MAX338 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – ±15kV ESD-Protected, 3.0V to 5.5V, Low-Power, up to 250kbps, True RS-232 Transceiver

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 V_CC
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
C_BYPASS
C1
0.1µF
C2
0.1µF
TTL/CMOS
INPUTS
V_CC
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
5k
R2OUT
R2IN
5k
GND
SHDN
RS-232
INPUTS
SSOP
Pin Configurations continued at end of data sheet.
* C3 CAN BE RETURNED TO EITHER V_CC 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.}
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