HV257 SUTEX [Supertex, Inc], HV257 Datasheet - Page 3

• Manufacturer Part Number: HV257
• Description: 32 CHANNEL HIGH VOLTAGE SAMPLE AND HOLD AMPLIFIER ARRAY
• Manufacturer: SUTEX [Supertex, Inc]

Power Up/Down Sequence
The device can be damaged due to improper power up / down
sequence. To prevent damage, please follow the acceptable
power up /down sequences and add two external diodes as
shown in the diagram below. The first diode is a high voltage
diode across V
connected to V
Vpp. Any low current high voltage diode such as a 1N4004 will
be adequate. The second diode is a schottky diode across V
and DGnd where the anode of the schottky diode is connected
to V
schottky diode such as a 1N5817 will be adequate.
Sample and Hold
Logic Decoder
Diode
PIV
I
V
R
C
RD
V
T
T
V
V
l
l
V
T
Symbol
Symbol
Symbol
IH
IL
F
V
V
PED
SIG
SU
H
IH
IL
F
C
SW
NN
DD
NN
ROOP
and the cathode is connected to DGnd. Any low current
Pedestal Voltage
Droop rate during hold time relative to input
Input voltage range
Hold time-address to enable bar
Input logic high voltage
Input logic low voltage
Input logic high current
Input logic low current
Peak inverse voltage
Forward diode drop
Forward diode current
Sample and Hold Switch resistance
Sample and Hold Capacitor
Set-up time-address to enable
V
or similar
or similar
F
DD
1N4004
1N5817
temperature coefficient
PP
and the cathode of the diode is connected to
and V
DD
where the anode of the diode is
Parameter
Parameter
Parameter
V
DGND
PP
Acceptable Power Up Sequences
1) V
or
1) V
Acceptable Power Down Sequences
1) Inputs & Anode
or
1) Inputs & Anode
PP
NN
NN
-1.0
Min
Min
Min
2.4
0
75
75
0
2) V
2) V
3
NN
DD
-2.20
0.60
Typ
Typ
Typ
1.0
5.0
10
2) V
2) V
12.0
DD
PP
Max
Max
Max
2.0
V
100
5.0
5.0
1.2
1.0
D
D
3) V
3) V
m
Units
Units
Units
DD
PP
mV
V/s
KΩ
µA
µA
V
pF
V
V
V
µA
ns
ns
V
V
˚ /
C
3) V
3) V
If = 100µA, anode to cathode@25
input referred
output referred
V
V
cathode to anode
anode to cathode
anode to cathode
NN
DD
IH
IL
=
=
0
V
4) Inputs & Anode
4) Inputs & Anode
V
D
D
Conditions
Conditions
Conditions
4) V
4) V
PP
NN
HV257
A122104
O
C