EP3C40 datasheet(10/34 Pages) ALTERA

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Chapter 1: Cyclone III Device Data Sheet

Electrical Characteristics

Cyclone III Device Handbook, Volume 2

Altera Corporation

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.

Hot Socketing

Table 1–11 lists the hot-socketing specifications for Cyclone III devices.

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.

Table 1–10. Cyclone III Devices Internal Weak Pull-Up and Weak Pull-Down Resistor

(Note 1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

_P U

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

CC IO = 3.3 V ± 5% (2), (3)

2541k

CC IO = 3.0 V ± 5% (2), (3)

2847k

CC IO = 2.5 V ± 5% (2), (3)

3561k

CC IO = 1.8 V ± 5% (2), (3)

108

CC IO = 1.5 V ± 5% (2), (3)

163

CC IO = 1.2 V ± 5% (2), (3)

143

351

_P D

Value of I/O pin pull-down resistor

before and during configuration

CC IO = 3.3 V ± 5% (4)

1930k

CC IO = 3.0 V ± 5% (4)

2236k

CC IO = 2.5 V ± 5% (4)

2543k

CC IO = 1.8 V ± 5% (4)

3571k

CC IO = 1.5 V ± 5% (4)

850

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.

Table 1–11. Cyclone III Devices Hot-Socketing Specifications

Symbol

Parameter

Maximum

IOPIN(DC )

DC current per I/O pin

300

μA

IOPIN(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.

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