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| Standard ICs Quad D latch BU4042B The BU4042B is a four-circuit D latch with a common clock line and separate data input terminals. When the polarity input is set to "H", input (D) is presented to output (Q) as is, as long as the clock input is rising, and when the clock input falls, output (Q) holds input (D) at that point. While the clock input is falling, output (Q) does not change even if input (D) changes. Also, if the polarity input is set to "L", input (D) is presented to output (Q) as is, as long as the clock input is at "L" level, and when the clock input goes to "H" level, latching takes place. *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 1LS-TTL input. *Block diagram Q4 1 16 VDD Q1 2 CL D QQ Q1 3 CL D D1 4 QQ 13 D3 14 D4 15 Q4 *Logic circuit diagram D1 (4) LATCH 1 (2) (3) Q1 Q1 D2 (7) LATCH 2 (10) Q2 (9) Q2 D3 (13) LATCH 3 (11) Q3 (12) Q3 CLOCK 5 CL D QQ 12 Q3 D4 (14) CLOCK (5) POLARITY (6) LATCH 4 POLARITY 6 CL D 11 Q3 (1) Q4 (15) Q4 D2 7 10 Q2 VSS 8 9 Q2 *Truth table CLOCK L H H L POLARITY L L H H Q D LATCH D LATCH 1 Standard ICs BU4042B *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 (DATA) VIH 7.0 11.0 Input high level voltage 3.5 VIH 7.0 11.25 -- Input low level voltage (DATA) VIL -- -- Input low level voltage -- VIL -- -- 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 1.5 3.0 3.75 0.3 - 0.3 -- -- -- 0.05 0.05 0.05 -- -- -- -- -- -- 4.0 8.0 16.0 A mA mA V V A A V V V V Unit VDD (V) 5 10 15 5 10 15 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 ( CLOCK ) POLARITY ( CLOCK ) POLARITY Input high level current Input low level current 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 DQ, Q tPLH tPHL -- -- -- Propagation delay time CLOCKQ, Q tPLH tPHL -- -- -- Minimum clock pulse width tWH tWL -- -- -- Hold time tH -- -- -- Setup time tSU -- -- Input capacitance CIN -- Typ. 180 90 65 100 50 40 220 90 70 220 90 70 150 50 40 50 25 20 50 20 5 5 Max. -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- pF ns ns ns ns ns ns ns Unit VDD (V) 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 -- -- -- -- -- -- -- -- -- Conditions BU4042B Measurement circuit Fig.1 Fig.1 Fig.1 Fig.2 Fig.2 Fig.2 Fig.2 -- *Measurement circuits 16 5 6 4 7 13 14 P.G. VDD CK POL D1 D2 D3 D4 VSS 8 VDD Q1 Q1 Q2 Q2 Q3 Q3 Q4 Q4 2 3 10 9 11 12 1 5 Q D 20ns 20ns tPLH tPHL tTLH tPHL Q tTHL VSS Note: Connect CL = 50pF to each of the output pins. tTHL tTLH Fig. 1 (a) Switching characteristics measurement circuit! Fig. 1 (b) Switching time measurement waveform! 3 Standard ICs VDD 16 5 6 4 7 13 14 P.G.1 P.G.2 8 BU4042B CK POL D1 D2 D3 D4 VSS HL VSS Q1 Q1 Q2 Q2 Q3 Q3 Q4 Q4 2 3 10 9 11 12 1 15 D tPHL 10% 20ns CK 10% 90% 50% 20ns 20ns 90% 50% tWH tWL 50% tSU th tPLH Q Note : Connect CL = 50pF to each of the output pins. Fig. 2 (a) Switching characteristics measurement circuit@ Fig. 2 (b) Switching time measurement waveform@ *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.3 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 4 |
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