HV2221 查看數據表（PDF） - Supertex Inc
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HV2221 Datasheet PDF : 8 Pages
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HV2221
Truth Table
D0 D1 D2 D3 D4 D5 D6 D7 LE CLR SW0 SW1 SW2 SW3 SW4 SW5 SW6 SW7
L
L L Off
H
L L On
L
LL
Off
H
LL
On
L
LL
Off
H
LL
On
L
LL
Off
H
LL
On
L
LL
Off
H
LL
On
L
LL
Off
H
LL
On
L
LL
Off
H
LL
On
LLL
Off
HLL
On
XXXXXXXXH L
Hold Previous State
XXXXXXXXXH
All Switches Off
Notes:
1. The eight switches operate independently.
2. Serial data is clocked in on the L to H transition of the CLK.
3. The switches go to a state retaining their present condition at the rising edge of LE. When LE is low the shift register data flow through the latch.
4. DOUT is high when data in the shift register 7 is high.
5. Shift register clocking has no effect on the switch states if LE is high.
6. The CLR clear input overrides all other inputs.
Logic Timing Waveforms
DN+1
DN
DN-1
DATA IN
50%
50%
LE
CLK
DATA OUT
OFF
VOUT
(typ)
ON
CLR
50%
50%
50%
tWLE
tSD
50%
tSU
th
tDO
50%
tOFF
90%
50%
tWCL
50%
tON
10%
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
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