MAX3226 MAXIM [Maxim Integrated Products], MAX3226 Datasheet - Page 11

• Manufacturer Part Number: MAX3226
• Description: 1uA Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus
• Manufacturer: MAXIM [Maxim Integrated Products]

Figure 4b. AutoShutdown Plus, INVALID, and READY Timing Diagram
Figure 5. AutoShutdown Plus Initial Turn-On to Wake Up a
Mouse or Another System
OUTPUT
OUTPUT
INVALID
*MAX3224–MAX3227
MANAGEMENT
RS-232 Transceivers with AutoShutdown Plus
TRANSMITTER
TRANSMITTER
POWER-
UNIT
RECEIVER
OUTPUTS
INPUTS
INPUTS
*V
V
V
CC
CC
V+
CC
V-
0
0
0
t
INVL
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
MASTER SHDN LINE
______________________________________________________________________________________
FORCEOFF
MAX3224
MAX3225
MAX3226
MAX3227
MAX3244
MAX3245
t
0.1 F
INVH
FORCEON
t
AUTOSHDN
1M
t
WU
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.
If direct software control is desired, use INVALID to
indicate DTR or Ring Indicator signal. Tie FORCEOFF
and FORCEON together to bypass the AutoShutdown
Plus so the line acts like a SHDN input.
t
AUTOSHDN
Software-Controlled Shutdown
t
WU
}
INVALID
REGION
11