SP337EBEY-L Datasheet, PDF (12/18 Pages) Exar Corporation – 3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER

SP337E
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
FIGURE 13. RS-485 RECEIVER ENABLE AND DISABLE TIMES TEST CIRCUIT
OUT
1.5V
S3
A
S1
1kΩ
-1.5V
BR
S2
GENERATOR
RE
50Ω
C_L= 15pF
REV. 1.0.2
Vcc
FIGURE 14. RS-485 RECEIVER ENABLE AND DISABLE TIMES TIMING DIAGRAM 1
S1 is open, S2 is closed, S3 = 1.5V
3V
RE
1.5V
t ZH
VOH
OUT
VOH /2
0V
FIGURE 15. RS-485 RECEIVER ENABLE AND DISABLE TIMES TIMING DIAGRAM 2
S1 is closed, S2 is open, S3 = -1.5V
3V
RE
1.5V
0V
t ZL
VCC
OUT
VOL= VCC /2
VOL
12