ADM1485–SPECIFICATIONS
(V
Parameter
DRIVER
Differential Output Voltage, V
OD
V
OD3
∆|V
OD
| for Complementary Output States
Common-Mode Output Voltage V
OC
∆|V
OD
| for Complementary Output States
Output Short Circuit Current (V
OUT
= High)
Output Short Circuit Current (V
OUT
= Low)
CMOS Input Logic Threshold Low, V
INL
CMOS Input Logic Threshold High, V
INH
Logic Input Current (DE, DI)
RECEIVER
Differential Input Threshold Voltage, V
TH
Input Voltage Hysteresis,
∆V
TH
Input Resistance
Input Current (A, B)
Logic Enable Input Current (RE)
CMOS Output Voltage Low, V
OL
CMOS Output Voltage High, V
OH
Short Circuit Output Current
Tristate Output Leakage Current
POWER SUPPLY CURRENT
I
CC
(Outputs Enabled)
I
CC
(Outputs Disabled)
Specifications subject to change without notice.
CC
= +5 V
Max
5.0
5.0
5.0
5.0
0.2
3
0.2
250
250
0.8
±
1.0
5%. All specifications T
MIN
to T
MAX
unless otherwise noted.)
Unit
V
V
V
V
V
V
V
mA
mA
V
V
µA
V
mV
kΩ
mA
mA
µA
V
V
mA
µA
mA
mA
Test Conditions/Comments
R =
∞,
Figure 1
V
CC
= 5 V, R = 50
Ω
(RS-422), Figure 1
R = 27
Ω
(RS-485), Figure 1
V
TST
= –7 V to +12 V, Figure 2
R = 27
Ω
or 50
Ω,
Figure 1
R = 27
Ω
or 50
Ω,
Figure 1
R = 27
Ω
or 50
Ω
–7 V
≤
V
O
≤
+12 V
–7 V
≤
V
O
≤
+12 V
Min
Typ
2.0
1.5
1.5
35
35
2.0
–0.2
70
12
+0.2
+1
–0.8
±
1
0.4
4.0
7
85
±
1.0
1.35
0.7
2.2
1
–7 V
≤
V
CM
≤
+12 V
V
CM
= 0 V
–7 V
≤
V
CM
≤
+12 V
V
IN
= 12 V
V
IN
= –7 V
I
OUT
= +4.0 mA
I
OUT
= –4.0 mA
V
OUT
= GND or V
CC
0.4 V
≤
V
OUT
≤
+2.4 V
Outputs Unloaded, Digital Inputs = GND or V
CC
Outputs Unloaded, Digital Inputs = GND or V
CC
TIMING SPECIFICATIONS
(V
Parameter
CC
= +5 V
5%. All specifications T
MIN
to T
MAX
unless otherwise noted.)
Min
2
Typ
10
0
2
10
10
25
0
15
15
Max
15
5
10
25
25
40
5
25
25
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
Test Conditions/Comments
R
L
Diff = 54
Ω
C
L1
= C
L2
= 100 pF, Figure 3
R
L
Diff = 54
Ω
C
L1
= C
L2
= 100 pF, Figure 3
R
L
Diff = 54
Ω
C
L1
= C
L2
= 100 pF, Figure 3
DRIVER
Propagation Delay Input to Output T
PLH
, T
PHL
Driver O/P to
O/P
T
SKEW
Driver Rise/Fall Time T
R
, T
F
Driver Enable to Output Valid
Driver Disable Timing
RECEIVER
Propagation Delay Input to Output T
PLH
, T
PHL
Skew |T
PLH
–T
PHL
|
Receiver Enable T
EN1
Receiver Disable T
EN2
Specifications subject to change without notice.
18
C
L
= 15 pF, Figure 5
Figure 6
Figure 6
–2–
REV. A
AD [ ANALOG DEVICES ]
