SP3490EN-L-TR Datasheet, PDF (8/12 Pages) Exar Corporation – +3.3V Low Power Full-Duplex RS-485 Transceivers with 10Mbps Data Rate

3V
INPUT
0V
VOH
Y OUTPUT
VOL
1.5V
tPLH
VOM
1.5V
tPHL
VOM
VOH
Z OUTPUT
VOL
tPHL
VOM
tPLH
VOM
VOM =
VOH + VOL
2
≈ 1.5V
Figure 9. Driver Propagation Delay Waveforms
3V
DE
0V
VOH
OUTPUT
HIGH
0V
VCC
OUTPUT
LOW
VOL
1.5V
tPZH
VOM
1.5V
tPHZ
0.25V
tPZL
VOM
tPLZ
0.25V
VOM =
VOH + VOL
2
≈ 1.5V
Figure 11. Driver Enable and Disable Timing
Waveforms
SWITCHING WAVEFORMS
IN
1.5V
t DO1
OUT
50%
10%
90%
tTD
1.5V
t DO2
90%
50%
10%
tTD
3V
0V
2.0V
-2.0V
Figure 10. Driver Differential Output Delay and
Transition Time Waveforms
3V
INPUT
0V
VCC
OUTPUT
0V
1.5V
1.5V
tRPLH
VOM
tRPHL
VOM
VOM =
VCC
2
Figure 12. Receiver Propagation Delay Waveforms
3V
REB
0V
VOH
OUTPUT
0V
S1 is open
S2 is closed
S3 = 1.5V
1.5V
1.5V
tPRHZ
10%
tPRZH
tPRSH
1.5V
Figure 13. Receiver Enable and Disable Waveforms
3V
REB
0V
VCC
OUTPUT
VOL
S1 is closed
S2 is open
S3 = -1.5V
1.5V
1.5V
tPRLZ
10%
tPRZL
tPRSL
1.5V
NOTE 1: The input pulse is supplied by a generator with the following characteristics:
PRR = 250kHz, 50% duty cycle, t_R < 6.0ns, Z_O = 50Ω.
NOTE 2: C_L includes probe and stray capacitance.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

SP3490_3491_102_102710