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參數(shù)資料
| 型號： | MAX221EUE+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TX RS232 5V 1UA SHTDN 16TSSOP |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 類型： | 收發(fā)器 |
| 驅動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | RS232 |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-TSSOP（0.173"，4.40mm 寬） |
| 供應商設備封裝： | 16-TSSOP |
| 包裝： | 帶卷 (TR) |
MAX221
+5V, 1A, Single RS-232 Transceiver
with AutoShutdown
6
_______________________________________________________________________________________
Table 1. Output Control Truth Table
1
No
Shutdown
(AutoShutdown)
High-Z
1
High-Z
0
1
OPERATION
STATUS
X
0
VALID
RECEIVER
LEVEL
EN
X
Shutdown
(Forced Off)
X
Normal Operation
(Forced On)
X
0
Yes
Normal Operation
(AutoShutdown)
No
Yes
0
High-Z
Active
High-Z
TOUT
Active
High-Z
Active
0
FORCEOFF
1
0
1
High-Z
Active
ROUT
High-Z
Active
X
FORCEON
1
X
1
0
X = Don’t care
RS-232 SIGNAL PRESENT
AT RECEIVER INPUT
INVALID OUTPUT
Yes
High
No
Low
Table 2. INVALID Truth Table
+0.3V
-0.3V
INVALID
TO MAX221
POWER SUPPLY
AND TRANSMITTER
RIN
* TRANSMITTER IS DISABLED, REDUCING SUPPLY CURRENT TO 1
A IF
RECEIVER INPUT IS BETWEEN +0.3V AND -0.3V FOR AT LEAST 30
s.
30
s
COUNTER
R
+2.7V
-2.7V
INVALID
TO MAX221
POWER SUPPLY
RIN
* TRANSMITTER IS ENABLED IF:
RECEIVER INPUT IS GREATER THAN +2.7V OR LESS THAN -2.7V;
RECEIVER INPUT HAS BEEN BETWEEN +0.3V AND -0.3V FOR LESS THAN 30
s.
30s
COUNTER
R
Figure 2b. Transmitter Enabled Using AutoShutdown
Figure 2a. Entering 1A Supply Mode via AutoShutdown
FORCEOFF
POWER DOWN
INVALID
FORCEON
INVALID IS AN INTERNALLY GENERATED SIGNAL USED BY
THE AUTOSHUTDOWN LOGIC AND APPEARS AS AN OUTPUT.
POWER DOWN IS ONLY AN INTERNAL SIGNAL. IT CONTROLS THE
OPERATIONAL STATUS OF THE TRANSMITTER AND POWER SUPPLIES.
Figure 2c. AutoShutdown Logic
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