MAX14770E_11 Datasheet, PDF (5/16 Pages) Maxim Integrated Products – High-ESD Profibus RS-485 Transceiver

High-ESD Profibus RS-485 Transceiver
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V Q10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, TA = +25NC.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
RECEIVER SWITCHING CHARACTERISTICS
Receiver Propagation
Delay
t_RPLH
tRPHL
CL = 15pF; Figures 8 and 9 (Note 7)
Receiver Output
Skew
t_RSKEW C_L = 15pF; Figures 8 and 9 (Notes 7, 8)
Maximum Data Rate
Receiver Enable to
Output High
t_RZH
S2 closed; RL = 1kI, CL = 15pF; Figure 10
Receiver Enable to
Output Low
t_RZL
S1 closed; RL = 1kI, CL = 15pF; Figure 10
Receiver Disable
Time from Low
t_RLZ
S1 closed; RL = 1kI, CL = 15pF; Figure 10
Receiver Disable
Time from High
t_RHZ
S2 closed; RL = 1kI, CL = 15pF; Figure 10
MIN TYP MAX UNITS
28
ns
2
ns
20
Mbps
30
ns
30
ns
30
ns
30
ns
Receiver Enable from
Shutdown to Output
High
t_RZL(SHDN)
S1 closed; RL = 1kI, CL = 15pF; Figure 10
(Notes 6, 7)
100
Fs
Receiver Enable from
Shutdown to Output
Low
t_RZH(SHDN)
S2 closed; RL = 1kI, CL = 15pF; Figure 10
(Notes 6, 7)
100
Fs
Time to Shutdown
t_SHDN
(Note 6)
50
800
ns
Note 2: Devices are production tested at TA = +25NC. Specifications over temperature limits are guaranteed by design.
Note 3: V_ODPP is the difference in VOD, with the DI at high and DI at low.
Note 4: DV_OD and DV_OC are the changes in |V_OD| and |V_OC|, respectively, with the DI at high and DI at low.
Note 5: The short-circuit output current applies to peak current just prior to foldback current limiting; the short-circuit foldback out-
put current applies during current limiting to allow a recovery from bus contention.
Note 6: Shutdown is enabled by bringing RE high and DE low. If the enable inputs are in this state for less than 50ns, the device
is guaranteed not to enter shutdown. If the enable inputs are in this state for at least 800ns, the device is guaranteed to
have entered shutdown.
Note 7: Capacitive load includes test probe and fixture capacitance.
Note 8: Guaranteed by characterization; not production tested.
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