THVD1500 Datasheet, PDF (11/29 Pages) Texas Instruments – 300 kbps RS-485 Transceivers With 8-kV IEC ESD Protection

www.ti.com
Parameter Measurement Information (continued)
VCC
THVD1500
SLLSEY4 – JULY 2017
RE
VCC
DE
A
DI
B
A
RO
GND
RS-485
GND
GND
Figure 13. Measurement of Receiver Output Short Circuit Current
VCC
V
GND
RE
VCC
DE
A
DI
B
RO
GND
RS-485
V
V
GND
12 ( 7)
R _A , R _{B | I Va | | I Vb |}
Figure 14. Measurement of Bus Impedance
A
Input
Generator
VI
50 Ÿ
1.5V
B
RE
0V
R VO
CL=15 pF
VI
tPLH
VOD
tr
50 %
90%
50%
10 %
3V
0V
tPHL
VOH
tf
VOL
Copyright © 2017, Texas Instruments Incorporated
Figure 15. Measurement of Receiver Output Rise and Fall Times and Propagation Delays
Vcc
DE
A
D
0V or Vcc
B
Input
Generator
VI
50 Ÿ
R VO
1 kŸ
CL=15 pF
RE
Vcc
S1
VI
tPZH(1)
VO
tPZL(1)
VO
Vcc
50 %
0V
tPHZ
50 %
90 %
VOH
D at Vcc
S1 to GND
§ 0V
tPLZ
50 %
10 %
VCC
VOL
D at 0V
S1 to Vcc
Copyright © 2017, Texas Instruments Incorporated
Figure 16. Measurement of Receiver Enable/Disable Times With Driver Enabled
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: THVD1500
Submit Documentation Feedback
11