SP211 datasheet(7/16 Pages) SIPEX

Part #	SP211

Description	5V High-Speed RS-232 Transceivers with 0.1mF Capacitors

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Manufacturer	SIPEX [Sipex Corporation]

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Date:05/26/2005

+5V High-Speed RS232 Transceivers

Figure 3. Charge Pump Waveforms

+10V

a) C

2

+

GND

b) C

2

–

–10V

pump. Each model within the Series incorpo-

rates variations of these circuits to achieve the

desired configuration and performance.

Transmitter/Driver

The drivers are inverting transmitters, which ac-

cept either TTL or CMOS inputs and output the

RS-232 signals with an inverted sense relative to

the input logic levels. Typically, the RS-232 out-

put voltage swing is

±9V with no load, and ±5V

minimum with full load. The transmitter outputs

are protected against infinite short–circuits to

ground without degradation in reliability. The

drivers of the SP200, SP206, SP206B, SP207B,

SP211, SP211B and SP213 can be tri–stated by

using

the

SHUTDOWN

function.

In the “power off” state, the output impedance will

remain greater than 300 Ohms, again satisfying the

RS-232 specifications. Should the input of the

driver be left open, an internal 400kOhm pullup

resistor to V

CC forces the input high, thus commit-

ting the output to a low state. The slew rate of the

transmitter output is internally limited to a maxi-

mum of 30V/

µs in order to meet the EIA standards

(EIA RS-232D 2.1.7, Paragraph 5). The transition

of the loaded output from high to low also meets

the monotonicity requirements of the standard.

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 5kOhm pulldown

resistor to ground will commit the output of the

receiver to a high state.

Figure 4. Charge Pump — Phase 3

VCC = +5V

–5V

+5V

–5V

VSS Storage Capacitor

VDD Storage Capacitor

C1

C2

C3

C4

+

++

–

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