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LS7031 Scheda tecnica(PDF) 2 Page - LSI Computer Systems |
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LS7031 Scheda tecnica(HTML) 2 Page - LSI Computer Systems |
2 / 4 page POWER SUPPLIES +4.75V to +15V single power supply operation is obtained when VGG and VDD are tied together. Inputs and outputs are CMOS compatible and Minimum Input Noise Immunity of 25% of power supply is guaranteed except for Decade 1 and 2 inputs. (All inputs are TTL compatible at +4.75V to +5.25V operation.) With VGG at -12V, VDD at OV and Vss at +5V all inputs are TTL and CMOS compatible. All outputs are CMOS compatible and BCD and BLANK outputs also provide standard TTL compat- ibility. In addition, Overflow Output is low power TTL compatible. In either mode outputs swing between VDD and Vss. MAXIMUM RATINGS PARAMETER SYMBOL VALUE UNITS Storage Temperature Tstg -65 to +150 °C Operating Temperature TA -25 to +70 °C Voltage (any pin to Vss) Vmax -30 to +0.5 V PARAMETER SYMBOL MIN MAX UNITS Operating Supply Current Idds - 15 mA (fC = 7.5MHz) Input Noise Immunity Low and High Vni 25% - V (Vss-VDD) Input Voltage “0" Vil Vss - 20 Vss - 3.95 V Input Voltage “1" Vih Vss - 1.0 Vss V Output Voltage “0" Vol - +0.2 V Output Voltage “1" Voh Vss - 1.0 - V Output Voltage “0" (sinking 10µA) Vol - +0.5 V Output Current “1" Vss = 4.75V(Voh = Vss - 0.5V) - 0.05 - mA (Voh = Vss - 1V) - 0.25 - mA (Voh = Vss - 4V) - 0.90 - mA Vss = 10V (Voh = Vss - 2V) - 2.0 - mA (Voh = Vss - 3V) - 3.0 - mA Vss = 15V (Voh = Vss - 2V) - 3.0 - mA (Voh = Vss - 3V) - 4.5 - mA NOTE 1: Current Sink = Same as segment and strobe outputs. Current Source = N/A at Voh = Vss - 0.5V for Vss = +4.75V 35µA at Voh = Vss -1V for Vss = +4.75V 40% of segment and strobe outputs at all other specified operating points. NOTE 2: Limit segment current to 6mA maximum. The following inputs have internal pull down resistors to VDD with maximum sink current of 5µA at Vss input. Scan Reset B1/D1 B1/D2 Decimal B2/D1 B2/D2 Overflow B4/D1 B4/D2 B8/D1 B8/D2 DC ELECTRICAL CHARACTERISTICS (VDD = VGG= OV, Vss = +4.75 to +15V, -25°C ≤ TA ≤ +70°C unless otherwise specified.) D6, D7, D8 OF, BCD Blank (See Note 1) Segment and Strobe Outputs (See Note 2) BLANKING Leading zero blanking is employed. At start of each MSD to LSD scan, display is blanked until a non-zero digit or active decimal point is encountered. Display unblanks during LSD time and when- ever Overflow output is high. When Scan Reset is applied, display blanks to prevent display damage. Blanking information is available at Blank output. BCD DATA Data is available in multiplexed BCD format. BCD data can be readily demultiplexed using Digit Strobes as latch enable signals. { 7031-110201-2 TTL COMPATIBLE OUTPUTS: POWER SUPPLIES: Vss = +5V ± 5%, VDD = 0V, VGG = -12V ± 5% OUTPUT LEVELS: “1" Level ≥ Vss - 0.5V (sourcing 100µA) “0" Level ≤ 0.4V (sinking 1.6mA) “1" Level ≥ Vss -.5V (sourcing 40µA) “0" Level ≤ 0.4V (sinking .18mA) All other outputs as specified for single power supply, Vss = +15V operation. Inputs as specified for single power supply, Vss = +5V ± 5% operation. } } BLANK AND BCD DATA OUTPUTS OVERFLOW OUTPUT { EXTERNAL DECADE INPUTS SCAN OSCILLATOR CAPACITANCE TYPICAL OSCILLATOR FREQUENCY 4.75V 10V 15V 50pF 40.0 kHz 24.2kHz 22.2 kHz 100pF 22.2 kHz 14.8kHz 13.8 kHz 470pF 5.0 kHz 3.6kHz 3.5 kHz |
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