參數(shù)資料
型號(hào): TP3420A
廠(chǎng)商: National Semiconductor Corporation
英文描述: ISDN S/T Interface Device
中文描述: 綜合業(yè)務(wù)數(shù)字網(wǎng)的S / T接口設(shè)備
文件頁(yè)數(shù): 26/32頁(yè)
文件大?。?/td> 524K
代理商: TP3420A
Timing Characteristics
(Continued)
Symbol
DIGITAL SYSTEM INTERFACE (See
Figure 9
)
t
HCFH
Hold Time, BCLK High
to FS
a
and FS
b
High (Inputs)
t
SFC
Set up Time, FS
a
and
FSb Inputs to BCLK Low
t
HCFL
Hold Time, BCLK Low
to FS
a
and FS
b
Low (Inputs)
t
DBFR
Delay Time, FS
b
Input
to B
r
Valid
t
DBF
Delay Time, BCLK High
to FS
a
and FS
b
Transitions
(Outputs)
t
DCB
Delay Time, BCLK
High to Data Valid
t
DCBZ
Delay Time, BCLK Low
to Data Invalid
t
DCD
Delay Time, BCLK
High to DEN
x
Transition
Parameter
Conditions
Min
Typ
Max
Units
NT and TES Modes
only
NT and TES Modes
only
NT and TES Modes
only
NT and TES Modes,
Bit 1 only
TEM mode only
0
ns
50
ns
20
ns
80
ns
50
ns
All Modes
80
ns
All Modes
(Last Bit Only)
TEM Mode only
10
120
ns
(Note 28)
40
ns
Note 28:
This parameter can be extended by connecting a 10 k
pull-up resistor and a 10 pf pull-down capacitor to B
r
.
Timing Diagrams
DS009143-9
FIGURE 9. Timing Details for Digital System Interface
www.national.com
26
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