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BU4042B

Rohm
Part Number BU4042B
Manufacturer Rohm
Description Quad D latch
Published Apr 17, 2005
Detailed Description Standard ICs Quad D latch BU4042B The BU4042B is a four-circuit D latch with a common clock line and separate data inpu...
Datasheet PDF File BU4042B PDF File

BU4042B
BU4042B

Overview
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 • 1) Low power dissipation.
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 Q Q Q1 3 CL D D1 4 Q Q 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 Q Q 12 Q3 D4 (14) CLOCK (5) POLARITY (6) LATCH 4 POLARITY 6 CL D 11 Q3 (1) Q4 (15) Q4 D2 7 Q Q 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 SS •Absolute maximum ratings (Ta = 25°C, V Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Input voltage Symbol VDD Pd Topr Tstg VIN = 0V) Limits – 0.
3 ~ + 18 1000 (DIP) – 40 ~ + 85 – 55 ~ + 150 – 0.
3 ~ VDD + 0.
3 Unit V mW °C °C V Electrical characteristics • DC characteristics (unless otherwise noted, Ta = 25°C, V 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 — ...


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