isl54214 Intersil Corporation, isl54214 Datasheet - Page 11

• Manufacturer Part Number: isl54214
• Description: Usb 2.0 High-speed X 2channels/stereo Audio Dual Sp3t Dual 3 To 1 Multiplexer
• Manufacturer: Intersil Corporation

by taking the C1 pin “High” and the C0 pin “Low” putting the
ISL54214 part into the USB2 mode. In USB2 mode the
computer or USB hub transceiver and the MP3 player or
cellphone USB transceiver #2 are connected and digital data
will be able to be transmit back and forth.
Audio MUTE Mode
If the C1 pin = Logic “1” and C0 pin = Logic “0” the part will
be in the audio MUTE mode provided that the last state was
the Audio state. In the audio MUTE mode the 2D- and 2D+
USB switches, the L and R audio switches and the 1D- and
1D+ USB switches will be OFF (high impedance).
The 1kΩ COM shunt resistors will be connected (ON). The
1kΩ shunts provide 77dB of off-isolation when driving 10kΩ
to 20kΩ amplifier inputs.
The 1kΩ COM shunt resistors are active (ON) only when in
the Audio Mute mode.
Logic Control Timing Between C1 and C0
The ISL54214 has a unique logic control architecture. The
part has five different logic states but only two external logic
control pins, C1 and C0. Refer to the “State Diagram” on
page 2 and “Truth Table” on page 3.
The following state transitions require both C1 and C0 logic
control bits to change their logic levels in unison:
Typical Performance Curves
FIGURE 8. AUDIO ON-RESISTANCE vs SUPPLY VOLTAGE vs
2.95
2.90
2.85
2.80
2.75
2.70
2.65
2.60
2.55
2.50
2.45
-1.5
I
COM
SWITCH VOLTAGE
= 60mA
-1.0
-0.5
V
V
11
V
DD
DD
V
DD
COM
= 2.7V
= 3.6V
0
= 4.6V
(V)
0.5
T
A
= +25°C, Unless Otherwise Specified.
1.0
1.5
ISL54214
All OFF(C1 = 0, C0 = 0) -----> Audio (C1 = 1, C0 =1)
Audio (C1 = 1, C0 = 1) -----> All OFF (C1 = 0, C0 = 0)
Audio Mute (C1 = 1, C0 = 0) -----> USB1 (C1 = 0, C0 = 1)
The delay time between these bits must be < 100ns to
ensure that you directly move between these states without
momentarily transitioning to one of the other states.
For example, if you are going from the “All OFF” state to the
“Audio” state and C0 does not go high until 100nS after C1
went high you will momentarily transition to the “USB2” state.
Any signals connected at the USB2 signal lines will
momentarily get passed through to the COM outputs.
Delay time between C1 and C0 must be < 100ns and should
be controlled by logic control drivers with well behaved
monotonic transitions from High to Low and Low to High and
with typical logic family rise and fall times of 1ns to 6ns.
POWER
The power supply connected at VDD (pin 11) provides power
to the ISL54214 part. Its voltage should be kept in the range
of 2.7V to 4.6V. In a typical application V
range of 2.7V to 4.3V and will be connected to the battery or
LDO of the MP3 player or cellphone.
A 0.01µF or 0.1µF decoupling capacitor should be
connected from the VDD pin to ground to filter out any power
supply noise from entering the part. The capacitor should be
located as close to the VDD pin as possible.
FIGURE 9. AUDIO ON-RESISTANCE vs SUPPLY VOLTAGE vs
2.60
2.58
2.56
2.54
2.52
2.50
2.48
-1.5
I
COM
SWITCH VOLTAGE
= 60mA
-1.0
-0.5
V
V
V
V
V
V
DD
DD
DD
DD
DD
COM
= 4.6V
= 3.0V
= 3.3V
= 3.6V
0
= 4.0V
(V)
DD
0.5
will be in the
December 11, 2008
1.0
FN6816.0
1.5