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MAX4585EUB
Datasheet
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Maxim MAX4585EUB Datasheet

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General Description
The MAX4584/MAX4585 serial-interface, programmable switches are ideal for multimedia applications. Each device contains one normally open (NO) single-pole/ single-throw (SPST) switch and one single-pole/double­throw (SPDT) switch. The MAX4584/MAX4585 feature 65Ω on-resistance, 4Ω on-resistance matching between channels, and 5Ω on-resistance flatness. Additionally, they have off-isolation of -83dB at 20kHz and -48dB at 10MHz, with crosstalk of -84dB at 20kHz and -60dB at 10MHz.
The MAX4584 uses a 2-wire I2C™-compatible serial interface; the MAX4585 uses a 3-wire SPI™/QSPI™/ MICROWIRE™-compatible interface. Both devices are available in a 10-pin µMAX package and are specified for the extended-industrial (-40°C to +85°C) temperature range.
Applications
Cellular Phones and Accessories Private Mobile Radios (PMRs) PC Multimedia Audio/Video Routing Industrial Equipment Set-Top Boxes Video Conferencing High-End Audio Equipment
Features
♦ +2.7V to +5.5V Single-Supply Operation ♦ SPST and SPDT Switches ♦ 65Ω (max) R
ON
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 I
2
C Compatible (MAX4584) 3-Wire SPI/QSPI/MICROWIRE Compatible (MAX4585)
MAX4584/MAX4585
Serially Controlled
Audio/Video Switches
________________________________________________________________
Maxim Integrated Products
1
19-1521; Rev 0; 8/99
PART MAX4584EUB MAX4585EUB
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE PIN-PACKAGE
10 µMAX 10 µMAX
Ordering Information
I2C is a trademark of Philips Corp. SPI/QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
Pin Configuration/
Functional Diagram
TOP VIEW
MAX4584 MAX4585
COM1
A (CS)
SDA (DIN)
V+
SCL (SCLK)
( ) ARE FOR MAX4585 ONLY.
1
2
3
4
5
µMAX
10
NO1A
9
NO1B
GND
8
7
COM2
NO2
6
MAX4584/MAX4585
Serially Controlled Audio/Video Switches
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS—Single +5V Supply
(V+ = +5V ±5%, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)
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.
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)
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.
AUDIO PERFORMANCE
-10 10TA= T
MIN
to T
MAX
VA= 1V
RMS
, fIN= 20kHz,
RS= 600Ω, Figure 8
dB
TA= +25°C
VA= 1V
RMS
, fIN= 20kHz,
RL= 600Ω, Figure 8
TA= T
MIN
to T
MAX
TA= +25°C
CONDITIONS
-84V
CT(A)
Channel-to-Channel Crosstalk
24
V0V+
VNO_ _,
V
COM_
Analog Signal Range (Note 3)
dB-83V
ISO(A)
Off-Isolation (Note 7)
5
TA= +25°C
TA= T
MIN
to T
MAX
TA= +25°C
TA= T
MIN
to T
MAX
-1 0.001 1
45 65
80
-10 10
TA= T
MIN
to T
MAX
UNITSMIN TYP MAXSYMBOLPARAMETER
25
6.5
TA= +25°C
V+ = 5.25V; VNO_ _ = 1V, 4.5V, or floating; V
COM_
= 1V, 4.5V
TA= +25°C
nA
-1 0.002 1
I
COM_(ON)
COM_ On-Leakage Current (Note 6)
TA= T
MIN
to T
MAX
-1 0.001 1
-10 10
V+ = 4.75V, VNO_ _ = 3V, I
COM_
= 4mA
R
ON
On-Resistance Ω
Ω
V+ = 4.75V, V
NO
_ _ = 3V,
I
COM_
= 4mA
∆R
ON
On-Resistance Match Between Channels (Note 4)
Ω
V+ = 4.75V; VNO_ _ = 1V, 2V, 3V; I
COM_
= 4mA
R
FLAT
On-Resistance Flatness (Note 5)
nA
V+ = 5.25V; VNO_ _ = 1V, 4.5V; V
COM_
= 4.5V, 1V
INO_ _
(OFF)
NO_ _ Off-Leakage Current (Note 6)
V+ = 5.25V; VNO_ _ = 1V, 4.5V; V
COM_
= 4.5V, 1V
I
COM_(OFF)
COM_ Off-Leakage Current (Note 6)
nA
ANALOG SWITCHES
AUDIO PERFORMANCE
Serially Controlled
Audio/Video Switches
_______________________________________________________________________________________ 3
MAX4584/MAX4585
ELECTRICAL CHARACTERISTICS—Single +5V Supply (continued)
(V+ = +5V ±5%, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)
POWER SUPPLY
Off-Isolation (Note 7) V
ISO(V)
-48 dB
VA= 1V
RMS
, fIN= 10MHz,
RL= 50Ω, Figure 8
TA= +25°C 275 400
nsTurn-On Time t
ON
V
NO_ _
= 2.5V, CL= 35pF, RL= 5kΩ
-0.1dB Bandwidth BW 5 MHz
-3dB Bandwidth BW 300 MHzRS= 50Ω, RL= 50Ω
RS= 75Ω, RL= 1kΩ
PARAMETER SYMBOL MIN TYP MAX UNITS
NO_ _ Off-Capacitance C
OFF
5 pF
nsTurn-Off Time
Break-Before-Make Time t
BBM
10 50 ns
t
OFF
V
NO_ _
= 2.5V, CL= 35pF, RL= 300Ω
V
NO_ _
= 2.5V, Figure 6
Charge Injection Q 3 pC
Power-Supply Voltage Range V+ 2.7 5.5 V Supply Current I+ 510µA
Channel-to-Channel Crosstalk V
CT(V)
-60 dB
VA= 1V
RMS
, f
IN
= 10MHz,
RS= 50Ω, Figure 8
CONDITIONS
fIN= 1MHz
TA= +25°C 125 200
CL= 1.0nF, VS= 0, RS= 0, Figure 7
All logic inputs = 0 or V+
TA= T
MIN
to T
MAX
500
TA= T
MIN
to T
MAX
250
VIDEO PERFORMANCE
DYNAMIC TIMING (Notes, 8, 11, and Figure 5)
MAX4584/MAX4585
Serially Controlled Audio/Video Switches
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS—Single +3V Supply
(V+ = +3.0V ±10%, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.)
nA
-1 0.001 1
V+ = 3.6V; V
COM
_ = 0.5V, 3V;
V
NO_ _
= 3V, 0.5V
I
NO_ _(OFF)
NO_ _ Off-Leakage Current (Notes 6, 9)
-10 10TA= T
MIN
to T
MAX
TA= +25°C
nA
-1 0.001 1
V+ = 3.6V; V
COM
_ = 0.5V, 3V;
V
NO_ _
= 3V, 0.5V
I
COM_(OFF)
COM_ Off-Leakage Current (Notes 6, 9)
-10 10TA= T
MIN
to T
MAX
TA= +25°C
ns10 100t
BBM
Break-Before-Make Time V
NO_ _
= 1.5V, Figure 6
500
200 350
V
NO_ _
= 1.5V,
RL= 300Ω, CL= 35pF
t
OFF
Turn-Off Time
TA= T
MIN
to T
MAX
TA= +25°C
Ω
35
V+ = 2.7V, V
NO_ _
= 1V,
I
COM_
= 4mA
∆R
ON
On-Resistance Match Between Channels (Note 4)
6TA= T
MIN
to T
MAX
TA= +25°C
1000
ns
400 800
V
NO_ _
= 1.5V,
RL= 5kΩ, CL= 35pF
t
ON
Turn-On Time
pF5fIN= 1MHzC
OFF
NO_ _ Off-Capacitance
dB-60
VA= 0.5V
RMS
, fIN= 10MHz, RS= 50Ω,
Figure 8
V
CT(V)
Channel-to-Channel Crosstalk
dB-48
VA= 0.5V
RMS
, fIN= 10MHz, RL= 50Ω,
Figure 8
V
ISO(V)
Off-Isolation
PARAMETER SYMBOL MIN TYP MAX UNITS
dB-84
VA= 0.5V
RMS
, fIN= 20kHz, RS= 600Ω,
Figure 8
V
CT(A)
Channel-to-Channel Crosstalk
dB-83
VA= 0.5V
RMS
, fIN= 20kHz, RL= 600Ω,
Figure 8
V
ISO(A)
Off-Isolation (Note 7)
nA
-1 0.002 1
V+ = 3.6V; V
COM_
= 0.5V, 3V; VNO_ _ = 0.5V, 3V, or floating
I
COM_(ON)
COM _ On-Leakage Current (Notes 6, 9)
CONDITIONS
TA= T
MIN
to T
MAX
-10 10TA= T
MIN
to T
MAX
TA= +25°C
TA= +25°C
ns
Ω
310
V+= 2.7V; V
NO_ _ =
1V, 1.5V, 2V;
I
COM_
= 4mA
R
FLAT
On-Resistance Flatness (Note 5)
12TA= T
MIN
to T
MAX
TA= +25°C
V0V+
V
NO_ _
,
V
COM_
Analog Signal Range (Note 3)
Ω
65 110
V+ = 2.7V, V
NO_ _
= 1V,
I
COM_
= 4mA
R
ON
On-Resistance
130TA= T
MIN
to T
MAX
TA= +25°C
MHz200RS= 50Ω, RL= 50ΩBW-3dB Bandwidth
ANALOG SWITCHES
AUDIO PERFORMANCE
VIDEO PERFORMANCE
DYNAMIC TIMING (Notes 8, 11, and Figure 5)
MAX4584/MAX4585
Serially Controlled
Audio/Video Switches
_______________________________________________________________________________________ 5
I/O INTERFACE CHARACTERISTICS
(V+ = +2.7V to +5.25V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.)
2-WIRE TIMING CHARACTERISTICS
(Figures 1 and 2, V+ = +2.7V to +5.25V, f
SCL
= 100kHz, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
T
A
= +25°C.)
UNITSMIN TYP MAXCONDITIONSSYMBOLPARAMETER
ns
20 +
300
0.1C
B
t
R
SCL/SDA Rise Time (Note 10)
µs4.0t
HIGH
Clock High Period
µs4.7t
LOW
Clock Low Period
ns250t
SU:DAT
Data Setup Time
µs0t
HD:DAT
Data Hold Time
µs4.0t
SU:STO
Stop Condition Setup Time
µs4.7t
BUF
Bus Free Time Between Stop and Start Conditions
0 100V+ = 2.7V to 5.25V
f
SCL
SCL Clock Frequency
ns
20 +
300
0.1C
B
t
F
SCL/SDA Fall Time (Note 10)
µs4.0The first clock is generated after this period.t
HD:STA
Hold Time After Start Condition
kHz
400V+ = 4.75V to 5.25V
pF5C
IN
Input Capacitance
V0.2V
HYST
Input Hysteresis
UNITSMIN TYP MAXCONDITIONSSYMBOLPARAMETER
µA-1 0.01 1Digital inputs = 0 or V+I
LEAK
Input Leakage Current
V+ = 3V
V+ = 3V 0.6
2
V
3V+ = 5V
V
IH
Input High Voltage
V
0.8V+ = 5V
V
IL
Input Low Voltage
V0.4I
SINK
= 6mAV
OL
Output Low Voltage
DIGITAL INPUTS (SCLK, DIN, CS, SCL, SDA, A)
DIGITAL OUTPUT (SDA)
MAX4584/MAX4585
Serially Controlled Audio/Video Switches
6 _______________________________________________________________________________________
3-WIRE TIMING CHARACTERISTICS
(Figures 3 and 4, V+ = +2.75V to +5.25V, fOP= 2.1MHz, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
T
A
= +25°C.)
Note 2: Algebraic convention is used in this data sheet; the most negative value is shown in the minimum column. Note 3: Guaranteed by design. Not subject to production testing. Note 4: ∆R
ON
= R
ON(MAX)
- R
ON(MIN)
.
Note 5: 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 T
A
= +25°C.
Note 7: Off-isolation = 20 log (V
COM
_ / VNO_ _), V
COM
_ = 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: Leakage testing is guaranteed by testing with a +5.25V supply. Note 10: C
B
= capacitance of one bus line in pF. Tested with CB= 400pF.
Note 11: Typical values are for MAX4584 devices.
V
COM
(V)
30
35
65
45
40
50
55
60
70
012345
ON-RESISTANCE
vs. V
COM
AND SUPPLY VOLTAGE
MAX4584/5-01
R
ON
(Ω)
V+ = 2.7V
V+ = 3.0V
V+ = 4.0V
V+ = 5.0V
V+ = 5.5V
V
COM
(V)
30
50
40
35
45
55
012
345
ON-RESISTANCE
vs. V
COM
AND TEMPERATURE (V+ = 5V)
MAX4584/5-02
R
ON
(Ω)
TA = -40°C
TA = -55°C
TA = +125°C
TA = +85°C
TA = +25°C
T
A
= -40°C
T
A
= -55°C
T
A
= +85°C
T
A
= +25°C
T
A
= +125°C
V
COM
(V)
30
65
60
45
40
35
55
50
75
70
0
1.0
1.5
2.0
0.5
2.5
3.0
ON-RESISTANCE
vs. V
COM
AND TEMPERATURE (V+ = 3.3V)
MAX4584/5-03
R
ON
(Ω)
Typical Operating Characteristics
(V+ = +5V, TA = +25°C, unless otherwise noted.)
SCLK Pulse Width High t
CH
200
V+ = 4.75V to 5.25V 10
ns
Fall Time (SCLK, DIN, CS)
t
F
2 µs
SCLK Pulse Width Low t
CL
200 ns
CS Rise to SCLK Hold
t
CSH
0 ns
Rise Time (SCLK, DIN, CS)
t
R
DIN to SCLK Setup t
DS
100 ns
Operating Frequency f
OP
V+ = 2.7V to 5.25V 0 2.1
MHz
DIN to SCLK Hold t
DH
0 ns
2 µs
CS Fall to SCLK Rise Setup
t
CSS
100 ns
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CS Pulse Width High
t
CSW
40 ns
MAX4584/MAX4585
Serially Controlled
Audio/Video Switches
_______________________________________________________________________________________
7
Typical Operating Characteristics (continued)
(V+ = +5V, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. TEMPERATURE
5.0
4.9
4.8
4.7
4.6
4.5
4.4
4.3
SUPPLY CURRENT (µA)
4.2
4.1
4.0
-55 -15 5 25-35 45 65 85 105 125 TEMPERATURE (°C)
MAX4584/5-04
TURN-ON/TURN-OFF TIMES
vs. TEMPERATURE
350
300
250
200
TIME (ns)
150
100
50
0
-55 -15 5-35 25 45 65 85 105 125
t
ON
t
OFF
TEMPERATURE (°C)
MAX4584/5-07
CURRENT (nA)
CHARGE INJECTION
vs. V
V
COM
COM
(V)
3
2
1
0
-1
-2
CHARGE INJECTION (pC)
-3
-4 021 345
OFF-LEAKAGE CURRENT
vs. TEMPERATURE
10
0.1
0.01
0.001
1
I
NO (OFF)
V
NO
V
COM
I
AT
NO (OFF)
= 1.0V
V
NO
V
= 4.5V
COM
-55 5-15
-35 65 125
TEMPERATURE (°C)
I V V
= 4.5V
= 1.0V
COM (OFF)
= 1.0V
COM
= 4.5V
NO
AT
25
I
COM (OFF)
= 4.5V
V
COM
V
= 1.0V
NO
AT
45 85
AT
105
MAX4584/5-05
MAX4584/5-08a
CURRENT (nA)
700
600
500
400
TIME (ns)
300
200
100
10
1
0.1
0.01
0.001
TURN-ON/TURN-OFF TIMES
vs. SUPPLY VOLTAGE
t
ON
t
OFF
0
2.5 3.5 4.03.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
ON-LEAKAGE CURRENT
vs. TEMPERATURE
I
AT
COM (ON)
V
= 1.0V
COM
= FLOAT
V
NO
I
AT
COM (ON)
= 4.5V
V
COM
V
= FLOAT
NO
25
-55 5-15
-35 65 125
45 85
TEMPERATURE (°C)
105
MAX4584/5-06
MAX4584/5-08b
AUDIO FREQUENCY RESPONSE
0
600Ω IN AND OUT
-10
-20
-30
-40
-50
LOSS (dB)
-60
-70
-80
-90
-100
0.01 1 100.1 100 FREQUENCY (MHz)
OFF-ISOLATION
CROSSTALK
MAX4584/5-09
0
-10
-20
-30
-40
-50
LOSS (dB)
-60
-70
-80
-90
-100
VIDEO FREQUENCY RESPONSE
INSERTION LOSS
OFF-ISOLATION
0.1 100101 FREQUENCY (MHz)
CROSSTALK
50Ω IN AND OUT
MAX4584/5-10
CLK
5V/div
2V/div
t
2V/div
t
OFF
TURN-ON/TURN-OFF TIMES
MAX4584/5-11
ON
TIME (100ns/div)
MAX4584/MAX4585
_______________Detailed Description
The MAX4584/MAX4585 are serial-interface, program­mable switches. Each device contains one normally open (NO) single-pole/single-throw (SPST) switch and one single-pole/double-throw (SPDT) switch. The switches are independently controlled through the on­chip serial interface. The MAX4584 uses a 2-wire I2C­compatible serial communications protocol; the MAX4585 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 of 20kHz and video frequencies up to 10MHz. They feature 65Ω on-resistance, 4Ω on-resistance matching between channels, and 5Ω on-resistance flat-
ness. Audio off-isolation is -83dB at 20kHz, and crosstalk is at least -84dB at 20kHz. Video off-isolation is -48dB at 10MHz, and crosstalk is at least -60dB at 10MHz.
__________Applications Information
Switch Control
The MAX4584/MAX4585 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 clos-
Serially Controlled Audio/Video Switches
8 _______________________________________________________________________________________
Pin Description
Figure 1. 2-Wire Serial-Interface Timing Diagram
Normally Open TerminalNO1A
FUNCTION
1010
PIN
NAME
MAX4584 MAX4585
LSB+2 of the 2-Wire Serial-Interface Address Field2 A Chip Select of the 3-Wire Serial Interface—
CS
Data Input of the 3-Wire Serial Interface—
Clock Input of the 2-Wire Serial Interface
Normally Open SPST Terminal
Ground
Data Input of the 2-Wire Serial Interface3
DIN
SCL
NO2
GND
SDA
Analog Switch SPDT Common Terminal1 COM1
Supply VoltageV+
Clock Input of the 3-Wire Serial Interface
5
SCLK
Analog Switch SPST Common Terminal
6
COM2
Normally Open TerminalNO1B
1
—
2
—
3
—
6
8
44
5—
77
9
8
9
SDA
SCL
tHD,
STA
20%
70%
20%
t
70%
LOW
t
70% 20%
tSU,
DAT
70% 70% 20%
t
HIGH
t
R
F
20%
tHD,
tSU,
DAT
70%
20%
STA
70% 70% 70%
tHD,
STA
tSU,
STO
70% 20%
t
BUF
START CONDITIONSTOP CONDITIONREPEATED START CONDITIONSTART CONDITION
70%
20%
es the associated switch (Table 2). A logic “0” in any data-bit location opens the associated switch.
2-Wire Serial Interface
The MAX4584 uses a 2-wire I2C-compatible serial inter­face. The COM_ register uses the “SendByte” protocol, which consists of an address byte followed by a com­mand byte (Table 1).
To address a given IC, bit A in the address byte must duplicate the value present at the A pin of that IC. 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 MAX4584 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.
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 is then free for another transmission.
Slave Address (Address Byte)
The MAX4584 uses an 8-bit-long slave address. To select a slave address, connect A to V+ or GND. The MAX4584 has two possible slave addresses, so a maxi­mum of two of these devices may share the same address line. The slave device MAX4584 monitors the serial bus continuously, waiting for a start condition fol­lowed by an address byte. When a slave device recog­nizes its address (01101A10), it acknowledges that it is ready for further communication by pulling the SDA line low for one clock period.
MAX4584/MAX4585
Serially Controlled
Audio/Video Switches
_______________________________________________________________________________________ 9
Table 1. Command-Bit Mapping
Table 3. Address Bit Map
Table 2. Truth Table
X—XD4
X—XD5
X—XD6
X—XD7 (MSB)
POWER-UP
STATE
TERMINALSSWITCH
COMMAND
BIT
0 (Open)10, 1NO1A to COM1D0 (LSB)
1 (Closed)9, 1NO1B to COM1D1
0 (Open)6, 7NO2 to COM2D2
X—XD3
CLOSED1
OPEN0
NO1_ AND NO2LOGIC
0110 11101
0110 10100
ADDRESSADDRESS BIT (A)
Figure 2. A Complete 2-Wire Serial-Interface Transmission
X = Don’t care
SDA
SCL
START CONDITION STOP CONDITION
SLAVE ADDRESS BYTE
MSB
LSB LSBACK ACK
COMMAND BYTE
MSB
MAX4584/MAX4585
3-Wire Serial Interface
The MAX4585 3-wire serial interface is SPI/ QSPI/MICROWIRE compatible. An active-low chip­select (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 are needed in each write cycle. The first bit clocked into the MAX4585 is the command byte’s MSB; the last bit clocked in is the data byte’s LSB. The first 5 bits of the command byte are “don’t care.” While shifting data, the device remains in its original configuration. After all 8 bits are clocked into the input shift register, a rising edge on CS latches the data into the MAX4585’s 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.
Addressable Serial Interface
To program several MAX4585s individually using a sin­gle µP, connect DIN of each MAX4585 together and control CS on each MAX4585 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 MAX4585 is addressed at a time.
Power-Up State
The MAX4584/MAX4585 feature a preset power-up state. See Table 1 to determine the power-up state of these devices.
Serially Controlled Audio/Video Switches
10 ______________________________________________________________________________________
Figure 3. 3-Wire Serial-Interface Timing Diagram
Figure 4. A Complete 3-Wire Serial Transmission
TRANSISTOR COUNT: 2259
___________________Chip Information
CS
SCLK
DIN
CS
SCLK
DATA CLOCKED IN
DIN
MSB
20%
t
CSS
t
DH
t
DS
D7
SWITCHES UPDATED
D7 D6 D5 D4
INPUT DATA BITS
t
CL
20% 20% 20% 20% 20%
D6
D3 D2 D1 D0
LSB
70%
70%
t
CSO
20%
t
t
CH
70%
D1 D0
70%
CSH
t
CSW
MAX4584/MAX4585
Serially Controlled
Audio/Video Switches
______________________________________________________________________________________ 11
Figure 5. Switching Time
Test Circuits/Timing Diagrams
Figure 6. Break-Before-Make Interval
MAX4584 MAX4585
V
µP
NO__
IN
2 OR 3
SERIAL INTERFACE
C
INCLUDES FIXTURE AND STRAY CAPACITANCE.
L
V
= VIN [RL / (RL + RON)]
OUT
MAX4584 MAX4585
V+
V+
DECODER/
CONTROLLER
GND
V+
10nF
COM_
10nF
3V
SCL
0
V
SCL
V
OUT
OUT
0
V
OUT
0
3V
CS
0
V
OUT
0
V
OUT
0
3V
0V
50%
50%
2-WIRE
V
OUT
R
C
L
L
35pF
3-WIRE
50%
t
OFF
t
OFF
t
ON
t
ON
ACKNOWLEDGE BIT
0.5V
V
0.5V
OUT -
0.5
V
- 0.5
OUT
ACKNOWLEDGE BIT
80%
< 20ns
t
R
t
< 20ns
F
tR < 20ns
< 20ns
t
F
NO__
V
IN
NO__
2 OR 3
µP
C
INCLUDES FIXTURE AND STRAY CAPACITANCE.
L
V
= V
OUT
COM
V+
DECODER/
CONTROLLER
SERIAL INTERFACE
GND
[RL / (RL + RON)]
COM_
COM_
2-WIRE
3-WIRE
0
t
50%
t
BBM
80%
BBM
CS
3V
V
OUT
0
V
OUT
C
R
L
L
MAX4584/MAX4585
Serially Controlled Audio/Video Switches
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.
12
____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
Figure 8. Off-Isolation and Crosstalk
Figure 7. Charge Injection
Serially Controlled Audio/Video Switches
Test Circuits/Timing Diagrams (continued)
MAX4584 MAX4585
V+
10nF
DECODER/
CONTROLLER
SERIAL INTERFACE
V+
GND
COM_
C
L
1000pF
V
OUT
NO_
2 OR 3
µP
∆V
IS THE MEASURED VOLTAGE DUE TO CHARGE
OUT
TRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF.
• C
Q = ∆V
OUT
L
2-WIRE
3-WIRE
V
V
SCL
OUT
CS
DIN
OUT
ACKNOWLEDGE
3V
0
3V
0
3V
0
BIT
∆V
8-BIT COMMAND
∆V
OUT
OUT
ACKNOWLEDGE
BIT
MAX4584 MAX4585
2/3
ANALYZER
SIGNAL GENERATOR 0dBm
b) CROSSTALK
R
L
10nF
COM1
NO2
V+
V+
DECODER/
CONTROLLER
GND
NO__
COM2
N.C.
2/3
50Ω
ANALYZER
SIGNAL GENERATOR 0dBm
a) OFF-ISOLATION
V+
10nF
V+
COM_
R
L
NO__
DECODER/
CONTROLLER
GND
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