参数资料
| 型号： | ICL3226CAZ-T |
| 厂商： | Intersil |
| 文件页数： | 2/18页 |
| 文件大小： | 0K |
| 描述： | IC 1DRVR/1RCVR RS232 3V 16-SSOP |
| 标准包装： | 1,000 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 带卷 (TR) |
10
FN4876.10
March 1, 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
30sec
TIMER
S
R
FORCEOFF
AUTOSHDN
FORCEON
R_IN
T_IN
EDGE
DETECT
EDGE
DETECT
ICL3224, ICL3226, ICL3238, ICL3244
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICL3226E | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:+/-15kV ESD Protected, +3V to +5.5V, 1Microamp, 250kbps, RS-232 Transceivers with Enhanced Automatic Powerdown |
| ICL3226ECA | 功能描述:IC TXRX RS-232 3-5.5V ESD 16SSOP RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:2,500 系列:- 类型:驱动器 驱动器/接收器数:4/0 规程:RS422 电源电压:4.5 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:带卷 (TR) |
| ICL3226ECA-T | 功能描述:IC 1DRVR/1RCVR RS232 3V 16-SSOP RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:1,000 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-SOIC（0.295"，7.50mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| ICL3226ECAZ | 功能描述:RS-232接口集成电路 RS232 3V 1D/1R 15KV E-DWN COM RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| ICL3226ECAZ-T | 功能描述:RS-232接口集成电路 RS232 3V 1D/1R 15KV E-DWN COMEL RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
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