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74HCT4538D датащи(PDF) 2 Page - NXP Semiconductors

номер детали 74HCT4538D
подробное описание детали  Dual retriggerable precision monostable multivibrator
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74HCT4538D датащи(HTML) 2 Page - NXP Semiconductors

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September 1993
2
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 DESCRIPTION
The 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 DATA
GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns
Notes
1. CPD is used to determine the dynamic power dissipation (PD in µW):
PD = CPD × VCC2 × fi +∑ (CL × VCC2 × fo) +
+ 0.48 × CEXT × VCC2 × fo + D × 0.8 × VCC where:
fi = input frequency in MHz
fo = output frequency in MHz
∑ (CL × VCC2 × fo) = sum of outputs
CL = output load capacitance in pF
VCC = supply voltage in V
D = duty factor in %
CEXT = timing capacitance in pF
2. For HC the condition is VI = GND to VCC
For HCT the condition is VI = GND to VCC − 1.5 V
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package Information”.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
tPHL/ tPLH
propagation delay nA0,nA1 to nQ, nQCL = 15 pF; VCC = 5 V
27
30
ns
CI
input capacitance
3.5
3.5
pF
CPD
power dissipation capacitance per multivibrator
notes 1 and 2
136
138
pF


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