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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com

SP3490_349_02_0270

TEST CIRCUITS

R

R

V

OC

D

Vcc

V

OD

Figure . Driver DC Test Load Circuit

GENERATOR

(NOTE 1)

50Ω

C

L

OUT

D

R

60Ω

Figure 3. Driver Differential Output Delay and

Transition Time Circuit.

GENERATOR

(NOTE 1)

50Ω

S1

OUT

(NOTE 2)

≈ 1.5V

2

D

Figure 4. Driver Enable and Disable Timing Circuit,

Output High

Figure 2. Driver Propagation Delay Test Circuit

GENERATOR

(NOTE 1)

50Ω

S1

OUT

(NOTE 2)

≈ 1.5V

2

D

Figure 5. Driver Enable and Disable Timing Circuit,

Output Low

GENERATOR

(NOTE 1)

50Ω

S1

OUT

(NOTE 2)

D

0V OR 3V

GENERATOR

(NOTE 1)

50Ω

1.5V

0V

R

OUT

(NOTE 2)

2

Figure 6. Receiver Propagation Delay Test Circuit

1.5V

-1.5V

S3

GENERATOR

(NOTE 1)

50Ω

(NOTE 2)

R

1k

S1

S2

A/Y

D

DI = 0 or Vcc

B/Z

DE = 0 or Vcc

100Ω

-7V to +12V V

Figure 7. Receiver Enable and Disable Timing

Circuit

Figure 8. Driver Short Circuit Current Limit Test