Spartan-3E FPGA Family: DC and Switching Characteristics
DS312 (v4.1) July 19, 2013
Product Specification
118
General DC Characteristics for I/O Pins
Table 78: General DC Characteristics of User I/O, Dual-Purpose, and Dedicated Pins
Symbol
Description
Test Conditions
Min
Typ
Max
Units
Leakage current at User I/O, Input-only,
Dual-Purpose, and Dedicated pins
Driver is in a high-impedance state, VIN =
0V or VCCO max, sample-tested
–10
–
+10
μA
IRPU(2) Current through pull-up resistor at User I/O, Dual-Purpose, Input-only, and Dedicated
pins
VIN = 0V, VCCO = 3.3V
–0.36
–
–1.24
mA
VIN = 0V, VCCO = 2.5V
–0.22
–
–0.80
mA
VIN = 0V, VCCO = 1.8V
–0.10
–
–0.42
mA
VIN = 0V, VCCO = 1.5V
–0.06
–
–0.27
mA
VIN = 0V, VCCO = 1.2V
–0.04
–
–0.22
mA
RPU(2) Equivalent pull-up resistor value at User I/O, Dual-Purpose, Input-only, and
Dedicated pins (based on IRPU per Note 2)
VIN = 0V, VCCO = 3.0V to 3.465V
2.4
–
10.8
k
Ω
VIN = 0V, VCCO = 2.3V to 2.7V
2.7
–
11.8
k
Ω
VIN = 0V, VCCO = 1.7V to 1.9V
4.3
–
20.2
k
Ω
VIN = 0V, VCCO =1.4V to 1.6V
5.0
–
25.9
k
Ω
VIN = 0V, VCCO = 1.14V to 1.26V
5.5
–
32.0
k
Ω
IRPD(2) Current through pull-down resistor at User I/O, Dual-Purpose, Input-only, and
Dedicated pins
VIN = VCCO
0.10
–
0.75
mA
RPD(2) Equivalent pull-down resistor value at User I/O, Dual-Purpose, Input-only, and
Dedicated pins (based on IRPD per Note 2)
VIN = VCCO = 3.0V to 3.465V
4.0
–
34.5
k
Ω
VIN = VCCO = 2.3V to 2.7V
3.0
–
27.0
k
Ω
VIN = VCCO = 1.7V to 1.9V
2.3
–
19.0
k
Ω
VIN = VCCO = 1.4V to 1.6V
1.8
–
16.0
k
Ω
VIN = VCCO = 1.14V to 1.26V
1.5
–
12.6
k
Ω
IREF
VREF current per pin
All VCCO levels
–10
–
+10
μA
CIN
Input capacitance
–
10
pF
RDT
Resistance of optional differential
termination circuit within a differential I/O
pair. Not available on Input-only pairs.
VOCM Min ≤ VICM ≤ VOCM Max
VOD Min ≤ VID ≤ VOD Max
VCCO = 2.5V
–120
–
Ω
Notes:
1.
The numbers in this table are based on the conditions set forth in
Table 77.2.
This parameter is based on characterization. The pull-up resistance RPU = VCCO / IRPU. The pull-down resistance RPD =VIN /IRPD.
3.
For single-ended signals that are placed on a differential-capable I/O, VIN of –0.2V to –0.5V is supported but can cause increased leakage
between the two pins. See Parasitic Leakage in
UG331, Spartan-3 Generation FPGA User Guide.