INTEGRATED CIRCUITS DATA SHEET For a complete data sheet, please also download: • The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications • The IC06 74HC/HCT/HCU/HCMOS Logic Package Information • The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines 74HC/HCT123 Dual retriggerable monostable multivibrator with reset Product specification Supersedes data of September 1993 File under Integrated Circuits, IC06 1998 Jul 08
Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 74HC/HCT123 • Retriggerable for very long pulses up to 100% duty factor and early reset. The basic output pulse width is essentially determined by the values of the external timing components REXT and CEXT. For pulse widths, when CEXT < 10 000 pF, see Fig.9.
Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 74HC/HCT123 ORDERING INFORMATION PACKAGE TYPE NUMBER NAME DESCRIPTION VERSION 74HC123N; 74HCT123N DIP16 plastic dual in-line package; 16 leads (300 mil); long body SOT38-1 74HC123D; 74HCT123D SO16 plastic small outline package; 16 leads; body width 3.9 mm SOT109-1 plastic shrink small outline package; 16 leads; body width 5.
Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 74HC/HCT123 FUNCTION TABLE INPUTS nRD L nA X OUTPUTS nB nQ nQ X L H H(1) H(1) X H X L(1) X X L L(1) H L ↑ H ↓ H ↑ L H 1. If the monostable was triggered before this condition was established, the pulse will continue as programmed. (1) For minimum noise generation, it is recommended to ground pins 6 (2CEXT) and 14 (1CEXT) externally to pin 8 (GND). Fig.5 Logic diagram.
Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 74HC/HCT123 Fig.6 Timing component connections. DC CHARACTERISTICS FOR 74HC For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 74HC/HCT123 AC CHARACTERISTICS FOR 74HC GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (°C) TEST CONDITIONS 74HC SYMBOL PARAMETER −40 to +85 −40 to +125 min. typ. max. min. max. min. max. +25 UNIT V CC (V) WAVEFORMS/ NOTES tPLH propagation delay nRD, nA, nB to nQ 83 30 24 255 51 43 320 64 54 385 77 65 ns 2.0 4.5 6.
Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 74HC/HCT123 DC CHARACTERISTICS FOR 74HCT For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”. Output capability: standard (except for nREXT / CEXT) ICC category: MSI Note to HCT types The value of additional quiescent supply current (∆ICC) for a unit load of 1 is given in the family specifications.
Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 74HC/HCT123 AC CHARACTERISTICS FOR 74HCT GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (°C) TEST CONDITIONS 74HCT SYMBOL PARAMETER −40 to +85 +25 −40 to +125 min. typ. max. min. max. min. UNIT V CC (V) WAVEFORMS/ NOTES max. tPHL propagation delay nRD, nA, nB to nQ 30 51 64 77 ns 4.5 CEXT = 0 pF; REXT = 5 kΩ tPLH propagation delay nRD, nA, nB to nQ 28 51 64 77 ns 4.
Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 74HC/HCT123 Notes to AC characteristics 1. For other REXT and CEXT combinations see Fig.9. If CEXT > 10 nF, the next formula is valid: tW = K × REXT × CEXT (typ.) where: tW = output pulse width in ns; REXT = external resistor in kΩ; CEXT = external capacitor in pF; K = constant = 0.55 for VCC = 5.0 V and 0.48 for VCC = 2.0 V.
Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 74HC/HCT123 AC WAVEFORMS Fig.7 Fig.9 Fig.8 Output pulse control using retrigger pulse; nRD = HIGH. Typical output pulse width as a function of the external capacitor values at VCC = 5.0 V and Tamb = 25 °C. 1998 Jul 08 Output pulse control using reset input in nRD; nA = LOW. Fig.10 HCT typical “k” factor as a function of VCC; CX = 10 nF; RX = 10 kΩ to 100 kΩ.
Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 74HC/HCT123 APPLICATION INFORMATION Power-up considerations When the monostable is powered-up it may produce an output pulse, with a pulse width defined by the values of RX and CX, this output pulse can be eliminated using the circuit shown in Fig.11. Fig.11 Power-up output pulse elimination circuit.
Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 74HC/HCT123 PACKAGE OUTLINES DIP16: plastic dual in-line package; 16 leads (300 mil); long body SOT38-1 ME seating plane D A2 A A1 L c e Z b1 w M (e 1) b MH 9 16 pin 1 index E 1 8 0 5 10 mm scale DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT A max. A1 min. A2 max. b b1 c D (1) E (1) e e1 L ME MH w Z (1) max. mm 4.7 0.51 3.7 1.40 1.
Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 74HC/HCT123 SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1 D E A X c y HE v M A Z 16 9 Q A2 A (A 3) A1 pin 1 index θ Lp 1 L 8 e 0 detail X w M bp 2.5 5 mm scale DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT A max. A1 A2 A3 bp c D (1) E (1) e HE L Lp Q v w y Z (1) mm 1.75 0.25 0.10 1.45 1.25 0.25 0.
Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 74HC/HCT123 SSOP16: plastic shrink small outline package; 16 leads; body width 5.3 mm D SOT338-1 E A X c y HE v M A Z 9 16 Q A2 A (A 3) A1 pin 1 index θ Lp L 8 1 detail X w M bp e 0 2.5 5 mm scale DIMENSIONS (mm are the original dimensions) UNIT A max. A1 A2 A3 bp c D (1) E (1) e HE L Lp Q v w y Z (1) θ mm 2.0 0.21 0.05 1.80 1.65 0.25 0.38 0.25 0.20 0.09 6.
Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 74HC/HCT123 TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm SOT403-1 E D A X c y HE v M A Z 9 16 Q (A 3) A2 A A1 pin 1 index θ Lp L 1 8 e detail X w M bp 0 2.5 5 mm scale DIMENSIONS (mm are the original dimensions) UNIT A max. A1 A2 A3 bp c D (1) E (2) e HE L Lp Q v w y Z (1) θ mm 1.10 0.15 0.05 0.95 0.80 0.25 0.30 0.19 0.
Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 74HC/HCT123 Several techniques exist for reflowing; for example, thermal conduction by heated belt. Dwell times vary between 50 and 300 seconds depending on heating method. SOLDERING Introduction There is no soldering method that is ideal for all IC packages. Wave soldering is often preferred when through-hole and surface mounted components are mixed on one printed-circuit board.
Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 74HC/HCT123 REPAIRING SOLDERED JOINTS Fix the component by first soldering two diagonally- opposite end leads. Use only a low voltage soldering iron (less than 24 V) applied to the flat part of the lead. Contact time must be limited to 10 seconds at up to 300 °C. When using a dedicated tool, all other leads can be soldered in one operation within 2 to 5 seconds between 270 and 320 °C.
