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74HC/HCT4538; Dual retriggerable precision monostable multivibrator
Philips Semiconductors Product specification
Dual retriggerable precision monostable
multivibrator 74HC/HCT4538
FEATURES Separate reset inputs Triggering from leading or trailing edge Output capability: standard ICC category: MSI Power-on reset on-chip
GENERAL DESCRIPTIONThe 74HC/HCT4538 are high-speed Si-gate CMOS
devices and are pin compatible with “4538” of the “4000B”
series. They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT4538 are dual retriggerable-resettable
monostable multivibrators. Each multivibrator has an
active LOW trigger/retrigger input (nA0), an active HIGH
trigger/retrigger input (nA1) , an overriding active LOW
direct reset input (nRD), an output (nQ) and its complement
(nQ), and two pins (nCTC and nRCTC) for connecting the
external timing components Ct and Rt. Typical pulse width
variation over temperature range is± 0.2%.
The “4538” may be triggered by either the positive or the
negative edges of the input pulse. The duration and
accuracy of the output pulse are determined by the
external timing components Ct and Rt. The output pulse
width (T) is equal to 0.7×Rt×Ct. The linear design
techniques guarantee precise control of the output pulse
width.
A LOW level at nRD terminates the output pulse
immediately.
Schmitt-trigger action in the trigger inputs makes the circuit
highly tolerant to slower rise and fall times.
QUICK REFERENCE DATAGND = 0 V; Tamb = 25 °C; tr = tf = 6 ns
Notes CPD is used to determine the dynamic power dissipation (PDin μW): = CPD× VCC2×fi +∑ (CL× VCC2×fo)+ 0.48× CEXT× VCC2×fo+D× 0.8× VCC where: = input frequency in MHz = output frequency in MHz (CL× VCC2×fo) = sum of outputs= output load capacitance in pF
VCC= supply voltage in V= duty factor in %
CEXT= timing capacitance in pF For HC the condition is VI = GND to VCC
For HCT the condition is VI = GND to VCC− 1.5 V
ORDERING INFORMATIONSee “74HC/HCT/HCU/HCMOS Logic Package Information”.
Philips Semiconductors Product specification
Dual retriggerable precision monostable
multivibrator 74HC/HCT4538
PIN DESCRIPTION
Philips Semiconductors Product specification
Dual retriggerable precision monostable
multivibrator 74HC/HCT4538
FUNCTION TABLE
Notes H = HIGH voltage level = LOW voltage level= don’t care= LOW-to-HIGH transition= HIGH-to-LOW transition one HIGH level output pulse one LOW level output pulse
Philips Semiconductors Product specification
Philips Semiconductors Product specification
Dual retriggerable precision monostable
multivibrator 74HC/HCT4538
DC CHARACTERISTICS FOR 74HCFor the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
ICC category: MSI
AC CHARACTERISTICS FOR 74HCGND = 0 V; tr = tf = 6 ns; CL = 50 pF
Philips Semiconductors Product specification
Dual retriggerable precision monostable
multivibrator 74HC/HCT4538
NON-STANDARD DC CHARACTERISTICS FOR 74HCVoltages are referenced to GND (ground = 0 V)
Note This measurement can only be carried out after a trigger pulse is applied.
