MAX4854 MAXIM [Maxim Integrated Products], MAX4854 Datasheet - Page 6

• Manufacturer Part Number: MAX4854
• Description: 7? Quad SPST Switches with Over-Rail Signal Handling
• Manufacturer: MAXIM [Maxim Integrated Products]

The MAX4854 low on-resistance, low-voltage, analog
switch is designed to operate from a +2V to +5.5V sin-
gle supply and is fully specified for nominal +3.0V
applications. The device features over-rail signal capa-
bility that allows signals up to +5.5V with supply volt-
ages down to +2.0V to pass through without distortion.
This quad SPST switch has low on-channel capacitance,
which allows switching of the data signals for USB
2.0/1.1 applications (12Mbps). It is designed to switch
D+ and D- USB signals with a guaranteed skew of less
than 1ns (see Figure 2) as measured from 50% of the
input signal to 50% of the output signal.
The logic inputs (IN_) accept up to +5.5V even if the
supply voltages are below this level. For example, with a
+3.3V V
high to +5.5V, allowing for mixing of logic levels in a sys-
tem. Driving IN_ rail-to-rail minimizes power consump-
tion. For a +2V supply voltage, the logic thresholds are
+0.5V (low) and +1.4V (high); for a +5V supply voltage,
the logic thresholds are +0.8V (low) and +1.8V (high).
7 Ω Quad SPST Switches
with Over-Rail Signal Handling
6
_______________________________________________________________________________________
CC
supply, IN_ can be driven low to GND and
Applications Information
Detailed Description
DATA SOURCE
DATA SOURCE
Digital Control Inputs
1 (USB)
2 (USB)
D+
D-
D+
D-
NO1
NO2
NO3
NO4
MAX4854
7Ω
7Ω
7Ω
7Ω
The on-resistance of these switches changes very little
for analog input signals across the entire supply volt-
age range (see the Typical Operating Characteristics).
The switches are bidirectional; therefore, NO_ and
COM_ can be either inputs or outputs.
Caution: Do not exceed the absolute maximum rat-
ings because stresses beyond the listed ratings
may cause permanent damage to the device.
Proper power-supply sequencing is recommended for
all CMOS devices. Always apply V
analog signals, especially if the analog signal is not
current limited.
COM1
IN1
COM2
IN2
COM3
IN3
COM4
IN4
CONNECTOR
DATA 1 ENABLE
DATA 2 ENABLE
D+
D-
USB
Typical Operating Circuit
Power-Supply Sequencing
Analog Signal Levels
CC
before applying