Datasheet

ADM2491E
Rev. B | Page 3 of 16
SPECIFICATIONS
All voltages are relative to their respective ground; 3.0 V ≤ V
DD1
≤ 5.5 V, 4.5 V ≤ V
DD2
≤ 5.5 V. All minimum/maximum specifications
apply over the entire recommended operation range, unless otherwise noted. All typical specifications are at T
A
= 25°C, V
DD1
= V
DD2
=
5.0 V, unless otherwise noted.
Table 1.
Parameter Symbol Min Typ Max Unit Test Conditions
SUPPLY CURRENT
Power Supply Current, Logic Side
TxD/RxD Data Rate = 2 Mbps I
DD1
3.0 mA Unloaded output
TxD/RxD Data Rate = 16 Mbps I
DD1
6 mA Half-duplex configuration,
R
TERMINATION
= 120 Ω, see Figure 5
Power Supply Current, Bus Side
TxD/RxD Data Rate = 2 Mbps I
DD2
4.0 mA Unloaded output
TxD/RxD Data Rate = 16 Mbps I
DD2
50 mA V
DD2
= 5.5 V, half-duplex
configuration,
R
TERMINATION
= 120 Ω, see Figure 5
DRIVER
Differential Outputs
Differential Output Voltage, Loaded |V
OD
| 2.0 5.0 V R
L
= 100 Ω (RS-422), see Figure 3
1.5 5.0 V R
L
= 54 Ω (RS-485), see Figure 3
1.5 5.0 V −7 V ≤ V
TEST1
≤ 12 V, see Figure 4
∆|V
OD
| for Complementary Output
States
∆|V
OD
| 0.2 V R
L
= 54 Ω or 100 Ω, see Figure 3
Common-Mode Output Voltage V
OC
3.0 V R
L
= 54 Ω or 100 Ω, see Figure 3
∆|V
OC
| for Complementary Output
States
∆|V
OC
| 0.2 V R
L
= 54 Ω or 100 Ω, see Figure 3
Output Leakage Current (Y, Z) I
O
100 µA DE = 0 V, V
DD2
= 0 V or 5 V, V
IN
= 12 V
−100 µA DE = 0 V, V
DD2
= 0 V or 5 V, V
IN
= −7 V
Short-Circuit Output Current I
OS
250 mA
Logic Inputs DE,
RE
, TxD
Input Threshold Low V
IL
0.25 × V
DD1
V
Input Threshold High V
IH
0.7 × V
DD1
V
Input Current I
TxD
−10 +0.01 +10 µA
RECEIVER
Differential Inputs
Differential Input Threshold Voltage V
TH
−0.2 +0.2 V
Input Voltage Hysteresis V
HYS
30 mV V
OC
= 0 V
Input Current (A, B) I
I
+1.0 mA V
OC
= 12 V
−0.8 mA V
OC
= −7 V
Line Input Resistance R
IN
12 kΩ
Logic Outputs
Output Voltage Low V
OLRxD
0.2 0.4 V I
ORxD
= 1.5 mA, V
A
− V
B
= −0.2 V
Output Voltage High V
OHRxD
V
DD1
− 0.3 V
DD1
− 0.2 V I
ORxD
= −1.5 mA, V
A
− V
B
= 0.2 V
Short-Circuit Current 100 mA
Three-State Output Leakage Current I
OZR
±1 µA V
DD1
= 5.5 V, 0 V < V
OUT
< V
DD1
COMMON-MODE TRANSIENT IMMUNITY
1
25 kV/µs V
CM
= 1 kV, transient magnitude =
800 V
1
CM is the maximum common-mode voltage slew rate that can be sustained while maintaining specification-compliant operation. V
CM
is the common-mode potential
difference between the logic and bus sides. The transient magnitude is the range over which the common mode is slewed. The common-mode voltage slew rates
apply to both rising and falling common-mode voltage edges.