MAX3388EEUG Datasheet PDF - Maxim Integrated
| Part Number | MAX3388EEUG | |
| Description | 2.5V / 15kV ESD-Protected RS-232 Transceivers for PDAs and Cell Phones | |
| Manufacturers | Maxim Integrated | |
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19-1845; Rev 1; 9/01
2.5V, ±15kV ESD-Protected RS-232
Transceivers for PDAs and Cell Phones
General Description
The MAX3388E/MAX3389E are 2.5V-powered EIA/TIA-
232 and V.28/V.24 communications interfaces with low
power requirements, high data-rate capabilities, and
enhanced electrostatic discharge (ESD) protection. The
MAX3388E/MAX3389E have two 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.
In addition to the traditional RS-232 I/O, these devices have
dedicated logic-level I/O pins for additional device-to-
device handshaking. During shutdown the logic-level I/O
pins are active for the MAX3389E. An internal 62Ω switch is
provided to switch power to external circuitry or modules.
A proprietary low-dropout transmitter output stage
enables RS-232 compatible performance from a +2.35V
to +3.0V supply with a dual charge pump. The charge
pump requires only four small 0.1µF capacitors for oper-
ation from a +2.5V supply. The MAX3388E/MAX3389E
are capable of running at data rates up to 460kbps while
maintaining RS-232-compatible output levels.
The MAX3388E/MAX3389E have a unique VL pin that
allows interoperation in mixed-logic voltage systems.
Both input and output logic levels are pin programma-
ble through the VL pin. The MAX3388E/MAX3389E are
available in a space-saving TSSOP package.
Typical Operating Circuit
+2.5V
CBYPASS
C1
0.1µF
C2
0.1µF
24 23 14
1 C1+ SHDN
VCC
VL 2
V+
3 C1-
4 C2+
MAX3388E
MAX3389E
6
V-
5 C2-
7 T1IN
T1OUT
21
8 T2IN
T2OUT
20
9 T3IN
13 R1OUT
12 R2OUT
10 LOUT
T3OUT
19
VL
R1IN
18
5kΩ
VL
R2IN
17
5kΩ
SHDN
LIN
16
30kΩ
11
= ±15kV ESD PROTECTION
SWOUT
GND
22
SWIN 15
C3
0.1µF
C4
0.1µF
RS-232
I/O
Covered by U.S Patent numbers 4,636,930; 4,679,134;
4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761.
Features
o VL Pin for Compatibility with Mixed-Voltage
Systems
o Additional I/O for Hot-Sync Applications
o ±15kV ESD Protection on Rx Inputs, Tx Outputs,
LIN, and SWIN
o Low 300µA Supply Current
o Guaranteed 460kbps Data Rate
o 1µA Low-Power Shutdown
o Integrated Switch for Powering Remote Circuitry
o Flow-Through Pinout
o LOUT Active During Shutdown (MAX3389E)
Applications
Subnotebook/Palmtop Computers
PDAs and PDA Cradles
Cell Phone Data Cables
Battery-Powered Equipment
Hand-Held Equipment
Peripherals
Ordering Information
PART
MAX3388ECUG
MAX3388EEUG
MAX3389ECUG
MAX3389EEUG
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
24 TSSOP
24 TSSOP
24 TSSOP
24 TSSOP
Pin Configuration
TOP VIEW
C1+ 1
V+ 2
C1- 3
C2+ 4
C2- 5
V- 6
T1IN 7
T2IN 8
T3IN 9
LOUT 10
SWOUT 11
R2OUT 12
MAX3388E
MAX3389E
TSSOP
24 SHDN
23 VCC
22 GND
21 T1OUT
20 T2OUT
19 T3OUT
18 R1IN
17 R2IN
16 LIN
15 SWIN
14 VL
13 R1OUT
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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2.5V, ±15kV ESD-Protected RS-232
Transceivers for PDAs and Cell Phones
PIN
1
2
3
4
5
6
7, 8, 9
10
11
12, 13
14
15
16
17, 18
19, 20, 21
22
23
24
Pin Description
NAME
C1+
V+
C1-
C2+
C2-
V-
T1IN,
T2IN, T3IN
LOUT
SWOUT
R2OUT,
R1OUT
VL
SWIN
LIN
R2IN,
R1IN
T3OUT,
T2OUT,
T1OUT
GND
VCC
SHDN
FUNCTION
Positive Terminal of the Voltage-Doubler Charge-Pump Capacitor
+4.2V Supply 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
-4.2V Supply Generated by the Charge Pump
CMOS Transmitter Inputs
Handshaking Output. This output is active during shutdown for the MAX3389E.
Switch Output
CMOS Receiver Outputs. Swing between 0 and VL.
Logic-Level Supply. All CMOS inputs and outputs are referred to this supply. VL = +1.8V to +3.0V.
Switch Input.
Handshaking Input. This input is active during shutdown for the MAX3389E.
RS-232 Receiver Inputs
RS-232 Transmitter Outputs
Ground
+2.35V to +3V Supply Voltage
Shutdown Input. 0 = shutdown, switch open; 1 = normal operation, switch closed.
_______________________________________________________________________________________ 5
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| Information | Total 11 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ MAX3388EEUG.PDF Datasheet ] | |
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