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| 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 = +25C, Note 1) Supply Voltage, VBB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85V Input Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V Output Current, IOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40mA Allowable Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1W Derate Above 25C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.0mW/C Operating Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -20 to +85C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to +150C Note 1. Voltages are with reference to GND unless otherwise specified Recommended Operating Conditions: Parameter Supply Voltage Input ON Voltage NTE2021 NTE2022 Output ON Current IOUT Symbol VBB VIN 2.4 4.0 - - - - 15 15 -25 V V mA Test Conditions Min 5 Typ - Max 70 Unit V Note 2. Positive (negative) current is defined as going into (coming out of) the specified device pin. Electrical Characteristics: (TA = -20 to +85C, VBB = 80V unless otherwise specified) Parameter Output Leakage Current Output OFF Voltage Output Pull-Down Current Output ON Voltage NTE2021 NTE2022 Input ON Current NTE2021 NTE2022 Supply Current NTE2021 & NTE2022 NTE2021 NTE2022 IBB All Inputs Open All Inputs = 2.4V All Inputs = 4.0V - - - 10 6.0 6.0 100 9.0 9.0 IIN VIN = 2.4V VIN = 5.0V VIN = 4.0V VIN = 15.0V - - - - 120 375 130 675 225 650 250 1150 Symbol IOUT VOUT IOUT VOUT VIN = 2.4V, IOUT = -25mA VIN = 4.0V, IOUT = -25mA 77 77 78 78 - - V V A A A A A mA mA Test Conditions VIN = 400mV VIN = 400mV VOUT = VBB, Input Open Min - - 450 Typ - - 650 Max 15 1.0 1100 Unit A V A Partial Schematic (One Driver) Pin Connection Diagram VBB 30k Input 1 Input 2 Input 3 1 2 3 4 5 6 7 8 9 18 Output 1 17 Output 2 16 Output 3 15 Output 4 14 Output 5 13 Output 6 12 Output 7 11 Output 8 10 VBB 27k Input 4 Input 5 15k Output Input RIN Input 6 Input 7 Input 8 RB GND 125k VEE GND RIN NTE2021 NTE2022 10k 20k RB 30k 20k 9 1 10 18 .300 (7.62) .945 (24.0) .160 (4.06) Max .260 (6.6) .100 (2.54) .800 (20.32) .115 (2.92) Min |
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