Hex Schmitt trigger BU44B / BU44BF / BU44BF The BU44B, BU44BF, and BU44BF are inverter-type Schmitt trigger circuits, with six circuits mounted on a single chip. These are ideal when enhanced noise immunity is required, and when wave form rectification circuits with slow rise or fall input times are involved. Features ) Low power dissipation. 2) Wide range of operating power supply voltage. 3) High input impedance. 4) High fan-out. ) Direct drive of 2 L-TTL inputs and LS-TTL input. Block diagram I 4 DD O 2 3 I6 I2 3 2 O6 O2 4 I I3 0 O O3 6 9 I4 SS O4 Absolute maximum ratings (SS = 0v, Ta = 2 C) Parameter Symbol Limits Unit Power supply voltage DD 0.3 ~ + Power dissipation Operating temperature Storage temperature Pd Topr Tstg 000 (DIP), 40 (SOP), 30 (SSOP) 40 ~ + ~ + 0 mw C C Input voltage IN 0.3 ~ DD + 0.3
BU44B / BU44BF / BU44BF Electrical characteristics DC characteristics (unless otherwise noted, SS = 0, Ta = 2 C) Parameter Symbol Min. Typ. Max. Unit DD () Conditions 3. Input high level voltage IH.0 0.0. Input low level voltage IL 3.0 0 4.0 Input high level current Input low level current Output high level voltage Output low level voltage Output high level current Output low level current Static current consumption Hysteresis voltage Measurement circuit IIH 0.3 µa IH = IIL 0.3 µa IL = 0 4.9 OH 9.9 0 IO = 0mA Fig. 4.9 0.0 OL 0.0 0 IO = 0mA 0.0 0.44 OH = 4.6 IOH. ma 0 OH = 9. 3.0 OH = 3. 0.44 OL = 0.4 IOL. ma 0 OL = 0. 3.0 OL =. IDD 2 µa 0 4 0. 0.6 H 0.2.0 0 Fig. 0.40. Switching characteristics (unless otherwise noted, Ta = 2 C, SS = 0, CL =0pF) Measurement circuit Parameter Symbol Min. Typ. Max. Unit DD () Conditions 00 Output rise time ttlh 0 ns 0 Fig.2 40 Output fall time Propagation delay time, "L" to "H" Propagation delay time, "H" to "L" tthl tplh tphl 00 0 ns 0 40 2 60 ns 0 0 2 60 ns 0 0 Fig.2 Fig.2 Fig.2 2
Measurememt circuits DD BU44B / BU44BF / BU44BF DD 20ns 20ns A Input P. G. CL tphl tplh GND GND Output tthl ttlh Fig. DC characteristics Fig.2 Switching characteristics Electrical characteristic curve 200 POWER DISSIPATION: Pd (mw) DIP4 000 00 600 SOP4 400 SSOP-B4 200 0 0 2 0 00 2 0 AMBIENT TEMPERATURE: Ta ( C) Fig.3 Power dissipation vs. Ta 3
BU44B / BU44BF / BU44BF External dimensions (Units: mm) BU44B 3.2 ± 0.2 4.2 ± 0.3 0.Min. 9.4 ± 0.3 4 6. ± 0.3 2.4 0. ± 0..62 0 ~ 0.3 ± 0. BU44BF 6.2 ± 0.3 4.4 ± 0.2. ± 0. 0.. ± 0.2 4.2 0.4 ± 0. 0.3Min. 0. ± 0. 0. DIP4 SOP4 BU44BF.0 ± 0.2 4 6.4 ± 0.3. ± 0. 0. 4.4 ± 0.2 0.6 0.22 ± 0. 0.3Min. 0. ± 0. SSOP-B4 0. 4
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