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UPD720122 Datasheet(PDF) 40 Page - NEC

No. de pieza UPD720122
Descripción Electrónicos  MOS Integrated Circuit
PDF  82 Pages
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Fabricante Electrónico  NEC [NEC]
Página de inicio  http://www.nec.com/
Logo NEC - NEC

UPD720122 Datasheet(HTML) 40 Page - NEC

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Data Sheet S16685EJ2V0DS
40
µPD720122
(2) CPU bus write operation
Symbol
Parameter
Min.
Typ.
Max.
Unit
TB13
Write cycle time
58
ns
TB14
Address setup time (ALE
↓)
17
ns
TB15
Chip select setup time (ALE
↓)
17
ns
TB16
Write command delay time (ALE
↓)
7
ns
TB17
Input data setup time (WRB
↑)
10
ns
TB18
Input data hold time (WRB
↑)
0
ns
TB19
Write command width
34
ns
TB20
Chip select hold time (WRB
↑)
0
ns
TB21
Chip select setup time (WRB
↓)
5
ns
Remark
It is assumed that the external pin capacitance is 15 pF (data bus = 50 pF).
CPU bus write timing
WRB
AD7 to AD0
Note
D15 to D8
CSB
ADDRESS
VALID
tb18
tb19
ALE
DATA
VALID
tb2
tb16
tb20
ADDRESS
VALID
tb13
tb17
tb10
tb21
tb15
tb9
Note
D7 to D0 for Function 2



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