9601 Datasheet, PDF (3/6 Pages) National Semiconductor (TI) – Retriggerable One Shot

Switching Characteristics at V_CC e 5V and T_A e 25 C (See Section 1 for Test Waveforms and Output Load)
Symbol
Parameter
From (Input)
To (Output)
Conditions
Min
Max
Units
t_PLH
Propagation Delay Time
Negative Trigger
C_L e 15 pF
Low to High Level Output
Input to
C_X e 0
True Output
R_X e 5 kX
t_PHL
Propagation Delay Time
Negative Trigger
High to Low Level Output
Input to
Complement Output
40
ns
40
ns
t_PW(MIN)
Minimum True Output
Pulse Width
65
ns
t_PW
C_STRAY
Pulse Width
Maximum Allowable
Wiring Capacitance
R_X e 10 kX
C_X e 1000 pF
3 08
3 76
ms
Pin 13 to GND
50
pF
R_X
External Timing Resistor
R_X
External Timing Resistor
DM96
DM86
25
kX
50
kX
Operating Rules
1 An external resistor R_X and an external capacitor C_X are
required for operation The value of R_X can vary between
the limits shown in switching characteristics The value of
C_X is optional and may be adjusted to achieve the re-
quired output pulse width
2 Output pulse width t_PW may be calculated as follows
( ^{tPW e K RXCX}
07
1a
R_X
(for C_X ^l 10³ pF)
K 0 34
R_X in kX C_X in pF and t_PW in ns
(For C_X ^k 10³ pF see curve )
3 R_X and C_X must be kept as close as possible to the
circuit in order to minimize stray capacitance and noise
pickup If remote trimming is required R_X may be split up
such that at least R_X(MIN) must be as close as possible
to the circuit and the remote portion of the trimming re-
sistor R ^k R_X(MAX) b R_X
4 Set-up time (t₁) for input trigger pulse must be ^l 40 ns
(See Figure 1 )
Release time (t₂) for input trigger pulse must be ^l 40 ns
(See Figure 2 )
5 Retrigger pulse width (see Figure 3 ) is calculated as fol-
lows
(^{0 7}
t_W e t_PW a t_PLH e K R_XC_X
1a
R_X
a t_PLH
FIGURE 3
TL F 6610 – 4
Typical ‘‘K’’ Coefficient Variation vs Timing Capacitance
The multiplicative factor ‘‘K’’ varies as a function of the tim-
ing capacitor C_X The graph below details this characteris-
tic
FIGURE 1
FIGURE 2
TL F 6610 – 2
TL F 6610 – 5
For further detailed device characteristics and output performance please
refer to the NSC one-shot application note AN-366
TL F 6610 – 3
3