MAX14781E_14 Datasheet, PDF (5/19 Pages) Maxim Integrated Products – Half-Duplex RS-485 Transceiver with Polarity Correction

MAX14781E
Half-Duplex RS-485 Transceiver
with Polarity Correction
Switching Characteristics (continued)
(V_CC = 5V ± 10%, T_A = -40°C to +85°C, unless otherwise noted. Typical values are at V_CC = 5V and T_A = +25°C.)(Notes 2, 3)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Receiver Enable to Output Low
t_RZL
R_L = 1kΩ, C_L = 15pF, Figure 8
(Note 9)
50
ns
Receiver Disable Time from Low
t_RLZ
R_L = 1kΩ, C_L = 15pF, Figure 8
(Note 9)
50
ns
Receiver Disable Time from High
t_RHZ
R_L = 1kΩ, C_L = 15pF, Figure 8
(Note 9)
50
ns
Receiver Enable from Shutdown
to Output High
t_RZH(SHDN)
R_L = 1kΩ, C_L = 15pF, Figure 8
(Note 9)
5.5
μs
Receiver Enable from Shutdown
to Output Low
t_RZL(SHDN)
R_L = 1kΩ, C_L = 15pF, Figure 8
(Note 9)
5.5
μs
Time to Shutdown
t_SHDN
(Note 10)
50
340
700
ns
Note 2: All devices are 100% production tested at T_A = +25°C. Spefications over temperature are guaranteed by design.
Note 3: All currents into the device are positive. All currents out of the device are negative. All voltages are referenced to ground,
unless otherwise noted.
Note 4: ΔV_OD and ΔV_OC are the changes in V_OD and V_OC, respectively, when the DI input changes state.
Note 5: The short-circuit output current applies to the peak current just prior to foldback current limiting. The short-circuit foldback
output current applies during current limiting to allow recovery from a bus contention.
Note 6: t_PM is the interval, with no A/B switching activity, after which the internal logic circuitry records the polarity. t_PM includes the
correction delay, after which the polarity is changed.
Note 7: Not production tested. Guaranteed by design.
Note 8: Capacitive loads include test probe and fixture capacitance.
Note 9: This parameter refers to the driver/receiver enable delay when the device has exited the initial hot-swap state and is in nor-
mal operating mode.
Note 10: Shutdown is enabled by driving RE high and DE low. The device is guaranteed to have entered shutdown after t_SHDN has
elapsed.
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