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SMS2902 Datasheet(PDF) 4 Page - Summit Microelectronics, Inc.

Part No. SMS2902
Description  Voltage Supervisory Circuit With Watchdog Timer
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Maker  SUMMIT [Summit Microelectronics, Inc.]
Homepage  http://www.summitmicro.com
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 4 page
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4
SMS2902/SMS2904/SMS2916
2028 5.1 8/2/00
FIGURE 2. RESET OUTPUT TIMING
RESET CIRCUIT AC and DC ELECTRICAL CHARACTERISTICS
TA=-40°C to +85°C
Symbol
Parameter
Part no.
Min.
Typ.
Max.
Unit
Suffix
VTRIP
Reset Trip Point
A (or) Blank
4.250
4.375
4.5
V
B
4.50
4.625
4.75
V
2.7
2.55
2.65
2.75
V
tPURST
Reset Timeout
200
ms
tRPD
VTRIP to RESET Output Delay
5
µs
VRVALID
RESET Output Valid to VCC min. Guarantee
1
V
tGLITCH
Glitch Reject Pulse Width note 1
30
ns
VOLRS
RESET Output Low Voltage IOL = 1mA
0.4
V
VOHRS
RESET High Voltage Output IOH = 800µA
VCC-.75
V
VULH
VSENSE Under-voltage threshold low to high
1.20
1.25
1.30
V
VUHL
VSENSE Under-voltage threshold high to low
1.20
1.25
1.30
V
VOLH
VSENSE Over-voltage threshold low to high
1.20
1.25
1.30
V
VOHL
VSENSE Over-voltage threshold high to low
1.20
1.25
1.30
V
tVD1
Delay to VLOW Active
5
µs
tVD2
Delay to VLOW Released
5
µs
tWDTO
Watchdog timeout Period
1600
ms
VCC
VRVALID
VTRIP
tPURST
RESET#
RESET
2028 T fig02 2.0
tGLITCH
tRPD
tPURST
tRPD




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