__________Applications Information

Charge-Pump Capacitor Selection

Normally, 0.1µF capacitors can be used for all loca-

tions. To reduce output ripple, increase the values of

the V+ and V- capacitors. If your capacitors have a

very wide tolerance, consider using a nominal value a

little larger than 0.1µF to ensure that the actual capaci-

tance does not fall below about 80nF. For circuits

designed to operate over a wide range of tempera-

tures, consider using slightly larger capacitors to com-

pensate for any loss of capacitance at temperature

extremes. No advantage is gained by using values

larger than 10µF.

Power-Supply Decoupling

Use a capacitor with the same value as the charge-

pump capacitors.

6

_______________________________________________________________________________________

+3.3V-Powered, EIA/TIA-562 Dual Transceiver

with Receivers Active in Shutdown

EN

INPUT

RECEIVER

OUTPUT

RECEIVER

OUTPUTS

+0.4V

0V

EN

INPUT

0V

+3V

0V

V+

V-

+3.7V

-3.7V

0V

1 OR 0

3k

50pF

A. TIMING DIAGRAM

B. TEST CIRCUIT

SHDN

Figure 4. Receiver Output Enable and Disable Timing

Figure 5. Transmitter Output Disable Timing