TL16C552A Datasheet, PDF (8/39 Pages) Texas Instruments – DUAL ASYNCHRONOUS COMMUNICATIONS ELEMENT WITH FIFO

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 MAX UNIT
tw4
Pulse duration, IOR ↓
tsu1
Setup time, CSx valid before IOR ↓ (see Note 5)
tsu2
Setup time, A2 – A0 valid before IOR ↓ (see Note 5)
th1
Hold time, A2 – A0 valid after IOR ↑ (see Note 5)
th2
Hold time, CSx valid after IOR ↑ (see Note 5)
td1
Delay time, tsu2 + tw4 + td2 (see Note 6)
td2
Delay time, IOR ↑ to IOR or IOW ↓
80
ns
15
ns
15
ns
20
ns
20
ns
175
ns
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)
tw5 Pulse duration, IOW ↓
tsu4 Setup time, CSx valid before IOW ↓ (see Note 8)
tsu5 Setup time, A2 – A0 valid before IOW ↓ (see Note 8)
tsu6 Setup time, DB0 – DB7 valid before IOW ↑
th3 Hold time, A2 – A0 valid after IOW ↑ (see Note 8)
th4 Hold time, CSx valid after IOW ↑ (see Note 8)
th5 Hold time, DB0 – DB7 valid after IOW ↑
td3 Delay time, tsu5 + tw5 + td4
td4 Delay time, IOW ↑ to IOW or IOR ↓
NOTES: 7. These parameters are not production tested.
8. The internal address strobe is always active.
MIN MAX UNIT
80
ns
15
ns
15
ns
15
ns
20
ns
20
ns
15
ns
175
ns
80
ns
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 Propagation delay time from IOR ↓ to BDO ↑ or from IOR ↑ to BDO ↓
ten Enable time from IOR ↓ to DB0 – DB7 valid (see Note 10)
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.
MIN MAX UNIT
60 ns
60 ns
60 ns
8
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