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參數(shù)資料
| 型號(hào)： | ICL3224E |
| 廠商： | Intersil Corporation |
| 英文描述： | ±15kV ESD Protected, +3V to +5.5V, 1Microamp, 250kbps, RS-232 Transceivers with Enhanced Automatic Powerdown(±15kV ESD 防護(hù), +3V至+5.5V, 1微安, 250kbps, RS-232收發(fā)器，具有增強(qiáng)型自動(dòng)關(guān)斷功能) |
| 中文描述： | ± 15kV的ESD保護(hù)，3V至5.5V，1Microamp，250kbps的，RS - 232接口的增強(qiáng)型自動(dòng)掉電（± 15kV的ESD防護(hù)，采用3V至5.5V的，1微安，250kbps的，RS - 232接口收發(fā)器，具有增強(qiáng)型自動(dòng)關(guān)收發(fā)器斷功能） |
| 文件頁數(shù)： | 10/20頁 |
| 文件大小： | 390K |
| 代理商： | ICL3224E |
10
Powerdown Functionality
This 3V family of RS-232 interface devices 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 these devices ideal
for battery powered and portable applications.
Software Controlled (Manual) Powerdown
These devices allow the user to force the IC into the low
power, standby state, and 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 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.
ICL3244E 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 ICL32XXE 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
ensuring that the ICL32XXE powers up as soon as
FORCEOFF switches high. The rising edge of the Master
Powerdown signal forces the device to power up, and the
ICL32XXE returns to enhanced automatic powerdown mode
an RC time constant after this rising edge. The time constant
isn’t critical, because the ICL32XXE remains powered up for
30 seconds after the FORCEON falling edge, even if there
are no signal transitions. This gives slow-to-wake systems
(e.g., a mouse) plenty of time to start transmitting, and as
long as it starts transmitting within 30 seconds both systems
remain enabled.
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
ICL3244E
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
ICL32XXE
UART
ICL3224E, ICL3226E, ICL3244E
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICL3224E_06 | 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 |
| ICL3224ECA | 制造商:Rochester Electronics LLC 功能描述:RS232 3V 2D/2R 15KV E-DWN 20SSOP COM - Bulk 制造商:Intersil Corporation 功能描述: |
| ICL3224ECAZ | 功能描述:RS-232接口集成電路 W/ANNEAL RS232 3V 2D /2R 15KV E-DWN COM 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(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| ICL3224ECAZ-T | 功能描述:RS-232接口集成電路 W/ANNEAL RS232 3V 2D /2R 15KV E-DWN COM 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(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| ICL3224ECP | 制造商:Rochester Electronics LLC 功能描述:RS232 3V 2D/2R 15KV E-DWN 20PDIP COM - Bulk |
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