FG484 datasheet(52/162 Pages) MICROSEMI

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ProASIC3E DC and Switching Characteristics

2-38

Revision 13

Voltage-Referenced I/O Characteristics

3.3 V GTL

Gunning Transceiver Logic is a high-speed bus standard (JESD8-3). It provides a differential amplifier

input buffer and an open-drain output buffer. The VCCI pin should be connected to 3.3 V.

Timing Characteristics

Table 2-48 • Minimum and Maximum DC Input and Output Levels

3.3 V GTL

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

20 mA3

–0.3

VREF – 0.05 VREF + 0.05

3.6

0.4

–

20 20

181

268

10 10

Notes:

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

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

3. Output drive strength is below JEDEC specification.

Figure 2-12 • AC Loading

Table 2-49 • AC Waveforms, Measuring Points, and Capacitive Loads

Input Low (V)

Input High (V)

Measuring

Point* (V)

VREF (typ.) (V)

VTT (typ.) (V)

CLOAD (pF)

VREF – 0.05

VREF + 0.05

0.8

1.2

Note: *Measuring point = Vtrip. See Table 2-15 on page 2-18 for a complete table of trip points.

Test Point

10 pF

GTL

VTT

Table 2-50 • 3.3 V GTL

Commercial-Case Conditions: TJ = 70°C, Worst-Case VCC = 1.425 V,

Worst-Case VCCI = 3.0 V VREF = 0.8 V

Speed

Grade

tDOUT

tDP

tDIN

tPY

tEOUT

tZL

tZH

tLZ

tHZ

tZLS

tZHS

Units

Std.

0.60

2.08

0.04

2.93

0.43

2.04

2.08

4.27

4.31

–1

0.51

1.77

0.04

2.50

0.36

1.73

1.77

3.63

3.67

–2

0.45

1.55

0.03

2.19

0.32

1.52

1.55

3.19

3.22

Note: For specific junction temperature and voltage supply levels, refer to Table 2-6 on page 2-5 for derating values.

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