LTC6994CS6-2#PBF Linear Technology, LTC6994CS6-2#PBF Datasheet - Page 19

• Manufacturer Part Number: LTC6994CS6-2#PBF
• Manufacturer: Linear Technology

Specifications of LTC6994CS6-2#PBF

• Lead Free Status / Rohs Status: Compliant

applicaTions inForMaTion
Power Supply Current
The Electrical Characteristics table specifies the supply
current while the part is idle (waiting for an input transi-
tion). I
supply voltage, as described by the equations in Table 2,
valid for both the LTC6994-1 and LTC6994-2.
Table 2. Approximate Idle Supply Current Equations
When an input transition starts the delay timing circuity,
the instantaneous supply current increases to I
CONDITION
N
I
N
S(ACTIVE)
DIV
DIV
Figure 14. I
≥ 512
S(IDLE)
≤ 64
250
200
100
150
50
“IDLE”
0
= I
varies with the programmed t
V
INPUT PULSE WIDTH = 1.1 • t
÷1, R
C
R
S(IDLE)
+
LOAD
LOAD
S(ACTIVE)
= 3.3V
V
SET
+
0.2
= 5pF
= ∞
• N
V
= 50k
(
+
DIV
+ ∆I
•N
t
t
DELAY
DELAY
vs Input Frequency, LTC6994-1
DIV
• 7pF + 4pF
0.4
f
IN
S(ACTIVE)
• 7pF
• t
DELAY
TYPICAL I
÷1, R
÷1, R
+
0.6
÷8, R
500kΩ
)
DELAY
SET
SET
+
V
SET
+
500kΩ
= 100k
= 800k
V
S(IDLE)
0.8
= 50k
+
+ 1.8 •I
699412 F14
+ 2.2 •I
1.0
SET
DELAY
+ 50µA
SET
S(ACTIVE)
+ 50µA
and the
.
∆I
assuming a periodic input with frequency f
tions assume the input pulse width is greater than t
otherwise, the output will not transition (and the increase
in supply current will be less).
Table 3. Active Increase in Supply Current
*Ignoring resistive loads (assumes R
Figures 14 and 15 show how the supply current increases
from I
N
CONDITION
DIV
N
S(ACTIVE)
N
DIV
DIV
settings, the increase in active current is smaller.
≥ 512
Figure 15. I
≤ 64
S(IDLE
250
200
100
150
can be estimated using the equations in Table 3,
50
“IDLE”
0
) as the input frequency increases. At higher
LTC6994-1/LTC6994-2
Either Version
LTC6994-1
LTC6994-2
V
f
FALLING DELAYS TO REACH THE OUTPUT
IN
C
R
+
DEVICE
LOAD
LOAD
= 3.3V
S(ACTIVE)
< 1/(2 • t
0.1
= 5pF
= ∞
÷1, R
DELAY
SET
vs Input Frequency, LTC6994-2
0.2
f
) TO ALLOW RISING AND
IN
f
= 50k
f
IN
IN
• t
• V
LOAD
DELAY
• V
+
0.3
+
• (N
÷1, R
÷1, R
• (N
= ∞)
TYPICAL ∆I
÷8, R
DIV
f
DIV
IN
SET
SET
SET
0.4
• V
• 10pF + 22pF + C
• 5pF + 18pF + C
= 100k
= 800k
= 50k
699412 F15
+
• C
S(ACTIVE)
0.5
LOAD
IN
. The equa-
*
19
LOAD
DELAY
LOAD
699412fa
)
)
;