MP75L43 View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'MP75L43' PDF : 8 Pages View PDF
MP75L43
tSRI
SR1
Bit 1
MSB
Bit 2
Bit 11
Bit 12
LSB
tDS1, tDS2, tDS4
tDH1, tDH2, tDH4
Strobe Input
(STB1, STB2, STB4
(Note)
1
2
11
12
tSTB1
tSTB2
tSTB4
LOADING REGISTER A
LD1 AND LD2
Note:
Strobe Waveform is Inverted if
STB3 is Used to Strobe Serial Data Bits
into Register A
tASB
tLD1
tLD2
Loading Register B
with Contents of Register A
Figure 1. Timing Diagram
MP75L43 Logic Inputs
Register A Control Inputs
STB4 STB3 STB2 STB1
0
1
0
0
1
0
0
0
0
1
0
0
1
X
X
X
X
0
X
X
X
X
1
X
X
X
X
1
Register B Control Inputs
CLR LD2 LD1
MP75L43 Operation
X
X
X
X
X
X
X
X
X
X
X
X
Data appearing at SRI strobed into Register A
Data appearing at SRI strobed into Register A
Data appearing at SRI strobed into Register A
Data appearing at SRI strobed into Register A
No Operation (Register A)
0
X
X
1
1
X
1
X
1
1
0
0
Clear Register B to code 0000 0000 0000 (Asynchronous)
No Operation (Register B)
Load Register B with the contents of Register A
NOTES
1. CLR = 0 Asynchronously resets Register B to 0000 0000 0000, but has no effect on Register A.
2. Serial data is loaded into Register A MSB first, on edges shown is positive edge, is negative edge.
3. 0 = Logic LOW, 1 = Logic HIGH, X = Don’t Care.
Notes
2, 3
2, 3
2, 3
2, 3
3
1, 3
3
3
Rev. 1.00
Table 1. Truth Table
5
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