MAX3248EEAI-T Maxim Integrated, MAX3248EEAI-T Datasheet - Page 5

• Manufacturer Part Number: MAX3248EEAI-T
• Description: RS-232 Interface IC
• Manufacturer: Maxim Integrated
• Series: MAX3238E, MAX3248Er

(V
______________________________________________________________Pin Description
+3.0V to +5.5V, 10nA, 250kbps RS-232 Transceivers
17, 19, 22, 23, 24
CC
5, 6, 7, 10, 12
18, 20, 21
= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ, T
8, 9, 11
PIN
13
14
15
16
25
26
27
28
1
2
3
4
-1
-2
-3
-4
-5
-6
6
5
4
3
2
1
0
2.0
with ±15kV ESD-Protected I/O and Logic Pins
TRANSMITTER OUTPUT VOLTAGE
1 TRANSMITTER 250kbps
4 TRANSMITTERS 15.6kbps
ALL TRANSMITTERS LOADED
WITH 3kΩ +1000pF
2.5
_______________________________________________________________________________________
vs. SUPPLY VOLTAGE
FORCEOFF
FORCEON
SUPPLY VOLTAGE (V)
R1OUTB
3.0
INVALID
R_OUT
T_OUT
NAME
GND
R_IN
T_IN
C2+
V
C1+
C2-
C1-
V+
V-
CC
3.5
4.0
V
V
Positive Terminal of Inverting Charge-Pump Capacitor
Ground
Negative Terminal of Inverting Charge-Pump Capacitor
-5.5V Generated by the Charge Pump
RS-232 Transmitter Outputs (T1OUT–T5OUT)
RS-232 Receiver Inputs (R1IN–R3IN)
Force-On Input. Drive high to override AutoShutdown Plus, keeping transmitters and
receivers on (FORCEOFF must be high) (Table 1). This pin has an active positive feedback
resistor. Once driven to a valid logic level, the pin retains that level if left unconnected until
power is cycled.
Force-Off Input. Drive low to shut down transmitters, receivers (except R1OUTB), and on-
board supply. This overrides AutoShutdown Plus and FORCEON (Table 1). This pin has an
active positive feedback resistor. Once driven to a valid logic level, the pin retains that
level if left unconnected until power is cycled.
Output of the Valid Signal Detector. A logic 1 indicates if a valid RS-232 level is present on
receiver inputs.
Noninverting Complementary Receiver Output. Always active.
TTL/CMOS Transmitter Inputs (T5IN–T1IN). This pin has an active positive feedback resis-
tor. Once driven to a valid logic level, the pin retains that level if left unconnected until
power is cycled.
TTL/CMOS Receiver Outputs (R3OUT–R1OUT)
Negative Terminal of Voltage-Doubler Charge-Pump Capacitor
+3.0V to +5.5V Supply Voltage
+5.5V Generated by the Charge Pump
Positive Terminal of Voltage-Doubler Charge-Pump Capacitor
OUT
OUT-
4.5
+
5.0
Typical Operating Characteristics (continued)
FUNCTION
50
40
30
20
10
0
2.0
A
= +25°C, unless otherwise noted.)
1 TRANSMITTER 250kbps
4 TRANSMITTERS 15.6kbps
ALL TRANSMITTERS LOADED
WITH 3kΩ +1000pF
2.5
vs. SUPPLY VOLTAGE
SUPPLY CURRENT
SUPPLY VOLTAGE (V)
3.0
3.5
4.0
4.5
5.0
5