ICL3244E Intersil Corporation, ICL3244E Datasheet - Page 9

• Manufacturer Part Number: ICL3244E
• Description: (ICL3224E - ICL3244E) RS-232 Transceivers
• Manufacturer: Intersil Corporation

The ICL3244E inverting receivers disable during forced
(manual) powerdown, but not during automatic powerdown
(see Table 2). Conversely, the monitor receiver remains
active even during manual powerdown making it extremely
useful for Ring Indicator monitoring. Standard receivers
NOTES:
ICL3224E, ICL3226E
ICL322XE - INVALID DRIVING FORCEON AND FORCEOFF (EMULATES AUTOMATIC POWERDOWN)
ICL3244E
ICL3244E - INVALID DRIVING FORCEON AND FORCEOFF (EMULATES AUTOMATIC POWERDOWN)
3. Applies only to the ICL3244E.
4. Input is connected to INVALID Output.
WITHIN 30
RCVR OR
XMTR
EDGE
SEC?
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
X
X
X
X
X
X
X
X
FORCEOFF
NOTE 4
NOTE 4
NOTE 4
NOTE 4
INPUT
H
H
H
H
H
H
H
H
H
H
H
H
L
L
L
L
FORCEON
NOTE 4
NOTE 4
NOTE 4
NOTE 4
INPUT
9
H
H
X
X
H
H
X
X
L
L
L
L
L
L
L
L
TRANSMITTER
OUTPUTS
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
TABLE 2. POWERDOWN LOGIC TRUTH TABLE
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
ICL3224E, ICL3226E, ICL3244E
RECEIVER
OUTPUTS
High-Z
High-Z
High-Z
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
OUTPUTS
(NOTE 3)
R
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
OUTB
N.A.
N.A.
N.A.
N.A.
N.A.
N.A.
N.A.
N.A.
N.A.
N.A.
driving powered down peripherals must be disabled to
prevent current flow through the peripheral’s protection
diodes (see Figures 2 and 3). This renders them useless for
wake up functions, but the corresponding monitor receiver
can be dedicated to this task as shown in Figure 3.
RECEIVER
PRESENT
INPUT?
RS-232
LEVEL
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
AT
OUTPUT
INVALID
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
L
L
Normal Operation (Enhanced
Auto Powerdown Disabled)
Normal Operation (Enhanced
Auto Powerdown Enabled)
Powerdown Due to Enhanced
Auto Powerdown Logic
Manual Powerdown
Normal Operation
Forced Auto Powerdown
Normal Operation (Enhanced
Auto Powerdown Disabled)
Normal Operation (Enhanced
Auto Powerdown Enabled)
Powerdown Due to Enhanced
Auto Powerdown Logic
Manual Powerdown
Normal Operation
Forced Auto Powerdown
MODE OF OPERATION