NTE1507 Integrated Circuit 10–Step Adjustable Analog Level Detector Description: The NTE1507 is an integrated circuit in a 16–Lead DIP type package consisting of ten comparators and a reference voltage network to detect the level of a signal at the analog input. Output Q1 is switched to a low logic level at a typical input voltage of 200mV with Threshold Adjust open and the cascade input grounded. After each 200mV increment, the next output is switched to a low logic level. All outputs are at low logic levels at a typical input voltage of 2000mV. The threshold–adjust pin allows the user to decrease the input voltage steps from 200mV to 100mV increments by connecting an external resistor from Threshold Adjust to GND. This level detector is directly cascadable requiring only two external resistors to establish a zero–reference level voltage for the cascade input. The maximum number of devices that can be cascaded is determined by the threshold level and the maximum input voltages. If the cascade feature is not utilized, the cascade input must be grounded for proper operation. The NTE1507 is especially designed to detect and indicate analog signal levels and may be used in various industrial, consumer, or automotive applications such as low–precision meters, warning–signal indicators, A/D converters, feedback regulators, pulse shapers, delay elements, and for automatic range switching. The open–emitter outputs are capable of sourcing currents up to 25mA and may be operated at voltages up to 35V. The power outputs are suitable for driving a variety of display elements such as vacuum flourescent displays, LED’s, or filament lamps. The outputs may also drive digital integrated logic such as CMOS or other high–level logic. Features: D 10 Comparators to Digitize Analog Input Signals D Cascade Feature Allows Stacking Output Display Strings D Threshold Intervals Adjustable from 200mV to 100mV D Open–Emitter Outputs Capable of Sourcing up to 25mA and Withstanding up to 35V D Supply Voltage Range of 10V to 35V (VCC2) Absolute Maximum Ratings: (TA = 0° to +70°C unless otherwise specified) Supply Voltage VCC1 (Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V VCC2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V Input Voltage Analog Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8V Cascade Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8V Output Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to VCC2 On–State Output Current (Each Output) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –30mA Continuous Total Dissipation (TA ≤ +25°C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2075mW Derate Linearly Above 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.6mW/°C Operating Ambient Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +70°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C Lead Temperature (During Soldering, 1/16” (1.6mm) from case, 10sec), TL . . . . . . . . . . . . . +260°C Note 1. Voltage values are with respect to network ground terminal. Recommended Operating Conditions: Parameter Symbol Supply Voltage Test Conditions Min Typ Max Unit VCC1 10.8 12.0 13.2 V VCC2 10.0 25.0 35.0 V 1 – 8 V Cascade Input Voltage (When not at GND) Output Current IO – – 25 mA Operating Ambient Temperature TA 0 – 70 °C Electrical Characteristics: (TA = 0° to +70°C, Pin5 at GND, Pin6 Open, Note 2 unless otherwise specified) Parameter Symbol Positive–Going Threshold Voltage at Input A Switching Q1 VT+ Min Typ Max Unit 125 200 275 mV Switching Q2 325 400 475 mV Switching Q3 525 600 675 mV Switching Q4 725 800 875 mV Switching Q5 925 1000 1075 mV Switching Q6 1125 1200 1275 mV Switching Q7 1325 1400 1475 mV Switching Q8 1525 1600 1675 mV Switching Q9 1725 1800 1875 mV Switching Q10 1925 2000 2075 mV – 10 – mV IOH = –10mA VCC2–1.3 VCC2–0.8 – V IOH = –25mA VCC2–1.5 VCC2–0.9 – V Input Hysteresis High–Level (On–State) Output Voltage Test Conditions TA = +25°C VT+ – VT– VOH Low–Level (Off–State) Output Current IOL VCC2 = 35V – 0.5 200 µA Input Current Analog Input IL VI = 2V – 260 400 µA – 1000 1700 µA – 15 25 mA – 9 15 mA – 15 27 mA – 1 200 µA Cascade Input Supply Current from VCC1 All Outputs High ICC VCC1 = 12V, No Load All Outputs Low Supply Current from VCC2 All Outputs High All Outputs Low VCC1 = 12V, VCC2 = 35V, No Load Note 2. All typical values are at VCC1 = 12V, VCC2 = 25V, and TA = +25°C. Pin Connection Diagram Q9 1 16 Q8 Q10 2 15 Q7 VCC 1 3 14 Q6 Analog Input 4 13 VCC 2 Cascade Input 5 12 Q5 Threshold Adjust 6 11 Q4 GND 7 10 Q3 Q1 8 9 16 Q2 9 .260 (6.6) Max 1 8 .785 (19.9) Max .300 (7.62) .200 (5.08) Max .245 (6.22) Min .100 (2.54) .700 (17.7)