74HC221 PHILIPS

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Technical content

Product specification Supersedes data of April 1988 File under Integrated Circuits, IC06 December 1990 INTEGRATED CIRCUITS 74HC/HCT221 Dual non-retriggerable monostable multivibrator with reset 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

Philips Semiconductors Product specification Dual non-retriggerable monostable multivibrator with reset 74HC/HCT221

FEATURES

  • Pulse width variance is typically less than± 5%
  • Pin-out identical to “123”
  • Overriding reset terminates output pulse
  • nB inputs have hysteresis for improved noise immunity
  • Output capability: standard (except for nREXT /CEXT )
  • ICC category: MSI GENERAL DESCRIPTION The 74HC/HCT221 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A. The 74HC/HCT221 are dual non-retriggerable monostable multivibrators. Each multivibrator features an active LOW-going edge input (n A) and an active HIGH-going edge input (nB), either of which can be used as an enable input. Pulse triggering occurs at a particular voltage level and is not directly related to the transition time of the input pulse. Schmitt-trigger input circuitry for the nB inputs allow jitter-free triggering from inputs with slow transition rates, providing the circuit with excellent noise immunity. Once triggered, the outputs (nQ, n Q) are independent of further transitions of nA and nB inputs and are a function of the timing components. The output pulses can be terminated by the overriding active LOW reset inputs R D ). Input pulses may be of any duration relative to the output pulse. Pulse width stability is achieved through internal compensation and is virtually independent of VCC and temperature. In most applications pulse stability will only be limited by the accuracy of the external timing components. The output pulse width is defined by the following relationship: t W =C EXT R EXT In2 tW = 0.7CEXT R EXT Pin assignments for the “221” are identical to those of the “123” so that the “221” can be substituted for those products in systems not using the retrigger by merely changing the value of R EXT and/or CEXT . QUICK REFERENCE DATA GND = 0 V; Tamb =2 5°C; tr =tf= 6 ns Notes 1. C PD is used to determine the dynamic power dissipation (PD inµW): PD =C PD × VCC 2 × fi+∑ (CL × VCC 2 × fo)+ 0.33× C EXT × VCC 2 × fo + D × 28 × VCC where: fi= input frequency in MHz; fo = output frequency in MHz ∑ (CL × VCC 2 × fo) = sum of outputs C EXT = timing capacitance in pF; CL = output load capacitance in pF VCC = supply voltage in V; D = duty factor in % 2. For HC the condition is VI= GND to VCC For HCT the condition is VI= GND to VCC − 1.5 V SYMBOL PARAMETER CONDITIONS TYPICAL UNIT HC HCT propagation delay C L = 15 pF; VCC =5 V ; R EXT =5 kΩ ; CEXT = 0 pFtPHL nA, nB, nR D to nQ, nQ 2 93 2n s tPLH nA, nB, nR D to nQ, nQ 3 53 6n s C I input capacitance 3.5 3.5 pF C PD power dissipation capacitance per package notes 1 and 2 90 96 pF

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. SYMBOL NAME AND FUNCTION 1, 9 1 A, 2A trigger inputs (negative-edge triggered) 2, 10 1B, 2B trigger inputs (positive-edge triggered) 3, 11 1 R D , 2R D direct reset inputs (active LOW) 4, 12 1 Q, 2Q outputs (active LOW)

72 R EXT /CEXT external resistor/capacitor connection

8 GND ground (0 V)

13, 5 1Q, 2Q outputs (active HIGH) 14, 6 1C EXT , 2CEXT external capacitor connection 15 1R EXT /CEXT external resistor/capacitor connection

16 V CC positive supply voltage

Fig.1 Pin configuration. Fig.2 Logic symbol. Fig.3 IEC logic symbol.

Philips Semiconductors Product specification Dual non-retriggerable monostable multivibrator with reset 74HC/HCT221 Fig.4 Functional diagram. FUNCTION TABLE 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. If the monostable was triggered before this condition was established the pulse will continue as programmed. 3. For this combination the reset input must be LOW and the following sequence must be used: pin 1 (or 9) must be set HIGH or pin 2 (or 10) set LOW; then pin 1 (or 9) must be LOW and pin 2 (or 10) set HIGH. Now the reset input goes from LOW-to-HIGH and the device will be triggered. INPUTS OUTPUTS n R D nAn B n Qn Q LXX LH XH X L (2) H (2) XX L L (2) H (2) HL ↑ H ↓ H ↑ LH (3) (3)

Philips Semiconductors Product specification Dual non-retriggerable monostable multivibrator with reset 74HC/HCT221 Note It is recommended to ground pins 6 (2CEXT ) and 14 (1CEXT ) externally to pin 8 (GND). Fig.5 Logic diagram. 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 SYMBOL PARAMETER Tamb (°C) UNIT TEST CONDITIONS 74HC VCC (V) WAVEFORMS +25 −40 to+85 −40 to+125 min typ max. min max. min. max. tPLH propagation delay (trigger) nA, nB to nQ 220 275 330 ns 2.0 4.5 6.0 C EXT = 0 pF; R EXT =5 kΩ ; Fig.10 tPLH propagation delay (trigger) nR D to nQ 245 305 370 ns 2.0 4.5 6.0 C EXT = 0 pF; R EXT =5 kΩ ; Fig.10 tPHL propagation delay (trigger) nA, nB to nQ 180 225 270 ns 2.0 4.5 6.0 C EXT = 0 pF; R EXT =5 kΩ ; Fig.10 tPHL propagation delay (trigger) nR D to nQ 195 245 295 ns 2.0 4.5 6,0 C EXT = 0 pF; R EXT =5 kΩ ; Fig.10 tPLH propagation delay (reset) nR D to nQ 200 250 300 ns 2.0 4.5 6.0 C EXT = 0 pF; R EXT =5 kΩ ; Fig.11 tPLH propagation delay (reset) nR D to nQ 180 225 270 ns 2.0 4.5 6.0 C EXT = 0 pF; R EXT =5 kΩ ; Fig.11 tTHL / tTLH output transition time 19 110 ns 2.0 4.5 6.0 Fig.10 t W trigger pulse width nA = LOW 110 ns 2.0 4.5 6.0 Fig.7 t W trigger pulse width nB = HIGH 115 135 ns 2.0 4.5 6.0 Fig.7 t W trigger pulse width nR D = LOW 110 ns 2.0 4.5 6.0 Fig.8 t W output pulse width nQ = LOW nQ = HIGH 630 700 770 602 798 595 805 µs 5.0 C EXT = 100 nF; R EXT = 10 kΩ ; Fig.10

Philips Semiconductors Product specification Dual non-retriggerable monostable multivibrator with reset 74HC/HCT221 tW output pulse width nQ or nQ 140 −− ns 2.0 4.5 6.0 C EXT = 28 nF; R EXT =2 kΩ ; Fig.10 tW output pulse width nQ or nQ 1.5 −− µ s 2.0 4.5 6.0 C EXT = 1 nF; R EXT =2 kΩ ; Fig.10 tW output pulse width nQ or nQ 7 −− µ s 2.0 4.5 6.0 C EXT = 1 nF; R EXT = 10 kΩ ; Fig.10 tW pulse width match between circuits in the package ± 2 −− % 4.5 to 5.5 C EXT = 1000 pF; R EXT = 10 kΩ trem removal time nR D to nA or nB 100 125 150 ns 2.0 4.5 6.0 Fig.9 R EXT external timing resistor 10 1000 1000 kΩ 2.0 5.0 Fig.12 Fig.13 C EXT external timing capacitor no limits pF 2.0 5.0 Fig.12 Fig.13 SYMBOL PARAMETER Tamb (°C) UNIT TEST CONDITIONS 74HC VCC (V) WAVEFORMS +25 −40 to+85 −40 to+125 min typ max. min max. min. max.

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 (ΔICC ) for a unit load of 1 is given in the family specifications. To determineΔICC per input, multiply this value by the unit load coefficient shown in the table below. INPUT UNIT LOAD COEFFICIENT nB 0.30 nA 0.50 nR D 0.50

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 SYMBOL PARAMETER Tamb (°C) UNIT TEST CONDITIONS 74HCT VCC (V) WAVEFORMS +25 −40 to+85 −40 to+125 min typ max min max. min. max. tPLH propagation delay (trigger) nA, nR D to nQ 30 50 63 75 ns 4.5 C EXT = 0 pF; R EXT =5 kΩ ; Fig.10 tPLH propagation delay (trigger) nB to nQ 24 42 53 63 ns 4.5 C EXT = 0 pF; R EXT =5 kΩ ; Fig.10 tPHL propagation delay (trigger) nA to nQ 26 44 55 66 ns 4.5 C EXT = 0 pF; R EXT =5 kΩ ; Fig.10 tPHL propagation delay (trigger) nB to nQ 21 35 44 53 ns 4.5 C EXT = 0 pF; R EXT =5 kΩ ; Fig.10 tPHL propagation delay (trigger) nR D to nQ 26 43 54 65 ns 4.5 C EXT = 0 pF; R EXT =5 kΩ ; Fig.10 tPHL propagation delay (reset) nR D to nQ 26 43 54 65 ns 4.5 C EXT = 0 pF; R EXT =5 kΩ ; Fig.11 tPLH propagation delay (reset) nR D to nQ 31 51 64 77 ns 4.5 C EXT = 0 pF; R EXT =5 kΩ ; Fig.11 tTHL / tTLH output transition time 7 15 19 22 ns 4.5 Fig.10 tW trigger pulse width nA = LOW 20 13 25 30 ns 4.5 Fig.10 tW trigger pulse width nB = HIGH 20 13 25 30 ns 4.5 Fig.10 tW pulse width nR D = LOW 22 13 28 33 ns 4.5 Fig.8 tW output pulse width nQ = LOW nQ = HIGH 630 700 770 602 798 595 805 µs 5.0 C EXT = 100 nF; R EXT = 10 kΩ ; Fig.10 tW trigger pulse width nQ or nQ 140 −− ns 4.5 C EXT = 28 pF; R EXT =2 kΩ ; Fig.10 tW trigger pulse width nQ or nQ 1.5 −− µ s 4.5 C EXT = 1 nF; R EXT = 2 kΩ ; Fig.10

Philips Semiconductors Product specification Dual non-retriggerable monostable multivibrator with reset 74HC/HCT221 tW trigger pulse width nQ or nQ 7 −− µ s 4.5 C EXT = 1 nF; R EXT = 10 kΩ ; Fig.10 trem removal time nR D to nA or nB 20 12 25 30 ns 4.5 Fig.9 R EXT external timing resistor 2 1000 −− kΩ 5.0 Fig.13 C EXT external timing capacitor no limits pF 5.0 Fig.13 SYMBOL PARAMETER Tamb (°C) UNIT TEST CONDITIONS 74HCT VCC (V) WAVEFORMS +25 −40 to+85 −40 to+125 min typ max min max. min. max.

Philips Semiconductors Product specification Dual non-retriggerable monostable multivibrator with reset 74HC/HCT221 AC WAVEFORMS Fig.7 Output pulse control; nR D = HIGH. Fig.8 Output pulse control using reset input nR D ; nA = LOW. Fig.9 Waveforms showing the removal times; nR D to nA or nB. (1) HC : V M =V M = 50%; VI= GND to VCC . HCT : VM =V M = 1.3 V; VI= GND to 3 V. 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. (1) HC : V M =V M = 50%; VI= GND to VCC . HCT : VM =V M = 1.3 V; VI= GND to 3 V. Fig.11 Waveforms showing the reset to nQ and nQ output propagation delays. (1) HC : V M =V M = 50%; VI= GND to VCC . HCT : VM =V M = 1.3 V; VI= GND to 3 V.

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 = 0.1µF; RX =1 0K Ω ; VCC =5V . Fig.16 k factor as a function of supply voltage; R X =1 0K Ω ;Tamb =2 5°C. Power-down consideration A large capacitor (CX) may cause problems when powering-down the monostable due to the energy stored in this capacitor. When a system containing this device is powered-down or a rapid decrease of V CC to zero occurs, the monostable may substain damage, due to the capacitor discharging through the input protection diodes. To avoid this possibility, use a damping diode (D preferably a germanium or Schottky type diode able to withstand large current surges and connect as shown in Fig.17. Fig.17 Power-down protection circuit. PACKAGE OUTLINES See “74HC/HCT/HCU/HCMOS Logic Package Outlines”.