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Chapter 1: Cyclone III Device Datasheet

1–9

Electrical Characteristics

July 2012

Altera Corporation

Cyclone III Device Handbook

Volume 2

Internal Weak Pull-Up and Weak Pull-Down Resistor

Table 1–10 lists the weak pull-up and pull-down resistor values for Cyclone III

devices.

Hot Socketing

Table 1–11 lists the hot-socketing specifications for Cyclone III devices.

Table 1–10. Cyclone III Devices Internal Weak Pull-Up and Weak Pull-Down Resistor (1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

R_PU

Value of I/O pin pull-up resistor before

and during configuration, as well as

user mode if the programmable

pull-up resistor option is enabled

VCCIO = 3.3 V ± 5% (2), (3)

725



VCCIO = 3.0 V ± 5% (2), (3)

728



VCCIO = 2.5 V ± 5% (2), (3)

835



VCCIO = 1.8 V ± 5% (2), (3)

108



VCCIO = 1.5 V ± 5% (2), (3)

163



VCCIO = 1.2 V ± 5% (2), (3)

143

351



R_PD

Value of I/O pin pull-down resistor

before and during configuration

VCCIO = 3.3 V ± 5% (4)

619



VCCIO = 3.0 V ± 5% (4)

622



VCCIO = 2.5 V ± 5% (4)

625



VCCIO = 1.8 V ± 5% (4)

735



VCCIO = 1.5 V ± 5% (4)

850

112



Notes to Table 1–10:

(1) All I/O pins have an option to enable weak pull-up except configuration, test, and JTAG pin. Weak pull-down feature is only available for JTAG

TCK.

(2) Pin pull-up resistance values may be lower if an external source drives the pin higher than VCCIO.

(3) R_PU = (VCCIO –VI)/IR_PU

Minimum condition: –40°C; VCCIO = VCC + 5%, VI = VCC + 5% – 50 mV;

Typical condition: 25°C; VCCIO = VCC, VI = 0 V;

Maximum condition: 125°C; VCCIO = VCC – 5%, VI = 0 V; in which VI refers to the input voltage at the I/O pin.

(4) R_PD = VI/IR_PD

Minimum condition: –40°C; VCCIO = VCC + 5%, VI = 50 mV;

Typical condition: 25°C; VCCIO = VCC, VI = VCC –5%;

Maximum condition: 125°C; VCCIO = VCC – 5%, VI = VCC – 5%; in which VI refers to the input voltage at the I/O pin.

Table 1–11. Cyclone III Devices Hot-Socketing Specifications

Symbol

Parameter

Maximum

IIOPIN(DC)

DC current per I/O pin

300

A

IIOPIN(AC)

AC current per I/O pin

8 mA (1)

Note to Table 1–11:

(1) The I/O ramp rate is 10 ns or more. For ramp rates faster than 10 ns, |IIOPIN| = C

dv/dt, in which C is I/O pin capacitance and dv/dt is the slew rate.

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