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HD74AC123A Dataheets PDF



Part Number HD74AC123A
Manufacturers Hitachi Semiconductor
Logo Hitachi Semiconductor
Description Dual Retriggerable Resettable Multivibrator
Datasheet HD74AC123A DatasheetHD74AC123A Datasheet (PDF)

HD74AC123A Dual Retriggerable Resettable Multivibrator Description Each half of the HD74AC123A features retriggerable capability, complementary dc level triggering and overriding Direct Clear. When a circuit is in the quasi-stable (delay) state, another trigger applied to the inputs (per the Truth Table) will cause the delay period to start again, without disturbing the outputs. By repeating this process, the output pulse period (Q High, Q Low) can be made as long as desired. Alternatively, a d.

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HD74AC123A Dual Retriggerable Resettable Multivibrator Description Each half of the HD74AC123A features retriggerable capability, complementary dc level triggering and overriding Direct Clear. When a circuit is in the quasi-stable (delay) state, another trigger applied to the inputs (per the Truth Table) will cause the delay period to start again, without disturbing the outputs. By repeating this process, the output pulse period (Q High, Q Low) can be made as long as desired. Alternatively, a delay period can be terminated at any time by a Low signal on C D, which also inhibits triggering. An internal connection from C D to the input gate makes it possible to trigger the circuit by a positive-going signal on C D, as shown in the Truth Table. For timing capacitor values greater than 1000 pF, the output pulse width is defined as follows. Where tw is in ns, RX is in k and C tw = RXCX X is in pF. Feature • Outputs Source/Sink 24 mA HD74AC123A Pin Arrangement A1 1 B1 2 CD1 3 Q1 4 Q2 5 CX2 6 RX2CX2 7 GND 8 (Top view) 16 VCC 15 RX1CX1 14 CX1 13 Q1 12 Q2 11 CD2 10 B2 9 A2 Logic Symbol 7 6 (15) (14) RXCX CX Q 9(1) A 10(2) B Q CD 12(4) 5(13) 11 (3) VCC = Pin16 GND = Pin8 2 HD74AC123A Pin Names A1, A 2 B 1, B 2 C D1, CD2 Q1, Q2 Q1, Q 2 Trigger Inputs (Active Falling Edge) Trigger Inputs (Active Rising Edge) Direct Clear Inputs (Active Low) Positive Pulse Outputs Negative Pulse Outputs Triggering Truth Table Inputs A X B X L H H L L H : L : X : : : H High Voltage Level Low Voltage Level Immaterial Low-to-High Transition High-to-Low Transition CD L X H X H Response No trigger No trigger Trigger No trigger Trigger Trigger DC Characteristics (unless otherwise specified) Item Maximum quiescent supply current Maximum quiescent supply current Symbol I CC I CC Max 80 8.0 Unit µA µA Condition VIN = VCC or ground, VCC = 5.5 V, Ta = Worst case VIN = VCC or ground, VCC = 5.5 V, Ta = 25°C 3 HD74AC123A AC Characteristics: HD74AC123A Ta = +25°C CL = 50 pF Item Propagation delay A or B to Q Propagation delay A or B to Q Propagation delay CDn to Q Propagation delay CDn to Q Note: t PHL t PLH t PHL Symbol t PLH VCC (V)*1 Min 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Typ — — — — — — — — Max 19.0 15.0 19.0 15.0 15.0 12.0 15.0 12.0 Ta = –40°C to +85°C CL = 50 pF Min 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Max 22.0 17.0 22.0 17.0 18.0 13.5 18.0 13.5 ns ns ns Unit ns Condition Cext = 0 pF Rest = 5 kΩ 1. Voltage Range 3.3 is 3.3 V ± 0.3 V Voltage Range 5.0 is 5.0 V ± 0.5 V AC Operating Requirements: HD74AC123A Ta = +25°C CL = 50 pF Item Pulse width A or B or CDn Recovery time CDn to A or B Note: t rec Symbol tw VCC (V)*1 3.3 5.0 3.3 5.0 Typ — — — — Ta = –40 to +85°C CL = 50 pF Guaranteed Minimum 5.0 4.5 2.0 2.0 7.0 5.0 2.0 2.0 ns Unit ns Condition Cext = 0 pF Rext = 5 kΩ 1. Voltage Range 3.3 is 3.3 V ± 0.3 V Voltage Range 5.0 is 5.0 V ± 0.5 V 4 HD74AC123A Ta = +25°C CL = 50 pF Item Output pulse width Symbol TWQ VCC (V)*1 3.3 5.0 Minimum output pulse width Note: TWQ(min) 3.3 5.0 Min — 0.90 190 160 Typ — — — — Max — 1.10 350 300 Ta = –40°C to +85°C CL = 50 pF Min — 0.85 170 140 Max — 1.15 380 330 ns Unit ms Condition Cext = 0.1 µF Rext = 10 kΩ Cext = 28 pF Rext = 2 kΩ 1. Voltage Range 3.3 is 3.3 V ± 0.3 V Voltage Range 5.0 is 5.0 V ± 0.5 V Cext and Rext should be connected as close to the IC terminals as possible, in order to prevent malfunction. 5 19.20 20.00 Max 16 9 7.40 Max 6.30 Unit: mm 1 1.3 1.11 Max 8 0.51 Min 2.54 Min 5.06 Max 7.62 2.54 ± 0.25 0.48 ± 0.10 0.25 – 0.05 0° – 15° Hitachi Code JEDEC EIAJ Weight (reference value) + 0.13 DP-16 Conforms Conforms 1.07 g Unit: mm 10.06 10.5 Max 16 9 5.5 1 *0.22 ± 0.05 0.20 ± 0.04 8 0.80 Max 2.20 Max 0.20 7.80 + – 0.30 1.15 0° – 8° 0.70 ± 0.20 1.27 *0.42 ± 0.08 0.40 ± 0.06 0.12 M Hitachi Code JEDEC EIAJ Weight (reference value) FP-16DA — Conforms 0.24 g *Dimension including the plating thickness Base material dimension 0.10 ± 0.10 0.15 Unit: mm 9.9 10.3 Max 16 9 3.95 1 1.27 0.635 Max 8 0.11 0.14 + – 0.04 1.75 Max *0.22 ± 0.03 0.20 ± 0.03 0.10 6.10 + – 0.30 1.08 0° – 8° 0.67 0.60 + – 0.20 *0.42 ± 0.08 0.40 ± 0.06 0.15 0.25 M *Dimension including the plating thickness Base material dimension Hitachi Code JEDEC EIAJ Weight (reference value) FP-16DN Conforms Conforms 0.15 g Cautions 1. Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s patent, copyright, trademark, or other intellectual property rights for information contained in this document. Hitachi bears no responsibility for problems that may arise with third party’s rights, including intellectual property rights, in connection with use of the information contained in this document. 2. Products and product specifications may be subject to change without notice. Confirm that you have received the latest product standards or specifications before final design, purchase or use. 3. Hitachi makes every attempt to ensure that its products are.


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