MAX3224ECAP View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX3224ECAP
Maxim Integrated
MAX3224ECAP Datasheet PDF : 21 Pages
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E
±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
Pin Description (continued)
MAX3224E
MAX3225E
TQFN
DIP/
SSOP/
TSSOP
12
14
16
18
17
19
18
20
—
—
—
—
—
—
PIN
MAX3226E
MAX3227E
TQFN
SSOP/
TSSOP
9
12
11
14
12
15
13
16
—
—
—
—
—
—
MAX3244E
MAX3245E
SO/ SSOP/ TSSOP
MAX3245E
TQFN
NAME
FUNCTION
Force-On Input, Active High.
Drive high to override
23
25
FORCEON
AutoShutdown Plus, keeping
transmitters and receivers on
(FORCEOFF must be high)
(Table 1).
25
27
GND
Ground
+3.0V to +5.5V Single Supply
26
29
VCC
Voltage
Force-Off Input, Active Low.
Drive low to shut down
transmitters, receivers
22
24
FORCEOFF (except R2OUTB), and
charge pump. This overrides
AutoShutdown Plus and
FORCEON (Table 1).
TTL/CMOS Noninverting
20
21
R2OUTB Complementary Receiver
Outputs. Always active.
—
6, 10, 14,
18, 22, 28,
32, 36
N.C.
No Connection. Not internally
connected.
Exposed Pad. Solder the
—
—
EP
exposed pad to the ground
plane or leave unconnected.
_______________Detailed Description
Dual Charge-Pump Voltage Converter
The MAX3224E–MAX3227E/MAX3244E/MAX3245E’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 (MAX3224E–MAX3227E) is low
when the charge pumps are disabled in shutdown
mode. The READY signal asserts high when V- goes
below -4V.
8
Maxim Integrated
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