TL16C552A, TL16C552AM
DUAL ASYNCHRONOUS COMMUNICATIONS ELEMENT
WITH FIFO
SLLS189D – NOVEMBER 1994 – REVISED JANUARY 1999
read cycle timing requirements over recommended ranges of operating free-air temperature and
supply voltage (see Note 4 and Figure 4)
MIN
tw4
tsu1
tsu2
th1
th2
td1
Pulse duration, IOR
↓
Setup time, CSx valid before IOR
↓
(see Note 5)
Setup time, A2 – A0 valid before IOR
↓
(see Note 5)
Hold time, A2 – A0 valid after IOR
↑
(see Note 5)
Hold time, CSx valid after IOR
↑
(see Note 5)
Delay time, tsu2 + tw4 + td2 (see Note 6)
80
15
15
20
20
175
MAX
UNIT
ns
ns
ns
ns
ns
ns
td2
Delay time, IOR
↑
to IOR or IOW
↓
80
ns
NOTES: 4. These parameters are not production tested.
5. The internal address strobe is always active.
6. In FIFO mode, td1 = 425 ns (min) between reads of the receiver FIFO and the status registers (interrupt identification register and
line status register).
write cycle timing requirements over recommended ranges of operating free-air temperature and
supply voltage (see Note 7 and Figure 5)
MIN
tw5
tsu4
tsu5
tsu6
th3
th4
th5
td3
Pulse duration, IOW
↓
Setup time, CSx valid before IOW
↓
(see Note 8)
Setup time, A2 – A0 valid before IOW
↓
(see Note 8)
Setup time, DB0 – DB7 valid before IOW
↑
Hold time, A2 – A0 valid after IOW
↑
(see Note 8)
Hold time, CSx valid after IOW
↑
(see Note 8)
Hold time, DB0 – DB7 valid after IOW
↑
Delay time, tsu5 + tw5 + td4
80
15
15
15
20
20
15
175
80
MAX
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
td4
Delay time, IOW
↑
to IOW or IOR
↓
NOTES: 7. These parameters are not production tested.
8. The internal address strobe is always active.
read cycle switching characteristics over recommended ranges of operating free-air temperature
and supply voltage, C
L
= 100 pF (see Note 9 and Figure 4)
PARAMETER
tpd1
ten
Propagation delay time from IOR
↓
to BDO
↑
or from IOR
↑
to BDO
↓
Enable time from IOR
↓
to DB0 – DB7 valid (see Note 10)
MIN
MAX
60
60
60
UNIT
ns
ns
ns
tdis
Disable time from IOR
↑
to DB0 – DB7 released (see Note 10)
NOTES: 9. These parameters are not production tested.
10. VOL and VOH (and the external loading) determine the charge and discharge time.
8
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