DS485M National Semiconductor, DS485M Datasheet - Page 3

• Manufacturer Part Number: DS485M
• Description: IC, RS422/RS485 TRANSCEIVER 5.25V NSOIC8
• Manufacturer: National Semiconductor

Specifications of DS485M

• Device Type: Transceiver
• Ic Interface Type: RS422, RS485
• No. Of Drivers: 1
• Supply Voltage Range: 4.75V To 5.25V
• Driver Case Style: SOIC
• No. Of Pins: 8
• Operating Temperature Range: 0°C To +70°C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
f
Symbol
PLHD
PHLD
SKEW
r
f
ZH
ZL
LZ
HZ
PLHD
PHLD
SKEW
ZH
ZL
LZ
HZ
max
Switching Characteristics
Over Supply Voltage and Operating Temperature Ranges, unless otherwise specified (Notes 3, 7, 8)
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 V
V
Note 3: All typicals are given for: V
Note 4: ∆|V
Note 5: I
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, t
Note 8: C
Note 9: f
rate unit interval (1/f
ID
.
IN2
max
L
Driver Differential Propagation Delay — Low to High
Driver Differential Propagation Delay — High to Low
Differential Skew |t
Driver Rise Time
Driver Fall Time
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable from Output Low
Driver Disable from Output High
Receiver Differential Propagation Delay — Low to High
Receiver Differential Propagation Delay — High to Low
Differential Skew |t
Receiver Enable to Output High
Receiver Enable to Output Low
Receiver Disable from Output Low
Receiver Disable from Output High
Maximum Data Rate
includes jig and probe capacitance.
OD
includes the receiver input current and driver TRI-STATE leakage current.
is the guaranteed data rate for 50 ft of twisted pair cable. f
| and ∆|V
max
r
and t
). Using a 10% ratio yields f
OC
| are changes in magnitude of V
f
≤ 6 ns, Z
CC
PHLD
PHLD
O
= +5.0V, T
= 50Ω.
Parameter
− t
− t
PLHD
PLHD
A
= +25˚C.
max
|
|
= (0.1)/40 ns = 2.5 Mb/s. Higher data rates may be supported by allowing larger ratios.
OD
and V
OC
max
respectively, that occur when the input changes state.
may be conservatively determined from the ratio of driver transition time (t
3
R
C
C
C
C
C
C
(Note 9)
L
L
L
L
L
L
L
= 54Ω, C
= 100 pF
= 100 pF
= 15 pF
= 15 pF
= 15 pF (RO)
= 15 pF
Conditions
L
= 100 pF
Min
2.5
10
10
70
70
3
3
Typ
190
210
40
39
25
25
20
1
Max
170
170
170
170
320
320
110
110
110
110
65
65
10
40
40
50
www.national.com
r
) to the data
OD1/2/3
Units
Mbps
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
and