is configured with no
inputs or outputs toggling and no activity in the device. Use the Excel-based early
power estimator (EPE) to get the supply current estimates for your design because
these currents vary largely with the resources used. Table 1–4 lists I/O pin leakage
current for Cyclone III devices.
f For more information about power estimation tools, refer to the PowerPlay Early Power
Estimator User Guide and the PowerPlay Power Analysis chapter in the Quartus II
Handbook .
Table 1–4. Cyclone III Devices I/O Pin Leakage Current (1) ,
(2)
Symbol
I I
I OZ
Parameter
Input pin leakage current
Tristated I/O pin leakage
current
Conditions
V I = 0 V to V CCIOMAX
V O = 0 V to V CCIOMAX
Min
–10
–10
Typ
—
—
Max
10
10
Unit
? A
? A
Notes to Table 1–4 :
(1) This value is specified for normal device operation. The value varies during device power-up. This applies for all
V CCIO settings (3.3, 3.0, 2.5, 1.8, 1.5, and 1.2 V).
(2) 10 ? A I/O leakage current limit is applicable when the internal clamping diode is off. A higher current can be the
observed when the diode is on.
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
(Part 1 of 2)
(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
V IN > V IL
(maximum)
8
—
12
—
30
—
50
—
70
—
70
—
? A
current
Bus-hold
high,
sustaining
V IN < V IL
(minimum)
–8
—
–12
—
–30
—
–50
—
–70
—
–70
—
? A
current
July 2012
Altera Corporation
Cyclone III Device Handbook
Volume 2
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