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SN74ACT8990FNR Arkusz danych(PDF) 8 Page - Texas Instruments

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Numer części SN74ACT8990FNR
Szczegółowy opis  TEST-BUS CONTROLLERS IEEE STD 1149.1 JTAG TAP MASTERS WITH 16-BIT GENERIC HOST INTERFACES
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Strona internetowa  http://www.ti.com
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SN74ACT8990FNR Arkusz danych(HTML) 8 Page - Texas Instruments

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SN54ACT8990, SN74ACT8990
TEST-BUS CONTROLLERS
IEEE STD 1149.1 (JTAG) TAP MASTERS WITH 16-BIT GENERIC HOST INTERFACES
SCAS190E – JUNE 1990 – REVISED JANUARY 1997
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
timing requirements over recommended ranges of supply voltage and operating free-air
temperature (see Figure 1)
SN54ACT8990
SN74ACT8990
UNIT
MIN
MAX
MIN
MAX
UNIT
fclock
Clock frequency
0
30
0
30
MHz
RD low†
5.5
ns
WR low
5.5
5.5
tw
Pulse duration
EVENT high or low
8
8
ns
TCKI high or low
10.5
10.5
ns
TRST low
6
6
ADRS† before RD
6.5
ns
ADRS before WR
6.5
6.5
DATA before WR
6
6
tsu
Setup time
EVENT before TCKI
6
5.5
ns
EVENT before TCKI
5
5
ns
TDI before TCKI
2
2
TDI before TCKI
2
2
ADRS† after RD
5
ns
ADRS after WR
5.5
5
DATA after WR
5.5
5.5
th
Hold time
EVENT after TCKI
5.5
5
ns
EVENT after TCKI
5
5
ns
TDI after TCKI
4
2.5
TDI after TCKI
4
2.5
† Applies only in the case where ADRS (4-0) = 10110 (read buffer).


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