Datasheet

2 Maxim Integrated
+5.0V, ±30kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceiver
MAX14780E
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
(All voltages referenced to GND.)
Supply Voltage (V
CC
) ........................................................... +6V
Control Input Voltage (RE, DE) ...............................-0.3V to +6V
Driver Input Voltage (DI) .........................................-0.3V to +6V
Driver Output Voltage (A, B) ....................................-8V to +13V
Receiver Input Voltage (A, B) ..................................-8V to +13V
Receiver Output Voltage (RO) ................. -0.3V to (V
CC
+ 0.3V)
Driver Output Current .................................................... ±250mA
Continuous Power Dissipation (T
A
= +70°C)
SO (derate 5.9mW/°C above +70°C) ..........................471mW
PDIP (derate 9.1mW/°C above +70°C) .....................727.3mW
Operating Temperature Range .......................... -40°C to +85°C
Junction Temperature .....................................................+150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
Soldering Temperature (reflow) ......................................+260°C
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +5.0V ±10%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5.0V and T
A
= +25NC.) (Note 1)
ABSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DRIVER
V
CC
Supply-Voltage Range V
CC
4.5 5.5 V
Differential Driver Output V
OD
R
L
= 100I (RS-422), Figure 1
3 V
CC
V
R
L
= 54I (RS-485), Figure 1
2 V
CC
No load V
CC
Change in Magnitude of
Differential Output Voltage
DV
OD
R
L
= 100I or 54I, Figure 1 (Note 2)
0.2 V
Driver Common-Mode Output
Voltage
V
OC
R
L
= 100I or 54I, Figure 1
V
CC
/2 3 V
Change in Magnitude of
Common-Mode Voltage
DV
OC
R
L
= 100I or 54I, Figure 1 (Note 2)
0.2 V
Input-High Voltage V
IH
DE, DI, RE
3 V
Input-Low Voltage V
IL
DE, DI, RE
0.8 V
Input Hysteresis V
HYS
DE, DI, RE
100 mV
Input Current I
IN1
DE, DI, RE
Q1 FA
Input Impedance First Transition
at Power-Up
R
PWUP
DE, RE = RE = 2V
3.65 8.8
kI
Input Impedance on First
Transition after POR Delay
R
ft
DE = RE = 2V
7 60 kΩ
Driver Short-Circuit Output
Current
I
OSD
0 P V
OUT
P +12V (Note 3)
40 250
mA
-7V P V
OUT
P V
CC
(Note 3)
-250 -40
Driver Short-Circuit Foldback
Output Current
I
OSDF
(V
CC
- 1V) P V
OUT
P +12V (Note 3)
20
mA
-7V P V
OUT
P +1V (Note 3)
-20
Thermal-Shutdown Threshold T
TS
175
NC
Thermal-Shutdown Hysteresis T
TSH
15
NC
Input Current (A and B) I
A, B
V
DE
= 0V,
V
CC
= 0V or V
CC
V
IN
= +12V 125
FA
V
IN
= -7V -100
RECEIVER
Receiver Differential Threshold
Voltage
V
TH
-7V P V
CM
P +12V
-200 -125 -50 mV
Receiver Input Hysteresis
DV
TH
V
A
+ V
B
= 0V 15 mV