AX2000 datasheet(26/262 Pages) MICROSEMI

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Detailed Specifications

2- 12

R e v i sio n 1 8

Table 2-8 • I/O Standards Supported by the Axcelerator Family

I/O Standard

Input/Output Supply

Voltage (VCCI)

Input Reference

Voltage (VREF)

Board Termination

Voltage (VTT)

LVTTL

3.3

N/A

LVCMOS 2.5 V

2.5

N/A

LVCMOS 1.8 V

1.8

N/A

LVCMOS 1.5 V (JDEC8-11)

1.5

N/A

3.3V PCI/PCI-X

3.3

N/A

GTL+ 3.3 V

3.3

1.0

1.2

GTL+ 2.5 V*

2.5

1.0

1.2

HSTL Class 1

1.5

0.75

SSTL3 Class 1 and II

3.3

1.5

SSTL2 Class1 and II

2.5

1.25

LVDS

2.5

N/A

LVPECL

3.3

N/A

Note:

*2.5 V GTL+ is not supported across the full military temperature range.

Table 2-9 • Supply Voltages

VCCA

VCCI

Input Tolerance

Output Drive Level

1.5 V

3.3 V

1.5 V

1.8 V

3.3 V

1.8 V

1.5 V

2.5 V

3.3 V

2.5 V

1.5 V

3.3 V

Table 2-10 • I/O Features Comparison

I/O Assignment

Clamp

Diode

Hot

Insertion

5 V

Tolerance

Input

Buffer

Output

Buffer

LVTTL

Yes

Yes1

Enabled/Disabled

3.3 V PCI, 3.3 V PCI-X

Yes

Yes1, 2

Enabled/Disabled

LVCMOS 2.5 V

Yes

Enabled/Disabled

LVCMOS 1.8 V

Yes

Enabled/Disabled

LVCMOS 1.5 V (JESD8-11)

Yes

Enabled/Disabled

Voltage-Referenced Input Buffer

Yes

Enabled/Disabled

Differential, LVDS/LVPECL, Input

Yes

Enabled

Disabled3

Differential, LVDS/LVPECL, Output

Yes

Disabled

Enabled4

Notes:

1. Can be implemented with an IDT bus switch.

2. Can be implemented with an external resistor.

3. The OE input of the output buffer must be deasserted permanently (handled by software).

4. The OE input of the output buffer must be asserted permanently (handled by software).

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