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參數(shù)資料
| 型號： | ISL4221E |
| 廠商： | Intersil Corporation |
| 英文描述： | QFN Packaged, +/-15kV ESD Protected, +2.7V to +5.5V, 150Nanoamp, 250kbps, RS-232 Transmitters/Receivers(QFN 封裝, +/-15kV ESD 防護(hù), +2.7V至+5.5V, 150毫微安, 250kbps, RS-232收發(fā)器) |
| 中文描述： | QFN封裝，/ - 15kV的ESD保護(hù)，2.7V至5.5V，150Nanoamp，250kbps的和RS - 232發(fā)送器/接收器封裝（QFN封裝，/ - 15kV的ESD防護(hù)，為2.7V至5.5V的，150毫微安，250kbps的，的RS - 232收發(fā)器） |
| 文件頁數(shù)： | 7/13頁 |
| 文件大?。?/td> | 401K |
| 代理商： | ISL4221E |
7
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 automatic powerdown circuitry.
Connecting FORCEOFF and FORCEON together disables
the automatic powerdown feature, enabling them to function
as a manual SHUTDOWN input (see Figure 4).
The time to recover from automatic powerdown mode is
typically 100
μ
s.
Automatic Powerdown
Even greater power savings is available by using the
automatic
powerdown function. When no valid RS-232
voltages (see Figure 6) are sensed on any receiver input for
30
μ
s, the charge pump and transmitters powerdown, thereby
reducing supply current to 10nA. Invalid receiver levels occur
whenever the driving peripheral’s outputs are shut off
(powered down) or when the RS-232 interface cable is
disconnected. The ISL422XE powers back up whenever it
detects a valid RS-232 voltage level on any receiver input.
This automatic powerdown feature provides additional
system power savings without changes to the existing
operating system.
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 automatic powerdown functionality.
Some applications may need more time to wake up from
shutdown. If automatic powerdown is being utilized, the RS-
232 device will reenter powerdown if valid receiver levels
aren’t reestablished within 30
μ
s of the ISL422XE powering
up. Figure 5 illustrates a circuit that keeps the ISL422XE
TABLE 2. POWERDOWN AND ENABLE LOGIC TRUTH TABLE
RS-232 SIGNAL
PRESENT AT
RECEIVER INPUT
FORCEOFF
INPUT
FORCEON
INPUT
EN
INPUT
TRANSMITTER
OUTPUTS
RECEIVER
OUTPUTS
INVALID
OUTPUT
MODE OF OPERATION
NO
H
H
L
Active
Active
L
Normal Operation
(Auto Powerdown Disabled)
NO
H
H
H
Active
High-Z
L
YES
H
L
L
Active
Active
H
Normal Operation
(Auto Powerdown Enabled)
YES
H
L
H
Active
High-Z
H
NO
H
L
L
High-Z
Active
L
Powerdown Due to Auto Powerdown
Logic
NO
H
L
H
High-Z
High-Z
L
YES
L
X
L
High-Z
Active
H
Manual Powerdown
YES
L
X
H
High-Z
High-Z
H
Manual Powerdown w/Rcvr. Disabled
NO
L
X
L
High-Z
Active
L
Manual Powerdown
NO
L
X
H
High-Z
High-Z
L
Manual Powerdown w/Rcvr. Disabled
FIGURE 4. CONNECTIONS FOR MANUAL POWERDOWN
WHEN NO VALID RECEIVER SIGNALS ARE
PRESENT
PWR
MGT
LOGIC
FORCEOFF
INVALID
CPU
I/O
FORCEON
ISL422XE
UART
FIGURE 5. CIRCUIT TO PREVENT AUTO POWERDOWN FOR
100ms AFTER FORCED POWERUP
ISL422XE
FORCEOFF
FORCEON
POWER
MANAGEMENT
UNIT
MASTER POWERDOWN LINE
1M
0.1
μ
F
ISL4221E, ISL4223E
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL4223E | QFN Packaged, +/-15kV ESD Protected, +2.7V to +5.5V, 150Nanoamp, 250kbps, RS-232 Transmitters/Receivers(QFN 封裝, +/-15kV ESD 防護(hù), +2.7V至+5.5V, 150毫微安, 250kbps, RS-232收發(fā)器) |
| ISL4221 | QFN Packaged, +/-15kV ESD Protected, +2.7V to +5.5V, 150Nanoamp, 250kBps, RS-232 Transmitters/Receivers |
| ISL4221EIR | QFN Packaged, +/-15kV ESD Protected, +2.7V to +5.5V, 150Nanoamp, 250kBps, RS-232 Transmitters/Receivers |
| ISL4221EIRZ-T | QFN Packaged, +/-15kV ESD Protected, +2.7V to +5.5V, 150Nanoamp, 250kBps, RS-232 Transmitters/Receivers |
| ISL4223EIR | RES, SM 1.3K OHM 1/10W 1% |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL4221E_07 | 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, 150nA, 250kBps, RS-232 Transmitters/Receivers |
| ISL4221EIR | 功能描述:IC TXRX RS232 2.7-5.5V ESD 16QFN RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:1,000 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: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(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
| ISL4221EIR-T | 功能描述:IC TXRX 1TX/1RX 3V RS-232 16-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(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 |
| ISL4221EIRZ | 功能描述:RS-232接口集成電路 3V RS-232 1TX/1RX -4 0+85 TRANS 16LD 5X5 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: |
| ISL4221EIRZ-T | 功能描述:IC XMITTER/RCVR ESD RS232 16-QFN RoHS:是 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(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:發(fā)射器 驅(qū)動器/接收器數(shù):4/0 規(guī)程:RS422，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
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