Maxim MAX4586 Serially controlled, 4-channel serially controlled, 4-channel Datasheet

19-1511; Rev 0; 8/99
Serially Controlled, 4-Channel
Audio/Video Multiplexers
Features
♦ +2.7V to +5.5V Single-Supply Operation
♦ 4-to-1 Channel Multiplexer
♦ 65Ω (max) RON with +5V Supply
♦ Audio Performance
-83dB Off-Isolation at 20kHz
-84dB Crosstalk at 20kHz
♦ Video Performance
-48dB Off-Isolation at 10MHz
-60dB Crosstalk at 10MHz
♦ Serial Interface
2-Wire, I2C Compatible (MAX4586)
3-Wire, SPI/QSPI/MICROWIRE Compatible
(MAX4587)
Ordering Information
Applications
Cellular Phones and Accessories
PART
TEMP. RANGE
PIN-PACKAGE
Private Mobile Radios (PMRs)
MAX4586EUB
-40°C to +85°C
10 µMAX
PC Multimedia Audio/Video Routing
MAX4587EUB
-40°C to +85°C
10 µMAX
Industrial Equipment
Set-Top Boxes
Video Conferencing
High-End Audio Equipment
Pin Configuration/
Functional Diagram
TOP VIEW
MAX4586
MAX4587
COM 1
I2C is a trademark of Philips Corp.
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
10 NO4
A (CS) 2
9
NO3
SDA (DIN) 3
8
GND
V+ 4
7
NO2
SCL(SCLK) 5
6
NO1
µMAX
( ) ARE FOR MAX4587 ONLY.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX4586/MAX4587
General Description
The MAX4586/MAX4587 serial-interface, programmable,
4-to-1 channel multiplexers are ideal for multimedia
applications. They feature 65Ω on-resistance, 4Ω onresistance matching between channels, and 5Ω onresistance flatness. Additionally, they feature -83dB
off-isolation at 20kHz and -48dB off-isolation at 10MHz,
with -84dB crosstalk at 20kHz and -60dB crosstalk at
10MHz.
The MAX4586 uses a 2-wire, I2C™-compatible serial
interface; the MAX4587 uses a 3-wire, SPI™/QSPI™/
MICROWIRE™-compatible interface. Both devices are
available in 10-pin µMAX packages and are specified
for the extended -40°C to +85°C temperature range.
MAX4586/MAX4587
Serially Controlled, 4-Channel
Audio/Video Multiplexers
ABSOLUTE MAXIMUM RATINGS
V+ to GND ................................................................-0.3V to +6V
COM and NO_ to GND (Note 1)...................-0.3V to (V+ + 0.3V)
A, CS, SDA, DIN, SCL, and SCLK to GND...............-0.3V to +6V
Continuous Current into Any Terminal..............................±20mA
Peak Current into Any Terminal
(pulsed at 1ms, 10% duty cycle).................................±40mA
ESD per Method 3015.7.......................................................>2kV
Continuous Power Dissipation (TA = +70°C)
10-Pin µMAX (derate 4.1mW/°C above +70°C) ..........330mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
Note 1: Signals on NO_ or COM exceeding V+ or ground are clamped by internal diodes. Limit forward-diode current to maximum
current rating.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS—Single +5V Supply
(V+ = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V+
V
ANALOG SWITCHES
Analog Signal Range (Note 3)
VNO_,
VCOM
On-Resistance
RON
On-Resistance Match
Between Channels
(Note 4)
∆RON
On-Resistance Flatness
(Note 5)
RFLAT
0
V+ = 4.75V,
VNO_ = 3V,
ICOM = 4mA
TA = +25°C
V+ = 4.75V,
VNO_ = 3V,
ICOM = 4mA
TA = +25°C
V+ = 4.75V;
VNO_ = 1V, 2V, 3V;
ICOM = 4mA
TA = +25°C
45
TA = TMIN to TMAX
Ω
80
2
TA = TMIN to TMAX
4
Ω
5
2
TA = TMIN to TMAX
5
Ω
6.5
NO_ Off-Leakage Current
(Note 6)
V+ = 5.25V;
VNO_ = 1V, 4.5V;
VCOM = 4.5V, 1V
TA = +25°C
-1
INO_(OFF)
TA = TMIN to TMAX
-10
COM Off-Leakage Current
(Note 6)
V+ = 5.25V;
ICOM(OFF) VNO_ = 1V, 4.5V;
VCOM = 4.5V, 1V
TA = +25°C
-1
TA = TMIN to TMAX
-10
COM On-Leakage Current
(Note 6)
TA = +25°C
-1
ICOM(ON)
TA = TMIN to TMAX
-10
V+ = 5.25V; VNO_ =
1V, 4.5V, or floating;
VCOM = 1V, 4.5V
65
0.001
1
nA
10
0.001
1
nA
10
0.002
1
nA
10
AUDIO PERFORMANCE
Off-Isolation (Note 7)
VISO(A)
VA = 1.0VRMS, fIN = 20kHz, RL = 600Ω,
Figure 8
-83
dB
Channel-to-Channel Crosstalk
VCT(A)
VA = 1.0VRMS, fIN = 20kHz, RS = 600Ω,
Figure 8
-84
dB
2
_______________________________________________________________________________________
Serially Controlled, 4-Channel
Audio/Video Multiplexers
(V+ = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
VIDEO PERFORMANCE
Off-Isolation (Note 7)
VISO(V)
VA = 1.0VRMS, fIN = 10MHz, RL = 50Ω,
Figure 8
-48
dB
Channel-to-Channel Crosstalk
VCT(V)
VA = 1.0VRMS, fIN = 10MHz, RS = 50Ω,
Figure 8
-60
dB
-0.1dB Bandwidth
BW
RS = 75Ω, RL = 1kΩ
5
MHz
-3dB Bandwidth
BW
RS = 50Ω, RL = 50Ω
300
MHz
5
pF
NO_ Off-Capacitance
COFF
fIN = 1MHz
DYNAMIC TIMING (Notes 8, 9, and Figure 5)
Turn-On Time
tON
Turn-Off Time
tOFF
Break-Before-Make Time
tBBM
Charge Injection
Q
VNO_ = 2.5V,
RL = 5kΩ, CL = 35pF
TA = +25°C
275
TA = TMIN to TMAX
TA = +25°C
VNO_ = 2.5V,
RL = 300Ω, CL = 35pF TA = TMIN to TMAX
VNO_ = 2.5V, Figure 6
400
500
125
200
250
10
CL = 1.0nF, VS = 0, RS = 0, Figure 7
ns
ns
50
ns
3
pC
POWER SUPPLY
Power-Supply Voltage Range
V+
Supply Current
I+
2.7
All logic inputs = 0 or V+
5
5.5
V
10
µA
_______________________________________________________________________________________
3
MAX4586/MAX4587
ELECTRICAL CHARACTERISTICS—Single +5V Supply (continued)
MAX4586/MAX4587
Serially Controlled, 4-Channel
Audio/Video Multiplexers
ELECTRICAL CHARACTERISTICS—Single +3V Supply
(V+ = +3V ±10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V+
V
ANALOG SWITCHES
Analog Signal Range (Note 3)
On-Resistance
VNO_,
VCOM
RON
On-Resistance Match
Between Channels
(Note 4)
∆RON
On-Resistance Flatness
(Note 5)
RFLAT
NO_ Off-Leakage Current
(Notes 6, 10)
INO_(OFF)
COM Off-Leakage Current
(Notes 6, 10)
ICOM(OFF)
COM On-Leakage Current
(Notes 6, 10)
ICOM(ON)
0
V+ = 2.7V,
VNO_ = 1V,
ICOM = 4mA
V+ = 2.7V,
VNO_ = 1V,
ICOM = 4mA
TA = +25°C
65
TA = TMIN to TMAX
110
Ω
130
TA = +25°C
3
TA = TMIN to TMAX
5
Ω
6
V+ = 2.7V;
TA = +25°C
VNO_ = 1V, 1.5V, 2V;
TA = TMIN to TMAX
ICOM = 4mA
3
10
Ω
12
V+ = 3.6V;
VNO_ = 0.5V, 3V;
VCOM = 3V, 0.5V
TA = +25°C
-1
TA = TMIN to TMAX
-10
V+ = 3.6V;
VNO_ = 0.5V, 3V;
VCOM = 3V, 0.5V
TA = +25°C
-1
TA = TMIN to TMAX
-10
V+ = 3.6V; VNO_ =
0.5V, 3V, or floating;
VCOM = 0.5V, 3V
TA = +25°C
-1
TA = TMIN to TMAX
-10
0.001
1
nA
10
0.001
1
nA
10
0.002
1
nA
10
AUDIO PERFORMANCE
Off-Isolation (Note 7)
VISO(A)
VA = 0.5VRMS, fIN = 20kHz, RL = 600Ω,
Figure 8
-83
dB
Channel-to-Channel Crosstalk
VCT(A)
VA = 0.5VRMS, fIN = 20kHz, RS = 600Ω,
Figure 8
-84
dB
Off-Isolation (Note 7)
VISO(V)
VA = 0.5VRMS, fIN = 10MHz, RL = 50Ω,
Figure 8
-48
dB
Channel-to-Channel Crosstalk
VCT(V)
VA = 0.5VRMS, fIN = 10MHz, RS = 50Ω,
Figure 8
-60
dB
RS = 50Ω, RL = 50Ω
200
MHz
5
pF
VIDEO PERFORMANCE
-3dB Bandwidth
NO_ Off-Capacitance
BW
COFF
fIN = 1MHz
DYNAMIC TIMING (Notes 8, 9, and Figure 5)
Turn-On Time
tON
Turn-Off Time
tOFF
Break-Before-Make Time
tBBM
4
VNO_ = 1.5V,
RL = 5kΩ, CL = 35pF
TA = +25°C
400
TA = TMIN to TMAX
TA = +25°C
VNO_ = 1.5V,
RL = 300Ω, CL = 35pF TA = TMIN to TMAX
VNO_ = 1.5V, Figure 6
800
1000
200
350
500
10
100
_______________________________________________________________________________________
ns
ns
ns
Serially Controlled, 4-Channel
Audio/Video Multiplexers
MAX4586/MAX4587
I/O INTERFACE CHARACTERISTICS
(V+ = +2.7V to +5.25V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
DIGITAL INPUTS (SCLK, DIN, CS, SCL, SDA, A)
V+ = 5V
Input Low Voltage
VIL
V+ = 3V
Input High Voltage
VIH
Input Hysteresis
VHYST
Input Leakage Current
ILEAK
Input Capacitance
MAX
0.8
0.6
V+ = 5V
3
V+ = 3V
2
Digital inputs = 0 or V+
-1
f = 1MHz
VOL
ISINK = 6mA
V
V
0.2
CIN
UNITS
0.01
V
1
5
µA
pF
DIGITAL OUTPUT (SDA)
Output Low Voltage
0.4
V
2-WIRE TIMING CHARACTERISTICS
(Figures 1 and 2, V+ = +2.7V to +5.25V, fSCL = 100kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
SCL Clock Frequency
fSCL
Bus Free Time Between Stop
and Start Condition
tBUF
CONDITIONS
V+ = 2.7V to 5.25V
MIN
0
V+ = 4.75V to 5.25V
The first clock is generated after this period.
TYP
MAX
100
400
UNITS
kHz
4.7
µs
4.0
µs
4.0
µs
Hold Time After Start Condition
tHD:STA
Stop Condition Setup Time
tSU:STO
Data Hold Time
tHD:DAT
0
µs
Data Setup Time
tSU:DAT
250
ns
Clock Low Period
tLOW
4.7
µs
Clock High Period
tHIGH
4.0
µs
SCL/SDA Rise Time (Note 11)
tR
20 +
0.1CB
300
ns
SCL/SDA Fall Time (Note 11)
tF
20 +
0.1CB
300
ns
_______________________________________________________________________________________
5
3-WIRE TIMING CHARACTERISTICS
(Figures 3 and 4, V+ = +2.7V to +5.25V, fOP = 2.1MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
Operating Frequency
CONDITIONS
MIN
V+ = 2.7V to 5.25V
V+ = 4.75V to 5.25V
fOP
TYP
MAX
UNITS
2.1
10
MHz
0
DIN to SCLK Setup
tDS
100
ns
DIN to SCLK Hold
tDH
0
ns
CS Fall to SCLK Rise Setup
tCSS
100
ns
CS Rise to SCLK Hold
tCSH
0
ns
SCLK Pulse Width Low
tCL
200
ns
SCLK Pulse Width High
tCH
200
ns
Rise Time (SCLK, DIN, CS)
tR
2
µs
Fall Time (SCLK, DIN, CS)
tF
2
µs
CS Pulse Width High
tCSW
ns
40
Algebraic convention is used in this data sheet; the most negative value is shown in the minimum column.
Guaranteed by design. Not subject to production testing.
∆RON = RON(MAX) - RON(MIN).
Resistance flatness is defined as the difference between the maximum and minimum on-resistance values, as measured
over the specified analog signal range.
Note 6: Leakage parameters are 100% tested at maximum rated temperature and guaranteed by correlation at TA = +25°C.
Note 7: Off-isolation = 20log (VCOM / VNO_ ), VCOM = output, VNO_ = input to off switch.
Note 8: All timing is measured from the clock’s falling edge preceding the ACK signal for 2-wire and from the rising edge of CS for
3-wire. Turn-off time is defined at the output of the switch for a 0.5V change, tested with a 300Ω load to ground. Turn-on
time is defined at the output of the switch for a 0.5V change and measured with a 5kΩ load resistor to GND. All timing is
shown with respect to 20% V+ and 70% V+, unless otherwise noted.
Note 9: Typical values are for MAX4586 devices.
Note 10: Leakage testing is guaranteed by testing with a +5.25V supply.
Note 11: CB = capacitance of one bus line in pF. Tested with CB = 400pF.
Note 2:
Note 3:
Note 4:
Note 5:
Typical Operating Characteristics
(V+ = +5V, TA = +25°C, unless otherwise noted.)
V+ = 5.0V
50
TA = +25°C
40
45
35
TA = -40°C
V+ = 5.5V
TA = -55°C
30
TA = +25°C
55
50
VCOM (V)
TA = -40°C
40
TA = -55°C
35
30
30
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
6
65
45
40
35
45
TA = +125°C
TA = +85°C
70
60
V+ = 4.0V
RON (Ω)
55
50
V+ = 3.0V
75
RON (Ω)
65
TA = +125°C
TA = +85°C
MAX4586/7-02
V+ = 2.7V
60
55
MAX4586/7-01
70
ON-RESISTANCE vs.
VCOM AND TEMPERATURE (V+ = 3.3V)
ON-RESISTANCE vs.
VCOM AND TEMPERATURE (V+ = 5V)
MAX4586/7-03
ON-RESISTANCE
vs. VCOM AND SUPPLY VOLTAGE
RON (Ω)
MAX4586/MAX4587
Serially Controlled, 4-Channel
Audio/Video Multiplexers
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VCOM (V)
0
0.5
1.5
1.0
VCOM (V)
_______________________________________________________________________________________
2.0
2.5
3.0
Serially Controlled, 4-Channel
Audio/Video Multiplexers
SUPPLY CURRENT vs. TEMPERATURE
4.5
4.4
4.3
1
500
0
-1
400
tON
300
-2
200
-3
100
tOFF
4.2
4.1
4.0
-4
-55 -35 -15
5
25
45
65
85 105 125
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
2.5
4.5
5.0
TURN-ON/TURN-OFF TIMES
vs. TEMPERATURE
ON-LEAKAGE CURRENT
vs. TEMPERATURE
OFF-LEAKAGE CURRENT
vs. TEMPERATURE
ICOM(ON) @
VCOM = 4.5V
VNO = FLOATING
ICOM(ON) @
VCOM = 1.0V
VNO = FLOATING
10
MAX4586/7-08A
ICOM(OFF) @
VCOM = 1.0V
VNO = 4.5V
1
CURRENT (nA)
200
150
CURRENT (nA)
1
tON
0.1
tOFF
0.1
0
INO(OFF) @
VNO = 1.0V
VCOM = 4.5V
0.001
0.001
5
25
45
65
85 105 125
-55 -35 -15
TEMPERATURE (°C)
AUDIO FREQUENCY RESPONSE
-20
-10
LOSS (dB)
-30
-40
-50
-60
-70
45
65
85 105 125
TURN-ON/TURN-OFF TIMES
INSERTION LOSS
CLK
5V/div
OFF-ISOLATION
tON
2V/div
-50
-60
CROSSTALK
tOFF
2V/div
-80
CROSSTALK
-90
-100
10
25
-70
OFF-ISOLATION
1
5
TEMPERATURE (°C)
-20
-40
FREQUENCY (kHz)
-55 -35 -15
85 105 125
65
VIDEO FREQUENCY RESPONSE
-30
0.1
45
0
MAX4586/7-09
600Ω IN AND OUT
-90
25
TEMPERATURE (°C)
0
-80
5
MAX4586/7-10
-55 -35 -15
INO(OFF) @
VNO = 4.5V
VCOM = 1.0V
0.01
0.01
50
ICOM(OFF) @
VCOM = 4.5V
VNO = 1.0V
5.5
MAX4586/7-11
MAX4586/7-07
10
100
LOSS (dB)
4.0
SUPPLY VOLTAGE (V)
250
0.01
3.5
VCOM (V)
300
-10
3.0
TEMPERATURE (°C)
350
TIME (ns)
0
0
MAX4586/7-08B
4.6
600
TIME (ns)
4.7
MAX4586/7-06
2
CHARGE INJECTION (pC)
4.8
700
MAX4586/7-05
4.9
SUPPLY CURRENT (µA)
3
MAX4586/7-04
5.0
TURN-ON AND TURN-OFF TIMES
vs. SUPPLY VOLTAGE
CHARGE INJECTION vs. VCOM
100
50Ω IN AND OUT
-100
0.1
1
10
100
100ns/div
FREQUENCY (MHz)
_______________________________________________________________________________________
7
MAX4586/MAX4587
Typical Operating Characteristics (continued)
(V+ = +5V, TA = +25°C, unless otherwise noted.)
Serially Controlled, 4-Channel
Audio/Video Multiplexers
MAX4586/MAX4587
Pin Description
PIN
MAX4586
MAX4587
1
1
NAME
COM
Analog Switch Common Terminal
2
—
A
—
2
CS
3
—
SDA
Data Input of 2-Wire Serial Interface
—
3
DIN
Data Input of 3-Wire Serial Interface
4
4
V+
Supply Voltage
5
—
SCL
Clock Input of the 2-Wire Serial Interface
—
5
SCLK
Clock Input of the 3-Wire Serial Interface
6
6
NO1
Mux Normally Open Output 1
7
7
NO2
Mux Normally Open Output 2
8
8
GND
Ground
9
9
NO3
Mux Normally Open Output 3
10
10
NO4
Mux Normally Open Output 4
Detailed Description
The MAX4586/MAX4587 are serial-interface, programmable multiplexers. Each device contains a 4-to-1 normally
open (NO) multiplexer. Each switch is independently controlled through the on-chip serial interface. The MAX4586
uses a 2-wire, I2C-compatible serial communications
protocol, and the MAX4587 uses a 3-wire, SPI/QSPI/
MICROWIRE-compatible serial communications protocol.
These devices operate from a single +2.7V to +5.5V
supply and are optimized for use with an audio frequency at 20kHz and video frequencies up to 10MHz.
They feature 65Ω on-resistance, 4Ω on-resistance
matching between channels, and 5Ω on-resistance flatness. Audio off-isolation is -83dB at 20kHz and
crosstalk is at least -84dB at 20kHz, while video off-isolation is -48dB at 10MHz and crosstalk is at least -60dB
at 10MHz.
Applications Information
Multiplexer Control
The MAX4586/MAX4587 have a common command-bit
structure; the only difference between them is the interface type (2-wire or 3-wire, respectively).
The command controls the open/closed states of the
various switches. Table 1 shows the configuration of
the data bits and their related switches. After a command is issued, a logic “1” in any data-bit location closes the associated switch, while a logic “0” opens it
(Table 2).
8
FUNCTION
LSB + 2 of the 2-Wire Serial-Interface Address Field
Chip Select of the 3-Wire Serial Interface
2-Wire Serial Interface
The MAX4586 uses a 2-wire, I 2 C-compatible serial
interface. The COM_ register uses the “SendByte” protocol that consists of an address byte followed by a
command byte (Table 1).
To address a given chip, the A bit in the address byte
must duplicate the value present at the A pin of that chip.
The rest of the address bits must match those shown in
Table 3. The command byte details are described in the
Switch Control section.
The 2-wire serial interface requires only two I/O lines of
a standard microprocessor (µP) port. Figures 1 and 2
detail the timing diagram for signals on the 2-wire bus,
and Tables 1 and 3 detail the format of the signals. The
MAX4586 is a receive-only device and must be controlled by the bus master device. A bus master device
communicates by transmitting the address byte of the
slave device over the bus and then transmitting the
desired information. Each transmission consists of a
start condition, an address byte, a command byte, and
finally a stop condition. The slave device acknowledges
the recognition of its address by pulling the SDA line
low for one clock period after the address byte is transmitted. The slave device also issues a similar acknowledgment after the command byte.
_______________________________________________________________________________________
Serially Controlled, 4-Channel
Audio/Video Multiplexers
Table 2. Truth Table
POWER-UP
STATE
LOGIC
0
OPEN
x
x
1
CLOSED
D6
x
x
D5
x
x
D4
x
x
D3
NO4 to COM
10, 1
0 (Open)
D2
NO3 to COM
9, 1
0 (Open)
ADDRESS BIT (A)
ADDRESS
D1
NO2 to COM
7, 1
0 (Open)
0
0110 1010
D0 (LSB)
NO1 to COM
6, 1
0 (Open)
1
0110 1110
COMMAND
BIT
SWITCH
D7 (MSB)
TERMINALS
MAX4586/MAX4587
Table 1. Command-Bit Mapping
NO_ SWITCH
Table 3. Address Bit Map
X = Don’t care
70%
SDA
70%
20%
20%
70%
20%
tSU, DAT
70%
20%
70%
20%
tBUF
tSU, STA
tHD, STA
tLOW
70%
20%
SCL
tSU, STO
tHD, DAT
70%
20%
tHIGH
tHD, STA
tR
70%
20%
70%
70%
70%
tF
START CONDITION
REPEATED START CONDITION
STOP CONDITION
START CONDITION
Figure 1. 2-Wire Serial-Interface Timing Diagram
COMMAND BYTE
SLAVE ADDRESS BYTE
SDA
MSB
LSB
ACK
MSB
LSB
ACK
SCL
START CONDITION
STOP CONDITION
Figure 2. Complete 2-Wire Serial-Interface Transmission
Start and Stop Conditions
The bus master signals the beginning of a transmission
with a start condition by transitioning SDA from high to
low while SCL is high. When the bus master has finished communicating with the slave device, it issues a
stop condition by transitioning SDA from low to high
while SCL is high. The bus master is then free for
another transmission.
Slave Address (Address Byte)
The MAX4586 uses an 8-bit-long slave address. To
select a slave address, connect A to V+ or GND. The
MAX4586 has two possible slave addresses, so a maximum of two of these devices may share the same
address line. The slave device MAX4586 monitors the
serial bus continuously, waiting for a start condition followed by an address byte. When a slave device recog-
_______________________________________________________________________________________
9
MAX4586/MAX4587
Serially Controlled, 4-Channel
Audio/Video Multiplexers
20%
CS
20%
70%
tCSW
tCSH
SCLK
20%
tDH
20%
tCSO
tCH
tCL
tCSS
20% 20%
70%
70%
70%
20%
tDS
D6
D7
DIN
D1
D0
Figure 3. 3-Wire Serial-Interface Timing Diagram
of the command byte are “don’t care.” While shifting
data, the device remains in its original configuration.
After all eight bits are clocked into the input shift register, a rising edge on CS latches the data into the
MAX4587 internal registers, initiating the device’s
change of state. Figures 3 and 4 detail the 3-wire protocol, and Table 1 details the command byte format.
SWITCHES UPDATED
CS
SCLK
DATA CLOCKED IN
Addressable Serial Interface
DIN
D7
D6 D5 D4 D3 D2 D1 D0
LSB
MSB
INPUT DATA BITS
Figure 4. Complete 3-Wire Serial Transmission
nizes its address (01101A10), it acknowledges that it is
ready for further communication by pulling the SDA line
low for one clock period.
3-Wire Serial Interface
The MAX4587 3-wire serial interface is SPI/QSPI/
MICROWIRE compatible. An active-low chip-select
(CS) input enables the device to receive data for the
serial input (DIN). Data is clocked in on the rising edge
of the serial-clock (SCLK) signal. A total of 8 bits is
needed in each write cycle. The first bit clocked into
the MAX4587 is the command byte’s MSB, and the last
bit clocked in is the data byte’s LSB. The first four bits
10
To program several MAX4587s individually using a single processor, connect DIN of each MAX4587 together
and control CS on each MAX4587 separately. To select
a particular device, drive the corresponding CS low,
clock in the 8-bit command, then drive CS high to execute the command. Typically, only one MAX4587 is
addressed at a time.
Power-Up State
The MAX4586/MAX4587 feature a preset power-up
state. See Table 1 to determine the power-up state of
the devices.
___________________Chip Information
TRANSISTOR COUNT: 2259
______________________________________________________________________________________
Serially Controlled, 4-Channel
Audio/Video Multiplexers
ACKNOWLEDGE
BIT
3V
tR < 20ns
tF < 20ns
50%
SCL
0
MAX4586
MAX4587
V+
VOUT
10nF
2-WIRE
V+
NO_
VNO_
2 OR 3
tON
VOUT
COM
VOUT
VOUT - 0.5V
0
tOFF
CL
35pF
RL
3V
DECODER/
CONTROLLER
µP
0.5V
0
CS
50%
0
SERIAL
INTERFACE
VOUT
GND
3-WIRE
0.5V
0
tON
VOUT
VOUT - 0.5V
0
CL INCLUDES FIXTURE AND STRAY CAPACITANCE.
VOUT = VNO_ [RL / (RL + RON)]
tOFF
Figure 5. Switching Time
ACKNOWLEDGE BIT
3V
tR < 20ns
tF < 20ns
50%
SCL
0V
VOUT
MAX4586
MAX4587
V+
80%
10nF
2-WIRE
V+
NO_
COM
VIN
2 OR 3
tBBM
CS
NO_
µP
0
VOUT
RL
CL
3V
DECODER/
CONTROLLER
SERIAL
INTERFACE
50%
0
VOUT
80%
GND
3-WIRE
0
CL INCLUDES FIXTURE AND STRAY CAPACITANCE.
VOUT = VCOM_ [RL / (RL + RON)]
tBBM
Figure 6. Break-Before-Make Interval
______________________________________________________________________________________
11
MAX4586/MAX4587
Test Circuits/Timing Diagrams
MAX4586/MAX4587
Serially Controlled, 4-Channel
Audio/Video Multiplexers
Test Circuits/Timing Diagrams (continued)
V+
MAX4586
MAX4587
ACKNOWLEDGE
BIT
10nF
ACKNOWLEDGE
BIT
3V
SCL
0
V+
NO_
COM
VOUT
2-WIRE
VOUT
CL
1000pF
2 OR 3
µP
DECODER/
CONTROLLER
∆VOUT
3V
CS
SERIAL
INTERFACE
3-WIRE
GND
DIN
0
3V
8-BIT COMMAND
0
0
∆VOUT IS THE MEASURED VOLTAGE DUE TO CHARGE-TRANSFER
ERROR Q WHEN THE CHANNEL TURNS OFF.
Q = ∆VOUT • CL
∆VOUT
VOUT
Figure 7. Charge Injection
MAX4586
MAX4587
V+
10nF
10nF
V+
V+
COM V+
ANALYZER
2/3
RL
SIGNAL
GENERATOR 0dBm
NO1
ANALYZER
DECODER/
CONTROLLER
RL
SIGNAL
GENERATOR 0dBm
NO_
GND
50Ω
NO_
GND
a) OFF-ISOLATION
2/3
DECODER/
CONTROLLER
COM
b) CROSSTALK
Figure 8. Off-Isolation and Crosstalk
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
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© 1999 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.