LTC2917H 데이터 시트보기 (PDF) - Linear Technology
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LTC2917H Datasheet PDF : 16 Pages
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LTC2917/LTC2918
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 2.5V, unless otherwise noted. (Note 2)
SYMBOL
PARAMETER
Reset Output (RST)
CONDITIONS
MIN
TYP
MAX UNITS
tRST(INT)
Internal Reset Timeout Period
VRT = VCC
● 150
200
260
ms
tRST(EXT)
tUV
VOL
IOH(RST)
Adjustable Reset Timeout Period
CRT = 2.2nF
● 16
20
25
ms
VM Undervoltage Detect to RST
VM Less Than Reset Threshold
● 10
80
150
μs
Asserted
VMTX by More Than 5%
Output Voltage Low RST
VCC = 3.3V, IRST = 2.5mA
●
VCC = 1V, IRST = 100μA
●
VCC = 0.8V, IRST = 15μA
●
0.15
0.4
V
0.15
0.3
V
0.05
0.2
V
RST Output Voltage High Leakage
RST = VCC
●
±1
μA
Watchdog Timer Control (WT)
IWT(UP)
WT Pull-Up Current
IWT(DOWN)
WT Pull-Down Current
VWT(INT, LH)
WT Internal Timer Threshold
IWT(INT)
Internal WT VCC Detect Current
IWT(DIS)
Watchdog Disable Hold Current
Watchdog Input (WDI)
VWT = 0.25V
VWT = 1.1V
VWT Rising, Referenced to VCC
VWT = VCC
VWT = 0V
● –2
–3
–4
μA
●
2
3
4
μA
● –100
–160
–300
mV
●
1
8
μA
–3.5
μA
tWDU(INT)
tWDL(INT)
Internal Watchdog Upper Boundary
Internal Watchdog Lower Boundary
(Note 5)
VWT = VCC
B Versions, VWT = VCC
● 1.3
1.6
2
s
● 37.5
50
62.5
ms
tWDU(EXT)
tWDL(EXT)
External Watchdog Upper Boundary
External Watchdog Lower Boundary
(Note 5)
CWT = 2.2nF
B Versions, CWT = 2.2nF
● 130
160
200
ms
●
tWDU(EXT)/32
ms
VIL(WDI)
VIH(WDI)
tPW(WDI)
Input Low Voltage
Input High Voltage
Input Pulsewidth
WDI Leakage Current
●
● 1.1
● 400
●
0.4
V
V
ns
±1
μA
Manual Reset Input (LTC2918)
VIL(MR)
VIH(MR)
RPU
tPW(MR)
Input Low Voltage
Input High Voltage
Pull-Up Resistance
Pulsewidth
●
0.2 • VCC
V
● 0.8 • VCC
V
● 50
100
150
kΩ
● 250
ns
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All currents into pins are positive; all voltages are referenced to
GND unless otherwise noted.
Note 3: VCC maximum pin voltage is limited by input current. Since the
VCC pin has an internal 6.2V shunt regulator, a low impedance supply
which exceeds 5.7V may exceed the rated terminal current. Operation
from higher voltage supplies requires a series dropping resistor. See
Applications Information.
Note 4: Input impedance is dependent on the configuration of the SEL
pins.
Note 5: In the LTC2917-B/LTC2918-B, edges must occur on WDI with a
period between the lower and upper boundary or RST is invoked. For the
LTC2917-A/LTC2918-A, the edges must simply occur before the upper
boundary. See Applications Information.
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