74HCT123DB NXP Semiconductors, 74HCT123DB Datasheet - Page 10

• Manufacturer Part Number: 74HCT123DB
• Manufacturer: NXP Semiconductors

Specifications of 74HCT123DB

• Logic Family: HCT
• High Level Output Current: -4mA
• Low Level Output Current: 4mA
• Quiescent Current: 8nA
• Number Of Elements: 2
• Operating Temperature Classification: Automotive
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (typ): 5V
• Operating Temperature (min): -40C
• Operating Temperature (max): 125C
• Technology: CMOS
• Abs. Propagation Delay Time: 77ns
• Operating Supply Voltage (min): 4.5V
• Lead Free Status / RoHS Status: Compliant

NXP Semiconductors
Table 7.
Voltages are referenced to GND (ground = 0 V); C
[1]
[2]
[3]
[4]
[5]
74HC_HCT123_5
Product data sheet
Symbol Parameter
t
t
R
C
C
W
rtrig
EXT
EXT
PD
t
For other R
t
t
R
C
K = constant = 0.45 for V
The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is approximately 7 pF.
The time to retrigger the monostable multivibrator depends on the values of R
extended when the time between the active-going edges of the trigger input pulses meets the minimum retrigger time. If C
the next formula (at V
t
t
C
The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is 7 pF.
When the device is powered-up, initiate the device via a reset pulse, when C
C
P
f
f
D = duty factor in %;
C
V
C
pd
W
W
rtrig
rtrig
i
o
D
CC
EXT
EXT
EXT
PD
= input frequency in MHz;
L
EXT
(C
= output frequency in MHz;
= K
= typical output pulse width in ns;
is the same as t
= output load capacitance in pF;
= C
L
= 30 + 0.19
= retrigger time in ns;
is used to determine the dynamic power dissipation (P
= supply voltage in V;
= external resistor in k ;
= external capacitor in pF;
= external capacitor in pF; R
= timing capacitance in pF;
pulse width
retrigger time
external timing
resistor
external timing
capacitor
power
dissipation
capacitance
PD
V
Dynamic characteristics
R
CC
EXT
EXT
2
V
CC
f
and C
o
2
C
) sum of outputs.
EXT
R
PHL
f
EXT
i
+ (C
, where:
EXT
CC
and t
= 5.0 V) for the setup time of a retrigger pulse is valid:
Conditions
V
nA LOW; see
nB HIGH; see
nRD LOW; see
nQ HIGH and nQ LOW;
V
see
nA, nB; C
R
see
V
V
per monostable;
V
CC
combinations see
C
CC
CC
CC
CC
I
EXT
L
EXT
C
R
C
R
= GND to V
PLH
= 5.0 V and 0.55 for V
EXT
EXT
EXT
EXT
Figure 10
Figure 10
= 4.5 V
= 5.0 V;
= 5.0 V; see
= 5.0 V; see
V
0.9
= 5 k ; V
; t
CC
t
+ 13
= 100 nF;
= 10 k
= 0 pF;
= 5 k
EXT
is the same as t
2
EXT
f
= external resistor in k .
o
…continued
) + 0.75
= 0 pF;
Figure 10
R
CC
and
Figure 10
CC
EXT
Figure 11
Figure
Figure 7
Figure 7
= 5.0 V;
1.05
11
, where:
C
CC
THL
7. If C
EXT
L
Rev. 05 — 13 July 2009
= 50 pF unless otherwise specified; for test circuit see
= 2.0 V.
and t
[3][4]
EXT
V
[2]
[4]
[5]
CC
D
TLH
> 10 nF, the next formula is valid.
in W).
2
Dual retriggerable monostable multivibrator with reset
Min
20
20
20
2
-
-
-
-
-
f
o
+ D
25 C
Typ
450
110
75
56
3
5
7
-
-
16
EXT
1000
EXT
V
Max
CC
-
-
-
-
-
-
-
-
< 50 pF.
74HC123; 74HCT123
and C
where:
40 C to +85 C
Min
EXT
25
25
25
-
-
-
-
-
-
. The output pulse width will only be
Max
-
-
-
-
-
-
-
-
-
40 C to +125 C Unit
Min
30
30
30
-
-
-
-
-
-
© NXP B.V. 2009. All rights reserved.
Figure
Max
-
-
-
-
-
-
-
-
-
EXT
12.
>10 pF,
10 of 24
ns
ns
ns
ns
ns
k
pF
pF
s