Appendix 2 - 12

-55

°C < T

Notes:

1. All tests guaranteed per test figure 6.

2. Guaranteed by device characterization.

3. Supplied as a design limit but not guaranteed or tested.

4. Delay time from transmit inhibit (1.5V) rising to transmit off (280mV).

5. Delay time from not transmit inhibit (1.5V) falling to transmit off (1.2V).

SYMBOL

PARAMETER

MINIMUM

MAXIMUM

UNIT

CONDITION

Transmitter output rise/

fall time (see figure 10)

100

300

ns

Input

ƒ = 1MHz 50% duty cycle:

at 10% through 90% points TXOUT,

TXOUT. Figure 10.

RXOUT delay

-200

200

ns

RXOUT to RXOUT, Figure 4.

3

TXIN skew

-25

25

ns

TXIN to TXIN, Figure 3.

Zero crossing distortion

(see figure 11)

-150

150

ns

Direct-coupled stub; input

ƒ = 1MHz,

time 200ns.

Zero crossing stability

(see figure 11)

-25

25

ns

Input TXIN and TXIN should create

Transmitter output zero crossings at

500ns, 1000ns, 1500ns, and 2000ns.

These zero crossings should not

deviate more than

±25ns.

3,4

Transmitter off; delay

from inhibit active

100

ns

TXIN and TXIN toggling @ 1MHz;

TXIHB transitions from logic zero to

one, see figure 12.

3,5

Transmitter on; delay

from inhibit inactive

150

ns

TXIN and TXIN toggling @ 1MHz;

TXIHB transitions from logic one to

zero, see figure 13.

3

Receiver off

50

ns

Receiver turn off time, see figure 13.

3

Receiver on

50

ns

Receiver turn on time, see figure 13.

3

Receiver propagation

450

ns

Receiver propagation delay, see

figure 13.

3

Transmitter

propagation

200

ns

Transmitter propagation delay, see

figure 12.

Table 2. Transformer Requirements

COUPLING TECHNIQUE

± 5V

DC

DIRECT-COUPLED:

Isolation Transformer Ratio

2.5:1

TRANSFORMER-COUPLED:

Isolation Transformer Ratio

1.79:1

Coupling Transformer Ratio

1:1.4