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ISL3241E Fiches technique(PDF) 9 Page - Intersil Corporation

No de pièce ISL3241E
Description  QFN Packaged, 짹15kV ESD Protected, 2.7V to 3.6V, 250kbps, RS-232 Transmitters/Receivers with Separate Logic Supply Pin
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Fabricant  INTERSIL [Intersil Corporation]
Site Internet  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL3241E Fiches technique(HTML) 9 Page - Intersil Corporation

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9
FN6768.1
May 13, 2010
ISL324xE monitor receivers remain active even during
manual powerdown, making them extremely useful for Ring
Indicator monitoring. Standard receivers driving powered
down peripherals must be disabled to prevent current flow
through the peripheral’s protection diodes (see Figures 5
and 6). This renders them useless for wake up functions, but
the corresponding monitor receiver can be dedicated to this
task as shown in Figure 6.
Low Power Operation
These 3V devices require a nominal supply current of
0.3mA, even at VCC = 3.6V, during normal operation (not in
power-down mode). This is considerably less than the 5mA
to 11mA current required by comparable 5V RS-232 devices,
allowing users to reduce system power simply by switching
to this new family.
Power-down Functionality
The already low current requirement drops significantly
when the device enters powerdown mode. In powerdown,
supply current drops to less than 1µA, because the on-chip
charge pump turns off (V+ collapses to VCC, V- collapses to
GND), and the transmitter outputs three-state. Inverting
receiver outputs disable only in manual powerdown
(ISL3243E) or when EN = VL (ISL3241E); refer to Table 2 for
details. This micro-power mode makes the ISL324xE ideal
for battery powered and portable applications.
TABLE 2. POWER-DOWN AND ENABLE LOGIC TRUTH TABLE (NOTE: “H” = VL)
RS-232
SIGNAL
PRESENT
AT
RECEIVER
INPUT?
SHDN OR
FORCEOFF
INPUT
FORCEON
INPUT
EN
INPUT
TRANSMITTER
OUTPUTS
RECEIVER
OUTPUTS
ROUTB
OUTPUTS
INVALID
OUTPUT
MODE OF OPERATION
ISL3241E
N/A
L
N/A
L
High-Z
Active
Active
N/A
Manual Power-down
N/A
L
N/A
H
High-Z
High-Z
Active
N/A
Manual Power-down 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
ISL3243E
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 Power-down Enabled)
NO
H
L
N.A.
High-Z
Active
Active
L
Power-down Due to Auto Power-down
Logic
YES
L
X
N.A.
High-Z
High-Z
Active
H
Manual Power-down
NO
L
X
N.A.
High-Z
High-Z
Active
L
Manual Power-down
FIGURE 5. POWER DRAIN THROUGH POWERED DOWN
PERIPHERAL
OLD
VCC
POWERED
GND
SHDN = GND
VCC
Rx
Tx
CURRENT
VOUT = VCC
FLOW
RS-232 CHIP
DOWN
UART
VCC
ISL3241E, ISL3243E


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