MAX1487 查看數據表（PDF） - Maxim Integrated
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MAX1487 Datasheet PDF : 17 Pages
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MAX481/MAX483/MAX485/
MAX487–MAX491/MAX1487
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
SWITCHING CHARACTERISTICS—MAX481/MAX485, MAX490/MAX491, MAX1487 (continued)
(VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Driver Enable from Shutdown to
Output High (MAX481)
tZH(SHDN)
Figures 7 and 9, CL = 100pF, S2 closed
40
100
ns
Driver Enable from Shutdown to
Output Low (MAX481)
tZL(SHDN)
Figures 7 and 9, CL = 100pF, S1 closed
40
100
ns
Receiver Enable from Shutdown
to Output High (MAX481)
tZH(SHDN)
Figures 5 and 11, CL = 15pF, S2 closed,
A - B = 2V
300 1000
ns
Receiver Enable from Shutdown
to Output Low (MAX481)
tZL(SHDN)
Figures 5 and 11, CL = 15pF, S1 closed,
B - A = 2V
300 1000
ns
SWITCHING CHARACTERISTICS—MAX483, MAX487/MAX488/MAX489
(VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2)
PARAMETER
Driver Input to Output
Driver Output Skew to Output
SYMBOL
tPLH
tPHL
tSKEW
CONDITIONS
Figures 6 and 8, RDIFF = 54Ω,
CL1 = CL2 = 100pF
Figures 6 and 8, RDIFF = 54Ω,
CL1 = CL2 = 100pF
MIN TYP
250 800
250 800
100
Driver Rise or Fall Time
tR, tF
Figures 6 and 8, RDIFF = 54Ω,
CL1 = CL2 = 100pF
250
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
Receiver Input to Output
I tPLH - tPHL I Differential
Receiver Skew
tZH
tZL
tLZ
tHZ
tPLH
tPHL
tSKD
Figures 7 and 9, CL = 100pF, S2 closed
Figures 7 and 9, CL = 100pF, S1 closed
Figures 7 and 9, CL = 15pF, S1 closed
Figures 7 and 9, CL = 15pF, S2 closed
Figures 6 and 10, RDIFF = 54Ω,
CL1 = CL2 = 100pF
Figures 6 and 10, RDIFF = 54Ω,
CL1 = CL2 = 100pF
250
250
300
300
250
250
100
Receiver Enable to Output Low
tZL
Receiver Enable to Output High tZH
Receiver Disable Time from Low tLZ
Receiver Disable Time from High
tHZ
Maximum Data Rate
fMAX
Time to Shutdown
tSHDN
Driver Enable from Shutdown to
Output High
tZH(SHDN)
Driver Enable from Shutdown to
Output Low
tZL(SHDN)
Receiver Enable from Shutdown
to Output High
tZH(SHDN)
Receiver Enable from Shutdown
to Output Low
tZL(SHDN)
Figures 5 and 11, CRL = 15pF, S1 closed
Figures 5 and 11, CRL = 15pF, S2 closed
Figures 5 and 11, CRL = 15pF, S1 closed
Figures 5 and 11, CRL = 15pF, S2 closed
tPLH, tPHL < 50% of data period
MAX483/MAX487 (Note 5)
MAX483/MAX487, Figures 7 and 9,
CL = 100pF, S2 closed
MAX483/MAX487, Figures 7 and 9,
CL = 100pF, S1 closed
MAX483/MAX487, Figures 5 and 11,
CL = 15pF, S2 closed
MAX483/MAX487, Figures 5 and 11,
CL = 15pF, S1 closed
20
20
20
20
250
50
200
MAX
2000
2000
UNITS
ns
800
ns
2000
2000
2000
3000
3000
2000
2000
50
50
50
50
600
2000
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
kbps
ns
ns
2000
ns
2500
ns
2500
ns
4
Maxim Integrated
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