MEC1404 Datasheet, PDF (504/572 Pages) Microchip Technology – Keyboard and Embedded Controller Products for Notebook PC

MEC140X/1X
43.0 TIMING DIAGRAMS
Note: Timing values are preliminary and may change after characterization.
43.1 Voltage Thresholds and Power Good Timing
43.1.1 VTR THRESHOLD AND VTRGD TIMING
VTR
G litch protected
Signal output
VTRG D (internal)
EC_PROC_RESET#
VTH1
V TH2
U ndefined
Forced to logic ‘0’
t1
F u n c tio n a l
t3
VTH2
VTH1
Forced to logic ‘0’ U ndefined
t2
TABLE 43-1: VTR POWER GOOD TIMING
Parameters
Symbol
VTR Threshold for Pin Glitch Protection
active
V_TH1
VTR Power Good Threshold
VTR Rise Time (Off to VTR =V_Threshold)
VTR Fall Time (VTR =V_Threshold) to Off
VTR > V_TH2 to VTRGD (internal) asserted
VTR < V_TH2 to VTRGD (internal) deasserted
VTR > V_TH2 to EC_PROC_RESET# deas-
serted
V_TH2
V_Rise
V_Fall
t1
t2
t3
MIN
0.9
2.16
200
200
TYP
1
2.4
600
100
1
MAX
1.1
2.64
Unit
V
V
s
s
s
ns
ms
Notes
Note:
Note: The Embedded Controller starts executing instructions when EC_PROC_ RESET deasserts.
DS00001956D-page 504
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