MAX3224EPP Maxim Integrated, MAX3224EPP Datasheet - Page 7

• Manufacturer Part Number: MAX3224EPP
• Description: RS-232 Interface IC
• Manufacturer: Maxim Integrated
• Series: MAX3224, MAX3225, MAX3226, MAX3227, MAX3244, MAX3245r

Specifications of MAX3224EPP

• Data Rate: 250 Kbps
• Operating Supply Voltage: 3 V to 5.5 V
• Supply Current: 1 mA
• Operating Temperature Range: 0 C to + 70 C
• Function: Transceiver
• Number Of Drivers: 2
• Number Of I/os: 8
• Number Of Receivers: 2
• Propagation Delay Time Ns: 0.15 us
• Shutdown: Yes

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