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. •1)Features Low power dissipation. 2) Wide range of operating power supply voltages. 3) High input impedance. •Block diagram Q4 Q1 •Logic circuit diagram 1 2 16 VDD CL D 3 D1 (4) LATCH 1 (2) Q1 (3) Q1 LATCH 2 (10) Q2 LATCH 3 (11) Q3 LATCH 4 (1) 15 Q4 Q Q Q1 4) High fan-out. 5) Direct drive of 2 L-TTL inputs and 1LS-TTL input. D2 (7) 14 D4 (9) Q2 CL D D1 CLOCK 4 5 Q Q CL D 13 D3 D3 (13) 12 Q3 (12) Q3 Q Q POLARITY D4 (14) 11 Q3 6 CL D D2 7 VSS 8 Q Q CLOCK (5) 10 Q2 9 Q4 (15) Q4 POLARITY (6) Q2 •Truth table CLOCK POLARITY Q L L D H L LATCH H H D L H LATCH 1 Standard ICs BU4042B •Absolute maximum ratings (Ta = 25°C, V SS Parameter = 0V) Symbol Limits Power supply voltage VDD – 0.3 ~ + 18 V Power dissipation Pd 1000 (DIP) mW Operating temperature Topr – 40 ~ + 85 °C Storage temperature Tstg – 55 ~ + 150 °C – 0.3 ~ VDD + 0.3 V Input voltage VIN characteristics •DCElectrical characteristics (unless otherwise noted, Ta = 25°C, V Parameter Input high level voltage (DATA) Symbol VIH Input high level voltage ( CLOCK POLARITY ) Input low level voltage (DATA) VIH VIL SS = 0V) Min. Typ. Max. 3.5 — — 7.0 — — 11.0 — — 15 3.5 — — 5 7.0 — — 11.25 — — — — 1.5 — — 3.0 — — 4.0 — — 1.5 VIL — — 3.0 — — 3.75 Input high level current IIH — — Input low level current IIL Input low level voltage ( CLOCK POLARITY ) Output high level voltage Output low level voltage Output high level current Output low level current Static current dissipation 2 Unit VOH VOL IOH IOL IDD Unit VDD (V) V 10 Conditions 5 V — 10 — 15 5 V 10 — 15 5 V 10 0.3 µA 15 VIH = 15V µA 15 VIL = 0V — — – 0.3 4.95 — — 15 5 V 9.95 — — 14.95 — — 15 — — 0.05 5 — — 0.05 — — 0.05 – 0.16 — — – 0.4 — — — V 10 10 IO = 0mA IO = 0mA 15 mA 5 VOH = 4.6V 10 VOH = 9.5V – 1.2 — — 15 VOH = 13.5V 0.44 — — 5 VOL = 0.4V 1.1 — — 10 VOL = 0.5V VOL = 1.5V mA 3.0 — — 15 — — 4.0 5 — — 8.0 — — 16.0 µA 10 15 VI = VDD or GND Standard ICs BU4042B Switching characteristics (unless otherwise noted, Ta = 25°C, CL = 50pF, VSS = 0V) Parameter Symbol Output rise time tTLH Output fall time tTHL Propagation delay time D→Q, Q tPLH tPHL Propagation delay time CLOCK→Q, Q tPLH tPHL Minimum clock pulse width tWH tWL Hold time tH Setup time tSU Input capacitance CIN •Measurement circuits Min. Typ. Max. Unit — 180 — — 90 — — 65 — — 100 — — 50 — — 40 — 15 — 220 — 5 — 90 — — 70 — 15 — 220 — 5 — 90 — — 70 — — 150 — — 50 — — 40 — 15 — 50 — 5 — 25 — — 20 — — 50 — — 20 — — 5 — — 5 — VDD (V) Conditions Measurement circuit — Fig.1 — Fig.1 — Fig.1 — Fig.2 — Fig.2 — Fig.2 — Fig.2 — — 5 ns 10 15 5 ns 10 ns 10 ns 10 15 5 ns 10 ns 10 15 5 ns 10 15 pF — VDD 16 5 6 4 7 13 14 P.G. VDD CK POL D1 D2 D3 D4 VSS Q1 2 Q1 3 Q2 10 Q2 9 Q3 11 Q3 12 Q4 1 Q4 5 20ns 20ns D tPLH tPHL Q tTLH tTHL tPHL 8 Q VSS Note: Connect CL = 50pF to each of the output pins. Fig. 1 (a) Switching characteristics measurement circuit! tTHL tTLH Fig. 1 (b) Switching time measurement waveform! 3 Standard ICs BU4042B VDD 16 5 6 4 7 13 14 P.G.1 CK Q1 2 Q1 3 Q2 10 D1 Q2 9 D2 Q3 11 Q3 12 Q4 1 Q4 15 POL D3 D4 VSS P.G.2 20ns 20ns 90% 50% CK 10% 20ns D tWH 90% 50% tPHL 10% tWL 50% tSU th 8 HL tPLH VSS Q Note : Connect CL = 50pF to each of the output pins. Fig. 2 (a) Switching characteristics measurement circuit@ •Electrical characteristic curve POWER DISSIPATION : Pd (mW) 1200 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 9 1 8 0.51Min. 3.2 ± 0.2 4.25 ± 0.3 6.5 ± 0.3 16 7.62 0.3 ± 0.1 2.54 0.5 ± 0.1 DIP16 4 0° ~ 15° Fig. 2 (b) Switching time measurement waveform@