Datasheet

TL16C554A, TL16C554AI
ASYNCHRONOUS-COMMUNICATIONS ELEMENT


SLLS509E − AUGUST 2001 − REVISED JUNE 2010
10
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
read cycle timing requirements over recommended ranges of operating free-air temperature and
supply voltage (see Figure 4)
MIN MAX UNIT
t
w4
Pulse duration, IOR low 75 ns
t
su1
Setup time, CSx valid before IOR low (see Note 2) 10 ns
t
su2
Setup time, A2 −A0 valid before IOR low (see Note 2) 15 ns
t
h1
Hold time, A2 −A0 valid after IOR high (see Note 2) 0 ns
t
h2
Hold time, CSx valid after IOR high (see Note 2) 0 ns
t
d1
Delay time, t
su2
+ t
w4
+ t
d2
(see Note 3) 140 ns
t
d2
Delay time, IOR high to IOR or IOW low 50 ns
NOTES: 2. The internal address strobe is always active.
3. In the 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 Figure 5)
MIN MAX UNIT
t
w5
Pulse duration, IOW↓ 50 ns
t
su3
Setup time, CSx valid before IOW↓ (see Note 2) 10 ns
t
su4
Setup time, A2 −A0 valid before IOW↓ (see Note 2) 15 ns
t
su5
Setup time, D7 −D0 valid before IOW↑ 10 ns
t
h3
Hold time, A2 −A0 valid after IOW↑ (see Note 2) 5 ns
t
h4
Hold time, CSx valid after IOW↑ (see Note 2) 5 ns
t
h5
Hold time, D7 −D0 valid after IOW↑ 25 ns
t
d3
Delay time, t
su4
+ t
w5
+ t
d4
120 ns
t
d4
Delay time, IOW↑ to IOW or IOR↓ 55 ns
NOTE 2: 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 4 and Figure 4)
PARAMETER MIN MAX UNIT
t
en
Enable time, IOR↓ to D7−D0 valid 30 ns
t
dis
Disable time, IOR↑ to D7 −D0 released 0 20 ns
NOTE 4: V
OL
and V
OH
(and the external loading) determine the charge and discharge time.