Datasheet

ADM485E/ADM487E/ADM1487E
Rev. B | Page 3 of 16
SPECIFICATIONS
V
CC
= 5 V ± 10%, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Table 2. ADM485E/ADM487E/ADM1487E
Parameter Symbol Min Typ Max Unit Test Conditions/Comments
DRIVER
Differential Outputs
Differential Output Voltage (No Load) V
OD1
5 V
V
OD2
2 V R
L
= 50 Ω (RS-422) Differential Output Voltage (with Load)
1.5 5 V R
L
= 27 Ω (RS-485) (see Figure 18)
Δ |V
OD
| for Complementary Output States 0.2 V R
L
= 27 Ω or 50 Ω (see Figure 18)
Common-Mode Output Voltage V
OC
3 V R
L
= 27 Ω or 50 Ω (see Figure 18)
Δ |V
OC
| for Complementary Output States 0.2 V R
L
= 27 Ω or 50 Ω (see Figure 18)
Logic Inputs
Input High Voltage V
IH
2.0 V
DE, DI, RE
Input Low Voltage V
IL
0.8 V
DE, DI, RE
Logic Input Current
1
I
IN1
±2 μA
DE, DI, RE
RECEIVER
I
IN2
1.0 mA DE = 0 V, V
IN
= 12 V
−0.8 mA V
CC
= 0 V or 5.25 V, V
IN
= −7 V (ADM485E)
0.25 mA DE = 0 V, V
IN
= 12 V
Input Current (A, B)
−0.2 mA
V
CC
= 0 V or 5.25 V, V
IN
= −7 V
(ADM487E/ADM1487E)
Differential Inputs
Differential Input Threshold Voltage V
TH
−0.2 +0.2 V −7 V < V
CM
< +12 V
Input Hysteresis ΔV
TH
70 mV V
CM
= 0 V
Receiver Output Logic
Output Voltage High V
OH
3.5 V I
OUT
= −4 mA, V
ID
= +200 mV
Output Voltage Low V
OL
0.4 V I
OUT
= +4 mA, V
ID
= −200 mV
Three-State Output Leakage Current I
OZR
±1 μA 0.4 V < V
O
< 2.4 V
R
IN
12 kΩ −7 V < V
CM
< +12 V (ADM485E) Receiver Input Resistance
48 kΩ −7 V < V
CM
< +12 V (ADM487E/ADM1487E)
POWER SUPPLY
I
CC
500 900 μA
RE
= 0 V or V
CC
, DE = V
CC
(ADM485E)
300 500 μA
RE
= 0 V or V
CC
, DE = 0 V (ADM485E)
300 500 μA
RE
= 0 V or V
CC
, DE = V
CC
(ADM1487E)
230 400 μA
RE
= 0 V or V
CC
, DE = 0 V (ADM1487E)
250 400 μA
RE
= 0 V or V
CC
, DE = V
CC
(ADM487E)
No Load Supply Current
120 250 μA
RE
= 0 V, DE = 0 V (ADM487E)
Supply Current in Shutdown I
SHDN
0.5 10 μA
DE = 0 V, RE
= V
CC
(ADM487E)
Driver Short-Circuit Current, V
O
High I
OSD1
35 250 mA −7 V ≤ V
O
≤ +12 V, applies to peak current
Driver Short-Circuit Current, V
O
Low I
OSD2
35 250 mA −7 V ≤ V
O
≤ +12 V, applies to peak current
Receiver Short-Circuit Current I
OSR
7 95 mA 0 V ≤ V
O
≤ V
CC
ESD PROTECTION
A, B ±15 kV Human body model
1
Supply voltage is 5 V ± 5%.