MAX3140CEI データシートの表示（PDF） - Maxim Integrated
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MAX3140CEI
Maxim Integrated
MAX3140CEI Datasheet PDF : 36 Pages
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SPI/MICROWIRE-Compatible UART with Integrated
True Fail-Safe RS-485/RS-422 Transceivers
SWITCHING CHARACTERISTICS—SRL = GND
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP
Driver Input to Output
tDPLH
tDPHL
Figures 3 and 5, RDIFF = 54Ω,
CL1 = CL2 = 100pF
34
34
Driver Output Skew
| tDPLH - tDPHL |
tDSKEW
Figures 3 and 5, RDIFF = 54Ω,
CL1 = CL2 = 100pF
-2.5
Driver Rise or Fall Time
tDR, tDF
Figures 3 and 5, RDIFF = 54Ω,
CL1 = CL2 = 100pF
14
Maximum Data Rate
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
Receiver Input to Output
| tRPLH - tRPHL | Differential
Receiver Skew
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable Time from Low
fMAX
tDZH
tDZL
tDLZ
tDHZ
tRPLH,
tRPHL
tRSKD
tRZL
tRZH
tRLZ
Figures 4 and 6, CL = 100pF, S2 closed
Figures 4 and 6, CL = 100pF, S1 closed
Figures 4 and 6, CL = 15pF, S1 closed
Figures 4 and 6, CL = 15pF, S2 closed
Figures 7 and 9, |VID| ≥ 2.0V,
rise and fall time of VID ≤ 15ns
Figures 7 and 9, |VID| ≥ 2.0V,
rise and fall time of VID ≤ 15ns
Figures 2 and 8, CL = 100pF, S1 closed
Figures 2 and 8, CL = 100pF, S2 closed
Figures 2 and 8, CL = 100pF, S1 closed
10
106
0
20
20
20
Receiver Disable Time from
High
tRHZ
Figures 2 and 8, CL = 100pF, S2 closed
20
Time to Shutdown
Driver Enable from Shutdown to
Output High
tSHDN
tDZH(SHDN)
(Note 5)
Figures 4 and 6, CL = 15pF, S2 closed
50
200
Driver Enable from Shutdown to
Output Low
tDZL(SHDN)
Figures 4 and 6, CL = 15pF, S1 closed
Receiver Enable from Shutdown
to Output High
tRZH(SHDN)
Receiver Enable from Shutdown
to Output Low
tRZL(SHDN)
Figures 2 and 8, CL = 100pF, S2 closed
Figures 2 and 8, CL = 100pF, S1 closed
MAX
60
60
±10
25
150
150
100
100
150
±10
50
50
50
50
600
250
250
3500
3500
UNITS
ns
ns
ns
Mbps
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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: ∆VOD and ∆VOC are the changes in VOD and VOC, respectively, when the Dl input changes state.
Note 3: The SRL pin is internally biased to VCC/2 by a 100kΩ/100kΩ resistor-divider. It is guaranteed to be VCC/2 if left unconnected.
Note 4: Maximum current level applies to peak current just prior to foldback-current limiting; minimum current level applies during
current limiting.
Note 5: The device is put into shutdown 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 600ns, the device is guaranteed
to have entered shutdown.
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