MAX1481 Datasheet, PDF (4/16 Pages) Maxim Integrated Products – Software-Selectable, Half-/Full-Duplex, Slew-Rate-Limited, 12Mbps, RS-485/RS-422 Transceivers in uMAX Package

Software-Selectable, Half-/Full-Duplex, Slew-Rate-Limited,
12Mbps, RS-485/RS-422 Transceivers in µMAX Package
SWITCHING CHARACTERISTICS (MAX1481/MAX1485) (continued)
(V_CC = 5V ±5%, T_A = T_MIN to T_MAX, unless otherwise noted. Typical values are at V_CC = +5V and T_A = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP
Driver Input to Output
t_DPLH
t_DPHL
R_DIFF = 54Ω, C_L1 = C_L2 = 100pF,
Figures 7 and 9
600
600
Driver Output Skew
| t_DPLH - t_DPHL |
t_DSKEW
R_DIFF = 54Ω, C_L1 = C_L2 = 100pF,
Figures 7 and 9
10
Driver Rise or Fall Time
t_DR, t_DF
R_DIFF = 54Ω, C_L1 = C_L2 = 100pF,
Figures 7 and 9
250
Maximum Data Rate
Driver Enable to Output Low
Driver Enable to Output High
Driver Disable Time from Low
Driver Disable Time from High
Receiver Input to Output
f_MAX
t_DZL
t_DZH
t_DLZ
t_DHZ
t_RPLH,
t_RPHL
C_L = 100pF, S1 closed, Figures 8 and 10
C_L = 100pF, S2 closed, Figures 8 and 10
C_L = 15pF, S1 closed, Figures 8 and 10
C_L = 15pF, S2 closed, Figures 8 and 10
Figures 11 and 13
250
90
| t_RPLH - t_RPHL | Differential
Receiver Skew
t_RSKD
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable Time from Low
Receiver Disable Time from High
Time to Shutdown
t_RZL
t_RZH
t_RLZ
t_RHZ
t_SHDN
Driver Enable from Shutdown to
Output High
t_DZH(SHDN)
Figures 11 and 13
C_L = 100pF, S1 closed, Figures 6 and 12
C_L = 100pF, S2 closed, Figures 6 and 12
C_L = 100pF, S1 closed, Figures 6 and 12
C_L = 100pF, S2 closed, Figures 6 and 12
MAX1481 only (Note 4)
MAX1481 only, C_L = 15pF, S2 closed,
Figures 8 and 10
15
20
20
20
20
50
200
Driver Enable from Shutdown to
Output Low
t_DZL(SHDN)
MAX1481 only, C_L = 15pF, S1 closed,
Figures 8 and 10
Receiver Enable from Shutdown
to Output High
t_RZH(SHDN)
MAX1481 only, C_L = 100pF, S2 closed,
Figures 6 and 12
Receiver Enable from Shutdown
to Output Low
t_RZL(SHDN)
MAX1481 only, C_L = 100pF, S1 closed,
Figures 6 and 12
MAX
1000
1000
UNITS
ns
200
ns
1000
3000
3000
200
200
150
ns
kbps
ns
ns
ns
ns
ns
ns
50
ns
50
ns
50
ns
50
ns
600
ns
3000
ns
3000
ns
500
ns
1000
ns
Note 1: All currents into the device are positive; all currents out of the device are negative. All voltages are referenced to device
ground unless otherwise noted.
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: Maximum current level applies to peak current just prior to foldback-current limiting; minimum current level applies during
current limiting.
Note 4: Shutdown is enabled by bringing RE high and DE low. If the enable inputs are in this state for less than 50ns, the MAX1481
is guaranteed not to enter shutdown. If the enable inputs are in this state for at least 600ns, the MAX1481 is guaranteed to
have entered shutdown.
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