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XR3170E Datasheet, PDF (8/24 Pages) Exar Corporation – 3.3V High Speed RS-485/RS-422 TRANSCEIVERS WITH 1/8 UNIT LOAD
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XR3170E-3178E
3.3V HIGH SPEED RS-485/RS-422 TRANSCEIVERS WITH 1/8th UNIT LOAD
REV. 1.0.0
UNLESS OTHERWISE NOTED: VCC = +3.0V TO +3.6V WITH TA FROM -40OC TO +85OC. TYPICAL VALUES ARE AT
VCC = +3.3V AND 25OC.
SYMBOL
PARAMETERS
MIN. TYP. MAX. UNITS
CONDITIONS
tLZ
Receiver Disable from Output Low
50
ns CL = 15pF, Figure 14
tZH(SHDN) Shutdown to Receiver Output Valid
High
3500 ns CL = 15pF, Figure 14
tZL(SHDN) Shutdown to Receiver Output Valid
Low
3500 ns CL = 15pF, Figure 14
tSHDN
Time to Shutdown
50 200 600 ns Notes 3 and 4
XR3176E, XR3177E and XR3178E
DRIVER AC CHARACTERISTICS
freq
Max. Data Signaling Rate
20
Mbps 1/tUI, Duty Cycle 40 to 60%
tPLH
Driver Propagation Delay (Low to
High)
4
12
40
ns CL = 50pF, RL = 54Ω, Figures 6
and 7
tPHL
Driver Propagation Delay (High to
Low)
4
12
40
ns CL = 50pF, RL = 54Ω, Figures 6
and 7
tR
Driver Rise Time
2
3
10
ns CL = 50pF, RL = 54Ω, Figures 6
and 7
tF
Driver Fall Time
2
3
10
ns CL = 50pF, RL = 54Ω, Figures 6
and 7
|tPLH-tPHL| Differential Pulse Skew
5
ns Figures 6 and 7
tZH
Driver Enable to Output High
150 ns CL = 50pF, RL = 500Ω, Figures
8 and 9
tZL
Driver Enable to Output Low
150 ns CL = 50pF, RL = 500Ω, Figures
10 and 11
tHZ
Driver Disable from Output High
150 ns CL = 50pF, RL = 500Ω, Figures
8 and 9
tLZ
Driver Disable from Output Low
150 ns CL = 50pF, RL = 500Ω, Figures
10 and 11
tOZV
Shutdown to Driver Output Valid
3500 ns CL = 50pF, RL = 500Ω
tSHDN
Time to Shutdown
50 200 600 ns Notes 3 and 4
RECEIVER AC CHARACTERISTICS
freq
Data Signaling Rate
20
Mbps 1/tUI, Duty Cycle 40 to 60%
tPLH
Receiver Propagation Delay (Low to 4
22
40
ns VID = +/-2V, CL = 15pF, Figures
High)
12 and 13
tPHL
Receiver Propagation Delay (High to 4
22
40
ns VID = +/-2V, CL = 15pF, Figures
Low)
12 and 13
skew
Receiver Propagation Delay Skew
5
ns VID = +/-2V, CL = 15pF, Figures
12 and 13
skew = |tPLH-tPHL|
tR
Receiver Output Rise Time
3
6
ns CL = 15pF
8
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