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IGLOO nano DC and Switching Characteristics
Ad vance v0.2
2-25
Single-Ended I/O Characteristics
3.3 V LVTTL / 3.3 V LVCMOS
Low-Voltage Transistor–Transistor Logic (LVTTL) is a general-purpose standard (EIA/JESD) for 3.3 V
applications. It uses an LVTTL input buffer and push-pull output buffer.
Table 2-33 Minimum and Maximum DC Input and Output Levels
3.3 V LVTTL /
3.3 V LVCMOS
VIL
VIH
VOL
VOH
IOL IOH
IOSL
IOSH
IIL
1 I
IH
2
Drive
Strength
Min., V Max., V Min., V Max., V Max., V Min., V mA mA Max., mA3 Max., mA3 A4 A4
2 mA
–0.3
0.8
2
3.6
0.4
2.4
2
25
27
10
4 mA
–0.3
0.8
2
3.6
0.4
2.4
4
25
27
10
6 mA
–0.3
0.8
2
3.6
0.4
2.4
6
51
54
10
8 mA
–0.3
0.8
2
3.6
0.4
2.4
8
51
54
10
Notes:
1. IIL is the input leakage current per I/O pin over recommended operating conditions where –0.3 < VIN < VIL.
2. IIH is the input leakage current per I/O pin over recommended operating conditions where VIH < VIN < VCCI.
Input current is larger when operating outside recommended ranges.
3. Currents are measured at high temperature (100°C junction temperature) and maximum voltage.
4. Currents are measured at 85°C junction temperature.
5. Software default selection highlighted in gray.
Figure 2-7 AC Loading
Table 2-34 3.3 V LVTTL/LVCMOS AC Waveforms, Measuring Points, and Capacitive Loads
Input LOW (V)
Input HIGH (V)
Measuring Point* (V)
CLOAD (pF)
03.3
1.4
5
Test Point
Enable Path
Datapath
5 pF
R = 1 k
R to VCCI for tLZ/tZL/tZLS
R to GND for tHZ/tZH/tZHS
35 pF for tZH/tZHS/tZL/tZLS
5 pF for tHZ/tLZ