Chapter 1: Cyclone IV Device Datasheet

1–7

Operating Conditions

May 2013

Altera Corporation

Cyclone IV Device Handbook,

Volume 3

DC Characteristics

This section lists the I/O leakage current, pin capacitance, on-chip termination (OCT)

tolerance, and bus hold specifications for Cyclone IV devices.

Supply Current

The device supply current requirement is the minimum current drawn from the

power supply pins that can be used as a reference for power size planning. Use the

Excel-based early power estimator (EPE) to get the supply current estimates for your

design because these currents vary greatly with the resources used. Table 1–6 lists the

I/O pin leakage current for Cyclone IV devices.

Bus Hold

The 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 1–7 lists bus hold specifications for Cyclone IV devices.

Table 1–6. I/O Pin Leakage Current for Cyclone IV Devices (1), (2)

Symbol

Parameter

Conditions

Device

Min

Typ

Max

Unit

Input pin leakage current

—–10

—

10

A

Tristated I/O pin leakage

current

—–10

—

10

A

Notes to Table 1–6:

(1) This value is specified for normal device operation. The value varies during device power

1.8, 1.5, and 1.2 V).

(2) The 10

A 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.

Table 1–7. Bus Hold Parameter for Cyclone IV Devices (Part 1 of 2) (1)

Parameter

Condition

Unit

1.2

1.5

1.8

2.5

3.0

3.3

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

Bus hold

low,

sustaining

current

(maximum)

8

—

12

—

30

—

50

—

70

—

70

—

A

Bus hold

high,

sustaining

current

(minimum)

–8

—

–12

—

–30

—

–50

—

–70

—

–70

—

A

Bus hold

low,

overdrive

current

—

125

—

175

—200

—300

—500

—

500

A

Bus hold

high,

overdrive

current

—

–125

—

–175

—

–200

—

–300

—

–500

—

–500

A