
2-25
Architecture
Lattice Semiconductor
LatticeXP Family Data Sheet
Table 2-8. Supported Output Standards
Hot Socketing
The LatticeXP devices have been carefully designed to ensure predictable behavior during power-up and power-
down. Power supplies can be sequenced in any order. During power up and power-down sequences, the I/Os
remain in tristate until the power supply voltage is high enough to ensure reliable operation. In addition, leakage
into I/O pins is controlled to within specified limits, which allows easy integration with the rest of the system.
These capabilities make the LatticeXP ideal for many multiple power supply and hot-swap applications.
Sleep Mode
The LatticeXP “C” devices (VCC = 1.8/2.5/3.3V) have a sleep mode that allows standby current to be reduced by up
to three orders of magnitude during periods of system inactivity. Entry and exit to Sleep Mode is controlled by the
SLEEPN pin.
During Sleep Mode, the FPGA logic is non-operational, registers and EBR contents are not maintained and I/Os
are tri-stated. Do not enter Sleep Mode during device programming or configuration operation. In Sleep Mode,
power supplies can be maintained in their normal operating range, eliminating the need for external switching of
power supplies.
Table 2-9 compares the characteristics of Normal, Off and Sleep Modes.
Output Standard
Drive
VCCIO (Nom.)
Single-ended Interfaces
LVTTL
4mA, 8mA, 12mA, 16mA, 20mA
3.3
LVCMOS33
4mA, 8mA, 12mA 16mA, 20mA
3.3
LVCMOS25
4mA, 8mA, 12mA 16mA, 20mA
2.5
LVCMOS18
4mA, 8mA, 12mA 16mA
1.8
LVCMOS15
4mA, 8mA
1.5
LVCMOS12
2mA, 6mA
1.2
LVCMOS33, Open Drain
4mA, 8mA, 12mA 16mA, 20mA
—
LVCMOS25, Open Drain
4mA, 8mA, 12mA 16mA, 20mA
—
LVCMOS18, Open Drain
4mA, 8mA, 12mA 16mA
—
LVCMOS15, Open Drain
4mA, 8mA
—
LVCMOS12, Open Drain
2mA. 6mA
—
PCI33
N/A
3.3
HSTL18 Class I, II, III
N/A
1.8
HSTL15 Class I, III
N/A
1.5
SSTL3 Class I, II
N/A
3.3
SSTL2 Class I, II
N/A
2.5
SSTL18 Class I
N/A
1.8
Differential Interfaces
Differential SSTL3, Class I, II
N/A
3.3
Differential SSTL2, Class I, II
N/A
2.5
Differential SSTL18, Class I
N/A
1.8
Differential HSTL18, Class I, II, III
N/A
1.8
Differential HSTL15, Class I, III
N/A
1.5
LVDS
N/A
2.5
BLVDS
1
N/A
2.5
LVPECL
1
N/A
3.3
1. Emulated with external resistors.