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MAX3222EC/D View Datasheet(PDF) - Maxim Integrated

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MAX3222EC/D Datasheet PDF : 26 Pages
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±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
VCC = +3.0V TO +5.5V
28 C1+
C1 24 C1-
1 C2+
C2
2 C2-
14 T1IN
CBYPASS
26
VCC
V+ 27
C3
MAX3241E
3
V-
C4
T1OUT 9
13 T2IN
T2OUT 10
VCC 12 T3IN
21 R1OUTB
T3OUT 11
20 R2OUTB
19 R1OUT
18 R2OUT
17 R3OUT
16 R4OUT
15 R5OUT
23 EN
R1IN 4
5kR2IN 5
5kR3IN 6
5kR4IN 7
5kR5IN 8
5k
GND
SHDN 22 VCC
25
COMPUTER SERIAL PORT
+V
+V
-V
GND
Tx
MOUSE
Figure 6b. Mouse Driver Test Circuit
Applications Information
Capacitor Selection
The capacitor type used for C1–C4 is not critical for
proper operation; polarized or nonpolarized capacitors
can be used. The charge pump requires 0.1µF capaci-
tors for 3.3V operation. For other supply voltages, see
Table 2 for required capacitor values. Do not use val-
ues smaller than those listed in Table 2. Increasing the
capacitor values (e.g., by a factor of 2) reduces ripple
on the transmitter outputs and slightly reduces power
consumption. C2, C3, and C4 can be increased without
changing C1’s value. However, do not increase C1
without also increasing the values of C2, C3, C4,
and CBYPASS to maintain the proper ratios (C1 to
the other capacitors).
When using the minimum required capacitor values,
make sure the capacitor value does not degrade
excessively with temperature. If in doubt, use capaci-
tors with a larger nominal value. The capacitor’s equiv-
alent series resistance (ESR), which usually rises at low
temperatures, influences the amount of ripple on V+
and V-.
Power-Supply Decoupling
In most circumstances, a 0.1µF VCC bypass capacitor
is adequate. In applications sensitive to power-supply
noise, use a capacitor of the same value as charge-
pump capacitor C1. Connect bypass capacitors as
close to the IC as possible.
Operation Down to 2.7V
Transmitter outputs meet EIA/TIA-562 levels of ±3.7V
with supply voltages as low as 2.7V.
______________________________________________________________________________________ 13
 

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