THVD1500 Datasheet, PDF (10/29 Pages) Texas Instruments – 300 kbps RS-485 Transceivers With 8-kV IEC ESD Protection

THVD1500
SLLSEY4 – JULY 2017
7 Parameter Measurement Information
Vcc
DE
D
0V or V_cc
A
VOD
B
375 Ÿ
RL
V_test
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375 Ÿ
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Figure 8. Measurement of Driver Differential Output Voltage With Common-Mode Load
0V or Vcc ^D
A
VOD
B
R_L/2
R_L/2
C_L ^VOC
A
B
VOC
V_OC(PP)
VA
VB
ûV_OC(SS)
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Figure 9. Measurement of Driver Differential and Common-Mode Output With RS-485 Load
Input
Generator
Vcc
DE
D
VI ^{50 Ÿ}
A
VOD
B
R_L=
54 Ÿ
C_L= 50 pF
VI
t_PLH
VOD
50%
90%
50%
10%
t_r
V_cc
t_PHL
0V
~2 V
t_f
~ ^±2V
Copyright © 2017, Texas Instruments Incorporated
Figure 10. Measurement of Driver Differential Output Rise and Fall Times and Propagation Delays
D
DE
Input
Generator V_I ^{50 Ÿ}
A _S1
VO
B
C_L ⁼
50 pF
R_L =
110 Ÿ
VI
t_PZH
VO
Vcc
50%
0V
50%
90% ^VOH
t_PHZ
~~ _0V
Copyright © 2017, Texas Instruments Incorporated
Figure 11. Measurement of Driver Enable and Disable Times With Active High Output and Pull-Down
Load
Input
Generator
D
DE
VI
50 Ÿ
Vcc
A
S1
B
RL= 110 Ÿ
VO
CL=
50 pF
VI
tPZL
VO
50 %
tPLZ
Vcc
0V
§ Vcc
50 %
10%
VOL
Copyright © 2017, Texas Instruments Incorporated
Figure 12. Measurement of Driver Enable and Disable Times With Active Low Output and Pull-up Load
10
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