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參數(shù)資料
| 型號： | MAX3235ECWP+TG36 |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS-232 DL 20-SOIC |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 1,000 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 2/2 |
| 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： | 20-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 20-SOIC W |
| 包裝： | 帶卷 (TR) |
MAX3233E
/MAX3235E
±15kV ESD-Protected, 1A, 250kbps, 3.3V/5V, Dual
RS-232 Transceivers with Internal Capacitors
_______________________________________________________________________________________
7
applied to any RS-232 receiver or transmitter input. As a
result, the system saves power without changes to the
existing BIOS or operating system.
Figures 2a and 2b depict invalid and valid RS-232
receiver voltage levels. INVALID indicates the receiver
input’s condition, and is independent of FORCEON and
FORCEOFF states. Figure 2 and Tables 1 and 2 sum-
marize the operating modes. FORCEON and FORCE-
OFF override AutoShutdown Plus circuitry. When nei-
ther control is asserted, the IC selects between these
states automatically based on the last receiver or trans-
mitter input edge received.
When shut down, the device’s charge pumps turn off,
V+ is pulled to VCC, V- is pulled to ground, and the
transmitter outputs are high impedance. The time
required to exit shutdown is typically 100s (Figure 7).
Table 1. Output Control Truth Table
X = Don’t care
* INVALID
connected to FORCEON
** INVALID
connected to FORCEON and FORCEOFF
OPERATION STATUS
FORCEON
FORCEOFF
VALID
RECEIVER
LEVEL
Rx or Tx EDGE
WITHIN 30sec
T_OUT
R_OUT
Shutdown (Forced Off)
X
0
X
High-Z
Active
Normal Operation (Forced On)
1
X
Active
Normal Operation
(AutoShutdown Plus)
0
1
X
Yes
Active
Shutdown
(AutoShutdown Plus)
0
1
X
No
High-Z
Active
Normal Operation
INVALID*
1
Yes
X
Active
Normal Operation
INVALID*
1
X
Yes
Active
Shutdown
INVALID*
1
No
High-Z
Active
Normal Operation
(AutoShutdown)
INVALID*
INVALID**
Yes
X
Active
Shutdown (AutoShutdown)
INVALID*
INVALID**
No
X
High-Z
Active
AUTOSHDN*
R_IN
T_IN
R
S
30sec
TIMER
EDGE
DETECT
EDGE
DETECT
FORCEOFF
FORCEON
*AUTOSHDN IS ONLY AN INTERNAL SIGNAL.
Figure 2c. AutoShutdown Plus Logic
POWERDOWN*
AUTOSHDN
FORCEOFF
FORCEON
POWERDOWN IS ONLY AN INTERNAL SIGNAL. IT CONTROLS THE OPERATIONAL
STATUS OF THE TRANSMITTERS AND THE POWER SUPPLIES.
*
Figure 2d. Power-Down Logic
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