MAX13037/MAX13038
Automotive Contact Monitor and
Level Shifters with LDO Regulator
_______________________________________________________________________________________ 5
TIMING CHARACTERISTICS (continued)
(BAT = +6V to +26V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at BAT = +14V, T
A
= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SDI to Falling Edge of CLK
Required Setup Time
t
SI(SU)
Input rise/fall time < 2ns, Figure 1 30 ns
Falling Edge of CLK to SDI
Required Hold Time
t
SI
HOLD
Input rise/fall time < 2ns, Figure 1 20 ns
Time from Falling Edge of CS to
SDO Low Impedance
t
SO(EN)
Input rise/fall time < 2ns, Figure 1 55 ns
Time from Rising Edge of CS to
SDO High Impedance
t
SO
DIS
Figures 1 and 2 55 ns
Time from Rising Edge of CLK to
SDO Data Valid
t
VALID
C
SDO
=15pF, Figure 1 70 ms
C
TDEB
= 500pF 3.18 5.9 9.42 ms
Debounce Time t
DEB
C
TDEB
= 10nF 63 120 188 ms
Scanning Time Pulse t
SCAN
130 250 400 µs
Scanning Time Period t
SCAN-P
SC0 = 0, SC1 = 1, SC2 = 1 4 8 14 ms
Wetting Time Pulse t
WETT
WTOFF = 0 10 21 35 ms
Time from Shutdown to Normal
Operation
t
SD
SD low-to-high transition to input monitoring
enabled
200 µs
Time from SCAN Mode to Normal
Operation
t
SM
(Note 8) 500 µs
Reset Output Pulse Width t
RST
C
TD
= 10nF (Figure 3) 10 21 36 ms
Watchdog Timeout Period 1 t
WD1
C
TD
= 10nF, time before INT goes low
(Figure 3)
40 84 144 ms
Watchdog Timeout Period 2 t
WD2
C
TD
= 10nF, time before RST goes low
(Figure 3)
2 x t
WD1
ms
Minimum Watchdog Timeout
Reset on WDI
t
WDI
300 ns
Note 2: All units are 100% production tested at T
A
= 125°C. Limits over the operating temperature range are guaranteed by design and
not production tested.
Note 3: V
TH_C
= (V
TH_HIGH
+ V
TH_LOW
) / 2.
Note 4: V
TH_HYS
= (V
TH_HIGH
- V
TH_LOW
).
Note 5: Wetting current rise/fall time is measured as the time it takes to go from 20% to 80% of the maximum wetting current.
Note 6: T
SHDN
is the temperature at which the wetting currents and LDO are disabled.
Note 7: T
WARN
is the temperature at which only the wetting currents are disabled.
Note 8: When exiting SCAN mode to enter Normal Mode (through SPI) any input change is ignored for 500µs (typ) to allow correct
wake-up of input comparators. After this time elapses, the inputs are monitored in continuous mode.
