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參數(shù)資料
| 型號： | ISL3243EIRZ |
| 廠商： | Intersil |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS232 ESD-PROT 32-QFN |
| 產(chǎn)品培訓(xùn)模塊： | Solutions for Industrial Control Applications |
| 標(biāo)準(zhǔn)包裝： | 60 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 3/5 |
| 規(guī)程： | RS232 |
| 電源電壓： | 2.7 V ~ 3.6 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 32-QFN 裸露焊盤（5x5） |
| 包裝： | 管件 |
ISL3241E, ISL3243E
11
FN6768.2
June 18, 2012
to the supply voltage of the UART, ASIC, or controller
eliminates the need for a level shifter/translator between the
two ICs.
ISL324xE’s typical VIH and VIL levels for several VL values. Note
that the VL supply current increases significantly when
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 20s (see Figure 11).
INVALID switches back high 1s 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 20s, the charge pump and transmitters
power-down, thereby reducing supply current to less than 1A.
Invalid receiver levels occur whenever the driving peripheral’s
outputs are shut off (powered down) or when the RS-232
interface cable is disconnected. The ISL3243E powers back up
whenever it detects a valid RS-232 voltage level on any
receiver input. This automatic power-down feature provides
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 20ms
VALID RS-232 LEVEL - ISL3243E IS ACTIVE
INDETERMINATE - POWERDOWN MAY OR
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
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