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19-1521; Rev 0; 8/99
Serially Controlled Audio/Video Switches
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 65 on-resistance, 4 on-resistance matching between channels, and 5 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 I2CTM-compatible serial interface; the MAX4585 uses a 3-wire SPITM/QSPITM/ MICROWIRETM-compatible interface. Both devices are available in a 10-pin MAX package and are specified for the extended-industrial (-40C to +85C) temperature range. o SPST and SPDT Switches o 65 (max) RON with +5V Supply o Audio Performance -83dB Off-Isolation at 20kHz -84dB Crosstalk at 20kHz o Video Performance -48dB Off-Isolation at 10MHz -60dB Crosstalk at 10MHz o Serial Interface 2-Wire I2C Compatible (MAX4584) 3-Wire SPI/QSPI/MICROWIRE Compatible (MAX4585)
Features
o +2.7V to +5.5V Single-Supply Operation
MAX4584/MAX4585
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
Ordering Information
PART MAX4584EUB MAX4585EUB TEMP. RANGE -40C to +85C -40C to +85C PIN-PACKAGE 10 MAX 10 MAX
Pin Configuration/ Functional Diagram
TOP VIEW
MAX4584 MAX4585
COM1 1 A (CS) 2 SDA (DIN) 3 V+ 4 SCL (SCLK) 5 10 NO1A 9 8 7 6 NO1B GND COM2 NO2
I2C is a trademark of Philips Corp. SPI/QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
MAX
( ) ARE FOR MAX4585 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.
Serially Controlled Audio/Video Switches MAX4584/MAX4585
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 = +70C) MAX (derate 4.1mW/C above +70C) .....................330mW Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+300C
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.
Note 1: Signals on NO_ _ or COM_ exceeding V+ or ground are clamped by internal diodes. Limit forward-diode current to maximum current rating.
ELECTRICAL CHARACTERISTICS--Single +5V Supply
(V+ = +5V 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2) PARAMETER ANALOG SWITCHES Analog Signal Range (Note 3) VNO_ _, VCOM_ V+ = 4.75V, VNO_ _ = 3V, ICOM_ = 4mA V+ = 4.75V, VNO_ _ = 3V, ICOM_ = 4mA V+ = 4.75V; VNO_ _ = 1V, 2V, 3V; ICOM_ = 4mA V+ = 5.25V; VNO_ _ = 1V, 4.5V; VCOM_ = 4.5V, 1V V+ = 5.25V; VNO_ _ = 1V, 4.5V; VCOM_ = 4.5V, 1V V+ = 5.25V; VNO_ _ = 1V, 4.5V, or floating; VCOM_ = 1V, 4.5V TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX -1 -10 -1 -10 -1 -10 0.002 0.001 0.001 2 2 0 45 V+ 65 80 4 5 5 6.5 1 nA 10 1 nA 10 1 nA 10 V SYMBOL CONDITIONS MIN TYP MAX UNITS
On-Resistance
RON
On-Resistance Match Between Channels (Note 4)
RON
On-Resistance Flatness (Note 5)
RFLAT
NO_ _ Off-Leakage Current (Note 6)
INO_ _(OFF)
COM_ Off-Leakage Current (Note 6)
ICOM_(OFF)
COM_ On-Leakage Current (Note 6) AUDIO PERFORMANCE Off-Isolation (Note 7) Channel-to-Channel Crosstalk AUDIO PERFORMANCE 2
ICOM_(ON)
VISO(A) VCT(A)
VA = 1VRMS, fIN = 20kHz, RL = 600, Figure 8 VA = 1VRMS, fIN = 20kHz, RS = 600, Figure 8
-83 -84
dB dB
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Serially Controlled Audio/Video Switches
ELECTRICAL CHARACTERISTICS--Single +5V Supply (continued)
(V+ = +5V 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2) PARAMETER VIDEO PERFORMANCE Off-Isolation (Note 7) Channel-to-Channel Crosstalk -0.1dB Bandwidth -3dB Bandwidth NO_ _ Off-Capacitance VISO(V) VCT(V) BW BW COFF VA = 1VRMS, fIN = 10MHz, RL = 50, Figure 8 VA = 1VRMS, fIN = 10MHz, RS = 50, Figure 8 RS = 75, RL = 1k RS = 50, RL = 50 fIN = 1MHz VNO_ _ = 2.5V, CL = 35pF, RL = 5k VNO_ _ = 2.5V, CL = 35pF, RL = 300 VNO_ _ = 2.5V, Figure 6 CL = 1.0nF, VS = 0, RS = 0, Figure 7 2.7 All logic inputs = 0 or V+ 5 -48 -60 5 300 5 dB dB MHz MHz pF SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX4584/MAX4585
DYNAMIC TIMING (Notes, 8, 11, and Figure 5) TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 10 50 3 5.5 10 125 275 400 ns 500 200 ns 250 ns pC V A Turn-On Time tON
Turn-Off Time Break-Before-Make Time Charge Injection POWER SUPPLY Power-Supply Voltage Range Supply Current
tOFF tBBM Q V+ I+
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Serially Controlled Audio/Video Switches MAX4584/MAX4585
ELECTRICAL CHARACTERISTICS--Single +3V Supply
(V+ = +3.0V 10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER ANALOG SWITCHES Analog Signal Range (Note 3) VNO_ _, VCOM_ RON V+ = 2.7V, VNO_ _ = 1V, ICOM_ = 4mA V+ = 2.7V, VNO_ _ = 1V, ICOM_ = 4mA V+ = 2.7V; VNO_ _ = 1V, 1.5V, 2V; ICOM_ = 4mA V+ = 3.6V; VCOM_ = 0.5V, 3V; VNO_ _ = 3V, 0.5V V+ = 3.6V; VCOM_ = 0.5V, 3V; VNO_ _ = 3V, 0.5V V+ = 3.6V; VCOM_ = 0.5V, 3V; VNO_ _ = 0.5V, 3V, or floating TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX -1 -10 -1 -10 -1 -10 0.002 0.001 0.001 3 3 0 65 V+ 110 130 5 6 10 12 1 nA 10 1 nA 10 1 nA 10 V SYMBOL CONDITIONS MIN TYP MAX UNITS
On-Resistance
On-Resistance Match Between Channels (Note 4) On-Resistance Flatness (Note 5)
RON
RFLAT
NO_ _ Off-Leakage Current (Notes 6, 9)
INO_ _(OFF)
COM_ Off-Leakage Current (Notes 6, 9)
ICOM_(OFF)
COM _ On-Leakage Current (Notes 6, 9) AUDIO PERFORMANCE Off-Isolation (Note 7) Channel-to-Channel Crosstalk VIDEO PERFORMANCE Off-Isolation Channel-to-Channel Crosstalk -3dB Bandwidth NO_ _ Off-Capacitance
ICOM_(ON)
VISO(A) VCT(A)
VA = 0.5VRMS, fIN = 20kHz, RL = 600, Figure 8 VA = 0.5VRMS, fIN = 20kHz, RS = 600, Figure 8
-83 -84
dB dB
VISO(V) VCT(V) BW COFF
VA = 0.5VRMS, fIN = 10MHz, RL = 50, Figure 8 VA = 0.5VRMS, fIN = 10MHz, RS = 50, Figure 8 RS = 50, RL = 50 fIN = 1MHz VNO_ _ = 1.5V, RL = 5k, CL = 35pF TA = +25C TA = TMIN to TMAX
-48 -60 200 5 400 200 10 100 800 1000 350 500
dB dB MHz pF
DYNAMIC TIMING (Notes 8, 11, and Figure 5) Turn-On Time Turn-Off Time Break-Before-Make Time tON tOFF tBBM ns ns ns
TA = +25C VNO_ _ = 1.5V, RL = 300, CL = 35pF TA = TMIN to TMAX VNO_ _ = 1.5V, Figure 6
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Serially Controlled Audio/Video Switches
I/O INTERFACE CHARACTERISTICS
(V+ = +2.7V to +5.25V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX 0.8 0.6 3 2 0.2 Digital inputs = 0 or V+ -1 0.01 5 ISINK = 6mA 0.4 1 UNITS DIGITAL INPUTS (SCLK, DIN, CS, SCL, SDA, A) V+ = 5V Input Low Voltage VIL V+ = 3V Input High Voltage Input Hysteresis Input Leakage Current Input Capacitance DIGITAL OUTPUT (SDA) Output Low Voltage VOL V VIH VHYST ILEAK CIN V+ = 5V V+ = 3V
MAX4584/MAX4585
V V V A pF
2-WIRE TIMING CHARACTERISTICS
(Figures 1 and 2, V+ = +2.7V to +5.25V, f SCL = 100kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SCL Clock Frequency Bus Free Time Between Stop and Start Conditions Hold Time After Start Condition Stop Condition Setup Time Data Hold Time Data Setup Time Clock Low Period Clock High Period SCL/SDA Rise Time (Note 10) SCL/SDA Fall Time (Note 10) SYMBOL fSCL tBUF tHD:STA tSU:STO tHD:DAT tSU:DAT tLOW tHIGH tR tF The first clock is generated after this period. CONDITIONS V+ = 2.7V to 5.25V V+ = 4.75V to 5.25V 4.7 4.0 4.0 0 250 4.7 4.0 20 + 0.1CB 20 + 0.1CB 300 300 MIN 0 TYP MAX 100 400 UNITS kHz s s s s ns s s ns ns
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Serially Controlled Audio/Video Switches MAX4584/MAX4585
3-WIRE TIMING CHARACTERISTICS
(Figures 3 and 4, V+ = +2.75V to +5.25V, fOP = 2.1MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Operating Frequency DIN to SCLK Setup DIN to SCLK Hold CS Fall to SCLK Rise Setup CS Rise to SCLK Hold SCLK Pulse Width Low SCLK Pulse Width High Rise Time (SCLK, DIN, CS) Fall Time (SCLK, DIN, CS) CS Pulse Width High Note 2: Note 3: Note 4: Note 5: SYMBOL fOP tDS tDH tCSS tCSH tCL tCH tR tF tCSW 40 CONDITIONS V+ = 2.7V to 5.25V V+ = 4.75V to 5.25V MIN 0 100 0 100 0 200 200 2 2 TYP MAX 2.1 10 UNITS MHz ns ns ns ns ns ns s s ns
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 = +25C. Note 7: Off-isolation = 20 log (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 300 load to ground. Turn-on time is defined at the output of the switch for a 0.5V change and measured with a 5k 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: CB = capacitance of one bus line in pF. Tested with CB = 400pF. Note 11: Typical values are for MAX4584 devices.
Typical Operating Characteristics
(V+ = +5V, TA = +25C, unless otherwise noted.)
ON-RESISTANCE vs. VCOM AND SUPPLY VOLTAGE
MAX4584/5-01
ON-RESISTANCE vs. VCOM AND TEMPERATURE (V+ = 5V)
MAX4584/5-02
ON-RESISTANCE vs. VCOM AND TEMPERATURE (V+ = 3.3V)
70 65 60 TA = +25C TA = +85C TA = +125C
MAX4584/5-03
70 V+ = 2.7V 65 60 RON () 55 50 45 40 35 30 0 1 2 3 VCOM (V) 4 5 V+ = 5.5V V+ = 3.0V V+ = 4.0V
55 50 TA = +125C TA = +85C
75
RON ()
RON ()
45 TA = +25C 40
V+ = 5.0V
55 50 45 TA = -40C TA = -55C
35 TA = -55C 30 0 1 2 VCOM (V) 3
TA = -40C
40 35 30
4
5
0
0.5
1.0
1.5 VCOM (V)
2.0
2.5
3.0
6
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Serially Controlled Audio/Video Switches
Typical Operating Characteristics (continued)
(V+ = +5V, TA = +25C, unless otherwise noted.)
MAX4584/MAX4585
SUPPLY CURRENT vs. TEMPERATURE
MAX4584/5-04
4.9 4.8 SUPPLY CURRENT (A) 4.7 4.6 4.5 4.4 4.3 4.2 4.1 4.0 -55 -35 -15 5 25 45 65
MAX4584/5-05
2 CHARGE INJECTION (pC) 1
600 500 TIME (ns) 400 300 200 100 0 tON
0 -1 -2 -3 -4
tOFF
85 105 125
0
1
2
3
4
5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
TEMPERATURE (C)
VCOM (V)
SUPPLY VOLTAGE (V)
TURN-ON/TURN-OFF TIMES vs. TEMPERATURE
MAX4584/5-07
OFF-LEAKAGE CURRENT vs. TEMPERATURE
ICOM (OFF) AT VCOM = 4.5V VNO = 1.0V 1 CURRENT (nA) ICOM (OFF) AT VCOM = 1.0V VNO = 4.5V INO (OFF) AT VNO = 4.5V VCOM = 1.0V INO (OFF) AT VNO = 1.0V VCOM = 4.5V -55 -35 -15 5 25 45 65 85 105 125
MAX4584/5-08a
ON-LEAKAGE CURRENT vs. TEMPERATURE
ICOM (ON) AT VCOM = 1.0V VNO = FLOAT
MAX4584/5-08b MAX4584/5-11
350 300 250 TIME (ns) 200 150 100 tOFF 50 0 -55 -35 -15 5 25 45 65 tON
10
10
1 CURRENT (nA)
0.1
0.1
ICOM (ON) AT VCOM = 4.5V VNO = FLOAT
0.01 0.001 85 105 125
0.01 0.001 -55 -35 -15 5 25 45 65 85 105 125
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
AUDIO FREQUENCY RESPONSE
MAX4584/5-09
VIDEO FREQUENCY RESPONSE
-10 -20 -30 LOSS (dB) -40 -50 -60 -70 CROSSTALK tOFF 2V/div 50 IN AND OUT 0.1 1 10 100 OFF-ISOLATION tON 2V/div INSERTION LOSS
MAX4584/5-10
TURN-ON/TURN-OFF TIMES
0 -10 -20 -30 LOSS (dB) -40 -50 -60 -70 -80 -90 -100 0.01 0.1 1 FREQUENCY (MHz) 10 OFF-ISOLATION CROSSTALK 600 IN AND OUT
0
CLK 5V/div
-80 -90 -100 100
TIME (100ns/div)
FREQUENCY (MHz)
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MAX4584/5-06
5.0
CHARGE INJECTION vs. VCOM
3 700
TURN-ON/TURN-OFF TIMES vs. SUPPLY VOLTAGE
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Serially Controlled Audio/Video Switches MAX4584/MAX4585
Pin Description
PIN MAX4584 1 2 -- 3 -- 4 5 -- 6 7 8 9 10 MAX4585 1 -- 2 -- 3 4 -- 5 6 7 8 9 10 NAME COM1 A CS SDA DIN V+ SCL SCLK NO2 COM2 GND NO1B NO1A FUNCTION Analog Switch SPDT Common Terminal LSB+2 of the 2-Wire Serial-Interface Address Field Chip Select of the 3-Wire Serial Interface Data Input of the 2-Wire Serial Interface Data Input of the 3-Wire Serial Interface Supply Voltage Clock Input of the 2-Wire Serial Interface Clock Input of the 3-Wire Serial Interface Normally Open SPST Terminal Analog Switch SPST Common Terminal Ground Normally Open Terminal Normally Open Terminal
SDA
70% 20% tSU, DAT tLOW
70% 20% tSU, STA
70% 20%
70% 20% tBUF tHD, STA tSU, STO
70% 20%
tHD, DAT 70% 20% tHIGH tR tF REPEATED START CONDITION 70% 20% 70% 70%
SCL tHD, STA
70% 20%
70%
START CONDITION
STOP CONDITION
START CONDITION
Figure 1. 2-Wire Serial-Interface Timing Diagram
_______________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 65 on-resistance, 4 on-resistance matching between channels, and 5 on-resistance flat8
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
Table 1. Command-Bit Mapping
COMMAND BIT D7 (MSB) D6 D5 D4 D3 D2 D1 D0 (LSB) SWITCH X X X X X NO2 to COM2 NO1B to COM1 NO1A to COM1 TERMINALS -- -- -- -- -- 6, 7 9, 1 10, 1 POWER-UP STATE X X X X X 0 (Open) 1 (Closed) 0 (Open)
Table 2. Truth Table
LOGIC 0 1 NO1_ AND NO2 OPEN CLOSED
MAX4584/MAX4585
Table 3. Address Bit Map
ADDRESS BIT (A) 0 1 ADDRESS 0110 1010 0110 1110
X = Don't care
SLAVE ADDRESS BYTE SDA MSB SCL START CONDITION LSB ACK MSB
COMMAND BYTE
LSB
ACK
STOP CONDITION
Figure 2. A Complete 2-Wire Serial-Interface Transmission
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 (P) 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.
9
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Serially Controlled Audio/Video Switches MAX4584/MAX4585
70% tCSO 70%
CS
20% tCSS tCL 20% tDH tDS 20% tCH 20% 20% 70% 70%
20% tCSH
tCSW
SCLK
20%
DIN
D7
D6
D1
D0
Figure 3. 3-Wire Serial-Interface Timing Diagram
SWITCHES UPDATED CS
SCLK DATA CLOCKED IN DIN D7 MSB INPUT DATA BITS D6 D5 D4 D3 D2 D1 D0 LSB
Addressable Serial Interface To program several MAX4585s individually using a single P, 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.
Figure 4. A Complete 3-Wire Serial Transmission
___________________Chip Information
TRANSISTOR COUNT: 2259
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.
10
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Serially Controlled Audio/Video Switches
Test Circuits/Timing Diagrams
MAX4584 MAX4585
V+ 10nF 2-WIRE 0 V+ VIN NO_ _ COM_ VOUT RL 2 OR 3 P DECODER/ CONTROLLER SERIAL INTERFACE GND 3-WIRE CL INCLUDES FIXTURE AND STRAY CAPACITANCE. VOUT = VIN [RL / (RL + RON)] CL 35pF VOUT 0 tOFF tON VOUT - 0.5V ACKNOWLEDGE BIT 3V SCL 0 VOUT 0.5V 50% tR < 20ns tF < 20ns
MAX4584/MAX4585
3V CS 0 VOUT 0 tON VOUT 0 tOFF VOUT - 0.5 0.5 50%
Figure 5. Switching Time
SCL 3V 50% ACKNOWLEDGE BIT tR < 20ns tF < 20ns
MAX4584 MAX4585
V+ 10nF
0V VOUT 80% 2-WIRE V+
NO_ _ VIN NO_ _ 2 OR 3 P
COM_ COM_ RL DECODER/ CONTROLLER SERIAL INTERFACE GND VOUT 80% 3-WIRE VOUT CL 0 CS 3V 50% tBBM
CL INCLUDES FIXTURE AND STRAY CAPACITANCE. VOUT = VCOM [RL / (RL + RON)]
0 tBBM
Figure 6. Break-Before-Make Interval
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Serially Controlled Audio/Video Switches MAX4584/MAX4585
Test Circuits/Timing Diagrams (continued)
MAX4584 MAX4585
V+ 10nF 3V SCL V+ NO_ COM_ VOUT CL 1000pF 2 OR 3 P DECODER/ CONTROLLER SERIAL INTERFACE GND 3-WIRE VOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF. Q = VOUT * CL DIN 3V CS 0 3V 0 8-BIT COMMAND 2-WIRE VOUT VOUT 0 ACKNOWLEDGE BIT ACKNOWLEDGE BIT
VOUT
VOUT
Figure 7. Charge Injection
10nF
V+
MAX4584 MAX4585
10nF
V+
ANALYZER RL SIGNAL GENERATOR 0dBm
COM_V+ 2/3 DECODER/ CONTROLLER NO__ GND ANALYZER RL SIGNAL GENERATOR 0dBm
V+ COM1
NO__ N.C.
DECODER/ CONTROLLER NO2 GND COM2
2/3
50
a) OFF-ISOLATION
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.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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