MAX3224EEUP+ Maxim Integrated Products, MAX3224EEUP+ Datasheet - Page 11

• Manufacturer Part Number: MAX3224EEUP+
• Description: IC TXRX RS-232 W/SHTDWN 20-TSSOP
• Manufacturer: Maxim Integrated Products
• Type: Transceiverr

Specifications of MAX3224EEUP+

• Number Of Drivers/receivers: 2/2
• Protocol: RS232
• Voltage - Supply: 3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

By connecting FORCEON to INVALID, the MAX3224–
MAX3227/MAX3244/MAX3245 shut down when no valid
receiver level and no receiver or transmitter edge is
detected for 30sec, and wake up when a valid receiver
level or receiver or transmitter edge is detected.
By connecting FORCEON and FORCEOFF to INVALID,
the MAX3224–MAX3227/MAX3244/MAX3245 shutdown
when no valid receiver level is detected and wake up
when a valid receiver level is detected (same function-
ality as AutoShutdown feature on MAX3221/MAX3223/
MAX3243).
A mouse or other system with AutoShutdown Plus may
need time to wake up. Figure 5 shows a circuit that
forces the transmitters on for 100ms, allowing enough
time for the other system to realize that the MAX3244/
MAX3245 is awake. If the other system outputs valid
RS-232 signal transitions within that time, the RS-232
ports on both systems remain enabled.
Figure 4b. AutoShutdown Plus, INVALID, and READY Timing Diagram
OUTPUT
OUTPUT
INVALID
*MAX3224–MAX3227
RS-232 Transceivers with AutoShutdown Plus
TRANSMITTER
TRANSMITTER
RECEIVER
OUTPUTS
INPUTS
INPUTS
*V
V
V
CC
V+
CC
CC
V-
0
0
0
t
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
INVL
______________________________________________________________________________________
t
INVH
t
AUTOSHDN
t
WU
Figure 5. AutoShutdown Plus Initial Turn-On to Wake Up a
Mouse or Another System
MANAGEMENT
POWER-
UNIT
t
AUTOSHDN
MASTER SHDN LINE
FORCEOFF
MAX3224
MAX3225
MAX3226
MAX3227
MAX3244
MAX3245
0.1μF
t
WU
FORCEON
1MΩ
}
INVALID
REGION
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