ISL54227 Intersil, ISL54227 Datasheet - Page 11

• Manufacturer Part Number: ISL54227
• Description: High-Speed USB 2.0 (480Mbps) DPST Switch
• Manufacturer: Intersil

The OE and LP pins are internally pulled low through a
4MΩ resistor to ground and can be tri-stated or left
floating.
The ISL54227 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
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
Typical Performance Curves
V
FIGURE 9. ON-RESISTANCE vs SUPPLY VOLTAGE vs
DD
4.3V to 5.25V
2.7V to 3.6V
3.7V to 4.2V
DD
RANGE
supply rail minimizes power consumption.
DD
3.4
3.3
3.2
3.1
3.0
2.9
TABLE 2. LOGIC CONTROL VOLTAGE LEVELS
SUPPLY
DD
0
supply voltage. With V
I
= 4.3V and the OE logic pin is at 2.6V the part
COM
DD
SWITCH VOLTAGE
supply voltage. It can be driven up to
= 17mA
DD
LOGIC = “0” (LOW)
floating
floating
floating
≤ 0.5V
≤ 0.7V
≤ 0.8V
supply in the range of 2.7V to 5.25V.
0.1
OE
or
or
or
11
V
floating
floating
floating
≤ 0.8V
≤ 0.5V
≤ 0.7V
COM
0.2
LP
or
or
or
DD
(V)
5.25V
3.0V
= 3.6V and the OE
2.7V
3.3V
3.6V
4.3V
≥1.4V
≥1.7V
≥2.0V
DD
OE
LOGIC = “1”
0.3
(HIGH)
current
≥1.4V
≥1.7V
≥2.0V
LP
T
ISL54227
0.4
A
= +25°C, Unless Otherwise Specified
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 ISL54227 part has special power-off protection and
OVP detection circuitry to meet these short circuit
requirements. This circuitry allows the ISL54227 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 with a
500Ω external V
current into the COM pins and causes no stress/damage
to the IC. In addition all switches are OFF and the
shorted V
through to the other side of the switch channels, thereby
protecting the USB transceiver.
FIGURE 10. ON-RESISTANCE vs SUPPLY VOLTAGE vs
16
14
12
10
8
6
4
2
0
0
BUS
I
COM
SWITCH VOLTAGE
BUS
voltage will be isolated from getting
= 17mA
0.6
DD
Short Requirments
resistor the part draws <55µA of
1.2
DD
supply voltage is in the range
V
COM
1.8
5.25V
(V)
3.0V
2.4
BUS
www.DataSheet4U.com
short (4.4V to
2.7V
3.3V
3.0
July 2, 2010
FN7593.0
3.6