MAX3225CAP 查看數據表（PDF） - Maxim Integrated
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MAX3225CAP
Maxim Integrated
MAX3225CAP Datasheet PDF : 20 Pages
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1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
Pin Description
MAX3224
MAX3225
DIP/
SSIP/ TQFN
TSSOP
PIN
MAX3226
MAX3227
1
19
1
2
1
2
3
20
3
4
2
4
5
3
5
6
4
6
7
5
7
8, 17 6, 15
13
9, 16 7, 14
8
10, 15 8, 13
9
11
9
10
12, 13 10, 11
11
14
12
12
MAX3244
MAX3245
—
28
27
24
1
2
3
9, 10, 11
4–8
15–19
21
12, 13, 14
23
NAME
FUNCTION
READY
Ready to Transmit Output, Active High. READY is enabled high when
V- goes below -4V and the device is ready to transmit.
C1+
V+
C1-
C2+
C2-
V-
T_OUT
R_IN
R_OUT
Positive Terminal of Voltage-Doubler Charge-Pump Capacitor
+5.5V Generated By the Charge Pump
Negative Terminal of Voltage-Doubler Charge-Pump Capacitor
Positive Terminal of Inverting Charge-Pump Capacitor
Negative Terminal of Inverting Charge-Pump Capacitor
-5.5V Generated By the Charge Pump
RS-232 Transmitter Outputs
RS-232 Receiver Inputs
TTL/CMOS Transmitter Outputs
INVALID Valid Signal Detector Output, Active Low. A logic-high indicates that a
valid RS-232 level is present on a receiver input.
T_IN TTL/CMOS Transmitter Inputs
Force-On Input, Active High. Drive high to override AutoShutdown
FORCEON Plus, keeping transmitters and receivers on (FORCEOFF must be high)
(Table 1).
18
16
14
19
17
15
20
18
16
25
GND Ground
26
VCC
+3.0V to +5.5V Single Supply Voltage
Force-Off Input, Active Low. Drive low to shut down transmitters,
22
FORCEOFF receivers (except R2OUTB), and charge pump. This overrides
AutoShutdown Plus and FORCEON (Table 1).
—
—
—
—
EP
—
20
R2OUTB TTL/CMOS Noninverting Complementary Receiver Outputs. Always
active.
—
EP
Exposed Paddle. Solder the exposed paddle to the ground, or leave
unconnected.
_______________Detailed Description
Dual Charge-Pump Voltage Converter
The MAX3224–MAX3227/MAX3244/MAX3245’s internal
power supply consists of a regulated dual charge
pump that provides output voltages of +5.5V (doubling
charge pump) and -5.5V (inverting charge pump), over
the +3.0V to +5.5V range. The charge pump operates
in discontinuous mode: if the output voltages are less
than 5.5V, the charge pump is enabled; if the output
voltages exceed 5.5V, the charge-pump is disabled.
Each charge pump requires a flying capacitor (C1, C2)
and a reservoir capacitor (C3, C4) to generate the V+
and V- supplies.
The READY output (MAX3224–MAX3227) is low when
the charge pumps are disabled in shutdown mode. The
READY signal asserts high when V- goes below -4V.
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