Voltage levels for various bus standards

Single Ended Signals

Standard

VCC

VOH

VIH

Vt

VIL

VOL

5V CMOS

4.5-5.5

VCC-0.2

0.7 VCC

2.5

0.3 VCC

0.5

2.5V CMOS

2.3-2.7

VCC-0.2

0.7 VCC

1.25

0.2 VCC

0.2

3.3V CMOS

LVTTL

3.0-3.6

2.4

2.0

1.5

0.8

0.4

5V TTL

4.5-5.5

2.4

2.0

1.5

0.8

0.4

ETL

4.5-5.5

2.4

1.6

1.5

1.4

0.6

GTL

 

1.2

0.85

0.8

0.75

0.4

GTLP

 

1.5

1.05

1

0.95

0.55

TIA/EIA-232-F

RS-232

 

5

3

0

-3

-5

Differential Signals

Standard

VDD

VOH

VIH

Vdiff

VIL

VOL

SSTL_3 Class I

3.3

2.1

1.9

0.4

1.1

0.9

SSTL-3 Class II

3.3

2.3

1.9

0.4

1.1

0.7

SSTL_2 Class I

2.5

1.82

1.7

0.35

0.8

0.68

SSTL_2 Class II

2.5

2.01

1.7

0.35

0.8

0.49

USB

4.5-5.5

3.0-3.6

 

2.0

0.2

1.3

 

T1A/E1A -644

RS-644

LVDS

2.4

1.32

1.25

Vt=1.2

1.15

1.07

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s