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UPD720122 Datasheet(PDF) 22 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) 22 Page - NEC

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Data Sheet S16685EJ2V0DS
22
µPD720122
(2) CPU bus write operation
Symbol
Parameter
Min.
Typ.
Max.
Unit
T11
Write cycle time
68
∞
ns
T12
Address setup time (WRB
↓)
5
∞
ns
T13
Chip select setup time (WRB
↓)
5
∞
ns
T14
Write command width
34
∞
ns
T15
Address hold time (WRB
↑)
5
∞
ns
T16
Chip select hold time (WRB
↑)
5
∞
ns
T17
WRB inactive time
34
∞
ns
T18
Input data setup time
10
∞
ns
T19
Input data hold time
0
∞
ns
Remark
It is assumed that the external pin capacitance is 15 pF (data bus = 50 pF).
CPU bus write timing
WRB
RDB
A7 to A1
D15 to D0
CSB
VALID
t12
t13
t14
t19
t15
t16
t18
High level
t11
t17
VALID



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