ACEX1 datasheet(41/86 Pages) ETC

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Altera Corporation

ACEX 1K Programmable Logic Device Family Data Sheet

The VCCINT pins must always be connected to a 2.5-V power supply. With

a 2.5-V VCCINT level, input voltages are compatible with 2.5-V, 3.3-V, and

5.0-V inputs. The VCCIO pins can be connected to either a 2.5-V or 3.3-V

power supply, depending on the output requirements. When the VCCIO

pins are connected to a 2.5-V power supply, the output levels are

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

3.3-V power supply, the output high is at 3.3 V and is therefore compatible

with 3.3-V or 5.0-V systems. Devices operating with VCCIO levels higher

than 3.0 V achieve a faster timing delay of tOD2 instead of tOD1.

Table 13 summarizes ACEX 1K MultiVolt I/O support.

Notes:

(1)

The PCI clamping diode must be disabled on an input which is driven with a

voltage higher than VCCIO.

(2)

When VCCIO = 3.3 V, an ACEX 1K device can drive a 2.5-V device that has 3.3-V

tolerant inputs.

Open-drain output pins on ACEX 1K devices (with a pull-up resistor to

the 5.0-V supply) can drive 5.0-V CMOS input pins that require a higher

VIH than LVTTL. When the open-drain pin is active, it will drive low.

When the pin is inactive, the resistor will pull up the trace to 5.0 V, thereby

meeting the CMOS VOH requirement. The open-drain pin will only drive

low or tri-state; it will never drive high. The rise time is dependent on the

value of the pull-up resistor and load impedance. The IOL current

specification should be considered when selecting a pull-up resistor.

Power

Sequencing &

Hot-Socketing

Because ACEX 1K devices can be used in a mixed-voltage environment,

they have been designed specifically to tolerate any possible power-up

sequence. The VCCIO and VCCINT power planes can be powered in any

order.

Signals can be driven into ACEX 1K devices before and during power up

without damaging the device. Additionally, ACEX 1K devices do not

drive out during power up. Once operating conditions are reached,

ACEX 1K devices operate as specified by the user.

Table 13. ACEX 1K MultiVolt I/O Support

VCCIO (V)

Input Signal (V)

Output Signal (V)

2.5

3.3

5.0

2.5

3.3

5.0

2.5

v (1) v (1)

3.3

v (1)

v (2)

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