SP207H Datasheet, PDF (4/14 Pages) Sipex Corporation – +5V High-Speed RS-232 Transceivers

PINOUT
T3 OUT 1
T1OUT 2
T2OUT 3
R1IN 4
R1OUT 5
T2IN 6
T1IN 7
GND 8
VCC 9
C1+ 10
V+ 11
C1– 12
24 T4 OUT
23 R2IN
22 R2OUT
21 T5IN
20 T5OUT
19 T4IN
18 T3IN
17 R3OUT
16 R3IN
15 V–
14 C2^–
13 C2⁺
T3 OUT 1
T1OUT 2
T2OUT 3
R2IN 4
R2OUT 5
T2IN 6
T1IN 7
R1OUT 8
R1IN 9
GND 10
VCC 11
C1+ 12
V+ 13
C1– 14
28 T4 OUT
27 NC
26 T5IN
25 SHUTDOWN (SD)
24 EN
23 T5OUT
22 NC
21 T4IN
20 T3IN
19 R3OUT
18 R3IN
17 V–
16 C2^–
15 C2⁺
T3 OUT 1
T1OUT 2
T2OUT 3
R2IN 4
R2OUT 5
T2IN 6
T1IN 7
R1OUT 8
R1IN 9
GND 10
VCC 11
C1+ 12
V+ 13
C1– 14
28 T4 OUT
27 R3IN
26 R3OUT
25 SHUTDOWN (SD)
24 EN
23 R4IN
22 R4OUT
21 T4IN
20 T3IN
19 R5OUT
18 R5IN
17 V–
16 C2^–
15 C2⁺
T3 OUT 1
T1OUT 2
T2OUT 3
R2IN 4
R2OUT 5
T2IN 6
T1IN 7
R1OUT 8
R1IN 9
GND 10
VCC 11
C1+ 12
V+ 13
C1– 14
28 T4 OUT
27 R3IN
26 R3OUT
25 SHUTDOWN (SD)
24 EN
23 R4IN
22 R4OUT
21 T4IN
20 T3IN
19 R5OUT
18 R5IN
17 V–
16 C2^–
15 C2⁺
FEATURES…
The SP207H and SP211H line transceivers
provide a variety of configurations to fit most
communication needs, especially those applica-
tions where ±12V is not available. Both prod-
ucts feature low–power CMOS construction
and Sipex–proprietary on-board charge pump
circuitry to generate the ±10V RS-232 voltage
levels. The ability to use 0.1µF charge pump
capacitors saves board space and reduces circuit
cost.
The SP207HB and SP211H models feature a
low–power shutdown mode, which reduces
power supply drain to 1µA. The SP207HB and
SP211HB are equipped with the WakeUp func-
tion. The WakeUp function keeps the receivers
active in the shutdown mode, unless disabled by
the EN pin.
THEORY OF OPERATION
The SP207H and SP211H are made up of three
basic circuit blocks — 1) transmitter/driver, 2)
receiver and 3) the Sipex–proprietary charge
pump.
Charge–Pump
The charge pump is a Sipex–patented design
(5,306,954) and uses a unique approach com-
pared to older less–efficient designs. The charge
pump still requires four external capacitors, but
uses a four–phase voltage shifting technique to
attain symmetrical 10V power supplies. Figure
3a shows the waveform found on the positive
side of capcitor C₂, and Figure 3b shows the
TGoddard/SP207H/9614R0
SP207H/SP211H High–Speed Transceivers
4
© Copyright 2000 Sipex Corporation