MAX14780E Datasheet, PDF (4/14 Pages) Maxim Integrated Products – 5.0V, 30kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceiver

+5.0V, ±30kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceiver
RECEIVER SWITCHING CHARACTERISTICS WITH INTERNAL SRL (500kbps)
(VCC = +5.0V ±10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5.0V and TA = +25NC.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
Receiver Propagation Delay
tRPLH
tRPHL
CL = 15pF, Figures 6 and 7
Receiver Output Skew
|tRPLH - tRPHL|
tRSKEW CL = 15pF, Figures 6 and 7
Maximum Data Rate
Receiver Enable to Output Low
tRZL Figure 8
Receiver Enable to Output High
tRZH Figure 8
Receiver Disable Time from Low
tRLZ Figure 8
Receiver Disable Time from High tRHZ Figure 8
Receiver Enable from Shutdown
to Output High
tRZH(SHDN) Figure 8
MIN TYP MAX UNITS
200
ns
200
30
ns
500
kbps
50
ns
50
ns
50
ns
50
ns
5500
ns
Receiver Enable from Shutdown
to Output Low
tRZL(SHDN) Figure 8
5500
ns
Time to Shutdown
tSHDN
50
340 700
ns
Note 1: All currents into the device are positive. All currents out of the device are negative. All voltages are referred to device
ground, unless otherwise noted.
Note 2: ΔVOD and ΔVOC are the changes in VOD and VOC, respectively, when the DI input changes state.
Note 3: The short-circuit output current applies to peak current just prior to foldback current limiting. The short-circuit foldback
output current applies during current limiting to allow a recovery from bus contention.
B
VOD
A
RL/2
R_L/2
VOC
Figure 1. Driver DC Test Load
V_CC
DE
B
DI
VOD
A
RL
CL
Test Circuits and Waveforms
V_CC
DI
0
VCC/2
Z
Y
VO
V_{DIFF 0}
-V_O
VO
1/2 VO
10%
t_R
t_DPLH
tDPHL
VDIFF = V (B) - V (A)
90%
90%
t_F
tSKEW = | tDPLH - tDPHL |
Figure 3. Driver Propagation Delays
1/2 V_O
10%
Figure 2. Driver Timing Test Circuit
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