
Chapter 1: Cyclone IV Device Datasheet
1–11
Operating Conditions
December 2013
Altera Corporation
Internal Weak Pull-Up and Weak Pull-Down Resistor
Table 1–12 lists the weak pull-up and pull-down resistor values for Cyclone IV
devices.
Hot-Socketing
Table 1–13 lists the hot-socketing specifications for Cyclone IV devices.
1 During hot-socketing, the I/O pin capacitance is less than 15 pF and the clock pin
capacitance is less than 20 pF.
Table 1–12. Internal Weak Pull
-Up and Weak Pull-Down Resistor Values for Cyclone IV Devi
ces (1)Symbol
Parameter
Conditions
Min
Typ
Max
Unit
R_PU
Value of the I/O pin pull-up resistor
before and during configuration, as
well as user mode if you enable the
programmable pull-up resistor option
725
41
k
728
47
k
835
61
k
10
57
108
k
13
82
163
k
19
143
351
k
R_PD
Value of the I/O pin pull-down resistor
before and during configuration
619
30
k
622
36
k
625
43
k
735
71
k
8
50
112
k
(1) All I/O pins have an option to enable weak pull
-up except the configuration, test, and JTAG pins. The 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: 100°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: 100°C; VCCIO = VCC – 5%, VI = VCC – 5%; in which VI refers to the input voltage at the I/O pin.
Table 1–13. Hot
-Socketing Specifications for Cyclone IV Devices
Symbol
Parameter
Maximum
IIOPIN(DC)
DC current per I/O pin
300
A
IIOPIN(AC)
AC current per I/O pin
IXCVRTX(DC)
DC current per transceiver TX pin
100 mA
IXCVRRX(DC)
DC current per transceiver RX pin
50 mA
(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 the I/O pin
capacitance and dv/dt is the slew rate.