19-1527; Rev 0; 8/99
±15kV ESD-Protected, +5V, 1µA, Single RS-232
Transceiver with AutoShutdown
General Description
The MAX221E is a +5V powered, single transmit/
receive RS-232 and V.28 communications interface with
automatic shutdown/wake-up features and high data
rate capabilities.
The MAX221E features enhanced electrostatic discharge
(ESD) protection. Both the transmitter output and receiver
input are protected to ±15kV using the IEC 1000-4-2 Air-
Gap Discharge Method, to ±8kV using the IEC 1000-4-2
Contact Discharge Method, and to ±15kV using the
Human Body Model.
The MAX221E achieves a low 1µA supply current with
Maxim’s revolutionary AutoShutdown™ feature.
AutoShutdown saves power without changes to the
existing BIOS or operating system by entering low-
power shutdown mode when the RS-232 cable is dis-
connected or when the transmitter of the connected
peripheral is off. The MAX221E wakes up and drives the
INVALID
pin high when an active RS-232 cable is con-
nected, signaling the host that a peripheral is connected
to the communications port.
The MAX221E is available in a 16-pin SSOP package as
well as a 16-pin TSSOP that uses 50% less board space
than a 16-pin SO.
Features
o
Single RS-232 Transceiver in a Small 16-Pin TSSOP
o
ESD Protection for RS-232 I/O Pins
±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap Discharge
o
Latchup Free
o
1µA Supply Current
o
AutoShutdown Saves Power without Changes
to BIOS
o
Guaranteed 250kbps Data Rate
MAX221E
Ordering Information
PART
MAX221ECUE
MAX221ECAE
MAX221EEUE
MAX221EEAE
TEMP. RANGE
0°C to +70°C
0°C to +70°C
40°C to +85°C
40°C to +85°C
PIN-PACKAGE
16 TSSOP
16 SSOP
16 TSSOP
16 SSOP
Applications
Maintenance/Diagnostic Ports
Industrial Systems
Telecommunications
Set-Top Boxes
C
BYPASS
0.1µF
+5V
Typical Operating Circuit
15
2 C1+
4 C1-
5
C2+
C2-
TOUT 13
V
CC
V+
3
C3
0.1µF
Pin Configuration
TOP VIEW
EN 1
C1+ 2
V+ 3
C1- 4
C2+ 5
C2- 6
V- 7
RIN 8
16 FORCEOFF
15 V
CC
14 GND
C1
0.1µF
MAX221E
V-
7
C4
0.1µF
C2
0.1µF
6
11 TIN
9 ROUT
5k
RIN 8
MAX221E
13 TOUT
12 FORCEON
11 TIN
10 INVALID
9
ROUT
12
FORCEON
GND
14
FORCEOFF
16
1
EN
INVALID
10
TO POWER-
MANAGEMENT
UNIT
V
CC
TSSOP/SSOP
AutoShutdown is a trademark of Maxim Integrated Products.
CAPACITORS MAY BE
POLARIZED OR UNPOLARIZED.
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
