Chapter 1: Cyclone III Device Data Sheet

1–7

Electrical Characteristics

© January 2010

Altera Corporation

Cyclone III Device Handbook, Volume 2

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.

OCT Specifications

Table 1–6 lists the variation of OCT without calibration across process, temperature,

and voltage.

OCT calibration is automatically performed at device power-up for OCT enabled

I/Os.

Table 1–5. Cyclone III Devices Bus Hold Parameter

(Note 1)

Parameter

Condition

V

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

V

(maximum)

8

—

12

—

30

—

50

—

70

—

70

—

μA

Bus-hold

high,

sustaining

current

V

(minimum)

–8

—

–12

—

–30

—

–50

—

–70

—

–70

—

μA

Bus-hold

low,

overdrive

current

0 V < V

—

125

—

175

—200

—300

—500

—

500

μA

Bus-hold

high,

overdrive

current

0 V < V

—

–125

—

–175

—

–200

—

–300

—

–500

—

–500

μA

Bus-hold trip

point

—

0.3

0.9

0.375

1.125

0.68

1.07

0.7

1.7

0.8

2

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.

Table 1–6. Cyclone III Devices Series OCT without Calibration Specifications

Description

V

Resistance Tolerance

Unit

Commercial

Max

Industrial and Automotive

Max

Series OCT without

calibration

3.0

±30

±40

%

2.5

±30

±40

%

1.8

+40

±50

%

1.5

+50

±50

%

1.2

+50

±50

%