FN4910.21 February 22, 2010 The INVALID output always indicates whether or not a valid RS-232 signal is present at any of the receiver inputs (" />
參數(shù)資料
型號(hào)： ICL3222ECV-T
廠商： Intersil
文件頁數(shù)： 8/33頁
文件大?。?/td> 0K
描述： IC 2DRVR/2RCVR RS232 3V 20-TSSOP
標(biāo)準(zhǔn)包裝： 2,500
類型： 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 2/2
規(guī)程： RS232
電源電壓： 3 V ~ 5.5 V
安裝類型： 表面貼裝
封裝/外殼： 20-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 20-TSSOP
包裝： 帶卷 (TR)
16
FN4910.21
February 22, 2010
The INVALID output always indicates whether or not a
valid RS-232 signal is present at any of the receiver
inputs (see Table 2), giving the user an easy way to
determine when the interface block should power
down. In the case of a disconnected interface cable
where all the receiver inputs are floating (but pulled to
GND by the internal receiver pull down resistors), the
INVALID logic detects the invalid levels and drives the
output low. The power management logic then uses
this indicator to power down the interface block.
Reconnecting the cable restores valid levels at the
receiver inputs, INVALID switches high, and the power
management logic wakes up the interface block.
INVALID can also be used to indicate the DTR or RING
INDICATOR signal, as long as the other receiver inputs
are floating, or driven to GND (as in the case of a
powered down driver). Connecting FORCEOFF and
FORCEON together disables the automatic power-down
feature, enabling them to function as a manual
SHUTDOWN input (see Figure 4).
ICL3221E, ICL3223E
No
H
L
Active
N/A
L
Normal Operation
(Auto Power-Down Disabled)
No
H
Active
High-Z
N/A
L
Yes
H
L
Active
N/A
H
Normal Operation
(Auto Power-Down Enabled)
Yes
H
L
H
Active
High-Z
N/A
H
No
H
L
High-Z
Active
N/A
L
Power-Down Due to Auto
Power-Down Logic
No
H
L
H
High-Z
N/A
L
Yes
L
X
L
High-Z
Active
N/A
H
Manual Power-Down
Yes
L
X
H
High-Z
N/A
H
Manual Power-Down
with Receiver Disabled
No
L
X
L
High-Z
Active
N/A
L
Manual Power-Down
No
L
X
H
High-Z
N/A
L
Manual Power-Down
with Receiver Disabled
ICL3243E
No
H
N/A
Active
L
Normal Operation
(Auto Power-Down Disabled)
Yes
H
L
N/A
Active
H
Normal Operation
(Auto Power-Down Enabled)
No
H
L
N/A
High-Z
Active
L
Power-Down Due to Auto
Power-Down Logic
Yes
L
X
N/A
High-Z
Active
H
Manual Power-Down
No
L
X
N/A
High-Z
Active
L
Manual Power-Down
NOTE:
7. Applies only to the ICL3241E and ICL3243E.
TABLE 2. POWER-DOWN AND ENABLE LOGIC TRUTH TABLE (Continued)
RS-232
SIGNAL
PRESENT
AT
RECEIVER
INPUT?
FORCEOFF
OR SHDN
INPUT
FORCEON
INPUT
EN
INPUT
TRANSMITTER
OUTPUTS
RECEIVER
OUTPUTS
ROUTB
OUTPUTS
(NOTE 7)
INVALID
OUTPUT
MODE OF
OPERATION
FIGURE 2. POWER DRAIN THROUGH POWERED
DOWN PERIPHERAL
OLD
VCC
POWERED
GND
SHDN = GND
VCC
Rx
Tx
VCC
CURRENT
VOUT = VCC
FLOW
RS-232 CHIP
DOWN
UART
ICL3221E, ICL3222E, ICL3223E, ICL3232E, ICL3241E, ICL3243E
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