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. 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.