SP508E Datasheet, PDF (16/29 Pages) Exar Corporation – Rugged 20Mbps, 8 Channel Multi-Protocol Transceiver with Programmable DCE/DTE and Termination Resistors

Output
500
Under
Test _CL
S₁
V_CC
S₂
Figure 34. Driver Timing Test Load Circuit
Receiver
Test Point
1K
Output
S₁
V_CC
C_RL
1K
S₂
Figure 35. Receiver Timing Test Load Circuit
DRIVER ^+3V
INPUT _0V
A
DRIVER
OUTPUT _B
DIFFERENTIAL V_O+
OUTPUT 0V
V_B – V_A VO^–
f > 10MHz; t_R < 10ns; t_F < 10ns
1.5V
t_PLH
V_O ^1/2VO
t_PHL
1.5V
t_DPLH
t_DPHL
t_R
t_{SKEW = |} t_{DPLH -} t_{DPHL |}
Figure 36. Driver Propagation Delays
1/2V_O
t_F
Mx or Tx_Enable +3V
0V
5V
A, B
V_OL
V_OH
A, B
0V
1.5V
t_ZL
2.3V _{Output normally LOW}
2.3V
t_ZH
Output normally HIGH
Figure 37. Driver Enable and Disable Times
1.5V
t_LZ
0.5V
0.5V
t_HZ
A–B
V_0D2⁺
V_0D2^–
V_OH
RECEIVER OUT
V_OL
t_{SKEW = |} t_{PHL -} t_{PLH |}
t_PLH
f > 10MHz; t_R < 10ns; t_F < 10ns
0V
INPUT
OUTPUT
(VOH - VOL)/2
t_PHL
0V
(VOH - VOL)/2
Figure 38. Receiver Propagation Delays
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.comSP508E_100_072412
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