ne56605-42 NXP Semiconductors, ne56605-42 Datasheet - Page 5

• Manufacturer Part Number: ne56605-42
• Description: System Reset With Built-in Watchdog Timer
• Manufacturer: NXP Semiconductors

1. ‘Watchdog monitoring time’ is the duration from the last pulse (negative-going edge) of the timer clear clock pulse until reset output pulse
2. ‘Watchdog reset time’ is the reset pulse width (see Figure 18).
3. ‘Power-on reset delay time’ is the duration measured from the time V
4. ‘RESET, RESET propagation delay time’ is the duration from when the supply voltage sags below the lower detection threshold (V
5. RESET, RESET rise and fall times are measured at 10% and 90% output levels.
6. Watchdog monitoring time (t
Philips Semiconductors
AC ELECTRICAL CHARACTERISTICS
Characteristics measured with V
See Figure 24 (Test circuit 2) for test configuration used for AC parameters.
NOTES:
2003 Oct 15
t
t
t
t
t
t
t
t
t
t
t
t
SYMBOL
P1
CLKW
CLK
WDM
WDR
PR
PD1
PD2
R1
R2
F1
F2
System reset with built-in watchdog timer
occurs (see Figure 18). A reset signal is output if a clock pulse is not input during this time.
release is experienced (RESET output HIGH; RESET output LOW).
reset occurs (RESET output LOW, RESET output HIGH).
varying the C
to 10 F.
Formula 1. Calculation for approximate t
Example: When C
Minimum power supply pulse width for
detection
Clock input pulse width
Clock input cycle
Watchdog monitoring time (Notes 1, 6)
Watchdog reset time (Notes 2, 6)
Power-on reset delay time (Notes 3, 6)
RESET, RESET propagation delay time
(Note 4)
(Note 4)
RESET, RESET rise time (Note 5)
RESET, RESET fall time (Note 5)
T
capacitance. The times can be approximated by applying the following formula. The recommended range for C
T
t
t
t
t
t
t
PR
WDM
WDR
PR
WDM
WDR
= 0.1 F and WD
(ms)
PARAMETER
(ms)
100 ms
(ms)
2.0 ms
WDM
10 ms
CC
1000
= 5.0 V, and T
), watchdog reset time (t
20
100
C
C
C
C
T
T
= open:
T
( F)
( F)
PR
( F)
, t
amb
WDM
= 25 C, unless otherwise specified.
, and t
4.0 V
WDR
WDR
RESET: R
RESET: R
RESET: R
V
RESET: R
RESET: R
RESET: R
CC
), and power-on reset delay time (t
values:
negative-going V
C
= rising from 0 V; C
T
= 0.1 F; R
5
CC
L1
L1
L1
CONDITIONS
L2
L2
L2
C
= 2.2 k ; C
= 2.2 k ; C
= 2.2 k ; C
exceeds the upper detection threshold (V
T
= 10 k ; C
= 10 k ; C
= 10 k ; C
= 0.1 F
CT
CC
= open
L1
L1
L1
L2
L2
L2
T
pulse
= 0.1 F
= 100 pF
= 100 pF
= 100 pF
= 20 pF
= 20 pF
= 20 pF
5.0 V
PR
) during power-on can be modified by
MIN.
8.0
3.0
5.0
1.0
20
50
–
–
–
–
–
–
TYP.
100
SH
2.0
2.0
3.0
1.0
1.0
0.1
0.5
10
–
–
–
NE56605-42
) and power-on reset
MAX.
150
3.0
1.5
1.5
0.5
1.0
15
10
10
–
–
–
T
is 0.001 F
Product data
SL
) and
UNIT
ms
ms
ms
s
s
s
s
s
s
s
s
s