Rainbow Electronics MAX3430 - Manual (Page 4)

MAX3430
±80V Fault-Protected, Fail-Safe,
1/4-Unit Load, +3.3V RS-485 Transceiver
4 _______________________________________________________________________________________
DRIVER SWITCHING CHARACTERISTICS
(V CC = +3.3V ±10%, T
A = T MIN to T MAX , unless otherwise noted. Typical values are at V CC = +3.3V and T A = +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
t DPLH 700 1500
Driver Propagation Delay
t DPHL
Figures 2 and 3, R L = 54 Ω, C
L = 50pF
700 1500
ns
Driver Differential Output Rise or
Fall Time
t DR, t DF Figures 2 and 3, R L = 54 Ω, C
L = 50pF 250 1200 ns
Differential Driver Output Skew,
|t
DPLH - t DPHL |
t DSKEW Figures 2 and 3, R L = 54 Ω, C
L = 50pF 150 200 ns
Maximum Data Rate 250 kbps
Driver Enable to Output Low t DZL Figure 4, C L = 50pF 5200 ns
Driver Disable Time from Output
Low
t DLZ Figure 4, C L = 50pF 1000 ns
Driver Output Enable Time from
Shutdown
t DZL(SHDN) Figure 4, C L = 50pF 8000 ns
Driver Enable to Output High t DZH Figure 5, C L = 50pF 5200 ns
Driver Disable Time from Output
High
t DHZ Figure 5, C L = 50pF 1000 ns
Driver Output Enable Time from
Shutdown
t DZH(SHDN) Figure 5, C L = 50pF 8000 ns
Driver Time to Shutdown t SHDN 1000 ns
RECEIVER SWITCHING CHARACTERISTICS
(V CC = +3.3V ±10%, T
A = T MIN to T MAX , unless otherwise noted. Typical values are at V CC = +3.3V and T A = +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
t RPLH 120
Receiver Propagation Delay
t RPHL
Figure 6, C L = 20pF, V ID = 2V, V CM = 0
120
ns
Receiver Output Skew,
|t
RPLH - t RPHL |
t SKEW Figure 6, C L = 20pF 40 ns
Receiver Enable to Output Low t
RZL
Figure 7, R = 1k Ω, C
L = 20pF 80 ns
Receiver Enable to Output High t RZH Figure 7, R = 1k Ω, C
L = 20pF 80 ns
Receiver Disable Time from Low t RLZ Figure 7, R = 1k Ω, C
L = 20pF 80 ns
Receiver Disable Time form High t RHZ Figure 7, R = 1k Ω , C
L = 20pF 80 ns
Receiver Output Enable Time
from Shutdown t RZH(SHND) ,
t RZL(SHND)
Figure 7, R = 1k Ω, C
L = 20pF 5000 ns
Receiver Time to Shutdown t SHDN 1000 ns
Note 2: ∆V
OD and ∆V
OC are the changes in V OD and V OC , 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.