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MAX13450E Datasheet, PDF (9/17 Pages) Maxim Integrated Products – RS-485 Transceivers with Integrated 100Ω/120Ω Termination Resistors | |||
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RS-485 Transceivers with Integrated
100â¦/120⦠Termination Resistors
Test Circuits and Waveforms (continued)
VL
DE
0V
VCC
A/Y, B/Z
VOL
VOH
A/Y, B/Z
0V
Figure 4. Driver Enable and Disable Times
VL/2
VL/2
tDZL(SHDN),tDZL
tDLZ
(VCC + VOL)/2 OUTPUT NORMALLY LOW
VOH/2
OUTPUT NORMALLY HIGH
tDZH(SHDN),tDZH
tDHZ
VOL + 0.25V
VOH - 0.25V
OUTPUT
UNDER TEST
500â¦
CL
VCC
S1
S2
Figure 5. Driver-Enable and Disable-Timing Test Load
B
ATE
VID
R
RECEIVER
OUTPUT
A
Figure 6. Receiver Propagation Delay Test Circuit
A
B
VROH
RO
VROL
f = 1MHz, tLH ⤠3ns, tHL ⤠3ns
1V
-1V
tRPHL
tRPLH
VL/2
VL/2
tRSKEW = |tRPHL - tRPLH|
Figure 7. Receiver Propagation Delays
_______________________________________________________________________________________ââ 9
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