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/HCT221 Dual non-retriggerable monostable multivibrator with reset Product specification Supersedes data of April 1988 File under Integrated Circuits, IC06 December 1990
Philips Semiconductors Product specification Dual non-retriggerable monostable multivibrator with reset 74HC/HCT221 jitter-free triggering from inputs with slow transition rates, providing the circuit with excellent noise immunity. FEATURES • Pulse width variance is typically less than ± 5% Once triggered, the outputs (nQ, nQ) are independent of further transitions of nA and nB inputs and are a function of the timing components.
Philips Semiconductors Product specification Dual non-retriggerable monostable multivibrator with reset 74HC/HCT221 ORDERING INFORMATION See “74HC/HCT/HCU/HCMOS Logic Package Information”. PIN DESCRIPTION PIN NO.
Philips Semiconductors Product specification Dual non-retriggerable monostable multivibrator with reset 74HC/HCT221 FUNCTION TABLE INPUTS OUTPUTS nRD nA nB L X X nQ nQ L H (2) H (2) H (2) X H X L X X L L (2) H L ↑ H ↓ H ↑ L H (3) (3) Notes 1. H = HIGH voltage level L = LOW voltage level X = don’t care ↑ = LOW-to-HIGH level ↓ = HIGH-to-LOW level = one HIGH-level output pulse = one LOW-level output pulse 2.
Philips Semiconductors Product specification Dual non-retriggerable monostable multivibrator with reset 74HC/HCT221 Fig.5 Logic diagram. Note It is recommended to ground pins 6 (2CEXT) and 14 (1CEXT) externally to pin 8 (GND). Fig.6 Timing component connections.
Philips Semiconductors Product specification Dual non-retriggerable monostable multivibrator with reset 74HC/HCT221 DC CHARACTERISTICS FOR 74HC For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”. Output capability: standard (except for nREXT/CEXT) ICC category: MSI AC CHARACTERISTICS FOR 74HC GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (°C) TEST CONDITIONS 74HC SYMBOL PARAMETER +25 −40 to +85 min typ max. min max. −40 to +125 min. UNIT VCC WAVEFORMS (V) max.
Philips Semiconductors Product specification Dual non-retriggerable monostable multivibrator with reset 74HC/HCT221 Tamb (°C) TEST CONDITIONS 74HC SYMBOL PARAMETER +25 −40 to +85 min typ max. min max. −40 to +125 min. UNIT VCC WAVEFORMS (V) max. tW output pulse width nQ or nQ 140 − − ns 2.0 4.5 6.0 CEXT = 28 nF; REXT = 2 kΩ; Fig.10 tW output pulse width nQ or nQ 1.5 − − µs 2.0 4.5 6.0 CEXT = 1 nF; REXT = 2 kΩ; Fig.10 tW output pulse width nQ or nQ 7 − − µs 2.0 4.5 6.
Philips Semiconductors Product specification Dual non-retriggerable monostable multivibrator with reset 74HC/HCT221 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 non-retriggerable monostable multivibrator with reset 74HC/HCT221 AC CHARACTERISTICS FOR 74HCT GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (°C) TEST CONDITIONS 74HCT SYMBOL PARAMETER +25 −40 to +85 min typ max min max. −40 to +125 min. UNIT VCC (V) WAVEFORMS max. tPLH propagation delay (trigger) nA, nRD to nQ 30 50 63 75 ns 4.5 CEXT = 0 pF; REXT = 5 kΩ; Fig.10 tPLH propagation delay (trigger) nB to nQ 24 42 53 63 ns 4.
Philips Semiconductors Product specification Dual non-retriggerable monostable multivibrator with reset 74HC/HCT221 Tamb (°C) TEST CONDITIONS 74HCT SYMBOL PARAMETER +25 −40 to +85 min typ max min max. min. UNIT VCC (V) WAVEFORMS max. 7 − − µs 4.5 CEXT = 1 nF; REXT = 10 kΩ; Fig.10 12 25 30 ns 4.5 Fig.9 − kΩ 5.0 Fig.13 pF 5.0 Fig.
Philips Semiconductors Product specification Dual non-retriggerable monostable multivibrator with reset 74HC/HCT221 AC WAVEFORMS Fig.7 Output pulse control; nRD = HIGH. (1) HC : VM = VM = 50%; VI = GND to VCC. HCT : VM = VM = 1.3 V; VI = GND to 3 V. Fig.8 Fig.10 Waveforms showing the triggering of One Shot by input nA or input nB for one period (tW) and minimum pulse widths of the trigger inputs nA and nB. Output pulse control using reset input nRD; nA = LOW.
Philips Semiconductors Product specification Dual non-retriggerable monostable multivibrator with reset 74HC/HCT221 Fig.12 HC typical output pulse width as a function of timing capacitance (VCC = 2 V).
Philips Semiconductors Product specification Dual non-retriggerable monostable multivibrator with reset 74HC/HCT221 Fig.13 HC/HCT typical output pulse width as a function of timing capacitance (VCC = 4.5 V).
Philips Semiconductors Product specification Dual non-retriggerable monostable multivibrator with reset 74HC/HCT221 Fig.14 HC typical output pulse width as a function of timing capacitance (VCC = 6 V).
Philips Semiconductors Product specification Dual non-retriggerable monostable multivibrator with reset 74HC/HCT221 Fig.15 Typical output pulse width as a function of temperature; CX = 0.1 µF; RX = 10 KΩ; VCC = 5 V. Fig.16 k factor as a function of supply voltage; RX = 10 KΩ; Tamb = 25 °C. Power-down consideration PACKAGE OUTLINES A large capacitor (CX) may cause problems when powering-down the monostable due to the energy stored in this capacitor.
