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參數(shù)資料
| 型號(hào)： | ISL54224IRUZ-T |
| 廠商： | Intersil |
| 文件頁數(shù)： | 3/18頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MULTIPLEXER DUAL 2:1 10TQFN |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 功能： | 多路復(fù)用器 |
| 電路： | 2 x 2:1 |
| 導(dǎo)通狀態(tài)電阻： | 20 歐姆 |
| 電壓電源： | 單電源 |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 5.25 V |
| 電流 - 電源： | 45µA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-UFQFN |
| 供應(yīng)商設(shè)備封裝： | 10-UTQFN（1.8x1.40） |
| 包裝： | 帶卷 (TR) |
ISL54224
11
FN6969.1
September 19, 2013
LOGIC CONTROL
The state of the ISL54224 device is determined by the voltage at
the SEL pin and the OE/ALM pin. SEL is only active when the
OE/ALM pin is logic “1” (High). Refer to “Truth Table” on page 2.
The ISL54224 logic pins are designed to minimize current
consumption when the logic control voltage is lower than the VDD
supply voltage. With VDD = 3.6V and logic pins at 1.4V the part
typically draws only 25A. With VDD = 4.3V and logic pins at 2.6V
the part typically draws only 35A. Driving the logic pins to the
VDD supply rail minimizes power consumption.
The SEL pin and OE/ALM pin have special circuitry that allows
them to be driven with a voltage higher than the VDD supply
voltage. These pins can be driven up to 5.25V with a VDD supply
in the range of 2.7V to 5.25V.
The SEL pin and OE/ALM pin are internally pulled low through
4M resistors to ground and can be tri-stated by a Processor.
The OE/ALM pin is an open drain connection. It should be pulled
high through an external 100k pull-up resistor. The OE/ALM pin
can then be driven “Low” by a Processor to open all switches or
it can be monitored by the Processor for a “Low” when the part
goes into an over-voltage condition.
Logic Control Voltage Levels
HSD1 USB Channel
If the SEL pin = Logic “0” and the OE/ALM pin = Logic “1”,
high-speed Channel 1 will be ON. The HSD1- and HSD1+ switches
are ON and the HSD2- and HSD2+ switches are OFF (high
impedance).
When a computer or USB hub is plugged into the common USB
connector and Channel 1 is active, a link will be established
between the USB 1 transceiver section of the media player and
the computer. The device will be able to transmit and receive
data from the computer.
HSD2 USB Channel
If the SEL pin = Logic “1” and the OE/ALM pin = Logic “1”,
high-speed Channel 2 will be ON. The HSD2- and HSD2+ switches
are ON and the HSD1- and HSD1+ switches are OFF (high
impedance).
When a USB cable from a computer or USB hub is connected at
the common USB connector and Channel 2 is active, a link will be
established between the USB 2 driver section of the media player
and the computer. The device will be able to transmit and receive
data from the computer.
All Switches OFF Mode
If the SEL pin = Logic “0” or Logic “1” and the OE/ALM
pin = Logic “0”, all of the switches will turn OFF (high impedance).
The all OFF state can be used to switch between the two USB
sections of the media player. When disconnecting from one USB
device to the other USB device, you can momentarily put the
ISL54224 switch in the “all off” state in order to get the computer
to disconnect from the one device so it can properly connect to the
other USB device when that channel is turned ON.
Whenever the ISL54224 senses a fault condition on the COM
pins, the OE/ALM pin will be internal pulled low by the device and
all switches will be turned OFF.
USB 2.0 VBUS Short Requirements
The USB specification in section 7.1.1 states a USB device must
be able to withstand a VBUS short (4.4V to 5.25V) or a -1V short to
the D+ or D- signal lines when the device is either powered off or
powered on for at least 24 hours.
The ISL54224 part has special power-off protection and OVP
detection circuitry to meet these short circuit requirements. This
circuitry allows the ISL54224 to provide protection to the USB
down-stream transceivers connected at its signal pins (HS1D-,
HS1D+, HS2D-, HS2D+) to meet the USB specification short
circuit requirements.
The power-off protection and OVP circuitry allows the COM pins
(D-, D+) to be driven up to 5.25V or down to -5V while the VDD
supply voltage is in the range of 0V to 5.25V. In these overvoltage
conditions with a 500 external VDD resistor the part draws
<55A of current into the COM pins and causes no
stress/damage to the IC. In addition, all switches are OFF and the
shorted VBUS voltage will be isolated from getting through to the
other side of the switch channels, thereby protecting the USB
transceivers.
TABLE 2. LOGIC CONTROL VOLTAGE LEVELS
VDD SUPPLY
RANGE
LOGIC = “0” (LOW)
LOGIC = “1” (HIGH)
OE/ALM
SEL
OE/ALM
SEL
2.7V to 3.6V
≤0.5V
or floating
≤0.5V
or floating
≥1.4V
3.7V to 4.2V
≤0.7V
or floating
≤0.7V
or floating
≥1.7V
4.3V to 5.25V
≤0.8V
or floating
≤0.8V
or floating
≥2.0V
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