參數(shù)資料
型號: DS3253
英文描述: Single/Dual/Triple/Quad DS3/E3/STS-1 LIUs
中文描述: 單/雙/三/四路、DS3/E3/STS-1 LIU
文件頁數(shù): 49/71頁
文件大小: 925K
代理商: DS3253
DS3251/DS3252/DS3253/DS3254
49 of 71
Table 17-H. Parallel CPU Interface Timing
(V
DD
= 3.3V 5%, T
A
= -40°C to +85°C.) (
Figure 17-3
and
Figure 17-4
)
PARAMETER
Setup Time for A[5:0] Valid to
CS
Active (Notes 1, 2)
Setup Time for
CS
Active to
RD
,
WR
, or
DS
Active
Delay Time from
RD
or
DS
Active to D[7:0] Valid
Hold Time from
RD
or
WR
or
DS
Inactive to
CS
Inactive
Delay from
CS
or
RD
or
DS
Inactive to D[7:0] Invalid or Tri-
State (Note 3)
Wait Time from
WR
or
DS
Active to Latch D[7:0]
D[7:0] Setup Time to
WR
or
DS
Inactive
D[7:0] Hold Time from
WR
or
DS
Inactive
A[5:0] Hold Time from
WR
or
RD
or
DS
Inactive
RD
,
WR
, or
DS
Inactive Time
Muxed Address Valid to ALE Falling (Note 4)
Muxed Address Hold Time (Note 4)
ALE Pulse Width (Note 4)
Setup Time for ALE High or Muxed Address Valid to
CS
Active (Note 4)
Note 1:
D[7:0] loaded with 50pF when tested as outputs.
Note 2:
If a gapped clock is applied on TCLK and local loopback is enabled, read cycle time must be extended by the length of the largest
TCLK gap.
Note 3:
Not tested during production test.
Note 4:
In nonmultiplexed bus applications (
Figure 17-3
), ALE should be wired high. In multiplexed bus applications (
Figure 17-4
), A[5:0]
should be wired to D[5:0] and the falling edge of ALE latches the address.
SYMBOL
t1
t2
t3
t4
MIN
0
0
0
TYP
MAX
65
UNITS
ns
ns
ns
ns
t5
2
20
ns
t6
t7
t8
t9
t10
t11
t12
t13
65
10
2
5
75
10
10
30
ns
ns
ns
ns
ns
ns
ns
ns
t14
0
ns
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