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

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

725

41

k



728

47

k



835

61

k



10

57

108

k



13

82

163

k



19

143

351

k



Value of I/O pin pull-down resistor

before and during configuration

619

30

k



622

36

k



625

43

k



735

71

k



850

112

k



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.

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

Symbol

Parameter

Maximum

DC current per I/O pin

300

A

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.