ep1m120 Altera Corporation, ep1m120 Datasheet - Page 60

• Manufacturer Part Number: ep1m120
• Description: Programmable Logic Device Family
• Manufacturer: Altera Corporation

Mercury Programmable Logic Device Family Data Sheet
Notes to
(1)
(2)
(3)
(4)
(5)
(6)
60
Table 14. Mercury MultiVolt I/O Support
V
(V)
1.5
1.8
2.5
3.3
CCIO
The PCI clamping diode must be disabled to drive an input with voltages higher than V
resistor is used.
These input levels are only available if the input standard is set to any V
HSTL, GTL+, AGP 2 ). The input buffers are powered from V
LVTTL, PCI, PCI-X, AGP 1 input buffers are powered by V
input levels below the V
When V
When V
When V
Designers can set Mercury devices to be 5.0-V tolerant by adding an external resistor and enabling the PCI clamping
diode.
Table
v
v
v
1.5 V
CCIO
CCIO
CCIO
v
14:
(2)
(2)
(2)
= 1.8 V, the Mercury device can drive a 1.5-V device with 1.8-V tolerant inputs.
= 2.5 V, the Mercury device can drive a 1.8-V device with 2.5-V tolerant inputs.
= 3.3 V, the Mercury device can drive a 2.5-V device with 3.3-V tolerant inputs.
v
v
1.8 V
v
v
(2)
(2)
CCIO
Input Signal
The Mercury VCCINT pins must always be connected to a 1.8-V power
supply. With a 1.8-V 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
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.
v
setting except for when V
2.5 V
v
v
v
(2)
summarizes Mercury MultiVolt I/O support.
3.3 V
v
v
v
v
Note (1)
v
5.0 V
CCINT
(6)
CCIO
CCIO
= 3.3 V and the input voltage (V
level, input pins are 1.8-V, 2.5-V and 3.3-V
CCINT
1.5 V
v
. Therefore, these standards cannot be driven with
when using V
REF
v
v
1.8 V
-based input standard (SSTL-2, SSTL-3,
(3)
(4)
Output Signal
REF
v
2.5 V
-based input standards.
v
(5)
CCIO
I
) = 2.5 V.
Altera Corporation
unless an external
3.3 V
v
5.0 V
v