MAX3381EEUP Maxim Integrated, MAX3381EEUP Datasheet - Page 9

• Manufacturer Part Number: MAX3381EEUP
• Description: RS-232 Interface IC
• Manufacturer: Maxim Integrated
• Series: MAX3380E, MAX3381Er

Specifications of MAX3381EEUP

• Data Rate: 250 Kbps
• Operating Supply Voltage: 2.35 V to 5.5 V
• Supply Current: 1 mA
• Operating Temperature Range: 0 C to + 70 C
• Function: Transceiver
• Number Of Drivers: 2
• Number Of I/os: 8
• Number Of Receivers: 2
• Propagation Delay Time Ns: 0.15 us
• Shutdown: Yes

Figure 3. AutoShutdown Trip Levels
Figure 4. AutoShutdown Plus/ INVALID Timing Diagram
Figure 2c. AutoShutdown Plus Logic
+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers
T_IN
R_IN
+2.7V
+0.3V
-0.3V
-2.7V
OUTPUT
INVALID
0
TRANSMITTER
TRANSMITTER
DETECT
DETECT
EDGE
EDGE
RECEIVER
OUTPUTS
INPUTS
INPUTS
TRANSMITTERS ENABLED, INVALID HIGH
AutoShutdown, TRANSMITTERS DISABLED,
TRANSMITTERS ENABLED, INVALID HIGH
V
V+
V
CC
V-
0
0
L
1μA SUPPLY CURRENT INVALID LOW
with ±15kV ESD-Protected I/O and Logic Pins
FORCEON
_______________________________________________________________________________________
t
INVL
INDETERMINATE
INDETERMINATE
FORCEOFF
TIMER
t
INVH
30s
S
R
t
AUTOSHDN
AUTOSHDN
By connecting FORCEON and FORCEOFF to INVALID,
the MAX3380E/MAX3381E are shut down when no valid
receiver level is detected.
Unlike other RS-232 interface devices where the receiv-
er outputs swing between 0 and V
MAX3381E feature a separate logic supply input (V
that sets V
also sets the threshold for the transmitter inputs,
FORCEON and FORCEOFF. This feature allows a great
deal of flexibility in interfacing to many different types of
systems with different logic levels. Connect this input to
Figure 2d. Power-Down Logic
t
WU
* POWERDOWN IS ONLY AN INTERNAL SIGNAL.
THE TRANSMITTERS AND THE POWER SUPPLIES.
IT CONTROLS THE OPERATIONAL STATUS OF
AUTOSHDN
FORCEOFF
FORCEON
OH
t
AUTOSHDN
for the receiver and INVALID outputs. V
V
L
Logic Supply Input
t
WU
CC
, the MAX3380E/
POWERDOWN*
}
INVALID
REGION
L
9
L
)