HV518
Power-Up/ Power-Down Sequences
Power-up sequence should be the following:
1. Connect ground.
2. Apply VDD.
3. Set all inputs (Data, CLK, Enable, etc.) to a known state.
4. Apply VPP.
5. The VPP should not drop below VDD or float during operation.
Power-down sequence should be the reverse of the above.
Input and Output Equivalent Circuits
VDD
VDD
VPP
DATA
OUT
HVOUT
INPUT
GND
GND
GND
Parameter Measurement Information
t
w(CKH)
t
w(CKH)
V
IH
V
IH
Clock
50%
Clock
50%
V
IL
V
IL
t
w(CKL)
t
t
d
t
su
h
V
OH
V
V
Data
Output
IH
IL
50%
Data In
V
OL
Figure 1
Input Timing Voltage Waveforms
V
IH
V
V
50%
t
IH
IL
Strobe
Latch Enable
HV Output
50%
V
IL
t
DLH
DHL
t
or t
DHL
V
DLH
OH
90%
10%
HV Output
V
V
OH
OL
90%
10%
V
OL
t
t
THL
TLH
Figure 3: Input Timing Voltage Waveforms
Figure 2
Note: For testing purposes, all input pulses have maximum rise and fall times of 30 nsec.
4
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