TL16C552A, TL16C552AM

DUAL ASYNCHRONOUS COMMUNICATIONS ELEMENT

WITH FIFO

SLLS189D – NOVEMBER 1994 – REVISED JANUARY 1999

8

POST OFFICE BOX 655303

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

↓

80

ns

tsu1

Setup time, CSx valid before IOR

↓ (see Note 5)

15

ns

tsu2

Setup time, A2 – A0 valid before IOR

↓ (see Note 5)

15

ns

th1

Hold time, A2 – A0 valid after IOR

↑ (see Note 5)

20

ns

th2

Hold time, CSx valid after IOR

↑ (see Note 5)

20

ns

td1

Delay time, tsu2 + tw4 + td2 (see Note 6)

175

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

MAX

UNIT

tw5

Pulse duration, IOW

↓

80

ns

tsu4

Setup time, CSx valid before IOW

↓ (see Note 8)

15

ns

tsu5

Setup time, A2 – A0 valid before IOW

↓ (see Note 8)

15

ns

tsu6

Setup time, DB0 – DB7 valid before IOW

↑

15

ns

th3

Hold time, A2 – A0 valid after IOW

↑ (see Note 8)

20

ns

th4

Hold time, CSx valid after IOW

↑ (see Note 8)

20

ns

th5

Hold time, DB0 – DB7 valid after IOW

↑

15

ns

td3

Delay time, tsu5 + tw5 + td4

175

ns

td4

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

PARAMETER

MIN

MAX

UNIT

tpd1

Propagation delay time from IOR

↓ to BDO ↑ or from IOR ↑ to BDO ↓

60

ns

ten

Enable time from IOR

↓ to DB0–DB7 valid (see Note 10)

60

ns

tdis

Disable time from IOR

↑ to DB0–DB7 released (see Note 10)

60

ns

NOTES:

9. These parameters are not production tested.

10. VOL and VOH (and the external loading) determine the charge and discharge time.