- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄9609 > ICL3225CA (Intersil)IC 2DRVR/2RCVR RS232 3V 20-SSOP PDF資料下載
參數(shù)資料
| 型號： | ICL3225CA |
| 廠商： | Intersil |
| 文件頁數(shù)： | 18/18頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC 2DRVR/2RCVR RS232 3V 20-SSOP |
| 標準包裝： | 66 |
| 類型： | 收發(fā)器 |
| 驅動器/接收器數(shù)： | 2/2 |
| 規(guī)程： | RS232 |
| 電源電壓： | 3 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SSOP（0.209"，5.30mm 寬） |
| 供應商設備封裝： | 20-SSOP |
| 包裝： | 管件 |
9
FN4878.8
February 27, 2006
With any of the above control schemes, the time required to
exit powerdown, and resume transmission is only 100
s.
When using both manual and enhanced automatic powerdown
(FORCEON = 0), the ICL32XX 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 ICL32XX
powers up as soon as FORCEOFF switches high. The rising
edge of the Master Powerdown signal forces the device to
power up, and the ICL32XX returns to enhanced automatic
powerdown mode an RC time constant after this rising edge.
The time constant isn’t critical, because the ICL32XX 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.
INVALID Output
The INVALID output always indicates (see Table 2) whether or
not 30
s have elapsed with invalid RS-232 signals (see Figures
6 and 8) persisting on all of the receiver inputs, 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).
Enhanced Automatic Powerdown
Even greater power savings is available by using these
devices which feature an enhanced automatic powerdown
function. When the enhanced powerdown logic determines
that no transitions have occurred on any of the transmitter
nor receiver inputs for 30 seconds, the charge pump and
transmitters powerdown, thereby reducing supply current to
1
A. The ICL32XX automatically powers back up whenever
it detects a transition on one of these inputs. This automatic
powerdown feature provides additional system power
savings without changes to the existing operating system.
Enhanced automatic powerdown operates when the
FORCEON input is low, and the FORCEOFF input is high.
Tying FORCEON high disables automatic powerdown, but
manual powerdown is always available via the overriding
FORCEOFF input. Table 2 summarizes the enhanced
automatic powerdown functionality.
FIGURE 4. CONNECTIONS FOR MANUAL POWERDOWN
WHEN NO VALID RECEIVER SIGNALS ARE
PRESENT
PWR
FORCEOFF
INVALID
CPU
I/O
FORCEON
ICL32XX
MGT
LOGIC
UART
FIGURE 5. CIRCUIT TO ENSURE IMMEDIATE POWER UP
WHEN EXITING FORCED POWERDOWN
FORCEOFF
FORCEON
POWER
MASTER POWERDOWN LINE
1M
0.1
F
MANAGEMENT
UNIT
ICL32XX
FIGURE 6. DEFINITION OF VALID RS-232 RECEIVER LEVELS
0.3V
-0.3V
-2.7V
2.7V
INVALID LEVEL - INVALID = 0
VALID RS-232 LEVEL - INVALID = 1
INDETERMINATE
FIGURE 7. ENHANCED AUTOMATIC POWERDOWN LOGIC
30s
TIMER
S
R
FORCEOFF
AUTOSHDN
FORCEON
R_IN
T_IN
EDGE
DETECT
EDGE
DETECT
ICL3225, ICL3245
相關PDF資料 |
PDF描述 |
|---|---|
| ICL3223IV-T | IC 2DRVR/2RCVR RS232 3V 20-TSSOP |
| VI-J5D-MX-F3 | CONVERTER MOD DC/DC 85V 75W |
| VI-J64-MX-F3 | CONVERTER MOD DC/DC 48V 75W |
| VI-J63-MX-F4 | CONVERTER MOD DC/DC 24V 75W |
| ICL3224IA-T | IC 2DRVR/2RCVR RS232 3V 20-SSOP |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ICL3225CA-T | 功能描述:IC 2DRVR/2RCVR RS232 3V 20-SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:1,000 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:16-SOIC 包裝:帶卷 (TR) |
| ICL3225CAZ | 功能描述:RS-232接口集成電路 RS232 3V 2D/2R 1MBPS 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 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| ICL3225CAZ-T | 功能描述:RS-232接口集成電路 RS232 3V 2D/2R 1MBPS 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 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| ICL3225CP | 功能描述:IC 2DRVR/2RCVR RS232 3V 20-DIP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:1,000 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:16-SOIC 包裝:帶卷 (TR) |
| ICL3225CPZ | 功能描述:RS-232接口集成電路 RS232 3V 2D/2R E-DWN 20PDIP 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 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
發(fā)布緊急采購，3分鐘左右您將得到回復。