Datasheet

3Maxim Integrated
40Mbps, +3.3V, RS-485 Half-Duplex
Transceivers
MAX14840E/MAX14841E
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +3.6V, T
A
= -40NC to +125NC, unless otherwise noted. Typical values are at V
CC
= +3.3V and T
A
= +25NC.) (Notes 2, 3)
SWITCHING CHARACTERISTICS
(V
CC
= +3.0V to +3.6V, T
A
= -40NC to +125NC, unless otherwise noted. Typical values are at V
CC
= +3.3V and T
A
= +25NC.) (Notes 2, 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Receiver Differential Threshold
Voltage (MAX14840E Only)
V
THF
-7V P V
CM
P 12V, V
OD
falling
-200 -10 mV
V
THR
-7V P V
CM
P 12V, V
OD
rising
10 200 mV
Receiver Input Hysteresis
(MAX14840E Only)
V
CM
= 0V 20 170 mV
Receiver Differential Threshold
Voltage (MAX14841E Only)
V
TH
-7V P V
CM
P 12V
-200 -105 -10 mV
Receiver Input Hysteresis
(MAX14841E Only)
DV
TH
V
CM
= 0V 10 mV
LOGIC INTERFACE
Input High Voltage V
IH
DE, DI 2.0 5.5
V
RE
2.0
Input Low Voltage V
IL
DE, DI, RE
0.8 V
Input Hysteresis V
HYS
DE, DI, RE
50 mV
Input Current I
IN
DE, DI, RE
-1 +1
FA
Input Impedance on First
Transition
DE, RE
1 10
kI
Output High Voltage V
OH
RE = GND, I
O
= -1mA, V
A
- V
B
> 200mV
V
CC
-
1.5
V
Output Low Voltage V
OL
RE = GND, I
O
= 1mA, V
A
- V
B
< -200mV
0.4 V
Three-State Output Current at
Receiver
I
OZR
RE = V
CC
, 0V P V
O
P V
CC
-1 +1
FA
Receiver Output Short-Circuit
Current
I
OSR
0V P V
RO
P V
CC
-95 +95 mA
PROTECTION
Thermal Shutdown Threshold T
TS
160
NC
Thermal Shutdown Hysteresis T
TSH
15
NC
ESD Protection: A, B to GND
IEC 61000-4-2 Air Gap Discharge
Q20
kVIEC 61000-4-2 Contact Discharge
Q12
HBM
Q35
ESD Protection: All Other Pins HBM
Q2
kV
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DRIVER
Propagation Delay
t
DPLH
R
L
= 54I, C
L
= 50pF, Figures 2 and 3
(Note 5)
5 12 20
ns
t
DPHL
5 12 20
Differential Driver Output Skew
|t
DPLH
- t
DPHL
|
t
DSKEW
R
L
= 54I, C
L
= 50pF, Figures 2 and 3
(Notes 5, 8)
2 ns
Driver Differential Output Rise or
Fall Time
t
HL
, t
LH
R
L
= 54I, C
L
= 50pF, Figures 2 and 3
(Notes 5, 8)
7.5 ns