EP1M350 datasheet(60/86 Pages) ALTERA

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Altera Corporation

Mercury Programmable Logic Device Family Data Sheet

The Mercury 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 1.5-V, 1.8-V, 2.5-V or

3.3-V power supply, depending on the output requirements. When VCCIO

pins are connected to a 1.5-V power supply, the output levels are

compatible with HSTL systems. When 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 the VCCIO pins are

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

compatible with 3.3-V or 5.0-V systems.

Table 14 summarizes Mercury MultiVolt I/O support.

Notes to Table 14:

(1)

The PCI clamping diode must be disabled to drive an input with voltages higher than VCCIO unless an external

resistor is used.

(2)

These input levels are only available if the input standard is set to any VREF-based input standard (SSTL-2, SSTL-3,

HSTL, GTL+, AGP 2

×). The input buffers are powered from V

CCINT when using VREF-based input standards.

LVTTL, PCI, PCI-X, AGP 1

× input buffers are powered by V

CCIO. Therefore, these standards cannot be driven with

input levels below the VCCIO setting except for when VCCIO = 3.3 V and the input voltage (VI) = 2.5 V.

(3)

When VCCIO = 1.8 V, the Mercury device can drive a 1.5-V device with 1.8-V tolerant inputs.

(4)

When VCCIO = 2.5 V, the Mercury device can drive a 1.8-V device with 2.5-V tolerant inputs.

(5)

When VCCIO = 3.3 V, the Mercury device can drive a 2.5-V device with 3.3-V tolerant inputs.

(6)

Designers can set Mercury devices to be 5.0-V tolerant by adding an external resistor and enabling the PCI clamping

diode.

Power Sequencing & Hot-Socketing

Because Mercury devices can be used in a mixed-voltage environment,

the devices are designed specifically to tolerate any possible power-up

sequence. Therefore, the VCCIO and VCCINT power supplies may be

powered in any order.

Signals can be driven into Mercury devices before and during power-up

without damaging the device. In addition, Mercury devices do not drive

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

device is configured, Mercury devices operate as specified by the user.

Table 14. Mercury MultiVolt I/O Support

Note (1)

VCCIO

(V)

Input Signal

Output Signal

1.5 V

1.8 V

2.5 V

3.3 V

5.0 V

1.5 V

1.8 V

2.5 V

3.3 V

5.0 V

1.5

1.8

v (2)

v (3)

2.5

v (2)

v (4)

3.3

v (2)

vv (6)

v (5)

EP1M350 Datasheet(PDF) 60 Page - Altera Corporation

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