EP3C5E144C8N Datasheet, PDF (319/348 Pages) Altera Corporation – Ability to disable external JTAG port

Chapter 2: Cyclone III LS Device Data Sheet
2–5
Electrical Characteristics
Supply Current
Supply 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 you use. Table 2–4 lists the I/O pin
leakage current for Cyclone III LS 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 2–4. Cyclone III LS Devices I/O Pin Leakage Current ^{(1), (2)}
Symbol
Parameter
Conditions
Min
Typ
Max Unit
I_I
Input Pin Leakage Current V_I = V_CCIOMAX to 0 V –10
—
10
μA
I_OZ
Tri-stated I/O Pin Leakage V_O = V_CCIOMAX to 0
Current
V
–10
—
10
μA
Notes to Table 2–4:
(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) The 10 μA I/O leakage current limit is applicable when the internal clamping diode is off. A higher current can be
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 2–5 lists the bus hold specifications for Cyclone III LS devices. Also listed are the
input pin capacitances and OCT tolerance specifications.
Table 2–5. Cyclone III LS Devices Bus Hold Parameters ⁽¹⁾
V_CCIO (V)
Parameter Condition
1.2
1.5
1.8
2.5
3.0
3.3 Unit
Bus-hold
low,
sustaining
current
Bus-hold
high,
sustaining
current
Bus-hold
low,
overdrive
current
V_IN > V_IL
(maximum)
V_IN < V_IL
(minimum)
0 V < V_IN <
V_CCIO
Min Max Min Max Min Max Min Max Min Max Min Max
8 — 12 — 30 — 50 — 70 — 70 — μA
–8 — –12 — –30 — –50 — –70 — –70 — μA
— 125 — 175 — 200 — 300 — 500 — 500 μA
December 2011 Altera Corporation
Cyclone III Device Handbook
Volume 2