Datasheet

TL16C552A, TL16C552AM
DUAL ASYNCHRONOUS COMMUNICATIONS ELEMENT
WITH FIFO
SLLS189D – NOVEMBER 1994 – REVISED JANUARY 1999
8
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
read cycle timing requirements over recommended ranges of operating free-air temperature and
supply voltage (see Note 4 and Figure 4)
MIN MAX UNIT
t
w4
Pulse duration, IOR 80 ns
t
su1
Setup time, CSx valid before IOR (see Note 5) 15 ns
t
su2
Setup time, A2A0 valid before IOR (see Note 5) 15 ns
t
h1
Hold time, A2A0 valid after IOR (see Note 5) 20 ns
t
h2
Hold time, CSx valid after IOR (see Note 5) 20 ns
t
d1
Delay time, t
su2
+ t
w4
+ t
d2
(see Note 6) 175 ns
t
d2
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, t
d1
= 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 MAX UNIT
t
w5
Pulse duration, IOW 80 ns
t
su4
Setup time, CSx valid before IOW (see Note 8) 15 ns
t
su5
Setup time, A2A0 valid before IOW (see Note 8) 15 ns
t
su6
Setup time, DB0 DB7 valid before IOW 15 ns
t
h3
Hold time, A2 A0 valid after IOW (see Note 8) 20 ns
t
h4
Hold time, CSx valid after IOW (see Note 8) 20 ns
t
h5
Hold time, DB0 DB7 valid after IOW 15 ns
t
d3
Delay time, t
su5
+ t
w5
+ t
d4
175 ns
t
d4
Delay time, IOW to IOW or IOR 80 ns
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 MIN MAX UNIT
t
pd1
Propagation delay time from IOR to BDO or from IOR to BDO 60 ns
t
en
Enable time from IOR to DB0DB7 valid (see Note 10) 60 ns
t
dis
Disable time from IOR to DB0DB7 released (see Note 10) 60 ns
NOTES: 9. These parameters are not production tested.
10. V
OL
and V
OH
(and the external loading) determine the charge and discharge time.