Standard Products Datasheet PCS5035 Quintet Precision Current Sources Built-In Comparators Radiation Tolerant www.aeroflex.com/pcs October 22, 2014 FEATURES Radiation Performance - Total dose > 100 krad(Si), Dose rate = 50 - 300 rads(Si)/s - ELDRS > 15 krads(Si), Dose rate = .01 rads(Si)/s Five high precision 80µA current source outputs/comparator inputs Monolithic construction Designed for thermistor temperature monitoring Enable control Long term stability Low drift Zener protected input DC supply voltage +5V Low supply current High impedance sensor interface Designed for aerospace and high reliability space applications 0.63"Sq x 0.125"Ht, 18 lead, hermetic flat package Aeroflex Plainview’s Radiation Hardness Assurance Plan is DLA Certified to MIL-PRF-38534, Appendix G. GENERAL DESCRIPTION The Aeroflex Plainview PCS5035 contains "Five Monolithic" precision current sources designed for thermistor current monitor and resistive sensor applications. The precision current source (80µA ±2µA)/Comparator inputs are compared to an external reference of 0VDC to 3VDC. A precision internal 2.0VDC reference is provided if an external reference is not available. See Figure 1. The comparator outputs of two (2) PCS5035 can be wired or’ed to provide 10 sensors inputs. Current source output/comparator inputs of two or more units can be tied together to provide more sensor current. A logic "high" of 3.4VDC maximum on the enable pin turns on the current source/comparators. Any unused current source output/comparator inputs can be left open circuit without affecting other I/O’s. SCD5035 Rev J 1,18 I = 80µA IOUT/VIN_1 2 VCC 10K + 17 12 VOUT_1 Comp_Ref I = 80µA IOUT/VIN_2 3 10K + 16 VOUT_2 15 VOUT_3 14 VOUT_4 I = 80µA IOUT/VIN_3 4 10K + I = 80µA IOUT/VIN_4 5 10K + I = 80µA IOUT/VIN_5 6 10K + 13 - Precision 2 Volt Reference VOUT_5 8 Enable 11 BGOUT 9,10 7 GND CASE GND FIGURE 1 – Schematic Diagram SCD5035 Rev J 10/22/2014 2 Aeroflex Plainview ABSOLUTE MAXIMUM RATINGS Parameter Range Units Operating Case Temperature -55 to +125 °C Storage Case Temperature -65 to +150 °C +7.0 V Power Supply Voltages (VCC) NOTICE: Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress rating only; functional operation beyond the "Operation Conditions" is not recommended and extended exposure beyond the "Operation Conditions" may affect device reliability. ELECTRICAL PERFORMANCE CHARACTERISTICS (TC = -55°C TO +125°C, +VCC = +5.0VDC ±5% -- UNLESS OTHERWISE SPECIFIED ) Parameter Source Current 1-5 1/ Comparator In Voltage Symbol Condition Min Max Unit IO 0 VIN 3.1V, VEN = VENH 77 83 µA IOFF 0 VIN 3.1V, VEN = VENL - 150 nA VIN IOUT = 80µA 0 3.1 V Comparator Ref In Voltage 2/ VREF - 3.1 V Comparator Ref In Current IREF - 1200 nA Enable Input Voltage Low VENL - 0.8 V Enable Input Voltage High VENH 2.4 - V Comparator Hysteresis 2/ - - 30 mV Output Voltage Low 1-5 1/ VOL - 0.4 V Output Voltage High 1-5 1/ VOH 4.4 - V VINOC 4.0 4.6 V TA = 25°C 1.990 2.010 V TC = -55°C, +125°C 1.980 2.020 V -75 75 mV -5 5 mV 8 12 K CL = 37pF , VEN = VENH, VREF = 1V, VIN = 2V, ISINK = 0, See Figure 2 3/ 0.2 10 µS 80 150 nS CL = 37pF, VIN = 0V, VREF = 1V, ISINK = 0, See Figure 2 3/ 100 1500 nS 500 3000 nS CL = 68pF, ISINK = 0, See Figure 2 3/ 100 250 nS 100 250 nS - 4.0 7.0 mA mA Input Open Circuit Voltage Band Gap Regulator Output Voltage BG Regulator Voltage Max Change 1/ 2/ Band Gap Load Regulation VBG BG VBG IBG Internal Output Pull-Up Resistor RINT Comparator Pulse Delay Low to High tDLH Comparator Pulse Delay High to Low tDHL Enable Delay to Vout ISINK 2.0mA IBG = 0 to 2mA tEDVLH tEDVHL Enable Delay to Iout tEDILH tEDIHL Supply current Disabled Enabled 1/ ICCD ICCE Notes: 1/ The active element that makes up this device has been tested to 200 krad(Si) to assure RHA designator level ’R’ (100 krad(Si)) of Method 1019, condition A of MIL-STD-883 at +25°C for these parameters. The element will be re-tested after design or process changes that can affect RHA response of these elements. 2/ Guaranteed by design, but not tested. 3/ Test fixture node capacitance plus 10pF scope capacitance. SCD5035 Rev J 10/22/2014 3 Aeroflex Plainview VOUT_1-5 VIN_1-5 t DHL t DLH Comparator Pulse Delay VOUT_1-5 ENABLE t EDVLH t EDVHL ENABLE Delay to VOUT_1-5 ENABLE IOUT_1-5 t EDILH t EDIHL ENABLE Delay to IOUT_1-5 FIGURE 2 – TIMING DIAGRAMS SCD5035 Rev J 10/22/2014 4 Aeroflex Plainview One primary application for the Aeroflex PCS5035, as shown in Figure 3 below, would be to monitor the temperature of different electronic bay areas in a Satellite, and report when any bay area has exceeded a maximum temperature limit. Thermistors with defined temperature characteristics are used as the sensors, and by providing a constant stable current to the external Thermistor (Temp T1 to Temp T5), an accurate analog voltage of a specified temperature trip point can be established. The comparator voltage reference input can be tailored to set the trip point for the characteristic of the particular thermistor sensor used. The on-board precision 2V reference can be used directly for voltages of 2 volts or less, or can be scaled with an external operational amplifier to provide a voltage between 2 volts and the maximum input of 3.1V. Various temperature trip points could be accomplished by using thermistors with different temperature characteristics. +5V I = 80µA VIN_1 IOUT_1 Temp T1 + - 10K VOUT_1 1 CL VIN_2 VOUT_2 VIN_3 VOUT_3 VIN_4 VOUT_4 VIN_5 IOUT_5 Temp T5 + - V_OUT1 T1 t V_OUT5 10K VOUT_5 5 CL +2V T5 t FIGURE 3 – Typical Temperature Sensing Application SCD5035 Rev J 10/22/2014 5 Aeroflex Plainview Another application for the Aeroflex PCS5035 device is to provide precision excitation sources and threshold detection for five temperature sensors. The temperature sensors are typically thermistors, but can also be RTDs or silicon diodes. Since these devices have negative temperature coefficients, the device resistance is inversely related to the temperature. A typical application is shown below. The PCS5035 contains five independent current sources, internally trimmed to 80 uA (+ 2µA) each. The PCS5035 also contains an internal precision bandgap voltage reference, set to 2.000 Volts (+ 0.010Volts). Five complete temperature monitor circuits can be obtained by connecting external thermistors as shown below. The threshold is reached when the temperature of the thermistor produces a resistance of exactly 25K (2.00V/80uA). If the temperature is low, the sensor voltage is greater than 2.000 Volts and the comparator output is high; when the temperature is high, the comparator output goes low. The comparator output configurations are open-collector, with internal 10K pullup resistors. This allows the comparator outputs to be wire-ORed. To set the thresholds at other temperatures, several options are available: Other thermistor types may be selected; shunt resistors may be used to adjust the sensor response; an external reference voltage may be used. +5V I = 80µA VIN_1 Sensor 1 IOUT_1 + t° - 10K VOUT_1 1 VIN_2 VOUT_2 VIN_3 VOUT_3 VIN_4 VOUT_4 VIN_5 Sensor 5 IOUT_5 + t° - 10K 5 VOUT_5 Internal Precision Bandgap Reference Temperature Threshold Monitor with Internal Bandgap Reference Voltage SCD5035 Rev J 10/22/2014 6 Aeroflex Plainview When more "Temperature Sensing" inputs are needed two PCS5035 hybrids can be used as shown below in Figure 4. The outputs of the two PCS5035 hybrids can be wired together to produce a wired “OR” function. Each bank of 5 inputs can then be separately controlled by its associated Enable input. One application of this multiple input arrangement could be circuit board temperature monitoring using the temperature characteristics of a PN (diode) junction. With a constant current to the diode sensor the diode voltage can be a calibrated function of temperature. Diodes can be placed on or near vital electronic components to monitor their case temperatures so that they can be shut down before a catastrophic temperature failure occurs. VIN_1 + - 10K COMP_REF Trip 1/6 10K 1 6 + VIN_6 - VIN_2 VIN_7 VIN_3 VIN_8 VIN_4 VIN_5 + VREF - 10K COMP_REF Trip 5/10 5 VIN_9 10K + 10 - EN1 VIN_10 VREF EN2 PCS5035-S PCS5035-S FIGURE 4 – Wired "OR" Application SCD5035 Rev J 10/22/2014 7 Aeroflex Plainview SIGNAL DESCRIPTION Pin # Signal Names Description 1, 18 VCC +5VDC ±5% 2-6 IOUT/VIN_1 thru IOUT/VIN_5 Current Source Outputs / Comparator Inputs 1 thru 5 ENABLE Turns all Current/Comparators "ON" or "OFF" GND Logic and Power Return. VOUT_1 thru VOUT_5 Voltage Outputs corresponding to Current source outputs 1 thru 5, includes 10K pull-ups 11 BG Reg OUT Band Gap Regulator Precision Output 2.0VDC 7 CASE_GND Case Ground 12 COMPREF External voltage to all 5 comparator inputs 8 9, 10 17 - 13 PIN # vs FUNCTION TABLE Pin # SCD5035 Rev J 10/22/2014 Function Pin # Function 1 VCC 10 GND 2 IOUT/VIN_1 11 BG Reg OUT 3 IOUT/VIN_2 12 COMPREF 4 IOUT/VIN_3 13 VOUT_5 5 IOUT/VIN_4 14 VOUT_4 6 IOUT/VIN_5 15 VOUT_3 7 CASE_GND 16 VOUT_2 8 ENABLE 17 VOUT_1 9 GND 18 VCC 8 Aeroflex Plainview ORDERING INFORMATION Model DLA SMD # Screening Package PCS5035-7 - Commercial Flow, +25°C testing only PCS5035-S - Military Temperature, -55ºC to +125ºC Screened in accordance with the individual Test Methods of MIL-STD-883 for Space Applications. PCS5035-201-1S PCS5035-201-2S 5962-0923401KXC 5962-0923401KXA In accordance with DLA SMD PCS5035-901-1S PCS5035-901-2S 5962R0923401KXC 5962R0923401KXA In accordance with DLA Certified RHA Program Plan to RHA Level "R", 100 krad(Si) 18 lead Flat Package PACKAGE CONFIGURATION OUTLINE EXPORT CONTROL: This product is controlled for export under the International Traffic in Arms Regulations (ITAR). A license from the U.S. Government is required prior to the export of this product from the United States. www.aeroflex.com/HiRel [email protected] Datasheet Definitions: Advanced Preliminary Datasheet Product in Development Shipping Non-Flight Prototypes Shipping QML and Reduced HiRel Aeroflex Plainview, Inc. reserves the right to make changes to any products and services described herein at any time without notice. Consult Aeroflex or an authorized sales representative to verify that the information in this data sheet is current before using this product. Aeroflex does not assume any responsibility or liability arising out of the application or use of any product or service described herein, except as expressly agreed to in writing by Aeroflex; nor does the purchase, lease, or use of a product or service from Aeroflex convey a license under any patent rights, copyrights, trademark rights, or any other of the intellectual rights of Aeroflex or of third parties. SCD5035 Rev J 10/22/2014 9 Our passion for performance is defined by three attributes. Solution-Minded Performance-Driven Customer-Focused