MAX13487E Datasheet, PDF (9/17 Pages) Maxim Integrated Products – Half-Duplex RS-485-/RS-422-Compatible Transceiver with AutoDirection Control

Half-Duplex RS-485-/RS-422-Compatible
Transceiver with AutoDirection Control
Test Circuits and Waveforms (continued)
OUTPUT
UNDER TEST
500Ω
C_L
V_CC
SHDN
0
A, B
S₁
V_CC
V_OL
S₂
A, B
0
Figure 4. Driver Enable and Disable Times
1.5V
t_DZL(SHDN)
2.3VOUTPUT _{NORMALLY LOW}
OUTPUT NORMALLY HIGH
2.3V
t_DZH(SHDN)
ATE
V_ID
B
R
A
RECEIVER
OUTPUT
Figure 5. Receiver-Propagation-Delay Test Circuit
A
B
V_OH
RO
V_OL
f = 1MHz, t_LH ≤ 3ns, t_HL ≤ 3ns
1V
-1V
t_RPHL
t_RPLH
1.5V
1.5V
t_RSKEW = _| t_RPHL - t_{RPLH |}
Figure 6. Receiver Propagation Delays
_______________________________________________________________________________________ 9