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參數(shù)資料
| 型號(hào)： | ICL3244CB |
| 廠商： | INTERSIL CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | 1Microamp, +3V to +5.5V, 250kbps, RS-232 Transceiver with Enhanced Automatic Powerdown |
| 中文描述： | TRIPLE LINE TRANSCEIVER, PDSO28 |
| 封裝： | PLASTIC, EXPOSED PAD, SOIC-28 |
| 文件頁(yè)數(shù)： | 6/13頁(yè) |
| 文件大?。?/td> | 141K |
| 代理商： | ICL3244CB |
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4-6
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.
Powerdown Functionality
This 3V RS-232 interface device requires a nominal supply
current of 0.3mA during normal operation (not in powerdown
mode). This is considerably less than the 5mA to 11mA
current required of 5V RS-232 devices. The already low
current requirement drops significantly when the device
enters powerdown mode. In powerdown, supply current
drops to 1
μ
A, because the on-chip charge pump turns off
(V+ collapses to V
CC
, V- collapses to GND), and the
transmitter outputs three-state. Inverting receiver outputs
may or may not disable in powerdown; refer to Table 2 for
details. This micro-power mode makes this device ideal for
battery powered and portable applications.
Software Controlled (Manual) Powerdown
The ICL3244 allows the user to force the IC into the low
power, standby state, and utilizes 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 powerdown 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
powerdown is desired, the user must strap FORCEON high
to disable the enhanced automatic powerdown circuitry.
ICL3244 inverting (standard) receiver outputs also disable
when the device is in powerdown, thereby eliminating the
possible current path through a shutdown peripheral’s input
protection diode (see Figures 2 and 3).
Connecting FORCEOFF and FORCEON together disables
the enhanced automatic powerdown feature, enabling them
to function as a manual SHUTDOWN input (see Figure 4).
With any of the above control schemes, the time required to
exit powerdown, and resume transmission is only 100
μ
s.
When using both manual and enhanced automatic
powerdown (FORCEON = 0), the ICL3244 won’t power up
from manual powerdown until both FORCEOFF and
FORCEON are driven high, or until a transition occurs on a
receiver or transmitter input. Figure 5 illustrates a circuit for
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
V
CC
Rx
Tx
V
CC
CURRENT
FLOW
V
OUT
= V
CC
RS-232 CHIP
FIGURE 3. DISABLED RECEIVERS PREVENT POWER DRAIN
ICL3244
TRANSITION
DETECTOR
R
X
T
X
R2
OUTB
R2
OUT
T1
IN
FORCEOFF = GND
V
CC
V
CC
TO
R2
IN
T1
OUT
V
OUT
= HI-Z
POWERED
DOWN
UART
WAKE-UP
LOGIC
FIGURE 4. CONNECTIONS FOR MANUAL POWERDOWN
WHEN NO VALID RECEIVER SIGNALS ARE
PRESENT
PWR
MGT
LOGIC
FORCEOFF
INVALID
CPU
I/O
FORCEON
ICL3244
UART
ICL3244
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICL3244CV | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ICL3244E | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:+/-15kV ESD Protected, +3V to +5.5V, 1Microamp, 250kbps, RS-232 Transceivers with Enhanced Automatic Powerdown |
| ICL3244ECA | 功能描述:IC 3DRVR/5RCVR RS232 3V 28-SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:25 系列:- 類型:收發(fā)器 驅(qū)動(dòng)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(yīng)商設(shè)備封裝:16-PDIP 包裝:管件 |
| ICL3244ECA-T | 功能描述:IC 3DRVR/5RCVR RS232 3V 28-SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:25 系列:- 類型:收發(fā)器 驅(qū)動(dòng)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(yīng)商設(shè)備封裝:16-PDIP 包裝:管件 |
| ICL3244ECA-TS2705 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
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