APEX20KC datasheet(45/90 Pages) ALTERA

45 / 90 page

Altera Corporation

APEX 20KC Programmable Logic Device Data Sheet

Signals can be driven into APEX 20KC devices before and during power-

up without damaging the device. In addition, APEX 20KC devices do not

drive out during power-up. Once operating conditions are reached and

the device is configured, APEX 20KC devices operate as specified by the

user.

MultiVolt I/O

Interface

The APEX architecture supports the MultiVolt I/O interface feature,

which allows APEX devices in all packages to interface with systems of

different supply voltages. The devices have one set of VCC pins for

internal operation and input buffers (VCCINT), and another set for I/O

output drivers (VCCIO).

APEX 20KC devices support the MultiVolt I/O interface feature. The

APEX 20KC VCCINT pins must always be connected to a 1.8-V power

supply. With a 1.8-V VCCINT level, input pins are 1.8-V, 2.5-V, and 3.3-V

tolerant. The VCCIO pins can be connected to either a 1.8-V, 2.5-V, or 3.3-V

power supply, depending on the I/O standard requirements. When the

VCCIO

pins are connected to a 1.8-V power supply, the output levels are

compatible with 1.8-V systems. When VCCIO pins are connected to a 2.5-V

power supply, the output levels are compatible with 2.5-V systems. When

VCCIO

pins are connected to a 3.3-V power supply, the output high is

3.3 V and compatible with 3.3-V or 5.0-V systems. An APEX 20KC device

is 5.0-V tolerant with the addition of a resistor and the PCI clamp diode

enabled.

f For more information on 5.0-V tolerance, refer to the “5.0-V Tolerance in

APEX 20KE Devices White Paper,” as the information found therein also

applies to APEX 20KC devices.

Table 10 summarizes APEX 20KC MultiVolt I/O support.

Notes to Table 10:

(1)

The PCI clamping diode must be disabled to drive an input with voltages higher than VCCIO, except for the 5.0-V

input case.

(2)

An APEX 20KC device can be made 5.0-V tolerant with the addition of an external resistor and the PCI clamp diode

enabled.

(3)

When VCCIO = 3.3 V, an APEX 20KC device can drive a 2.5-V device with 3.3-V tolerant inputs.

Table 10. APEX 20KC MultiVolt I/O Support

VCCIO (V)

Input Signals (V)

Output Signals (V)

1.8

2.5

3.3

5.0

1.8

2.5

3.3

5.0

1.8

vv (1)

v (1)

2.5

vv (1)

3.3

v (2)

v (3)

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