EP3C5E144C8N Datasheet, PDF (323/348 Pages) Altera Corporation – Ability to disable external JTAG port

Chapter 2: Cyclone III LS Device Data Sheet
2–9
Electrical Characteristics
Internal Weak Pull-Up and Weak Pull-Down Resistor
Table 2–10 lists the weak pull-up and pull-down resistor values for Cyclone III LS
devices.
Table 2–10. Cyclone III LS Devices Internal Weak Pull-Up Weak and Pull-Down Resistor ⁽¹⁾
Symbol
Parameter
Conditions
Min Typ Max Unit
V_CCIO = 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
V_CCIO = 2.5 V ± 5% ^{(2), (3)}
V_CCIO = 1.8 V ± 5% ^{(2), (3)}
pull-up resistor option is enabled
V_CCIO = 1.5 V ± 5% ^{(2), (3)}
V_CCIO = 1.2 V ± 5% ^{(2), (3)}
V_CCIO = 3.3 V ± 5% ⁽⁴⁾
V_CCIO = 3.0 V ± 5% ⁽⁴⁾
R_{_PD}
Value of I/O pin pull-down resistor
before and during configuration
V_CCIO = 2.5 V ± 5% ⁽⁴⁾
V_CCIO = 1.8 V ± 5% ⁽⁴⁾
V_CCIO = 1.5 V ± 5% ⁽⁴⁾
7
25 41 kΩ
7
28 47 kΩ
8
35 61 kΩ
10 57 108 kΩ
13 82 163 kΩ
19 143 351 kΩ
6
19 30 kΩ
6
22 36 kΩ
6
25 43 kΩ
7
35 71 kΩ
8
50 112 kΩ
Notes to Table 2–10:
(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: 125°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: 125°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.
Hot Socketing
Table 2–11 lists the hot-socketing specifications for Cyclone III LS devices.
Table 2–11. Cyclone III Devices LS Hot-Socketing Specifications
Symbol
Parameter
Maximum
I_IOPIN(DC)
I_IOPIN(AC)
DC current per I/O pin
AC current per I/O pin
300 μA
8 mA ⁽¹⁾
Note to Table 2–11:
(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.
December 2011 Altera Corporation
Cyclone III Device Handbook
Volume 2