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DS485 数据表(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 DS485
功能描述  Low Power RS-485/RS-422 Multipoint Transceiver
PDF  10 Pages
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

DS485 数据表(HTML) 3 Page - National Semiconductor (TI)

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Switching Characteristics
Over Supply Voltage and Operating Temperature Ranges, unless otherwise specified (Notes 3, 7, 8)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
t
PLHD
Driver Differential Propagation Delay — Low to High
R
L = 54Ω,CL = 100 pF
10
40
65
ns
t
PHLD
Driver Differential Propagation Delay — High to Low
10
39
65
ns
t
SKEW
Differential Skew |t
PHLD −tPLHD|
1
10
ns
t
r
Driver Rise Time
325
40
ns
t
f
Driver Fall Time
325
40
ns
t
ZH
Driver Enable to Output High
C
L = 100 pF
170
ns
t
ZL
Driver Enable to Output Low
C
L = 100 pF
170
ns
t
LZ
Driver Disable from Output Low
C
L = 15 pF
170
ns
t
HZ
Driver Disable from Output High
C
L = 15 pF
170
ns
t
PLHD
Receiver Differential Propagation Delay — Low to High
C
L = 15 pF (RO)
70
190
320
ns
t
PHLD
Receiver Differential Propagation Delay — High to Low
70
210
320
ns
t
SKEW
Differential Skew |t
PHLD −tPLHD|20
50
ns
t
ZH
Receiver Enable to Output High
C
L = 15 pF
110
ns
t
ZL
Receiver Enable to Output Low
110
ns
t
LZ
Receiver Disable from Output Low
110
ns
t
HZ
Receiver Disable from Output High
110
ns
f
max
Maximum Data Rate
(Note 9)
2.5
Mbps
Note 1: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices
should be operated at these limits. The table of “Electrical Characteristics” specifies conditions of device operation.
Note 2: Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground except VOD1/2/3 and
VID.
Note 3: All typicals are given for: VCC = +5.0V, TA = +25˚C.
Note 4:
∆|VOD| and ∆|VOC| are changes in magnitude of V OD and VOCrespectively, that occur when the input changes state.
Note 5: IIN2 includes the receiver input current and driver TRI-STATE leakage current.
Note 6: Supply current specification is valid for loaded transmitters when DE = 0V or enabled (DE = H) with no load.
Note 7: f = 1 MHz, tr and tf ≤ 6 ns, ZO = 50Ω.
Note 8: CL includes jig and probe capacitance.
Note 9: fmax is the guaranteed data rate for 50 ft of twisted pair cable. f max may be conservatively determined from the ratio of driver transition time (tr) to the data
rate unit interval (1/fmax). Using a 10% ratio yields fmax = (0.1)/40 ns = 2.5 Mb/s. Higher data rates may be supported by allowing larger ratios.
www.national.com
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