HWD490 データシートの表示（PDF） - Unspecified
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HWD490 Datasheet PDF : 20 Pages
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Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
SWITCHING CHARACTERISTICS—HWD481/HWD485, HWD490/HWD491, HWD1487 (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 (HWD481)
tZH(SHDN)
Figures 7 and 9, CL = 100pF, S2 closed
40
100
ns
Driver Enable from Shutdown to
Output Low (HWD481)
tZL(SHDN)
Figures 7 and 9, CL = 100pF, S1 closed
40
100
ns
Receiver Enable from Shutdown
to Output High (HWD481)
tZH(SHDN)
Figures 5 and 11, CL = 15pF, S2 closed,
A - B = 2V
300 1000
ns
Receiver Enable from Shutdown
to Output Low (HWD481)
tZL(SHDN)
Figures 5 and 11, CL = 15pF, S1 closed,
B - A = 2V
300 1000
ns
SWITCHING CHARACTERISTICS—HWD483, HWD487/HWD488/HWD489
(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
tZH Figures 7 and 9, CL = 100pF, S2 closed
Driver Enable to Output Low
tZL
Figures 7 and 9, CL = 100pF, S1 closed
Driver Disable Time from Low
tLZ
Figures 7 and 9, CL = 15pF, S1 closed
Driver Disable Time from High
tHZ Figures 7 and 9, CL = 15pF, S2 closed
Receiver Input to Output
tPLH
tPHL
Figures 6 and 10, RDIFF = 54Ω,
CL1 = CL2 = 100pF
I tPLH - tPHL I Differential
Receiver Skew
tSKD
Figures 6 and 10, RDIFF = 54Ω,
CL1 = CL2 = 100pF
Receiver Enable to Output Low
tZL
Figures 5 and 11, CRL = 15pF, S1 closed
Receiver Enable to Output High tZH Figures 5 and 11, CRL = 15pF, S2 closed
Receiver Disable Time from Low
Receiver Disable Time from High
Maximum Data Rate
tLZ
tHZ
fMAX
Figures 5 and 11, CRL = 15pF, S1 closed
Figures 5 and 11, CRL = 15pF, S2 closed
tPLH, tPHL < 50% of data period
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)
HWD483/HWD487 (Note 5)
HWD483/HWD487, Figures 7 and 9,
CL = 100pF, S2 closed
HWD483/HWD487, Figures 7 and 9,
CL = 100pF, S1 closed
HWD483/HWD487, Figures 5 and 11,
CL = 15pF, S2 closed
HWD483/HWD487, Figures 5 and 11,
CL = 15pF, S1 closed
250
250
300
300
250
250
100
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
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