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DS481TM Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DS481TM
Description  Low Power RS-485/RS-422 Multipoint Transceiver with Sleep Mode
PDF  8 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DS481TM Datasheet(HTML) 3 Page - National Semiconductor (TI)

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Switching Characteristics
Over Supply Voltage and Operating Temperature Ranges, unless otherwise specified (Notes 5, 9, 10)
Symbol
Parameter
Conditions
Min
Typ Max
Units
t
PLHD
Driver Differential Propagation Delay — Low to High
R
L =54
Ω,C
L = 100 pF
10
40
80
ns
t
PHLD
Driver Differential Propagation Delay — High to Low
10
39
80
ns
t
SKEW
Differential Skew |t
PHLD −tPLHD|0
1
10
ns
t
r
Driver Rise Time
325
50
ns
t
f
Driver Fall Time
325
50
ns
t
ZH
Driver Enable to Output High
C
L = 100 pF
50
200
ns
t
ZL
Driver Enable to Output Low
C
L = 100 pF
65
200
ns
t
LZ
Driver Disable from Output Low
C
L = 15 pF
80
200
ns
t
HZ
Driver Disable from Output High
C
L = 15 pF
80
200
ns
t
PSH
Driver Enable from Sleep
C
L = 100 pF
70
98
250
ns
Mode to Output High
(Note 12) (Figures 5, 6)
t
PSL
Driver Enable from Sleep
C
L = 100 pF
70
98
250
ns
Mode to Output Low
(Note 12) (Figures 7, 8)
t
PLHD
Receiver Differential Propagation Delay — Low to High
C
L = 15 pF (RO)
30
190
400
ns
t
PHLD
Receiver Differential Propagation Delay — High to Low
30
210
400
ns
t
SKEW
Differential Skew |t
PHLD −tPLHD|
0
20
50
ns
t
ZH
Receiver Enable to Output High
C
L = 15 pF
45
150
ns
t
ZL
Receiver Enable to Output Low
40
150
ns
t
LZ
Receiver Disable from Output Low
50
150
ns
t
HZ
Receiver Disable from Output High
55
150
ns
t
PSH
Receiver Enable from Sleep
C
L = 15 pF
70
97
250
ns
Mode to Output High
(Note 12) (Figures 11, 13)
t
PSL
Receiver Enable from Sleep
C
L = 15 pF
70
95
250
ns
Mode to Output Low
(Note 12) (Figures 11, 12)
t
SLEEP
Time to Sleep (Device)
DE = L and RE (Note 1) = H
50
600
ns
(Figure 14)
f
max
Maximum Data Rate
(Note 11)
2.0
Mbps
Note 3: “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 4: Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground except VOD1/2/3and
VID.
Note 5: All typicals are given for: VCC = +5.0V, TA = +25˚C.
Note 6:
∆|VOD| and ∆|VOC| are changes in magnitude of V OD and VOC respectively, that occur when the input changes state.
Note 7: IIN2 includes the receiver input current and driver TRI-STATE leakage current.
Note 8: Supply current specification is valid for loaded transmitters when DE = 0V or enabled (DE = H) with no load.
Note 9: f = 1 MHz, tr and tf ≤ 6 ns, ZO =50Ω.
Note 10: CL includes jig and probe capacitance.
Note 11: 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)/50 ns = 2.0 Mb/s. Higher data rates may be supported by allowing larger ratios.
Note 12: For enable from sleep mode delays DE = L and RE (Note 1) = H for greater than 600 ns prior to test (device is in sleep mode).
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