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LS7215 Datasheet(PDF) 4 Page - LSI Computer Systems |
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LS7215 Datasheet(HTML) 4 Page - LSI Computer Systems |
4 / 8 page ELECTRICAL CHARACTERISTICS (Voltages referenced to Vss) (Con’t) Characteristic SYMBOL VDD Unit Condition Min Max Min Max Min Max Switching Characteristics (See Fig. 3) 3.0 - 1.8 - 1.4 - 1.05 MHz RC Oscillator Frequency fosc 10.0 - 4.5 - 3.4 - 2.6 MHz - 18.0 - 8.0 - 4.0 - 3.0 MHz 3.0 - 2.6 - 2.0 - 1.52 MHz For prescale External Clock or fext 10.0 - 5.3 - 4.0 - 3.0 MHz factor S = 1 or 3000 Crystal Oscillator 18.0 - 5.9 - 4.6 - 3.5 MHz or 3600 Frequency 3.0 - 7.2 - 5.5 - 4.2 MHz S = 32768 fext 10.0 - 16.0 - 12.8 - 9.7 MHz or 18.0 - 15.9 - 12 - 9.1 MHz 32768 x 60 TRIG Set-Up Time t1 - 38 - 50 - 66 - ns - A, B Set-Up Time t2 - 0 - 0 - 0 - ns - 3.0 - 284 - 375 - 495 ns Clock to Out Delay t4 10.0 - 98 - 130 - 172 ns CL = 50pF 18.0 - 87 - 115 - 152 ns 7215-062309-4 A 1 2 B TRIG 19 CLOCK/RC/XTLI 4 XTLO (LS7216) 5 6 PSCLS 1M 1M OSC MUX 3-STATE DECODER CLOCK LATCH EDGE DETECT MODE REG LATCH/TIMER PRESCALER 500k 8 CONTROL LOGIC BUF 9 OUT 500k 500k 500k WB7-WB0 500k (8) +V +V +V VDD VSS RCS/CLKS (LS7215) 7 RESET 500k +V -V LATCH 8 8 8 LOAD 20 3 8 11-18 ODOUT 10 5 |
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