74LV123D PHILIPS [NXP Semiconductors], 74LV123D Datasheet - Page 8

• Manufacturer Part Number: 74LV123D
• Description: Dual retriggerable monostable multivibrator with reset
• Manufacturer: PHILIPS [NXP Semiconductors]

1. Unless otherwise stated, all typical values are at T
2. Typical value measured at V
3. Typical value measured at V
4. For other R
5. The time to retrigger the monostable multivibrator depends on the values of R
6. When the device is powered up, initiate the device via a reset pulse, when C
Philips Semiconductors
AC CHARACTERISTICS (Continued)
GND = 0V; t
NOTES:
AC WAVEFORMS
V
V
load.
1998 Apr 28
SYMBOL
M
OH
nB INPUT
nA INPUT
nQ OUTPUT
Dual retriggerable monostable multivibrator
with reset
if C
The inherent test jig and pin capacitance at pins 15 and 7 (nR
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 C
The inherent test jig and pin capacitance at pins 15 and 7 (nR
R
C
= 1.5V at V
are the typical output voltage drop that occur with the output
EXT
EXT
where, t
where, t
Figure 1.Output pulse control using retrigger pulse;
EXT
EXT
> 10 nF, the next formula is valid:
> 10 pF, the next formula (at V
r
= t
t
R
K
t
C
R
W
W
rt
rt
External timing
External timing
resistor
resistor
External timing
External timing
capacitor
ca acitor
EXT
CC
EXT
EXT
EXT
f
t
W
PARAMETER
w 2.7V; V
2.5ns; C
and C
= K x R
= output pulse width in ns;
= external resistor in K ; C
= constant = 0.45 for V
= 30 + 0.19R x C
= retrigger time in ns;
= external capacitor in pF;
= external resistor in K .
t
W
EXT
EXT
L
nR
M
= 50pF; R
combinations see Figure 5.
= 0.5 V
D
x C
CC
CC
= HIGH.
EXT
= 3.3V.
= 5.0V.
-9
CC
WAVEFORM
(typ.)
+ 13 x R
L
t
rt
=1 K
Figure 5
Figure 5
at V
CC
CC
t
W
= 5.0V) for the set-up time of a retrigger pulse is valid:
CC
= 5.0V and 0.48 for V
EXT
1.05
t 2.7V; V
3
3
3
= external capacitor in pF;
(typ.)
t
W
amb
= 25 C.
OL
t
W
SV00139
and
CONDITION
CONDITION
EXT
EXT
3.0 to 3.6
4.5 to 5.5
3.0 to 3.6
4.5 to 5.5
V
CC
CC
1.2
2.0
2.7
1.2
2.0
2.7
/C
/C
= 2.0V.
(V)
EXT
EXT
8
) is approximately 7 pF.
) is approximately 7 pF.
nB INPUT
nR
nQ OUTPUT
EXT
D
EXT
INPUT
Figure 2.Output pulse control using reset input nR
< 50pF.
and C
MIN
10
5
3
2
2
EXT
–40 to +85 C
.
t
W
TYP
t
W
nA = LOW.
No limits
LIMITS
MAX
1000
1000
1000
1000
1000
–40 to +125 C
MIN
Product specification
MAX
74LV123
t
W
UNIT
SV00140
D
pF
;