ISL54228IRTZ-T7A Intersil, ISL54228IRTZ-T7A Datasheet - Page 11

• Manufacturer Part Number: ISL54228IRTZ-T7A
• Description: IC USB SWITCH DPST OVP 8TDFN
• Manufacturer: Intersil

Specifications of ISL54228IRTZ-T7A

• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

In a typical application, V
2.8V to 4.3V and will be connected to the battery or
LDO of the portable media device.
LOGIC CONTROL
The state of the ISL54228 device is determined by the
voltage at the OE pin, LP pin, and the signal voltage at
the COM pins. Refer to “Truth Table” on page 2.
The OE and LP pins are internally pulled low through a
4M
floating.
The ISL54228 is designed to minimize I
consumption when the logic control voltage is lower than
the V
logic pin is at 1.4V, the part typically draws only 25µA.
With V
typically draws only 35µA. Driving the logic pin to the
V
The OE and LP pin can be driven with a voltage higher
than the V
5.25V with a V
V
DD
4.3V to 5.25V
2.7V to 3.6V
3.7V to 4.2V
DD
Ω
RANGE
resistor to ground and can be tri-stated or left
supply rail minimizes power consumption.
DD
TABLE 2. LOGIC CONTROL VOLTAGE LEVELS
SUPPLY
DD
supply voltage. With V
= 4.3V and the OE logic pin is at 2.6V, the part
DD
supply voltage. It can be driven up to
DD
LOGIC = “0” (LOW)
floating
floating
floating
≤ 0.5V
≤ 0.7V
≤ 0.8V
supply in the range of 2.7V to 5.25V.
OE
or
or
or
11
DD
floating
floating
floating
≤ 0.8V
≤ 0.5V
≤ 0.7V
LP
will be in the range of
or
or
or
DD
= 3.6V and the OE
≥1.4V
≥1.7V
≥2.0V
DD
OE
LOGIC = “1”
(HIGH)
current
≥1.4V
≥1.7V
≥2.0V
LP
ISL54228
ISL54228
Low Power Mode
If the OE pin = Logic “0”, and the LP pin = Logic “1” the
switches will turn OFF (high impedance) and the part
will be put in a low power mode. In this mode, the part
draws only 10µA (max) of current across the operating
temperature range.
Normal Operation Mode
With a signal level in the range of 0V to 3.6V and with
the LP pin = Logic “0” the switches will be ON when the
OE pin = Logic “1” and will be OFF (high impedance)
when the OE pin = Logic “0”.
USB 2.0 V
The USB specification in section 7.1.1 states a USB
device must be able to withstand a V
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 ISL54228 part has special power-off protection and
OVP detection circuitry to meet these short circuit
requirements. This circuitry allows the ISL54228 to
provide protection to the USB down-stream transceiver
connected at its signal pins (D-, D+) to meet the USB
specification short circuit requirements.
The power-off protection and OVP circuitry allows the
COM pins (COM-, COM+) to be driven up to 5.25V or
down to -5V while the V
of 0V to 5.25V. In these overvoltage conditions, the part
draws < 55µA of current into the COM pins and causes
no stress/damage to the IC. In addition, all switches are
OFF and the shorted V
getting through to the other side of the switch channels,
thereby protecting the USB transceiver.
BUS
Short Requirements
BUS
DD
voltage will be isolated from
supply voltage is in the range
BUS
short (4.4V to
July 29, 2010
FN7628.0