MAX3387E Datasheet, PDF (1/16 Pages) Maxim Integrated Products – 3V, ±15kV ESD-Protected, AutoShutdown Plus RS-232 Transceiver for PDAs and Cell Phones

19-1561; Rev 1; 10/99
3V, ±15kV ESD-Protected, AutoShutdown Plus
RS-232 Transceiver for PDAs and Cell Phones
General Description
The MAX3387E 3V powered EIA/TIA-232 and V.28/V.24
is a communications interface with low power require-
ments, high data-rate capabilities, and enhanced elec-
trostatic discharge (ESD) protection. The MAX3387E
has three receivers and three transmitters. All RS-232
inputs and outputs are protected to ±15kV using the
IEC 1000-4-2 Air-Gap Discharge method, ±8kV using
the IEC 1000-4-2 Contact Discharge method, and
±15kV using the Human Body Model.
A proprietary low-dropout transmitter output stage
enables true RS-232 performance from a +3.0V to
+5.5V supply with a dual charge pump. The charge
pump requires only four small 0.1µF capacitors for
operation from a +3.3V supply. The MAX3387E is capa-
ble of running at data rates up to 250kbps while main-
taining RS-232 compliant output levels.
The MAX3387E has a unique V_L pin that allows interop-
eration in mixed-logic voltage systems. Both input and
output logic levels are pin programmable through the
V_L pin. The MAX3387E is available in a space-saving
TSSOP package.
Applications
Subnotebook/Palmtop Computers
PDAs and PDA Cradles
Cell Phone Data Cables
Battery-Powered Equipment
Hand-Held Equipment
Peripherals
Pin Configuration
Features
o V_L Pin for Compatibility with Mixed-Voltage
Systems
o ±15kV ESD Protection on Rx Inputs and Tx Outputs
o Low 300µA Supply Current
o Guaranteed 250kbps Data Rate
o 1µA AutoShutdown Plus™ with Receivers Active
o Meets EIA/TIA-232 Specifications Down to 3.0V
PART
MAX3387ECUG
MAX3387EEUG
Ordering Information
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
24 TSSOP
24 TSSOP
Typical Operating Circuit
+3.3V
C_BYPASS
C1
0.1µF
C2
0.1µF
24
23
1
FORCEOFF
C1+
V_CC
3 _C1-
4 _C2+
MAX3387E
5 _C2-
15
V_L
2
V+
6
V-
7 T1IN
T1OUT 21
C3
0.1µF
C4
0.1µF
TOP VIEW
C1+ 1
V+ 2
C1- 3
C2+ 4
C2- 5
V- 6
T1IN 7
T2IN 8
INVALID 9
T3IN 10
FORCEON 11
R3OUT 12
MAX3387E
24 FORCEOFF
23 V_CC
22 GND
21 T1OUT
20 T2OUT
19 T3OUT
18 R1IN
17 R2IN
16 R3IN
15 V_L
14 R1OUT
13 R2OUT
TSSOP
AutoShutdown Plus is a trademark of Maxim Integrated Products.
TTL/CMOS
INPUTS
TTL/CMOS
OUTPUTS
8 T2IN
10 T3IN
V_L
14 R1OUT
V_L
13 R2OUT
V_L
12 R3OUT
9 _INVALID
FORCEON
11
GND
22
T2OUT 20
T3OUT 19
R1IN 18
5k
R2IN 17
5k
R3IN 16
5k
RS-232
OUTPUTS
RS-232
INPUTS
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