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ISL3241EIRZ-T 数据表(PDF) 11 Page - Intersil Corporation

部件名 ISL3241EIRZ-T
功能描述  QFN Packaged, 짹15kV ESD Protected, 2.7V to 3.6V, 250kbps, RS-232 Transmitters/Receivers with Separate Logic Supply Pin
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制造商  INTERSIL [Intersil Corporation]
网页  http://www.intersil.com/cda/home
标志 INTERSIL - Intersil Corporation

ISL3241EIRZ-T 数据表(HTML) 11 Page - Intersil Corporation

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11
FN6768.1
May 13, 2010
receiver output high voltage, to values compatible with the
logic device’s I/O levels. Tailoring the ISL324XE’s logic pin
input switching points and output levels to the supply voltage
of the UART, ASIC, or µcontroller eliminates the need for a
level shifter/translator between the two ICs.
VL may range from 1.6V to VCC, and Table 3 indicates the
ISL324xE’s typical VIH and VIL levels for several VL values.
Note that the VL supply current increases significantly when
VL exceeds VCC (see Figure 20).
If logic translation isn’t required, connect VL to VCC.
INVALID Output (ISL3243E Only)
The INVALID output always indicates whether or not a valid
RS-232 signal (see Figure 10) 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.
Invalid receiver levels occur whenever the driving
peripheral’s outputs are shut off (powered down) or when the
RS-232 interface cable is disconnected. 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).
INVALID switches low after invalid levels have persisted on
all of the receiver inputs for more than 20µs (see Figure 11).
INVALID switches back high 1µs after detecting a valid
RS-232 level on a receiver input. INVALID operates in all
modes (forced or automatic power-down, or forced on), so it
is also useful for systems employing manual power-down
circuitry. When automatic powerdown is utilized, INVALID = 0
indicates that the ISL3243E is in powerdown mode.
Automatic Power-down (ISL3243E Only)
Even greater power savings is available by using the
ISL3243E which features an automatic power-down
function. When no valid RS-232 voltages (see Figure 11) are
sensed on any receiver input for 20µs, the charge pump and
TABLE 3. VIH AND VIL vs VL FOR VCC = 3.3V
VL (V)
VIH (V)
VIL (V)
1.6
0.85
0.8
1.8
0.95
0.9
2.5
1.25
1.2
FIGURE 9. USING VL PIN TO ADJUST LOGIC LEVELS
GND
TXD
RXD
VCCL = +1.8V
UART/PROCESSOR
GND
TIN
ROUT
VCCI = +3.3V
RS-232 IC WITH NO
VOH ≥ 3V
GND
TXD
VCCL = +1.8V
UART/PROCESSOR
GND
VL
VCCI = +3.3V
ISL324xE
VOH ≤ 1.8V
VIH ≤ 1V
VOH ≤ 1.8V
VIH ≥ 2V
VOH ≤ 1.8V
VL PIN
TIN
ROUT
RXD
INPUT
DIODE
INPUT
DIODE
FIGURE 10. DEFINITION OF VALID RS-232 RECEIVER LEVELS
0.3V
-0.3V
-2.7V
2.7V
INVALID LEVEL - POWER-DOWN OCCURS AFTER 20
μs
VALID RS-232 LEVEL - ISL3243E IS ACTIVE
VALID RS-232 LEVEL - ISL3243E IS ACTIVE
INDETERMINATE - POWERDOWN MAY OR
INDETERMINATE - POWERDOWN MAY OR
MAY NOT OCCUR
MAY NOT OCCUR
RECEIVER
INPUTS
TRANSMITTER
OUTPUTS
INVALID
OUTPUT
V+
VCC
0
V-
VL
0
tINVL
tINVH
INVALID
REGION
}
FIGURE 11. AUTOMATIC POWERDOWN AND INVALID
TIMING DIAGRAMS
AUTOPWDN
PWR UP
ISL3241E, ISL3243E


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