EP3C5_1 Datasheet, PDF (10/34 Pages) Altera Corporation – Cyclone III Device Data Sheet

1–10
Chapter 1: Cyclone III Device Data Sheet
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.
Table 1–10. Cyclone III Devices Internal Weak Pull-Up and Weak Pull-Down Resistor (Note 1)
Symbol
Parameter
Conditions
Min Typ Max Unit
V_CCIO = 3.3 V ± 5% (2), (3)
7
25 41 kΩ
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)
7
28 47 kΩ
8
35 61 kΩ
10 57 108 kΩ
13 82 163 kΩ
VCCIO = 1.2 V ± 5% (2), (3)
19 143 351 kΩ
V_CCIO = 3.3 V ± 5% (4)
6
19 30 kΩ
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)
6
22 36 kΩ
6
25 43 kΩ
7
35 71 kΩ
VCCIO = 1.5 V ± 5% (4)
8
50 112 kΩ
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
Parameter
Maximum
I_{I O PI N (D C )}
DC current per I/O pin
300 μA
II O PI N (A C)
AC current per I/O pin
8 mA (1)
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.
Schmitt Trigger Input
Cyclone III devices support Schmitt trigger input on TDI, TMS, TCK, nSTATUS,
nCONFIG, nCE, CONF_DONE, and DCLK pins. A Schmitt trigger feature introduces
hysteresis to the input signal for improved noise immunity, especially for signal with
slow edge rate. Table 1–12 lists the hysteresis specifications across supported V_CCIO
range for Schmitt trigger inputs in Cyclone III devices.
Cyclone III Device Handbook, Volume 2
© January 2010 Altera Corporation