Spartan-3 FPGA Family: DC and Switching Characteristics
DS099 (v3.1) June 27, 2013
Product Specification
63
Table 35: Recommended Operating Conditions for User I/Os Using Single-Ended Standards
Signal Standard
(IOSTANDARD)
VCCO
VREF
VIL
VIH
Min (V)
Nom (V)
Max (V)
Min (V)
Nom (V)
Max (V)
Min (V)
––
–
0.74
0.8
0.86
VREF – 0.05
VREF + 0.05
GTL_DCI
–
1.2
–
0.74
0.8
0.86
VREF – 0.05
VREF + 0.05
––
–
0.88
1
1.12
VREF – 0.1
VREF + 0.1
GTLP_DCI
–
1.5
–
0.88
1
1.12
VREF – 0.1
VREF + 0.1
HSLVDCI_15
1.4
1.5
1.6
–
0.75
–
VREF – 0.1
VREF + 0.1
HSLVDCI_18
1.7
1.8
1.9
–
0.9
–
VREF – 0.1
VREF + 0.1
HSLVDCI_25
2.3
2.5
2.7
–
1.25
–
VREF – 0.1
VREF + 0.1
HSLVDCI_33
3.0
3.3
3.465
–
1.65
–
VREF – 0.1
VREF + 0.1
HSTL_I, HSTL_I_DCI
1.4
1.5
1.6
0.68
0.75
0.9
VREF – 0.1
VREF + 0.1
HSTL_III,
HSTL_III_DCI
1.4
1.5
1.6
–
0.9
–
VREF – 0.1
VREF + 0.1
HSTL_I_18,
HSTL_I_DCI_18
1.7
1.8
1.9
0.8
0.9
1.1
VREF – 0.1
VREF + 0.1
HSTL_II_18,
HSTL_II_DCI_18
1.7
1.8
1.9
–
0.9
–
VREF – 0.1
VREF + 0.1
HSTL_III_18,
HSTL_III_DCI_18
1.7
1.8
1.9
–
1.1
–
VREF – 0.1
VREF + 0.1
LVCMOS12
1.14
1.2
1.3
–
–0.37VCCO
0.58VCCO
LVCMOS15,
LVDCI_15,
LVDCI_DV2_15
1.4
1.5
1.6
–
–0.30VCCO
0.70VCCO
LVCMOS18,
LVDCI_18,
LVDCI_DV2_18
1.7
1.8
1.9
–
–0.30VCCO
0.70VCCO
LVDCI_25,
2.3
2.5
2.7
–
–0.7
1.7
LVCMOS33,
LVDCI_33,
3.0
3.3
3.465
–
–0.8
2.0
LVTTL
3.0
3.3
3.465
–
–0.8
2.0
3.0
3.3
3.465
–
–0.30VCCO
0.50VCCO
SSTL18_I,
SSTL18_I_DCI
1.7
1.8
1.9
0.833
0.900
0.969
VREF – 0.125
VREF + 0.125
SSTL18_II
1.7
1.8
1.9
0.833
0.900
0.969
VREF – 0.125
VREF + 0.125
SSTL2_I,
SSTL2_I_DCI
2.3
2.5
2.7
1.15
1.25
1.35
VREF – 0.15
VREF + 0.15
SSTL2_II,
SSTL2_II_DCI
2.3
2.5
2.7
1.15
1.25
1.35
VREF – 0.15
VREF + 0.15
Notes:
1.
Descriptions of the symbols used in this table are as follows:
VCCO – the supply voltage for output drivers as well as LVCMOS, LVTTL, and PCI inputs
VREF – the reference voltage for setting the input switching threshold
VIL – the input voltage that indicates a Low logic level
VIH – the input voltage that indicates a High logic level
2.
For device operation, the maximum signal voltage (VIH max) may be as high as VIN max. See Table 28. 3.
Because the GTL and GTLP standards employ open-drain output buffers, VCCO lines do not supply current to the I/O circuit, rather this current is
provided using an external pull-up resistor connected from the I/O pin to a termination voltage (VTT). Nevertheless, the voltage applied to the
associated VCCO lines must always be at or above VTT and I/O pad voltages.
4.
There is approximately 100 mV of hysteresis on inputs using LVCMOS25 or LVCMOS33 standards.
5.
All dedicated pins (M0-M2, CCLK, PROG_B, DONE, HSWAP_EN, TCK, TDI, TDO, and TMS) use the LVCMOS standard and draw power from the
VCCAUX rail (2.5V). The dual-purpose configuration pins (DIN/D0, D1-D7, CS_B, RDWR_B, BUSY/DOUT, and INIT_B) use the LVCMOS standard
before the user mode. For these pins, apply 2.5V to the VCCO Bank 4 and VCCO Bank 5 rails at power-on and throughout configuration. For information
6.
The Global Clock Inputs (GCLK0-GCLK7) are dual-purpose pins to which any signal standard can be assigned.
7.