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參數(shù)資料
| 型號： | ISL4243EIR |
| 廠商： | Intersil |
| 文件頁數(shù)： | 14/14頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS232 2.7-5.5VESD 32-QFN |
| 標準包裝： | 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 ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-VFQFN 裸露焊盤 |
| 供應商設(shè)備封裝： | 32-QFN 裸露焊盤（5x5） |
| 包裝： | 管件 |
9
FN8037.7
June 10, 2010
Software Controlled (Manual) Power-down
Most devices in the ISL4241E, ISL4243E family provide pins
that allow the user to force the IC into the low power, standby
state.
On the ISL4241E, the power-down control is via a simple
shutdown (SHDN) pin. Driving this pin high enables normal
operation, while driving it low forces the IC into it’s
power-down state. Connect SHDN to VCC if the power-down
function isn’t needed. Note that all the receiver outputs
remain enabled during shutdown (see Table 2). For the
lowest power consumption during power-down, the receivers
should also be disabled by driving the EN input high (see
The ISL4243E utilize a two pin approach where the
FORCEON and FORCEOFF inputs determine the IC’s
mode. For always enabled operation, FORCEON and
FORCEOFF are both strapped high. To switch between
active and power-down modes, under logic or software
control, only the FORCEOFF input need be driven. The
FORCEON state isn’t critical, as FORCEOFF dominates
over FORCEON. Nevertheless, if strictly manual control over
power-down is desired, the user must strap FORCEON high
to disable the automatic power-down circuitry. The ISL4243E
inverting (standard) receiver outputs also disable when the
device is in manual power-down, thereby eliminating the
possible current path through a shutdown peripheral’s input
Connecting FORCEOFF and FORCEON together disables
the automatic power-down feature, enabling them to function
as a manual SHUTDOWN input (see Figure 4).
With any of the previous mentioned control schemes, the
time required to exit power-down, and resume transmission
is only 100s. A mouse, or other application, may need more
time to wake up from shutdown. If automatic power-down is
being utilized, the RS-232 device will reenter power-down if
valid receiver levels aren’t reestablished within 30s of the
ISL4243E powering up. Figure 5 illustrates a circuit that
keeps the ISL4243E from initiating automatic power-down
for 100ms after powering up. This gives the slow-to-wake
peripheral circuit time to reestablish valid RS-232 output
levels.
INVALID Output (ISL4243E Only)
The INVALID output always indicates whether or not a valid
RS-232 signal (see Figure 6) 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
FIGURE 3. DISABLED RECEIVERS PREVENT POWER DRAIN
ISL4241E
TRANSITION
RX
TX
R2OUTB
R2OUT
T1IN
FORCEOFF = GND
VCC
TO
R2IN
T1OUT
VOUT = HI-Z
POWERED
DETECTOR
DOWN
UART
WAKE-UP
LOGIC
OR
SHDN = GND, EN = VCC
ISL4243E
FIGURE 4. CONNECTIONS FOR MANUAL POWER-DOWN
WHEN NO VALID RECEIVER SIGNALS ARE
PRESENT
PWR
FORCEOFF
INVALID
CPU
I/O
FORCEON
ISL4243E
MGT
LOGIC
UART
FIGURE 5. CIRCUIT TO PREVENT AUTO POWER-DOWN
FOR 100ms AFTER FORCED POWERUP
ISL4243E
FORCEOFF
FORCEON
POWER
MASTER POWER-DOWN LINE
1M
Ω
0.1F
MANAGEMENT
UNIT
ISL4241E, ISL4243E
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL4243EIR-T | 功能描述:IC 3DRVR/5RCVR RS232 3V 32-QFN RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:25 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:4.5 V ~ 5.5 V 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 供應商設(shè)備封裝:16-PDIP 包裝:管件 |
| ISL4243EIRZ | 功能描述:RS-232接口集成電路 RS232 3V 3D/5R 15KV AUTODWN 32QFN IND RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| ISL4243EIRZ-T | 功能描述:RS-232接口集成電路 RS232 3V 3D/5R 15KV AUTODWN 32QFN IND RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| ISL4244E | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:QFN Packaged, ±15kV ESD Protected, +2.7V to +5.5V, 10Nanoamp, 250kbps/1Mbps, RS-232 Transceivers with Enhanced Automatic Power-down |
| ISL4244EIR | 功能描述:IC 3DRVR/5RCVR RS232 3V 32-QFN RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:25 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:4.5 V ~ 5.5 V 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 供應商設(shè)備封裝:16-PDIP 包裝:管件 |
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