SP207EHEA datasheet(7/16 Pages) SIPEX

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SP207EHDS/08

SP207EH Series High Performance Transceivers

Figure 4. Charge Pump — Phase 3

VCC = +5V

–5V

+5V

–5V

VSS Storage Capacitor

VDD Storage Capacitor

–

Receivers

The high performance receivers of the SP207EH

Series can accept input signals at a typical data

rate of 500Kbps. The receivers convert RS-232

input signals to inverted TTL signals. 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

virtually 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 SP211EH, and SP213EH all feature a

control input which will disable the device and

reduce the power supply current to less than

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:

SP211EH:

• +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

SP213EH:

• 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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