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UPD720122 Folha de dados(PDF) 21 Page - NEC

Nome de Peças UPD720122
Descrição Electrónicos  MOS Integrated Circuit
PDF  82 Pages
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Fabricante Electrônico  NEC [NEC]
Página de início  http://www.nec.com/
Logo NEC - NEC

UPD720122 Folha de dados(HTML) 21 Page - NEC

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Data Sheet S16685EJ2V0DS
21
µPD720122
2.6.2
AC characteristics of BIU block with Function 1 selected
(1) CPU BUS read operation
Symbol
Parameter
Min.
Typ.
Max.
Unit
T1
Read cycle time
91
∞
ns
T2
Address setup time (RDB
↓)
5
∞
ns
T3
Chip select setup time (RDB
↓)
5
∞
ns
T4
Buffer direction change time (RDB
↓)
−
14
ns
T5
Output data delay time (RDB
↓)
−
57
ns
T6
Read command width
57
∞
ns
T7
Chip select hold time (RDB
↑)
5
∞
ns
T8
Address hold time (RDB
↑)
5
∞
ns
T9
RDB inactive time
34
∞
ns
T10
Output data hold time (RDB
↑)
4
−
ns
Remark
It is assumed that the external pin capacitance is 15 pF (data bus = 50 pF).
CPU bus read timing
RDB
WRB
A7 to A1
D15 to D0
CSB
VALID
VALID
t3
t5
t6
t10
t8
t7
High level
INVALID
t4
High level
t1
t9
t2



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