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參數(shù)資料
| 型號： | ISL4238E |
| 廠商： | Intersil Corporation |
| 英文描述： | QFN Packaged, ±15kV ESD Protected, +2.7V to +5.5V, 10Nanoamp, 250kbps/1Mbps, RS-232 Transceivers with Enhanced Automatic Powerdown(QFN封裝, ±15kV ESD 防護, +2.7V至+5.5V, 10Nanoamp, 250kbps/1Mbps, 具有自動斷電功能的RS-232收發(fā)器) |
| 中文描述： | QFN封裝，具有± 15kV ESD保護，2.7V至5.5V，10Nanoamp，250kbps/1Mbps，RS - 232接口的增強型自動掉電封裝（QFN封裝，具有± 15kV ESD防護，收發(fā)器為2.7V至5.5V之間，10Nanoamp，250kbps/1Mbps，具有自動斷電功能的RS - 232接口收發(fā)器） |
| 文件頁數(shù)： | 9/17頁 |
| 文件大?。?/td> | 457K |
| 代理商： | ISL4238E |
9
Transmitter inputs on the ISL424XE float if left unconnected,
and may cause I
CC
increases. Connect unused inputs to
GND for the best performance. ISL4238E transmitter inputs
incorporate an active positive feedback resistor that
maintains the last input state in the absence of a forcing
signal, so unused transmitter inputs may be left
unconnected.
Receivers
ISL4238E/4XE devices contain standard inverting receivers
which can tristate via the FORCEOFF control line.
Additionally, they include a noninverting (monitor) receiver
(denoted by the R
OUTB
label) that is always active,
regardless of the state of any control lines. Both receiver
types convert RS-232 signals to CMOS output levels and
accept inputs up to
±
25V while presenting the required 3k
to 7k
input impedance (see Figure 1) even if the power is
off (V
CC
= 0V). The receivers’ Schmitt trigger input stage
uses hysteresis to increase noise immunity and decrease
errors due to slow input signal transitions.
The ISL4238E/4XE 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
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.
V
CC
Low Power Operation
These 3V devices require a nominal supply current of
0.3mA, even at V
CC
= 5.5V, during normal operation (not in
powerdown 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.
TABLE 2. POWERDOWN LOGIC TRUTH TABLE
RCVR OR
XMTR
EDGE
WITHIN 30
SEC
FORCEOFF
INPUT
FORCEON
INPUT
TRANSMITTER
OUTPUTS
RECEIVER
OUTPUTS
R
OUTB
OUTPUTS
RS-232
LEVEL
PRESENT
AT
RECEIVER
INPUT
INVALID
OUTPUT
MODE OF OPERATION
NO
H
H
Active
Active
Active
NO
L
Normal Operation (Enhanced
Auto Powerdown Disabled)
NO
H
H
Active
Active
Active
YES
H
YES
H
L
Active
Active
Active
NO
L
Normal Operation (Enhanced
Auto Powerdown Enabled)
YES
H
L
Active
Active
Active
YES
H
NO
H
L
High-Z
Active
Active
NO
L
Powerdown Due to Enhanced
Auto Powerdown Logic
NO
H
L
High-Z
Active
Active
YES
H
X
L
X
High-Z
High-Z
Active
NO
L
Manual Powerdown
X
L
X
High-Z
High-Z
Active
YES
H
INVALID DRIVING FORCEON AND FORCEOFF
(EMULATES AUTOMATIC POWERDOWN)
X
NOTE 8
NOTE 8
Active
Active
Active
YES
H
Normal Operation
X
NOTE 8
NOTE 8
High-Z
High-Z
Active
NO
L
Forced Auto Powerdown
NOTE:
8. Input is connected to INVALID Output.
R
XOUT
GND
≤
V
ROUT
≤
V
CC
5k
R
XIN
-25V
≤
V
RIN
≤
+25V
GND
V
CC
FIGURE 1. INVERTING RECEIVER CONNECTIONS
FIGURE 2. POWER DRAIN THROUGH POWERED DOWN
PERIPHERAL
OLD
V
CC
POWERED
DOWN
UART
GND
SHDN = GND
Rx
Tx
V
CC
CURRENT
FLOW
V
OUT
=
V
CC
RS-232 CHIP
ISL4238E, ISL4244E, ISL4245E
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