NTE2021 & NTE2022 Integrated Circuit 8–Digit/Segment Fluorescent Display Driver Description: The NTE2021 and NTE2022 consist of eight NPN Darlington output stages and the associated common–emitter input stages in an 18–Lead DIP type package. These devices are designed to interface between low–level digital logic and vacuum fluorescent displays. They are capable of driving the digits and/or segments of these displays and are designed to permit all outputs to be activated simultaneously. Pulldown resistors are incorporated into each output and no external components are required for most fluorescent displays. The NTE2020 is compatible with TTL, Schottky TTL, DTL and 5V CMOS. The NTE2021 device is intended for use with MOS (PMOS & CMOS) logic operating from supply voltages of 6V to 15V. Features: D Digit or Segment Drivers D Low Input Current D Integral Output Pull–Down Resistors D Low Power D Reliable Monolithic Construction D High Output Breakdown Voltage Absolute Maximum Ratings: (TA = +25°C, Note 1) Supply Voltage, VBB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85V Input Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V Output Current, IOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40mA Allowable Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1W Derate Above 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.0mW/°C Operating Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +85°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +150°C Note 1. Voltages are with reference to GND unless otherwise specified Recommended Operating Conditions: Parameter Symbol Supply Voltage VBB Input ON Voltage NTE2021 VIN NTE2022 Output ON Current IOUT Test Conditions Min Typ Max Unit 5 – 70 V 2.4 – 15 V 4.0 – 15 V – – –25 mA Note 2. Positive (negative) current is defined as going into (coming out of) the specified device pin. Electrical Characteristics: (TA = –20° to +85°C, VBB = 80V unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Output Leakage Current IOUT VIN = 400mV – – 15 µA Output OFF Voltage VOUT VIN = 400mV – – 1.0 V Output Pull–Down Current IOUT VOUT = VBB, Input Open 450 650 1100 µA Output ON Voltage NTE2021 VOUT VIN = 2.4V, IOUT = –25mA 77 78 – V VIN = 4.0V, IOUT = –25mA 77 78 – V VIN = 2.4V – 120 225 µA VIN = 5.0V – 375 650 µA VIN = 4.0V – 130 250 µA VIN = 15.0V – 675 1150 µA All Inputs Open – 10 100 µA NTE2021 All Inputs = 2.4V – 6.0 9.0 mA NTE2022 All Inputs = 4.0V – 6.0 9.0 mA NTE2022 Input ON Current NTE2021 IIN NTE2022 Supply Current NTE2021 & NTE2022 IBB Partial Schematic (One Driver) Pin Connection Diagram VBB 30k 27k Input RIN 15k Output RB 125k GND VEE RIN RB NTE2021 10kΩ 30kΩ NTE2022 20kΩ 20kΩ Input 1 1 18 Output 1 Input 2 2 17 Output 2 Input 3 3 16 Output 3 Input 4 4 15 Output 4 Input 5 5 14 Output 5 Input 6 6 13 Output 6 Input 7 7 12 Output 7 Input 8 8 11 Output 8 GND 9 10 VBB 9 1 10 18 .300 (7.62) .945 (24.0) .260 (6.6) .160 (4.06) Max .100 (2.54) .800 (20.32) .115 (2.92) Min