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參數資料
| 型號： | ICL3241 |
| 廠商： | Intersil Corporation |
| 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 |
| 文件頁數： | 12/17頁 |
| 文件大小： | 173K |
| 代理商： | ICL3241 |
3-12
The FORCEON state isn’t critical, as FORCEOFF
dominates over FORCEON. Nevertheless, if strictly manual
control over powerdown is desired, the user must strap
FORCEON high to disable the automatic powerdown
circuitry. Inverting (standard) receiver outputs also disable
when the device is in powerdown, thereby eliminating the
possible current path through a shutdown peripheral’s input
protection diode (see Figures 2 and 3).
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 powerdown feature, enabling them to function as
a manual SHUTDOWN input (see Figure 4).
TABLE 2. POWERDOWN AND ENABLE LOGIC TRUTH TABLE
RS-232
SIGNAL
PRESENT
AT
RECEIVER
INPUT
FORCEOFF
OR SHDN
INPUT
FORCEON
INPUT
EN
INPUT
TRANSMITTER
OUTPUTS
RECEIVER
OUTPUTS
(NOTE 4)
R
OUTB
OUTPUTS
INVALID
OUTPUT
MODE OF OPERATION
ICL3222, ICL3241
N.A.
L
N.A.
L
High-Z
Active
Active
N.A.
Manual Powerdown
N.A.
L
N.A.
H
High-Z
High-Z
Active
N.A.
Manual Powerdown w/Rcvr. Disabled
N.A.
H
N.A.
L
Active
Active
Active
N.A.
Normal Operation
N.A.
H
N.A.
H
Active
High-Z
Active
N.A.
Normal Operation w/Rcvr. Disabled
ICL3221, ICL3223
NO
H
H
L
Active
Active
N.A.
L
Normal Operation
(Auto Powerdown Disabled)
NO
H
H
H
Active
High-Z
N.A.
L
YES
H
L
L
Active
Active
N.A.
H
Normal Operation
(Auto Powerdown Enabled)
YES
H
L
H
Active
High-Z
N.A.
H
NO
H
L
L
High-Z
Active
N.A.
L
Powerdown Due to Auto Powerdown
Logic
NO
H
L
H
High-Z
High-Z
N.A.
L
YES
L
X
L
High-Z
Active
N.A.
H
Manual Powerdown
YES
L
X
H
High-Z
High-Z
N.A.
H
Manual Powerdown w/Rcvr. Disabled
NO
L
X
L
High-Z
Active
N.A.
L
Manual Powerdown
NO
L
X
H
High-Z
High-Z
N.A.
L
Manual Powerdown w/Rcvr. Disabled
ICL3243
NO
H
H
N.A.
Active
Active
Active
L
Normal Operation
(Auto Powerdown Disabled)
YES
H
L
N.A.
Active
Active
Active
H
Normal Operation
(Auto Powerdown Enabled)
NO
H
L
N.A.
High-Z
Active
Active
L
Powerdown Due to Auto Powerdown
Logic
YES
L
X
N.A.
High-Z
High-Z
Active
H
Manual Powerdown
NO
L
X
N.A.
High-Z
High-Z
Active
L
Manual Powerdown
NOTE:
4. Applies only to the ICL3241 and ICL3243.
ICL3221 thru ICL3243
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