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| Standard ICs Dual precision monostable multivibrator BU4538B The BU4538B is a monostable multivibrator that can be reset and retriggered. It is triggered from either edge of an input pulse. As the output pulse width and accuracy are determined by the external timing constants Cx and Rx, a wide range of accurate output pulse widths is available. Linear CMOS technology makes it possible to control the output pulse width with greater accuracy. Determination is made based on tWOUT = Rx * Cx throughout the entire power supply voltage range, eliminating the necessity for other coefficients. *Features dissipation. 1) Low power 2) Wide range of operating power supply voltages. 3) High input impedance. 4) High fan-out. 5) Direct drive of 2 L-TTL inputs and 1 LS-TTL input. *Block diagram T1A 1 BA CD Q T1 T2 Q 16 VDD 15 T1B 14 T2B 13 CDB 12 AB 11 BB 10 QB 9 QB T2A 2 CDA 3 AA 4 BA 5 BA CD Q T1 T2 Q QA QA 6 7 VSS 8 *Logic circuit diagram VDD VDD RX 2 (14) T2 CX 1 (15) T1 4 (12) A B CD 5 (11) 3 (13) Q Q S Reset Latch R Control Vref1 Enable Vref2 Enable SQ Output Latch 7 (9) RQ 6 (10) *Truth table INPUT A B H L H L X X CD H H H H L L H L L H H Q OUTPUT Q 1 Standard ICs BU4538B *Absolute maximum ratings (Ta = 25C, VSS = 0V) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Input voltage Symbol VDD Pd Topr Tstg VIN Limits - 0.3 ~ + 18 1000 (DIP) - 40 ~ + 85 - 55 ~ + 150 - 0.3 ~ VDD + 0.3 Unit V mW C C V *Electrical characteristics otherwise noted, Ta = 25C, VSS = 0V) DC characteristics (unless Parameter Symbol Min. 3.5 Input high level voltage VIH 7.0 11.0 -- Input low level voltage VIL -- -- Input high level current Input low level current IIH IIL -- -- 4.95 Output high level voltage VOH 9.95 14.95 -- Output low level voltage VOL -- -- - 0.16 Output high level current IOH - 0.4 - 1.2 0.44 Output low level current IOL 1.1 3.0 -- Static current dissipation IDD -- -- Typ. -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- Max. -- -- -- 1.5 3.0 4.0 0.3 - 0.3 -- -- -- 0.05 0.05 0.05 -- -- -- -- -- -- 20 40 80 A mA mA V V A A V V Unit VDD (V) 5 10 15 5 10 15 15 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 VI = VDD or GND VOH = 4.6V VOH = 9.5V VOH = 13.5V VOL = 0.4V VOL = 0.5V VOL = 1.5V IO = 0mA IO = 0mA VIH = 15V VIL = 0V -- -- Conditions 2 Standard ICs Switching characteristics (unless otherwise noted, Ta = 25C, CL = 50pF, VSS = 0V) Parameter Symbol Min. -- Output rise time tTLH -- -- -- Output fall time tTHL -- -- -- Propagation delay time A, B to Q, Q tPLH tPHL -- -- -- Propagation delay time CD to Q, Q tPLH tPHL -- -- -- Minimum input pulse width tWIN -- -- 185 Output pulse width 1 tWOUT1 185 185 8.8 Output pulse width 2 tWOUT2 8.8 8.8 -- Minimum retrigger time Input capacitance trr -- -- CIN -- Typ. 100 50 40 100 50 40 300 150 100 250 125 95 50 30 25 200 200 200 9.4 9.4 9.4 0 0 0 5 Max. -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 215 215 215 10.0 10.0 10.0 -- -- -- -- pF ns ms s ns ns ns ns ns Unit Conditions BU4538B VDD (V) 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 -- -- -- -- -- -- CX = 2000pF, RX = 100k CX = 0.1F, RX = 100k -- -- *Recommended operating conditions Parameter External timing resistance External timing capacitance Symbol RX CX Min. 5 Typ. -- No Limit Max. 1000 Unit k pF Conditions -- -- 3 Standard ICs BU4538B *Timing chart A B CD Q Q tW tW t1 t2 t3 tW t1, t2, t3 < tW *Measurement circuits VDD RX CX VDD T2 T1 A Q B CD P. G. P. G. P. G. VSS Q CL CL Fig. 1 (a) Switching time 20ns 90% 50% A 20ns B 90% 50% 10% 20ns 90% 50% tPLH tWOUT tPLH tTHL 90% 50% Q tPHL Q 50% 50% 90% 50% 10% 50% tPHL 50% 50% 10% tTLH 10% tTHL tPHL 10% tTLH 90% 50% tPHL trr 20ns 10% 20ns 50% 20ns CD tWOUT Fig. 1 (b) Switching time measurement waveforms 4 Standard ICs BU4538B *Electrical characteristic curve 1200 POWER DISSIPATION: Pd (mW) 1000 800 600 400 200 0 0 25 50 75 100 125 150 AMBIENT TEMPERATURE: Ta (C) Fig. 2 Power dissipation vs. Ta *External dimensions (Units: mm) 19.4 0.3 16 9 6.5 0.3 1 0.51Min. 3.2 0.2 4.25 0.3 8 7.62 0.3 0.1 2.54 0.5 0.1 0 ~ 15 DIP16 5 |
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