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參數(shù)資料
| 型號： | MAX221EEUE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | 16-Bit Buffers/Drivers With 3-State Outputs 48-TVSOP -40 to 85 |
| 中文描述： | LINE TRANSCEIVER, PDSO16 |
| 封裝： | 4.40 MM, 0.65 MM PITCH, TSSOP-16 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 177K |
| 代理商： | MAX221EEUE |
M
±15kV ESD-Protected, +5V, 1μA, Single RS-232
Transceiver with AutoShutdown
_______________________________________________________________________________________
9
__________Applications Information
Using
INVALID
INVALID
indicates when an RS-232 signal is present at
the receiver input, and therefore when the port is in use.
INVALID
can be used in alternative shutdown control
schemes where it relieves the processor from constantly
polling the part for activity.
Capacitor Selection
The capacitor type used for C1–C4 is not critical for
proper operation; either polarized or nonpolarized
capacitors are acceptable. If polarized capacitors are
used, connect polarity as shown in the Typical
Operating Circuit. The charge pump requires 0.1μF
capacitors. Increasing the capacitor values (e.g., by a
factor of 2) reduces ripple on the transmitter output,
and slightly reduces power consumption. C2, C3, and
C4 can be increased without changing C1’s value.
However, do not increase C1’s value without also
increasing the values of C2, C3, and C4 to maintain the
proper ratios (C1 to the other capacitors).
When using the minimum 0.1μF capacitors, make sure
the capacitance does not degrade excessively with
temperature. If in doubt, use capacitors with a larger
nominal value. The capacitor’s equivalent series resis-
tance (ESR) usually rises at low temperatures and influ-
ences 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 the
charge-pump capacitor C1. Connect bypass capaci-
tors as close to the IC as possible.
Transmitter Output when
Exiting Shutdown
Figure 7 shows the transmitter output when exiting
shutdown mode. The transmitter is loaded with 3k
in
parallel with 1000pF. The transmitter output displays no
ringing or undesirable transients as the MAX221E
comes out of shutdown.
High Data Rates
The MAX221E maintains the RS-232 ±5.0V minimum
transmitter output voltage even at high data rates.
Figure 8 shows a transmitter loopback test circuit.
Figure 9 shows the loopback test result at 120kbps,
and Figure 10 shows the same test at 250kbps.
5V/div
FORCEON =
FORCEOFF
TOUT
5V/div
50
μ
s/div
TIN = V
CC
TIN = GND
Figure 7. Transmitter Output when Exiting Shutdown or
Powering Up
MAX221E
5k
RIN
ROUT
EN
C2-
C2+
C1-
C1+
V-
V+
V
CC
C4
C3
C1
C2
0.1
μ
F
+5V
FORCEOFF
TOUT
TIN
GND
V
CC
1000pF
0V
FORCEON
INVALID
Figure 8. Loopback Test Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX221EEUE+ | 功能描述:RS-232接口集成電路 15kV ESD-Protected 5V 1uA RS-232 Trx 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: |
| MAX221EEUE+T | 功能描述:RS-232接口集成電路 15kV ESD-Protected 5V 1uA RS-232 Trx 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: |
| MAX221EEUE-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: |
| MAX221EUE | 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: |
| MAX221EUE+ | 功能描述:RS-232接口集成電路 5V 1uA Single RS-232 Txr w/AutoShut 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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