Datasheet

3Maxim Integrated
High-ESD Profibus RS-485 Transceiver
MAX14770E
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +5V Q10%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V, T
A
= +25NC.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Driver Short-Circuit
Foldback Output
Current (Note 5)
I
OSDF
(V
CC
- 1V) P V
OUT
P +12V; output low
-15
mA
-7V P V
OUT
P +1V; output high
+15
LOGIC INPUTS
Driver Input High
Voltage
V
IH
DE, DI, RE
2.0 V
Driver Input Low
Voltage
V
IL
DE, DI, RE
0.8 V
Driver Input
Hysteresis
V
HYS
DE, DI, RE
50 mV
Driver Input Current I
IN
DE, DI, RE
-1 +1
FA
Input Impedance in
Hot Swap
R
DE
Figure 11 until the first low-to-high transition of DE
occurs
1 5.6 10
kW
R
RE
Figure 11 until the first high-to-low transition of RE
occurs
RECEIVER
Input Current (A, B) I
A,
I
B
DE = GND, V
CC
= V
GND
or
+5.5V
V
IN
= 12V +250
FA
V
IN
= -7V -200
Differential Input
Capacitance
C
AB
Between A and B, DE = RE = GND at 6MHz
8 pF
Receiver Differential
Threshold Voltage
V
TH
-7V P V
CM
P 12V
-200 -125 -50 mV
Receiver Input
Hysteresis
DV
TH
V
CM
= 0V 15 mV
LOGIC OUTPUT
Output High Voltage V
OH
I
OUT
= -6mA, V
A
- V
B
= V
TH
4 V
Output Low Voltage V
OL
I
OUT
= 6mA, V
A
- V
B
= -V
TH
0.4 V
Three-State Receiver
Output Current
I
OZR
0V P V
OUT
P V
CC
-1 +1
FA
Receiver Input
Resistance
R
IN
-7V P V
CM
P 12V
48
kI
Receiver Output
Short-Circuit Current
I
OSR
0V P V
RO
P V
CC
-110 +110 mA
PROTECTION SPECIFICATIONS
Thermal-Shutdown
Threshold
V
TS
+160
NC
Thermal-Shutdown
Hysteresis
V
TSH
15
NC
ESD Protection, A
and B Pins
HBM
±35
kVIEC 61000-4-2 Air-Gap Discharge to GND
±20
IEC 61000-4-2 Contact Discharge to GND
±10