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PDF MAX3385ECWN Data sheet ( Hoja de datos )
| Número de pieza | MAX3385ECWN | |
| Descripción | 15kV ESD-Protected / 3.0V to 5.5V / Low-Power / up to 250kbps / True RS-232 Transceiver | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1437; Rev 1; 10/99
±15kV ESD-Protected, 3.0V to 5.5V, Low-Power,
up to 250kbps, True RS-232 Transceiver
________________General Description
The MAX3385E is a 3V-powered EIA/TIA-232 and
V.28/V.24 communications interface with low power
requirements, high data-rate capabilities, and en-
hanced electrostatic discharge (ESD) protection. All
transmitter outputs and receiver inputs are protected to
±15kV using IEC 1000-4-2 Air-Gap Discharge, ±8kV
using IEC 1000-4-2 Contact Discharge, and ±15kV
using the Human Body Model.
The transceiver has a proprietary low-dropout transmit-
ter output stage, delivering 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 capac-
itors for operation from a +3.3V supply. Each device is
guaranteed to run at data rates of 250kbps while main-
taining RS-232 output levels.
The MAX3385E has two receivers and two drivers. It
features a 1µA shutdown mode that reduces power con-
sumption and extends battery life in portable systems.
Its receivers can remain active in shutdown mode,
allowing external devices such as modems to be moni-
tored using only 1µA supply current.
The MAX3385E is available in a space-saving SSOP
package in either the commercial (0°C to +70°C) or
extended-industrial (-40°C to +85°C) temperature range.
________________________Applications
Hand-Held Equipment
Peripherals
Printers
Battery-Powered
Equipment
Pin Configurations
TOP VIEW
N.C. 1
C1+ 2
V+ 3
C1- 4
C2+ 5
C2- 6
V- 7
T2OUT 8
R2IN 9
N.C. 10
MAX3385E
20 SHDN
19 VCC
18 GND
17 T1OUT
16 R1IN
15 R1OUT
14 T1IN
13 T2IN
12 R2OUT
11 N.C.
____________________________Features
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 300µA Supply Current
o 1µA Low-Power Shutdown with Receivers Active
o 250kbps Guaranteed Data Rate
o 250µs Time to Exit Shutdown with 3kΩ Load on V+
o 6V/µs Guaranteed Slew Rate
o Meets EIA/TIA-232 Specifications Down to 3.0V
Ordering Information
PART
MAX3385ECAP
MAX3385ECWN
MAX3385EEAP
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
20 SSOP
18 SO
20 SSOP
Typical Operating Circuit
+3.3V
CBYPASS
C1
0.1µF
C2
0.1µF
TTL/CMOS
INPUTS
VCC
C1+ V+
C1-
MAX3385E
C2+
V-
C2-
T1IN T1OUT
T2IN T2OUT
C3*
0.1µF
C4
0.1µF
RS-232
OUTPUTS
TTL/CMOS
OUTPUTS
R1OUT
R1IN
R2OUT
5k
R2IN
5k
GND SHDN
RS-232
INPUTS
SSOP
Pin Configurations continued at end of data sheet.
* C3 CAN BE RETURNED TO EITHER VCC OR GROUND.
NOTE: SEE TABLE 2 FOR CAPACITOR SELECTION
†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; and other patents pending.
________________________________________________________________ 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.
1 page  
±15kV ESD-Protected, 3.0V to 5.5V, Low-Power,
up to 250kbps, True RS-232 Transceiver
VCC
0.1µF
C1+ VCC V+
C1
C1-
MAX3385E
C2+
V-
C2
C2-
T_ IN
T_ OUT
R_ OUT
R_ IN
C3 3k
C4
5k
VCC SHDN
GND
3k 2500pF
VCC
0.1µF
C1+ VCC V+
C1
C1-
MAX3385E
C2+
V-
C2
C2-
T_ IN
T_ OUT
R_ OUT
R_ IN
C3 3k
C4
5k
VCC SHDN
GND
7k 150pF
MINIMUM SLEW-RATE TEST CIRCUIT
MAXIMUM SLEW-RATE TEST CIRCUIT
Figure 1. Slew-Rate Test Circuits
_______________Detailed Description
Dual Charge-Pump Voltage Converter
The MAX3385E’s internal power supply consists of a
regulated dual charge pump that provides output volt-
ages of +5.5V (doubling charge pump) and -5.5V
(inverting charge pump), over the 3.0V to 5.5V VCC
range. The charge pump operates in discontinuous
mode; if the output voltages are less than 5.5V, the
charge pump is enabled, and if the output voltages
exceed 5.5V, the charge pump is disabled. Each
charge pump requires a flying capacitor (C1, C2) and a
reservoir capacitor (C3, C4) to generate the V+ and V-
supplies (Figure 1).
RS-232 Transmitters
The transmitters are inverting level translators that con-
vert CMOS-logic levels to ±5.0V EIA/TIA-232 levels.
The MAX3385E transmitters guarantee a 250kbps data
rate with worst-case loads of 3kΩ in parallel with 1000pF,
providing compatibility with PC-to-PC communication
software (such as LapLink™). Transmitters can be paral-
leled to drive multiple receivers or mice.
Laplink is a trademark of Traveling Software.
The MAX3385E’s transmitters are disabled and the out-
puts are forced into a high-impedance state when the
device is in shutdown (SHDN = GND). The MAX3385E
permits the outputs to be driven up to ±12V in shut-
down.
The transmitter inputs do not have pull-up resistors.
Connect unused inputs to GND or VCC.
RS-232 Receivers
The receivers convert RS-232 signals to CMOS-logic
output levels (Table 1).
Shutdown Mode
Supply current falls to less than 1µA in shutdown mode
(SHDN = low). When shut down, the device’s charge
pumps are shut off, V+ is pulled down to VCC, V- is
pulled to ground, and the transmitter outputs are dis-
abled (high impedance). The time required to exit shut-
Table 1. Shutdown Truth Table
SHDN
T_OUT
R_OUT
0
High-Z
Active
1
Active
Active
_______________________________________________________________________________________ 5
5 Page 
±15kV ESD-Protected, 3.0V to 5.5V, Low-Power,
up to 250kbps, True RS-232 Transceiver
Package Information (continued)
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX3385ECWN.PDF ] | |
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