MAX221E Datasheet, PDF (1/12 Pages) Maxim Integrated Products – ±15kV ESD-Protected, +5V, 1uA, Single RS-232 Transceiver with AutoShutdown

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.
Applications
Maintenance/Diagnostic Ports
Industrial Systems
Telecommunications
Set-Top Boxes
Pin Configuration
TOP VIEW
EN 1
C1+ 2
V+ 3
C1- 4
C2+ 5
C2- 6
V- 7
RIN 8
MAX221E
16 FORCEOFF
15 V_CC
14 GND
13 TOUT
12 FORCEON
11 TIN
10 INVALID
9 ROUT
TSSOP/SSOP
AutoShutdown is a trademark of Maxim Integrated Products.
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
PART
MAX221ECUE
MAX221ECAE
MAX221EEUE
MAX221EEAE
Ordering Information
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
Typical Operating Circuit
+5V
C_BYPASS
0.1µF
C1
0.1µF
C2
0.1µF
2 _C1+
4 _C1-
5 _C2+
6 _C2-
11 TIN
15
V_CC
MAX221E
3
V+
C3
0.1µF
7
V-
TOUT 13
C4
0.1µF
9 ROUT
RIN 8
5k
1 _EN
12 _FORCEON
GND
14
10
INVALID
FORCEOFF ¹⁶
TO POWER-
MANAGEMENT
UNIT
V_CC
CAPACITORS MAY BE
POLARIZED OR UNPOLARIZED.
________________________________________________________________ Maxim Integrated Products 1
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