max221e Maxim Integrated Products, Inc., max221e Datasheet - Page 4

• Manufacturer Part Number: max221e
• Description: Max221e ?15kv Esd-protected, +5v, 1?a, Single Rs-232 Transceiver With Autoshutdown
• Manufacturer: Maxim Integrated Products, Inc.

±15kV ESD-Protected, +5V, 1µA, Single RS-232
Transceiver with AutoShutdown
(V
4
CC
PIN
10
11
12
13
14
15
16
_______________________________________________________________________________________
-10
1
2
3
4
5
6
7
8
9
10
-2
-4
-6
-8
= +5V, 250kbps data rate, 0.1µF capacitors, transmitter loaded with 3k and C
8
6
4
2
0
0
VOLTAGE vs. LOAD CAPACITANCE
1000
TRANSMITTER OUTPUT
FORCEOFF
FORCEON
LOAD CAPACITANCE (pF)
INVALID
NAME
20kbps
ROUT
TOUT
GND
20kbps
C1+
C2+
V
C1-
C2-
RIN
TIN
EN
V+
2000
V-
CC
120kbps
120kbps
3000
250kbps
4000
250kbps
Receiver Enable Control. Drive low for normal operation. Drive high to force the receiver output
(ROUT) into a high-impedance state.
Positive Terminal of the Voltage Doubler Charge-Pump Capacitor
Positive Voltage Generated by the Charge Pump
Negative Terminal of the Voltage Doubler Charge-Pump Capacitor
Positive Terminal of the Inverting Charge-Pump Capacitor
Negative Terminal of the Inverting Charge-Pump Capacitor
Negative Voltage Generated by the Charge Pump
RS-232 Receiver Input, ±15kV ESD protected
TTL/CMOS Receiver Output
Output of the Invalid Signal Detector. INVALID is pulled low if no valid RS-232 level is present on
the receiver input.
TTL/CMOS Transmitter Input
Drive high to override automatic circuitry, keeping transmitter and charge pump on. FORCEOFF
must be high (Table 1).
RS-232 Transmitter Output, ±15kV ESD Protected
Ground
+4.5V to +5.5V Supply Voltage
Force-Off Input, active low. Drive low to shut down transmitter, receiver, and on-board charge
pump. This overrides all automatic circuitry and FORCEON (Table 1).
5000
10
50
40
30
20
0
0
+SLEW
1000
LOAD CAPACITANCE
LOAD CAPACITANCE (pF)
SLEW RATE vs.
2000
-SLEW
3000
Typical Operating Characteristics
FUNCTION
4000
5000
L
, T
A
= +25°C, unless otherwise noted.)
50
40
30
20
10
0
0
CURRENT vs. LOAD CAPACITANCE
120kbps
1000
250kbps
Pin Description
OPERATING SUPPLY
LOAD CAPACITANCE (pF)
2000
3000
20kbps
4000
5000