AN1318 - APPLICATION NOTE

3/9

3.3 PECL.

The positive supply voltage of this family is a remedy to the disadvantages of the negative supply voltage

of ECL technology. The PECL technology works at 5V ±5%, while for low voltage applications the

LVPECL should be used, which has a 3.3V supply.

Figure 4: PECL Output Configuration

4. LVDS FAMILY SPECIFICATIONS.

Table 1: LVDS driver DC characteristics (Driver cells are terminated with 100Ohm built-in)

Table 2: LVDS receiver DC characteristics (Receiver cells must be adapted with an external

100Ohm)

Symbol

Parameter

Minimum

Maximum

|Vod|

Output diff voltage

250mV

450mV

|Vos|

Output offset

1125mV

1375mV

Change in l Vod l

between 0 and 1

50mV

Change in Vos

between 0 and 1

50mV

|Isa / Isb|

Output current drivers

shorted to GND

24mA

|Isab|

Output current drivers

shorted together

12mA

Ixa / Ixb

Power off output

leakage Vcc=0V

1

µA

Symbol

Parameter

Minimum

Maximum

Vi

Input voltage range

V iA or V iB

0V

2.4V

Vidth

Input differential threshold

-0.100V

0.100V

Vhyst

Input differential hysteresis

0.025V

Z = 50

Ω and R = 220 Ω R = 100 Ω

Z

Z

R2

LVPECL

PECL

VCC

VCC

R1

R1