IO20PDB0V0 datasheet(42/197 Pages) MICROSEMI

42 / 197 page

SmartFusion DC and Switching Characteristics

2- 30

R e v i sio n 1 2

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 2-35 • Minimum and Maximum DC Input and Output Levels

Applicable to FPGA I/O Banks

3.3 V LVTTL /

3.3 V LVCMOS

VIL

VIH

VOL

VOH

IOL IOH

IOSL

IOSH

IIL

IIH

Drive Strength

Min.

Max.

Min.

Max.

Min.

VmA mA

Max.

mA1

Max.

mA1

µA2 µA2

2 mA

–0.3

0.8

3.6

0.4

2.4

15 15

4 mA

–0.3

0.8

3.6

0.4

2.4

15 15

6 mA

–0.3

0.8

3.6

0.4

2.4

15 15

8 mA

–0.3

0.8

3.6

0.4

2.4

15 15

12 mA

–0.3

0.8

3.6

0.4

2.4

12 12

109

103

15 15

16 mA

–0.3

0.8

3.6

0.4

2.4

16 16

127

132

15 15

24 mA

–0.3

0.8

3.6

0.4

2.4

24 24

181

268

10 10

Notes:

1. Currents are measured at 100°C junction temperature and maximum voltage.

2. Currents are measured at 85°C junction temperature.

3. Software default selection highlighted in gray.

Table 2-36 • Minimum and Maximum DC Input and Output Levels

Applicable to MSS I/O Banks

3.3 V LVTTL /

3.3 V LVCMOS

VIL

VIH

VOL

VOH

IOL IOH

IOSL

IOSH

IIL

IIH

Drive Strength

Min.

Max.

Min.

Max.

Min.

VmA mA

Max.

mA1

Max.

mA1

µA2 µA2

8 mA

–0.3

0.8

3.6

0.4

2.4

15 15

Notes:

1. Currents are measured at 100°C junction temperature and maximum voltage.

2. Currents are measured at 85°C junction temperature.

3. Software default selection highlighted in gray.

Figure 2-6 •

AC Loading

Table 2-37 • AC Waveforms, Measuring Points, and Capacitive Loads

Input Low (V)

Input High (V)

Measuring Point* (V)

VREF (typ.) (V)

CLOAD (pF)

3.3

1.4

–

Note:

*Measuring point = Vtrip. See Table 2-22 on page 2-24 for a complete table of trip points.

Test Point

Enable Path

Datapath

35 pF

R = 1 K

R to GND for t

HZ / tZH / tZHS

R to VCCxxxxIOBx for t

LZ / tZL / tZLS

35 pF for t

ZH / tZHS / tZL / tZLS

35 pF for t

HZ / tLZ

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