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HD74LS123P Dataheets PDF



Part Number HD74LS123P
Manufacturers Renesas
Logo Renesas
Description Dual Retriggerable Monostable Multivibrators
Datasheet HD74LS123P DatasheetHD74LS123P Datasheet (PDF)

HD74LS123 Dual Retriggerable Monostable Multivibrators (with Clear) REJ03D0429–0200 Rev.2.00 Feb.18.2005 This d-c triggered multivibrator features output pulse width control by three method. The basic pulse time is programmed by selection of external resistance and capacitance values. Once triggered, the basic pulse width may be extended by retriggering the gated low-level -active (A) or high-level active (B) inputs, or be reduced by use of the overriding clear. Figure 1 illustrates pulse cont.

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HD74LS123 Dual Retriggerable Monostable Multivibrators (with Clear) REJ03D0429–0200 Rev.2.00 Feb.18.2005 This d-c triggered multivibrator features output pulse width control by three method. The basic pulse time is programmed by selection of external resistance and capacitance values. Once triggered, the basic pulse width may be extended by retriggering the gated low-level -active (A) or high-level active (B) inputs, or be reduced by use of the overriding clear. Figure 1 illustrates pulse control by retriggering and early clear. This device is provided enough Schmitt hysteresis to ensure jitter-free triggering from the B input with transition rates as slow as 0.1 mV/ns. Features • Ordering Information Part Name Package Type Package Code (Previous Code) Package Abbreviation HD74LS123P DILP-16 pin PRDP0016AE-B P (DP-16FV) HD74LS123FPEL SOP-16 pin (JEITA) PRSP0016DH-B (FP-16DAV) FP PRSP0016DG-A HD74LS123RPEL SOP-16 pin (JEDEC) (FP-16DNV) RP Note: Please consult the sales office for the above package availability. Taping Abbreviation (Quantity) — EL (2,000 pcs/reel) EL (2,500 pcs/reel) A = "L" Clear = "H" B Q A = "L" B Clear Q Retrigger Pulse "H" "L" tw + tPLH "H" tw "L" Output without retrigger "H" "L" "H" "L" Output without clear "H" "L" Figure 1 Typical Input / Output Pulse Rev.2.00, Feb.18.2005, page 1 of 8 HD74LS123 Pin Arrangement 1A 1 1B 2 1CLR 3 1Q 4 2Q 5 2Cext 6 2Rext/Cext 7 GND 8 CLR QQ QQ CLR 16 VCC 15 1Rext/Cext 14 1Cext 13 1Q 12 2Q 11 2CLR 10 2B 9 2A (Top view) Function Table Inputs Clear A1 L X X H X X H L H ↓ ↑ L Notes: H; high level, L; low level, X; irrelevant ↑; transition from low to high level ↓; transition from high to low level ; one high-level pulse ; one low-level pulse Block Diagram (1/2) B2 X X L ↑ H H External parameter Outputs Q Q L H L H L H A B Clear Cext Rext VCC /Cext QQ QQ Clear Rev.2.00, Feb.18.2005, page 2 of 8 HD74LS123 Absolute Maximum Ratings Item Symbol Ratings Unit Supply voltage VCC 7 V Input voltage VIN 7 V Power dissipation Storage temperature PT Tstg 400 mW –65 to +150 °C Note: Voltage value, unless otherwise noted, are with respect to network ground terminal. Recommended Operating Conditions Supply voltage Item Output current Operating temperature Input pulse width “H” A, B “L” CLR “L” External timing resistance External capacitance Wiring capacitance at Rext/Cext terminal Symbol VCC IOH IOL Topr tw (in) Rext Cext Min 4.75 — — –20 40 40 40 5 — Typ Max Unit 5.00 5.25 V — –400 µA — 8 mA 25 75 °C — — ns — — ns — — ns — 260 kΩ Non restriction — 50 pF Electrical Characteristics (Ta = –20 to +75 °C) Item Symbol min. typ.* max. Unit Condition Input voltage Output voltage Input current Short-circuit output current VIH 2.0 — — V VIL — — 0.8 V VOH 2.7 — — V VCC = 4.75 V, VIH = 2 V, VIL = 0.8 V, IOH = –400 µA VOL — — — 0.4 — 0.5 V IOL = 4 mA IOL = 8.


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