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MAX3225E Datasheet

  • MAX3225E

  • " ?à15kV ESD-Protected, 1?A, 1Mbps, 3.0V to 5.5V, RS-232 Tr...

  • 416.40KB

  • Maxim   Maxim

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鹵15kV ESD-Protected, 1碌A(chǔ), 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
MAX3224E鈥揗AX3227E/MAX3244E/MAX3245E
鈥?/div>
+0.3V
T_IN
EDGE
DETECT
FORCEOFF
S
30sec
TIMER
R
R_IN
-0.3V
30碌s
TIMER
R
AUTOSHDN
INVALID
R_IN
EDGE
DETECT
INVALID ASSERTED IF ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR
AT LEAST
30碌s.
FORCEON
Figure 3a.
INVALID
Functional Diagram,
INVALID
Low
Figure 3c. AutoShutdown Plus Logic
+2.7V
FORCEOFF
POWERDOWN*
R_IN
FORCEON
30碌s
TIMER
R
INVALID
AUTOSHDN
-2.7V
INVALID DEASSERTED IF ANY RECEIVER INPUT HAS BEEN BETWEEN +2.7V AND -2.7V
FOR
LESS THAN
30碌s.
* POWERDOWN IS ONLY AN INTERNAL SIGNAL.
IT CONTROLS THE OPERATIONAL STATUS OF
THE TRANSMITTERS AND THE POWER SUPPLIES.
Figure 3b.
INVALID
Functional Diagram,
INVALID
High
Figure 3d. Power-Down Logic
Table 2.
INVALID
Truth Table
RS-232 SIGNAL
PRESENT AT ANY
RECEIVER INPUT
Yes
No
INVALID
OUTPUT
High
Low
tem saves power without changes to the existing BIOS
or operating system.
Figures 3a and 3b depict valid and invalid RS-232
receiver voltage levels.
INVALID
indicates the receiver
input鈥檚 condition, and is independent of FORCEON and
FORCEOFF
states. Figure 3 and Tables 1 and 2 sum-
marize the operating modes of the MAX3224E鈥?/div>
MAX3227E/MAX3244E/MAX3245E. FORCEON and
FORCEOFF
override AutoShutdown Plus circuitry.
When neither control is asserted, the IC selects
between these states automatically based on the last
receiver or transmitter input edge received.
When shut down, the device鈥檚 charge pumps turn off,
V+ is pulled to V
CC
, V- is pulled to ground, the transmit-
ter outputs are high impedance, and READY
(MAX3224E鈥?MAX3227E) is driven low. The time
required to exit shutdown is typically 100碌s (Figure 8).
By connecting FORCEON to
INVALID,
the MAX3224E鈥?/div>
MAX3227E/MAX3244E/MAX3245E 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 MAX3224E鈥揗AX3227E/MAX3244E/MAX3245E shut
down when no valid receiver level is detected and
INVALID HIGH
+2.7V
RECEIVER INPUT LEVELS
INDETERMINATE
+0.3V
0
-0.3V
INDETERMINATE
-2.7V
INVALID HIGH
INVALID LOW
Figure 4a. Receiver Positive/Negative Thresholds for
INVALID
10
______________________________________________________________________________________

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