Datasheet
MAX3140
SPI/MICROWIRE-Compatible UART with Integrated
True Fail-Safe RS-485/RS-422 Transceivers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +5V ±5%, DE = V
CC
, RE = GND, SHDN = V
CC
, f
XTL
= 1.8432MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values
are measured with V
CC
= +5V, UART configured for 9600 baud, T
A
= +25°C.) (Note 1)
R = 50Ω or R = 27Ω, Figure 1
R = 50Ω or R = 27Ω, Figure 1 (Note 2)
R = 27Ω (RS-422), Figure 1
R = 50Ω (RS-422), Figure 1
No load, Figure 1
V
IRQ
= V
CC
I
SINK
= 4mA
R = 50Ω or R = 27Ω, Figure 1 (Note 2)
CONDITIONS
V3V
OC
Common-Mode Output
Voltage
V0.2ΔV
OD
Change in Magnitude of
Differential Output Voltage
V
1.5
V
OD2
Differential Output Voltage
2.0
5V
OD1
pF5C
OUT2
Output Capacitance
µA±1I
LKG3
Output Leakage
V0.4V
OL2
Output Low Voltage
V0.2ΔV
OC
Change In Magnitude of
Common-Mode Voltage
UNITSMIN TYP MAXSYMBOLPARAMETER
(Note 3)
H/F, TXP, RXP, internal pull-down
DE, DI, RE
SRL = V
CC
or unconnected
DE, Dl, RE, H/F, TXP, RXP
DE, Dl, RE
SRL = GND (Note 3)
SRL = V
CC
V
0.4 · V
CC
0.6 · V
CC
V
IM2
SRL Input Middle Voltage
VV
CC
- 0.8V
IH2
SRL Input High Voltage
µA
10 40I
IN2
Input Current
±2I
IN1
mV100V
HYS
DI Input Hysteresis
V0.8V
IL1
Input Low Voltage
2.0
µA
-75
I
IN3
SRL Input Current
75
V0.8V
IL2
SRL Input Low Voltage
(Note 4)
DE = GND
V
CC
= GND or 5.25V
DE = GND
250
-250
µA
125
I
O
Full-Duplex Output Leakage
(Y and Z)
µA
-75
I
IN4
125
Full-Duplex Input Current
(A and B)
mA
±25
I
OSD
Short-Circuit Output Current
-7V ≤ V
CM
≤ +12V mV-200 -125 -50V
TH
mV25ΔV
TH
Input Hysteresis
Differential Threshold Voltage
I
SINK
= 4mA, V
ID
= -200mV
I
SOURCE
= 4mA, V
ID
= -50mV
0.4V ≤ V
O
≤ 2.4V
V0.4V
OL
VV
CC
- 1.5V
OH
µA±1I
OZR
Output High Voltage
Three-State Output Current
Output Low Voltage
-7V ≤ V
CM
≤ 12V
0 ≤ V
RO
≤ V
CC
kΩ96R
IN
mA±7 ±95I
OSR
Output Short-Circuit Current
Input Resistance
V
IN
= 12V
V
IN
= -7V
V
CC
= GND or 5.25V
V
IN
= 12V
V
IN
= -7V -100
-7V ≤ V
OUT
≤ V
CC
0 ≤ V
OUT
≤ 12V
0 ≤ V
OUT
≤ V
CC
H/F, TXP, RXP
V
2.4
V
IH1
Input High Voltage
UART IRQ OUTPUT (Open Drain)
RS-485 DRIVER
RS-485 RECEIVER