Altera Cyclone IV - Internal Weak Pull-Up and Weak Pull-Down Resistor; Hot-Socketing

Chapter 1: Cyclone IV Device Datasheet 1–11
Operating Conditions
December 2016 Altera Corporation Cyclone IV Device Handbook,
Volume 3
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 Devices
(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
V
CCIO
= 3.3 V ± 5%
(2), (3)
72541k
V
CCIO
= 3.0 V ± 5%
(2), (3)
72847k
V
CCIO
= 2.5 V ± 5%
(2), (3)
83561k
V
CCIO
= 1.8 V ± 5%
(2), (3)
10 57 108 k
V
CCIO
= 1.5 V ± 5%
(2), (3)
13 82 163 k
V
CCIO
= 1.2 V ± 5%
(2), (3)
19 143 351 k
R
_PD
Value of the I/O pin pull-down resistor
before and during configuration
V
CCIO
= 3.3 V ± 5%
(4)
61930k
V
CCIO
= 3.0 V ± 5%
(4)
62236k
V
CCIO
= 2.5 V ± 5%
(4)
62543k
V
CCIO
= 1.8 V ± 5%
(4)
73571k
V
CCIO
= 1.5 V ± 5%
(4)
8 50 112 k
Notes to Table 1–12:
(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 V
CCIO
.
(3) R
_PU
= (V
CCIO
–V
I
)/I
R_PU
Minimum condition: –40°C; V
CCIO
= V
CC
+ 5%, V
I
= V
CC
+ 5% – 50 mV;
Typical condition: 25°C; V
CCIO
= V
CC
, V
I
= 0 V;
Maximum condition: 100°C; V
CCIO
= V
CC
– 5%, V
I
= 0 V; in which V
I
refers to the input voltage at the I/O pin.
(4) R
_PD
= V
I
/I
R_PD
Minimum condition: –40°C; V
CCIO
= V
CC
+ 5%, V
I
= 50 mV;
Typical condition: 25°C; V
CCIO
= V
CC
, V
I
= V
CC
–5%;
Maximum condition: 100°C; V
CCIO
= V
CC
– 5%, V
I
= V
CC
– 5%; in which V
I
refers to the input voltage at the I/O pin.
Table 1–13. Hot-Socketing Specifications for Cyclone IV Devices
Symbol Parameter Maximum
I
IOPIN(DC)
DC current per I/O pin 300 A
I
IOPIN(AC)
AC current per I/O pin 8 mA
(1)
I
XCVRTX(DC)
DC current per transceiver TX pin 100 mA
I
XCVRRX(DC)
DC current per transceiver RX pin 50 mA
Note to Table 1–13:
(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.