SP339E
REV. 1.0.0
RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION
TIMING CHARACTERISTICS (Continued)
UNLESS OTHERWISE NOTED:
VCC = +3.3V ±5% or +5.0V ±5%, C1-C4 = 0.1µF; TA = TMIN to TMAX. Typical values are at VCC = 3.3V, TA = +25°C.
SYMBOL
PARAMETERS
MIN.
TYP.
MAX. UNITS
CONDITIONS
RS-485/RS-422, DATA RATE = 250kbps (SLEW = Vcc), ONE TRANSMITTER SWITCHING
RL = 54Ω, CL = 50pF
Maximum Data Rate
250
kbps
ns
tRPHL, tRPLH
Receiver Propagation Delay
Receiver Propagation Delay Skew
Driver Propagation Delay
Driver Propagation Delay Skew
Driver Rise and Fall Time
50
150
20
CL = 15pF, Figure 11
⏐tRPHL-tRPLH
⏐
ns
tDPHL, tDPLH
500
650
1000
100
ns
RL = 54Ω, CL = 50pF,
⏐tDPHL-tDPLH
⏐
ns
Figure 12
tDR, DF
t
300
1200
ns
tRZH, tRZL
tRHZ, tRLZ
tDZH, tDZL
tDHZ, tDLZ
Receiver Output Enable Time
Receiver Output Disable Time
Driver Output Enable Time
Driver Output Disable Time
200
200
ns
ns
ns
ns
Figure 13
Figure 14
1000
200
RS-485/RS-422, DATA RATE = 20Mbps (SLEW = 0V), ONE TRANSMITTER SWITCHING
RL = 54Ω, CL = 50pF
Maximum Data Rate
20
Mbps
ns
tRPHL, tRPLH
Receiver Propagation Delay
Receiver Propagation Delay Skew
Driver Propagation Delay
Driver Propagation Delay Skew
Driver Rise and Fall Time
50
30
10
150
10
CL = 15pF, Figure 11
⏐tRPHL-tRPLH
⏐
ns
tDPHL, tDPLH
100
10
ns
RL = 54Ω, CL = 50pF,
⏐tDPHL-tDPLH
⏐
ns
Figure 12
tDR, DF
t
20
ns
tRZH, tRZL
tRHZ, tRLZ
tDZH, tDZL
tDHZ, tDLZ
Receiver Output Enable Time
Receiver Output Disable Time
Driver Output Enable Time
Driver Output Disable Time
200
200
200
200
ns
ns
ns
ns
Figure 13
Figure 14
9
EXAR [ EXAR CORPORATION ]
