SP207ECT datasheet(7/16 Pages) SIPEX

7 / 16 page

SP207EDS/09

SP207E Series High Performance Transceivers

Figure 4. Charge Pump — Phase 3

VCC = +5V

–5V

+5V

–5V

VSS Storage Capacitor

VDD Storage Capacitor

–

Receivers

The receivers convert RS-232 input signals to

inverted TTL signals. Since the input is usually

from a transmission line where long cable lengths

and system interference can degrade the signal,

the inputs have a typical hysteresis margin of

500mV. This ensures that the receiver is virtu-

ally immune to noisy transmission lines. Should

an input be left unconnected, a 5k

Ω pulldown

resistor to ground will commit the output of the

receiver to a high state.

SHUTDOWN MODE

The SP211E, and SP213E all feature a control

input which will disable the device and reduce

the power supply current to less than 10

µA,

making the parts ideal for battery–powered

systems. In the “shutdown” mode the receivers

and transmitters will both be tri–stated. The V+

output of the charge pump will discharge to V

CC,

and the V– output will discharge to ground.

Products with the Wake-Up function can enable

or disable the receivers during shutdown.

Figure 5. Charge Pump — Phase 4

VCC = +5V

+10V

VSS Storage Capacitor

VDD Storage Capacitor

–

For complete shutdown to occur and the 10

µA

power drain to be realized, the following

conditions must be met:

SP211E:

• +5V must be applied to the SD pin

• ENABLE must be either 0V, +5.0V or not

connected

• the transmitter inputs must be either +5.0V

or not connected

• V

CC must be +5V

• Receiver inputs must be >0V and <+5V

SP213E:

• 0V must be applied to the SD pin

• ENABLE must be either 0V, +5.0V or not

connected

• the transmitter inputs must be either +5.0V

or not connected

• V

CC must be +5V

• Receiver inputs must be >0V and <+5V

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