MAX212 Ver la hoja de datos (PDF) - Maxim Integrated
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MAX212 Datasheet PDF : 8 Pages
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+3V-Powered, Low-Power,
True RS-232 Transceiver
C1
0.68µF
+3.3V
C3
0.33µF
SHUTDOWN
ENABLE
D1
1N6050
L
15µH
D2
1N6050
23 1
2 14
V+ LN
LP V-
3 VCC
+3.3V TO ±6.5V
DC-DC CONVERTER
4 SD
MAX212
11 T1IN
T1
T1OUT 17
12 T2IN
13 T3IN
6 R1OUT
T2OUT 16
T2
T3OUT 15
T3
R1
R1IN 22
7 R2OUT
R2
R2IN 21
8 R3OUT
R3IN 20
R3
9 R4OUT
10 R5OUT
R4IN 19
R4
R5IN 18
R5
C2
0.33µF
EN GND
5 24
Figure 1. Typical Application Circuit
Switch-Mode Power Supply
The switch-mode power supply uses a single inductor
with two inexpensive diodes and two capacitors to
generate ±6.5V from the 3.0V to 3.6V input. Figure 1
shows the complete circuit for the power supply.
Use a 15µH inductor with a saturation current rating of at
least 350mA and under 1Ω resistance. Sample surface-
mount inductors are available from Maxim. Use 1N6050
diodes or equivalent. Surface-mount equivalents for the
1N6050 include the Motorola MMBD6050LT1, Philips
PMBD6050, and Allegro (formerly Sprague) TMPD6050LT.
For C1 and C2, use ceramic capacitors with values no
less than indicated in Figure 1. These capacitors deter-
mine the ripple on V+ and V-, but not the absolute volt-
ages. Bypass VCC to GND with at least 0.33µF close to
the MAX212. Increase this to 4.7µF if there are no other
VCC supply bypass components less than 6 inches
(15cm) away from the MAX212.
Component suppliers are listed in Table 1.
RS-232 Drivers
All three drivers are identical and deliver EIA/TIA-232E
and EIA/TIA-562 output voltage levels when VCC is
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RS-232 Receivers
All five receivers are identical and accept
EIA/TIA-232E and EIA/TIA-562 input signals. The CMOS
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When EN is low, the receivers’ outputs are put into a
high-impedance state. This allows two RS-232 ports (or
two parts of different types) to be wire-ORed at the UART.
Table 1. Suggested Component Suppliers
MANUFACTURER
PART NUMBER
Allegro
TMPD6050LT
Motorola
MMBD6050LT1
Murata
LQH4N150K-TA
Philips
PMBD6050
Sumida
CD43150
TDK
NLC453232T-150K
PHONE NUMBER
USA (508) 853-5000
USA (408) 749-0510
USA (404) 831-9172
Japan (075) 951-9111
USA (401) 762-3800
USA (708) 956-0666
Japan (03) 3607-5111
USA (708) 803-6100
Japan (03) 3278-5111
FAX NUMBER
USA (508) 853-5049
USA (408) 991-7420
USA (404) 436-3030
Japan (075) 955-6526
USA (401) 767-4493
USA (708) 956-0702
Japan (03) 3607-5428
USA (708) 803-6296
Japan (03) 3278-5358
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