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| DG458/459 Vishay Siliconix Fault-Protected Single 8-Ch/Differential 4-Ch Analog Multiplexers FEATURES D D D D D D D D Fault and Overvoltage Protection All Channels Off When Power Off Latchup-Proof Fast Switching--TA: 200 ns Break-Before-Make Switching Low On-Resistance: 180 W Low Power Consumption: 3 mW TTL and CMOS Compatible Inputs BENEFITS D D D D D D Improved Ruggedness Power Loss Protection Prevents Adjacent Channel Crosstalk Standard Logic Interface Superior Accuracy Fast Settling Time APPLICATIONS D D D D D Data Acquisition Systems Industrial Process Control Systems Avionics Test Equipment High-Rel Control Systems Telemetry DESCRIPTION The DG458 and DG459 are 8-channel single-ended and 4-channel differential analog multiplexers, respectively, incorporating fault protection. A series n-p-n MOSFET structure provides device and signal-source protection in the event of power loss or overvoltages. Under fault conditions the multiplexer input (or output) appears as an open circuit and only a few nanoamperes of leakage current will flow. This protects not only the multiplexer and the circuitry following it, but also protects the sensors or signal sources which drive the multiplexer. The DG458 and DG459 can withstand continuous overvoltage inputs up to "35 V. All digital inputs have TTL compatible logic thresholds. Break-before-make operation prevents channelto-channel interference. The DG458 and DG459 are improved pin-compatible replacements for HI-508A/509A and MAX358/359 multiplexers. FUNCTIONAL BLOCK DIAGRAM AND PIN CONFIGURATION DG458 Dual-In-Line A0 EN V- S1 S2 S3 S4 D A1 A2 GND V+ S5 S6 S7 S8 A0 EN V- S1a S2a S3a S4a Da DG459 Dual-In-Line A1 GND V+ S1b S2b S3b S4b Db 1 2 3 4 5 6 7 8 Decoders/Drivers 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 Decoders/Drivers 16 15 14 13 12 11 10 9 Top View Top View Document Number: 70064 S-52433--Rev. F, 06-Sep-99 www.vishay.com S FaxBack 408-970-5600 5-1 DG458/459 Vishay Siliconix TRUTH TABLES AND ORDERING INFORMATION TRUTH TABLE A2 X 0 0 0 0 1 1 1 1 DG458 EN 0 1 1 1 1 1 1 1 1 TRUTH TABLE On Switch None 1 2 3 4 5 6 7 8 DG459 On Switch None 1 2 3 4 A1 X 0 0 1 1 0 0 1 1 A0 X 0 1 0 1 0 1 0 1 A1 X 0 0 1 1 A0 X 0 1 0 1 EN 0 1 1 1 1 Logic "0" = VAL v 0.8 V Logic "1" = VAH w 2.4 V X = Don't Care ORDERING INFORMATION Temp Range -40 to 85_C Package 16-Pin Plastic DIP Part Number DG458DJ DG459DJ DG458AK/883 16-Pin CerDIP DG459AK/883 -55 to 125 C 55 125_C DG458AZ/883 LCC-20 DG459AZ/883 *Block Diagram and Pin Configuration not shown. ABSOLUTE MAXIMUM RATINGS V+ to V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 V V+ to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 V V- to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25 V VEN, VA Digital Input . . . . . . . . . . . . . . . . . . . . . . . . . . . (V-) -4 V to (V+) +4 V VS, Analog Input Overvoltage with Power On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (V-) -20 V to (V+) +20 V VS, Analog Input Overvoltage with Power Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -35 V to +35 V Continuous Current, S or D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA Peak Current, S or D (Pulsed at 1 ms, 10% Duty Cycle Max) . . . . . . . . . . . . . . . . . . . . . . . . . 40 mA Storage Temperature (AK Suffix) . . . . . . . . . . . . . . . . . . -65 to 150_C (DJ Suffix) . . . . . . . . . . . . . . . . . . -65 to 125_C Power Dissipation (Package)a 16-Pin Plastic DIPb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600 mW 16-Pin CerDIPc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000 mW LCC-20d . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000 mW Notes: a. All leads soldered or welded to PC board. b. Derate 6.3 mW/_C above 25_C. c. Derate 12 mW/_C above 75_C. d. Derate 10 mW/_C above 75_C. www.vishay.com S FaxBack 408-970-5600 5-2 Document Number: 70064 S-52433--Rev. F, 06-Sep-99 DG458/459 Vishay Siliconix SPECIFICATIONSa Test Conditions Unless Otherwise Specified Parameter Analog Switch Analog Signal Rangeg Drain-Source On-Resistance rDS(on) Matching Between Channelsh Source Off Leakage Current Drain Off Leakage Current Lk C t Differential Off Drain Leakage Current Drain On Leakage Current Lk C t VANALOG rDS(on) DrDS(on) IS(off) VD = "9.5 V, IS = -400 mA VD = "5 V, IS = -400 mA VD = 0 V, IS = -400 mA VEN = 0 V VS = "10 V, VD = #10 V VEN = 0 V VD = "10 V VS = #10 V DG459 Only DG458 ID(on) VS = VD = "10 V DG459 DG458 DG459 Full Room Full Room Room Room Full Room Full Room Full Room Room Full Room Full 0.1 0.05 0.45 180 6 0.03 0.1 0.1 -0.5 -50 -1 -200 -1 -100 -50 -2 -200 -2 -100 0.5 50 1 200 1 100 50 2 200 2 100 -1 -20 -1 -50 -2 -25 -20 -5 -50 -5 -25 1 20 1 50 2 25 20 5 50 5 25 -10 10 1.2 1.5 400 -10 10 1.5 1.8 400 V kW W % A Suffix -55 to 125_C D Suffix -40 to 85_C Symbol V+ = 15 V, V- = -15 V VAL = 0.8 V, VAH = 2.4 Vf Tempb Typc Mind Maxd Mind Maxd Unit ID(off) A nA IDIFF Fault Output Leakage Current (with Overvoltage) Input Leakage Current (with Overvoltage) Input Leakage Current (with Power Supplies Off) ID(off) VS = "33 V, VD = 0 V See Figure 2 VS = "25 V, VD = "10 V, See Figure 2 VS = "25 V, VSUPS = 0 V VD = A0, A1, A2, EN = 0 V Room Room Room 0.02 0.005 0.001 -5 -2 5 2 -10 -5 10 mA 5 nA IS(off) Digital Control Input Low Threshold Input Low Threshold Logic Input Control VAL VAL IA VA = 2.4 V or 0.8 V Full Full Full 2.4 -1 1 0.8 2.4 -1 1 0.8 V mA Dynamic Characteristics Transition Time Break-Before-Make Time Enable Turn-On Time Enable Turn-Off Time Settling Time tA tOPEN tON(EN) See Figure 5 tOFF(EN) ts To 0.1 % To 0.01% VEN = 0 V, RL = 1 kW, CL = 15 pF VS = 3 VRMS, f = 100 kHz f = 1 MHz See Figure 3 See Figure 4 Room Room Room Full Room Full Room Room Room Room Room DG458 DG459 DG458 DG459 Room Room Room Room 200 45 140 50 0.5 1.5 90 5 5 15 10 40 35 pF F 10 250 500 250 500 500 10 250 500 250 500 ms ns 500 Off Isolation Logic Input Capacitance Source Off Capacitance Drain Off Capacitance OIRR Cin CS(off) CD(off) CD(on) dB Drain On Capacitance Document Number: 70064 S-52433--Rev. F, 06-Sep-99 www.vishay.com S FaxBack 408-970-5600 5-3 DG458/459 Vishay Siliconix SPECIFICATIONSa Test Conditions Unless Otherwise Specified Parameter Power Supplies Positive Supply Current Negative Supply Current Power Supply Range for Continuous Operation I+ VEN = 5.0 or 0 V, VA = 0 V I- Room Full Room Full Room 0.05 -0.01 -0.1 -0.2 "4.5 "18 0.1 0.2 -0.1 -0.2 "4.5 "18 0.1 0.2 A Suffix -55 to 125_C D Suffix -40 to 85_C Symbol V+ = 15 V, V- = -15 V VAL = 0.8 V, VAH = 2.4 Vf Tempb Typc Mind Maxd Mind Maxd Unit mA V Notes: a. Refer to PROCESS OPTION FLOWCHART. b. Room = 25_C, Full = as determined by the operating temperature suffix. c. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing. d. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum, is used in this data sheet. e. Guaranteed by design, not subject to production test. f. VIN = input voltage to perform proper function. g. When the analog signal exceeds the +13.5 V or -12 V, rDS(on) starts to rise until only leakage currents flow. r DS(on) MAX - r DS(on) MIN h. Dr + x 100% DS(on) r AVE DS(on) TYPICAL CHARACTERISTICS (25_C UNLESS NOTED) Input Leakage vs. Input Voltage 1 mA 100 mA 10 mA I S -Source Current I S -Source Current 1 mA 100 nA 10 nA Operating Range 1 nA 100 pA 10 pA 1 pA -50 -40 -30 -20 -10 V+ = V- = 0 V Off-Channel Leakage Currents vs. Input Voltage 1 mA 100 mA 10 mA 1 mA 100 nA 10 nA Operating Range 1 nA 100 pA 10 pA 1 pA -50 -40 -30 -20 -10 V+ = 15 V V- = -15 V 0 10 20 30 40 50 0 10 20 30 40 50 VS - Source Voltage (V) VS - Source Voltage (V) www.vishay.com S FaxBack 408-970-5600 5-4 Document Number: 70064 S-52433--Rev. F, 06-Sep-99 DG458/459 Vishay Siliconix TYPICAL CHARACTERISTICS (25_C UNLESS NOTED) Output Leakage vs. Off-Channel Overvoltage 1 nA V+ = 15 V V- = -15 V 100 pA I D - Drain Current r DS(on) Drain-Source On-Resistance ( W ) - 2000 rDS(on) vs. Input Voltage 1600 "5 V Supplies "10 V 800 "15 V 1200 10 pA 1 pA 400 "20 V 0 -20 0.1 pA -50 -40 -30 -20 -10 0 10 20 30 40 50 -15 -10 -5 0 5 10 15 20 25 VS - Source Voltage (V) VS - Source Voltage (V) 700 r DS(on) Drain-Source On-Resistance ( W ) - 600 500 400 rDS(on) vs. VD and Temperature 25 V+ = 15 V V- = -15 V 20 15 I S, I D - Leakage (pA) 10 5 0 -5 -10 -15 Leakage Current vs. VS, VD V+ = 15 V V- = -15 V IS(off) 25_C 85_C 0_C 125_C ID(off) 300 200 100 0 -10 -7.5 -5.0 -2.5 0 2.5 5.0 7.5 10 VD - Drain Voltage (V) ID(on) -55_C -20 -25 -15 -12 -9 -6 -3 0 3 6 9 12 15 VD or VS - Drain or Source Voltage (V) Leakage Currents vs. Temperature 10 V+ = 15 V V- = -15 V VS, VD = "10 V 240 Switching Times (tTRANS, tON, tOFF) vs. "VSUPPLIES ID(on) tTRANS 200 I S, I D (nA) 1 Time (ns) ID(off) IS(off) 0.10 160 tON(EN) 120 VIN = 2 V 80 tOFF(EN) 0.01 -55 -35 -15 5 25 45 65 85 105 125 Temperature (_C) 40 "5 "10 "15 "20 V+, V- Positive and Negative Supplies (V) www.vishay.com S FaxBack 408-970-5600 Document Number: 70064 S-52433--Rev. F, 06-Sep-99 5-5 DG458/459 Vishay Siliconix TYPICAL CHARACTERISTICS (25_C UNLESS NOTED) Switching Times vs. Temperature 280 240 200 Time (ns) 160 120 tOPEN 80 40 0 -55 -35 -15 5 25 45 65 85 105 125 Temperature (_C) -110 tOFF(EN) V+ = 15 V V- = -15 V tTRANS tON(EN) 0 V+ = 15 V V- = -15 V QINJ vs. VS -10 Charge Injection (pC) -20 -30 CL = 1 nF -40 -50 CL = 10 nF -60 -10 -5 0 VS - Source Voltage (V) 5 10 Off Isolation and XTALK vs. Frequency 3.0 V+ = 15 V V- = -15 V RL = 1 kW 2.5 Logic Input Switching Threshold vs. "VSUPPLIES -100 -90 V TH (V) 10 M (dB) 2.0 -80 Off Isolation -70 Crosstalk 1.5 1.0 -60 0.5 -50 10 k 100 k 1M 0 2.5 5 7.5 10 12.5 15 17.5 20 f - Frequency (Hz) V+, Supply (V) SCHEMATIC DIAGRAM (TYPICAL CHANNEL) V+ GND VREF D V- V+ A0 V- V+ AX V- V+ EN Level Shift Decode/ Drive S1 Sn V- FIGURE 1. www.vishay.com S FaxBack 408-970-5600 5-6 Document Number: 70064 S-52433--Rev. F, 06-Sep-99 DG458/459 Vishay Siliconix TEST CIRCUITS +15 V V+ IS(off) "VS A Sn D ID(off) A V- VD -15 V FIGURE 2. Analog Input Overvoltage +15 V +2.4 V EN A2 A1 A0 GND 50 W -15 V V- 1 MW 35 pF V+ Logic Input 3V 50% 0V #5 V VO Switch Output VO +5 V 90% tA S1b * "5 V DG458 S8b Db -5 V * = S1a - S8a, S2b - S7b, Da FIGURE 3. Transition Time +15 V V+ Logic Input 3V 0V +2.4 V EN S1 , S8 S2 - S7 +5 V A0 A1 A2 GND 50 W DG458 Db, D V- 1 kW 35 pF VO Switch Output VO 0V tOPEN 50% -15 V FIGURE 4. Break-Before-Make Time Document Number: 70064 S-52433--Rev. F, 06-Sep-99 www.vishay.com S FaxBack 408-970-5600 5-7 DG458/459 Vishay Siliconix TEST CIRCUITS +15 V V+ S1 EN A0 A1 A2 GND 50 W -15 V V- S2 - S8 +5 V Enable Input 3V 50% 0V VS DG458 D 1 kW VO 35 pF Switch Output VO 0V tON(EN) 90% tOFF(EN FIGURE 5. Enable Delay DETAILED DESCRIPTION The Vishay Siliconix DG458 and DG459 multiplexers are fully fault- and overvoltage-protected for continuous input voltages up to "35 V whether or not voltage is applied to the power supply pins (V+, V-). These multiplexers are built on a high-voltage junction-isolated silicon-gate CMOS process. Two n-channel and one p-channel MOSFETs are connected in series to form each channel (Figure 1). -35 V Overvoltage Q1 -35 V S D S Q2 D S Q3 D +35 V Overvoltage n-Channel MOSFET is Off n-Channel MOSFET is On G G G p-Channel MOSFET is Off Within the normal analog signal range ("10 V), the rDS(on) variation as a function of analog signal voltage is comparable to that of the classic parallel N-MOS and P-MOS switches. (a) Overvoltage with Multiplexer Power Off -15 V +15 V -15 V When the analog signal approaches or exceeds either supply rail, even for an on-channel, one of the three series MOSFETs gets cut-off, providing inherent protection against overvoltages even if the multiplexer power supply voltages are lost. This protection is good up to the breakdown voltage of the respective series MOSFETs. Under fault conditions only sub microamp leakage currents can flow in or out of the multiplexer. This not only provides protection for the multiplexer and succeeding circuitry, but it allows normal, undisturbed operation of all other channels. Additionally, in case of power loss to the multiplexer, the loading caused on the transducers and signal sources is insignificant, therefore redundant multiplexers can be used on critical applications such as telemetry and avionics. www.vishay.com S FaxBack 408-970-5600 -35 V Overvoltage Q1 Q2 Q3 +35 V Overvoltage n-Channel MOSFET is On -15 V p-Channel MOSFET is Off +15 V n-Channel MOSFET is Off (b) Overvoltage with Multiplexer Power On FIGURE 6. Overvoltage Protection Document Number: 70064 S-52433--Rev. F, 06-Sep-99 5-8 |
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