Chapter 1: Cyclone III Device Datasheet
1–9
Electrical Characteristics
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.
(1)
Table 1–10. Cyclone III Devices Internal Weak Pull-Up and Weak Pull-Down Resistor
Symbol
Parameter
Conditions
Min
7
Typ
25
28
35
57
82
143
19
22
25
35
50
Max
41
Unit
(2), (3)
VCCIO = 3.3 V 5%
k
k
k
k
k
k
k
k
k
k
k
(2), (3)
(2), (3)
(2), (3)
(2), (3)
(2), (3)
(4)
V
V
CCIO = 3.0 V 5%
CCIO = 2.5 V 5%
7
47
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
8
61
R_PU
VCCIO = 1.8 V 5%
10
13
19
6
108
163
351
30
V
V
V
V
V
V
V
CCIO = 1.5 V 5%
CCIO = 1.2 V 5%
CCIO = 3.3 V 5%
CCIO = 3.0 V 5%
CCIO = 2.5 V 5%
CCIO = 1.8 V 5%
CCIO = 1.5 V 5%
(4)
6
36
Value of I/O pin pull-down resistor
before and during configuration
(4)
R_PD
6
43
(4)
7
71
(4)
8
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.
Hot Socketing
Table 1–11 lists the hot-socketing specifications for Cyclone III devices.
Table 1–11. Cyclone III Devices Hot-Socketing Specifications
Symbol
IIOPIN(DC)
Parameter
Maximum
DC current per I/O pin
AC current per I/O pin
300 A
(1)
IIOPIN(AC)
8 mA
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.
July 2012 Altera Corporation
Cyclone III Device Handbook
Volume 2
INTEL [ INTEL ]
