TNETEL1200

EtherLoop

™ MODEM

SPHS003D – FEBRUARY 1999 – REVISED JUNE 1999

14

POST OFFICE BOX 655303

timing requirements over recommended ranges of supply voltage and operating free-air

temperature

A2D interface (see Figure 5)

NO.

MIN

MAX

UNIT

1

tw

Pulse duration, A2DCLK high

70

ns

2

tw

Pulse duration, A2DCLK low

70

ns

3

tc

Cycle time, A2DCLK

150

ns

4

tsu

Setup time, A2D data before A2DCLK

↓

10

ns

5

th

Hold time, A2D data after A2DCLK

↓

15

ns

4

5

1

2

3

A2D Data

A2DCLK

Figure 5. A2D Interface

D2A interface (see Figure 6)

NO.

MIN

MAX

UNIT

1

tw

Pulse duration, D2ACLK high

75

ns

2

tw

Pulse duration, D2ACLK low

25

ns

3

tc

Cycle time, D2ACLK

100

ns

4

tpd

Propagation delay time from D2ACLK

↓

5

ns

3

D2A Data

D2ACLK

1

2

4

Figure 6. D2A Interface