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X4643 Datasheet, PDF (17/21 Pages) Xicor Inc. – CPU Supervisor with 64K EEPROM
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X4643, X4645
Power-Up and Power-Down Timing
VCC
VTRIP
0 Volts
tPURST
tPURST
tF
tR
tRPD
RESET
(X4645)
RESET
(X4643)
RESET Output Timing
Symbol
VTRIP
tPURST
tRPD(8)
tF(8)
tR(8)
VRVALID
Parameter
Reset Trip Point Voltage, X4643/5-4.5A
Reset Trip Point Voltage, X4643/5
Reset Trip Point Voltage, X4643/5-2.7A
Reset Trip Point Voltage, X4643/5-2.7
Power-up Reset Time Out
VCC Detect to Reset/Output
VCC Fall Time
VCC Rise Time
Reset Valid VCC
Notes: (8) This parameter is periodically sampled and not 100% tested.
SDA vs. RESET Timing
tRSP
tRSP<tWDO
tRSP>tWDO
SCL
SDA
VRVALID
VRVALID
Min.
4.5
4.25
2.85
2.55
100
100
100
1
Typ.
4.62
4.38
2.92
2.62
250
Max.
4.75
4.5
3.0
2.7
400
500
Unit
V
ms
ns
µs
µs
V
tRST
tRSP>tWDO
tRST
RESET
Note: All inputs are ignored during the active reset period (tRST).
17
FN8123.0
March 29, 2005
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