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74LV423DB Arkusz danych(PDF) 8 Page - NXP Semiconductors

Numer części 74LV423DB
Szczegółowy opis  Dual retriggerable monostable multivibrator with reset
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Producent  PHILIPS [NXP Semiconductors]
Strona internetowa  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74LV423DB Arkusz danych(HTML) 8 Page - NXP Semiconductors

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Philips Semiconductors
Preliminary specification
74LV423
Dual retriggerable monostable multivibrator
with reset
1997 Feb 04
8
AC CHARACTERISTICS (Continued)
GND = 0V; tr = tf ≤ 2.5ns; CL = 50pF; RL = 1KΩ
CONDITION
LIMITS
SYMBOL
PARAMETER
WAVEFORM
CONDITION
–40 to +85
°C
–40 to +125
°C
UNIT
VCC(V)
MIN
TYP1
MAX
MIN
MAX
1.2
20
1000
External timing
2.0
5
1000
REXT
External timing
resistor
Figure 6
2.7
5
1000
k
resistor
3.0 to 3.6
2
1000
4.5 to 5.5
2
1000
3
2.0
CEXT
External timing
Figure 63
2.7
No limits
pF
CEXT
g
capacitor
Figure 63
3.0 to 3.6
No limits
F
4.5 to 5.5
NOTES:
1. Unless otherwise stated, all typical values are at Tamb = 25°C.
2. Typical value measured at VCC = 3.3V.
3. Typical value measured at VCC = 5.0V.
4. For other REXT and CEXT combinations see Figure 6.
if CEXT > 10 nF, the next formula is valid:
tW
= K x REXT x CEXT (typ.)
where, tW
= output pulse width in ns;
REXT = external resistor in kΩ; CEXT = external capacitor in pF;
K
= constant = 0.45 for VCC = 5.0V and 0.48 for VCC = 2.0V.
The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is approximately 7 pF.
5. The time to retrigger the monostable multivibrator depends on the values of REXT and CEXT.
The output pulse width will only be extended when the time between the active-going edges of the
trigger pulses meets the minimum retrigger time.
If CEXT > 10 pF, the next formula (at VCC = 5.0V) for the set-up time of a retrigger pulse is valid:
trt
= 30 + 0.19R x C-9 + 13 x R1.05 (typ.)
where, trt
= retrigger time in ns;
CEXT = external capacitor in pF;
REXT = external resistor in kΩ.
The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is approximately 7 pF.
6. When the device is powered up, initiate the device via a reset pulse, when CEXT < 50pF.
AC WAVEFORMS
VM = 1.5V at VCC w 2.7V; VM = 0.5 VCC at VCC t 2.7V.
VOL and VOH are the typical output voltage drop that occur
with the output load.
tW
tW
trt
tW
tW
tW
nB INPUT
nA INPUT
nQ OUTPUT
SV00139
Figure 2. Output pulse control using retrigger pulse;
nRD = HIGH.
tW
tW
nB INPUT
nRD INPUT
nQ OUTPUT
SV00164
Figure 3. Output pulse control using reset input nRD;
nA = LOW.


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