Datasheet

MAX3157
High CMRR RS-485 Transceiver
with ±50V Isolation
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +5V ±5%, YR = ZR = AR = BR = ISOCOM, C1 = C2 = 0.047µF, C3 = C4 = 1µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DE = GND, V
CC
= GND or 5.25V, -7V ≤ (V
IN
-
V
ISOCOM
) ≤ 12V, YR = ZR = ISOCOM
-5.0 8.0
Output Leakage (Y and Z)
Full Duplex
I
O
DE = GND, V
CC
= GND or 5.25V, -7V ≤ (V
IN
-
V
ISOCOM
) ≤ 12V, YR open, ZR open
-0.58 1.0
mA
I
OSD1
V
ISOCOM
- 7V ≤ V
OUT
≤ V
ISOVCC
-250
Driver Short-Circuit Output
Current (Note 3)
I
OSD2
V
ISOCOM
- 7V ≤ V
OUT
≤ V
ISOCOM
+12V 250
mA
RECEIVER
Receiver Differential Threshold
Voltage
V
TH
-7V ≤ V
CM
- V
ISOCOM
≤ 12V -200 -125 -50 m V
Receiver Input Hysteresis ∆V
TH
25 mV
Receiver Output High Voltage V
OH
I
O
= -4mA, V
ID
= -50mV V
CC
- 1.5 V
Receiver Output Low Voltage V
OL
I
O
= 4mA, V
ID
= -200mV 0.4
V
Three-State Output Current at
Receiver
I
OZR
0.4V ≤ V
O
≤ 2.4V ±1µA
-7V ≤ V
CM
- V
ISOCOM
≤ 12V, AR = BR =
ISOCOM
1.5
Receiver Input Resistance R
IN
-7V ≤ V
CM
- V
ISOCOM
≤ 12V, AR open,
BR open
12
kΩ
Receiver Output Short-Circuit
Current
I
OSR
0V ≤ V
RO
≤ V
CC
±7 ±100 mA
SUPPLY CURRENT
Supply Current I
CC
No load, RE = DE = DI = GND or V
CC
25 85 mA
DE = GND, RE = V
CC
, V
ISOCOM
= GND 25 60
Supply Current in Shutdown
Mode
I
SHDN
DE = GND, RE = V
CC
, V
ISOCOM
= ±50V ±600
µA
Maximum Ground Differential ∆V
GND
DE = GND, RE = V
CC
,
| ISOCOM leakage | ≤ 600µA
±50 V
SWITCHING CHARACTERISTICS
(V
CC
= +5V ±5%, YR = ZR = AR = BR = ISOCOM, C1 = C2 = 0.047µF, C3 = C4 = 1µF. Typical values are at V
CC
= +5V and T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
t
DPLH
Figures 3 and 5, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
400 1400 2000
Driver Input to Output
t
DPHL
Figures 3 and 5, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
400 1400 2000
ns
Driver Output Skew
| t
DPLH
- t
DPHL
|
t
DSKEW
Figures 3 and 5, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
250 ns
Driver Rise or Fall Time t
DR
, t
DF
Figures 3 and 5, R
DIFF
= 54Ω,
C
L1
= C
L2
=100pF
200 1200 2200 ns
Maximum Data Rate f
MAX
250 kbps