SP3070E Datasheet, PDF (11/20 Pages) Exar Corporation – ±15kV ESD-Protected, 3.3V, 1/8 Load, Failsafe RS-485/RS422 Transceivers

figure 7. receiver enable & disable times test circuit
1.5V
-1.5V
S3
B
AR
RE
GENERATOR
50Ω
1kΩ
CL = 15pF
S1
VCC
S2
figure 8. receiver enable & disable timing diagram
S1 is open S2 is closed S3 = 1.5V
3V
RE
1.5V
t t ZH, ZH(SHDN)
VOH
OUT
VOH/2
0V
S1 is closed, S2 is open, S3 = -1.5V
3V
RE
1.5V
t t ZL, ZL(SHDN)
0V
OUT
VOL = VCC/2
VCC
VOL
S1 is open S2 is closed S3 = 1.5V
3V
RE
1.5V
tHZ
0.25V
VOH
OUT
0V
S1 is closed, S2 is open, S3 = -1.5V
RE
1.5V
t LZ
3V
0V
VCC
OUT
0.25V
VOL
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
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SP3070E-SP3078E_100_061109