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EP3C120F484C7N Datasheet, PDF (9/34 Pages) Altera Corporation – 1. Cyclone III Device Datasheet | |||
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Chapter 1: Cyclone III Device Datasheet
1â9
Electrical Characteristics
Internal Weak Pull-Up and Weak Pull-Down Resistor
Table 1â10 lists the weak pull-up and pull-down resistor values for Cyclone III
devices.
Table 1â10. Cyclone III Devices Internal Weak Pull-Up and Weak Pull-Down Resistor (1)
Symbol
Parameter
Conditions
Min Typ Max Unit
VCCIO = 3.3 V ± 5% (2), (3)
Value of I/O pin pull-up resistor before VCCIO = 3.0 V ± 5% (2), (3)
R_PU
and during configuration, as well as
user mode if the programmable
VCCIO = 2.5 V ± 5% (2), (3)
VCCIO = 1.8 V ± 5% (2), (3)
pull-up resistor option is enabled
VCCIO = 1.5 V ± 5% (2), (3)
VCCIO = 1.2 V ± 5% (2), (3)
VCCIO = 3.3 V ± 5% (4)
VCCIO = 3.0 V ± 5% (4)
R_PD
Value of I/O pin pull-down resistor
before and during configuration
VCCIO = 2.5 V ± 5% (4)
VCCIO = 1.8 V ± 5% (4)
VCCIO = 1.5 V ± 5% (4)
7
25 41 kï
7
28 47 kï
8
35 61 kï
10 57 108 kï
13 82 163 kï
19 143 351 kï
6
19 30 kï
6
22 36 kï
6
25 43 kï
7
35 71 kï
8
50 112 kï
Notes to Table 1â10:
(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 â VI)/IR_PU
Minimum condition: â40°C; VCCIO = VCC + 5%, VI = VCC + 5% â 50 mV;
Typical condition: 25°C; VCCIO = VCC, VI = 0 V;
Maximum condition: 125°C; VCCIO = VCC â 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: â40°C; VCCIO = VCC + 5%, VI = 50 mV;
Typical condition: 25°C; VCCIO = VCC, VI = VCC â 5%;
Maximum condition: 125°C; VCCIO = VCC â 5%, VI = VCC â 5%; in which VI refers to the input voltage at the I/O pin.
Hot Socketing
Table 1â11 lists the hot-socketing specifications for Cyclone III devices.
Table 1â11. Cyclone III Devices Hot-Socketing Specifications
Symbol
Parameter
Maximum
IIOPIN(DC)
IIOPIN(AC)
DC current per I/O pin
AC current per I/O pin
300 ïA
8 mA (1)
Note to Table 1â11:
(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
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