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MAX3224EPP+ Datasheet(PDF) 7 Page - Maxim Integrated Products

Part # MAX3224EPP+
Description  1μA Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX3224EPP+ Datasheet(HTML) 7 Page - Maxim Integrated Products

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_______________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.
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
Pin Description
PIN
MAX3224
MAX3225
PDIP/
SSIP/
TSSOP
TQFN-
EP
MAX3226
MAX3227
MAX3244
MAX3245
NAME
FUNCTION
1
19
1
READY
Ready to Transmit Output, Active High. READY is enabled high when
V- goes below -4V and the device is ready to transmit.
2
1
2
28
C1+
Positive Terminal of Voltage-Doubler Charge-Pump Capacitor
3
20
3
27
V+
+5.5V Generated By the Charge Pump
4
2
4
24
C1-
Negative Terminal of Voltage-Doubler Charge-Pump Capacitor
5
3
5
1
C2+
Positive Terminal of Inverting Charge-Pump Capacitor
6
4
6
2
C2-
Negative Terminal of Inverting Charge-Pump Capacitor
7
5
7
3
V-
-5.5V Generated By the Charge Pump
8, 17
6, 15
13
9, 10, 11
T_OUT
RS-232 Transmitter Outputs
9, 16
7, 14
8
4–8
R_IN
RS-232 Receiver Inputs
10, 15
8, 13
9
15–19
R_OUT
TTL/CMOS Receiver Outputs
11
9
10
21
INVALID
Valid Signal Detector Output, Active Low. A logic-high indicates that
a valid RS-232 level is present on a receiver input.
12, 13
10, 11
11
12, 13, 14
T_IN
TTL/CMOS Transmitter Inputs
14
12
12
23
FORCEON
Force-On Input, Active High. Drive high to override AutoShutdown
Plus, keeping transmitters and receivers on (
FORCEOFF must be
high) (Table 1).
18
16
14
25
GND
Ground
19
17
15
26
VCC
+3.0V to +5.5V Single Supply Voltage
20
18
16
22
FORCEOFF
Force-Off Input, Active Low. Drive low to shut down transmitters,
receivers (except R2OUTB), and charge pump. This overrides
AutoShutdown Plus and FORCEON (Table 1).
20
R2OUTB
TTL/CMOS Noninverting Complementary Receiver Outputs. Always
active.
EP
Exposed Pad (TQFN only). Solder the exposed pad to the ground, or
leave unconnected.
Maxim Integrated
7
MAX3224–MAX3227/MAX3244/MAX3245


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