參數(shù)資料
型號(hào)： MAX3237E(MegaBaud)
廠商： Maxim Integrated Products, Inc.
元件分類： RS-232
英文描述： 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors
中文描述： 5V的高速RS - 232收發(fā)器與0.1uF電容
文件頁(yè)數(shù)： 11/20頁(yè)
文件大小： 299K
代理商： MAX3237E(MEGABAUD)
M
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
______________________________________________________________________________________
11
___________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 C
BYPASS
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 V
CC
bypass capacitor
is adequate. In applications that are sensitive to power-
supply noise, use a capacitor of the same value as
charge-pump capacitor C1. Connect bypass capaci-
tors as close to the IC as possible.
Operation Down to 2.7V
Transmitter outputs will meet EIA/TIA-562 levels of
±3.7V with supply voltages as low as 2.7V.
Transmitter Outputs when
Recovering from Shutdown
Figure 3 shows two transmitter outputs when recover-
ing from shutdown mode. As they become active, the
two transmitter outputs are shown going to opposite
RS-232 levels (one transmitter input is high, the other is
low). Each transmitter is loaded with 3k
in parallel with
2500pF. The transmitter outputs display no ringing or
undesirable transients as they come out of shutdown.
Note that the transmitters are enabled only when the
magnitude of V- exceeds approximately -3V.
Mouse Driveability
The MAX3241E has been specifically designed to
power serial mice while operating from low-voltage
power supplies. It has been tested with leading mouse
brands from manufacturers such as Microsoft and
Logitech. The MAX3241E successfully drove all serial
mice tested and met their respective current and volt-
age requirements. Figure 6a shows the transmitter out-
put voltages under increasing load current at 3.0V.
Figure 6b shows a typical mouse connection using the
MAX3241E.
High Data Rates
The MAX3222E/MAX3232E/MAX3237E/MAX3241E
maintain the RS-232 ±5.0V minimum transmitter output
voltage even at high data rates. Figure 7 shows a trans-
mitter loopback test circuit. Figure 8 shows a loopback
test result at 120kbps, and Figure 9 shows the same test
at 250kbps. For Figure 8, all transmitters were driven
simultaneously at 120kbps into RS-232 loads in parallel
with 1000pF. For Figure 9, a single transmitter was driv-
en at 250kbps, and all transmitters were loaded with an
RS-232 receiver in parallel with 1000pF.
Table 2. Required Minimum Capacitor
Values
0.047
0.1
C1
(μF)
0.33
0.47
C2, C3, C4
(μF)
MAX3222E/MAX3232E/MAX3241E
3.0 to 3.6
4.5 to 5.5
3.0 to 5.5
MAX3237E
V
CC
(V)
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
0
1
LOAD CURRENT PER TRANSMITTER (mA)
2
3
4
5
6
7
8
9
10
M
T
V
OUT+
V
OUT-
V
OUT+
V
OUT-
V
CC
V
CC
= 3.0V
Figure 6a. MAX3241E Transmitter Output Voltage vs. Load
Current per Transmitter
0.1
0.1
0.22
0.1
0.047
0.22
0.22
0.1
0.33
1.0
3.0 to 3.6
3.15 to 3.6
4.5 to 5.5
3.0 to 5.5
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MAX3238CAI-T 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
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