MAX3385E Maxim Integrated Products, MAX3385E Datasheet

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MAX3385E

Manufacturer Part Number
MAX3385E
Description
Manufacturer
Maxim Integrated Products
Datasheet

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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
19-1437; Rev 1; 10/99
________________General Description
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.
Pin Configurations continued at end of data sheet.
±15kV ESD-Protected, 3.0V to 5.5V, Low-Power,
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.
Hand-Held Equipment
Peripherals
Printers
TOP VIEW
T2OUT
R2IN
N.C.
N.C.
C1+
C2+
C1-
C2-
V+
V-
________________________________________________________________ Maxim Integrated Products
up to 250kbps, True RS-232 Transceiver
10
1
2
3
8
4
5
6
7
9
MAX3385E
Pin Configurations
SSOP
Battery-Powered
Equipment
20
19
18
17
16
15
14
13
12
11
SHDN
V
GND
T1OUT
R1IN
R1OUT
T1IN
R2OUT
N.C.
T2IN
CC
o ESD Protection for RS-232 I/O Pins
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
____________________________Features
MAX3385ECAP
MAX3385ECWN
MAX3385EEAP
*
C3 CAN BE RETURNED TO EITHER V
NOTE: SEE TABLE 2 FOR CAPACITOR SELECTION
TTL/CMOS
TTL/CMOS
OUTPUTS
PART
±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap Discharge
C
INPUTS
BYPASS
0.1µF
0.1µF
C2
C1
+3.3V
Typical Operating Circuit
T1IN
T2IN
C1+
C1-
C2-
C2+
R1OUT
R2OUT
-40°C to +85°C
TEMP. RANGE
Ordering Information
0°C to +70°C
0°C to +70°C
CC
OR GROUND.
MAX3385E
GND
V
CC
T1OUT
T2OUT
SHDN
5k
R1IN
R2IN
5k
V+
V-
PIN-PACKAGE
20 SSOP
18 SO
20 SSOP
C3
0.1µF
C4
0.1µF
RS-232
OUTPUTS
RS-232
INPUTS
*
1

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MAX3385E Summary of contents

Page 1

... 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. ...

Page 2

... SSOP (derate 8.00mW/°C above +70°C) ..........640mW 18-Pin SO (derate 9.52mW/°C above +70°C)...............762mW Operating Temperature Ranges MAX3385ECAP ....................................................0°C to +70°C MAX3385ECWN ...................................................0°C to +70°C MAX3385EEAP .................................................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10sec) .............................+300°C + 0.3V +25° ...

Page 3

ESD-Protected, 3.0V to 5.5V, Low-Power 250kbps, True RS-232 Transceiver ELECTRICAL CHARACTERISTICS (continued +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10 unless ...

Page 4

ESD-Protected, 3.0V to 5.5V, Low-Power 250kbps, True RS-232 Transceiver __________________________________________Typical Operating Characteristics (V = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and C CC TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE ...

Page 5

... 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. ...

Page 6

... The IEC 1000-4-2 standard covers ESD testing and per- formance of finished equipment; it does not specifically refer to integrated circuits. The MAX3385E helps you design equipment that meets Level 4 (the highest level) of IEC 1000-4-2, without the need for additional ESD-pro- tection components ...

Page 7

ESD-Protected, 3.0V to 5.5V, Low-Power 250kbps, True RS-232 Transceiver 1500Ω DISCHARGE CHARGE-CURRENT RESISTANCE LIMIT RESISTOR HIGH STORAGE VOLTAGE 100pF CAPACITOR DC SOURCE Figure 3a. Human Body ESD Test Model R ...

Page 8

... Table 3 for more information on possible combinations of interconnections. T1IN V+ C3 T1OUT V- C4 R1OUT Figure 7. MAX3385E Loopback Test Result at 120kbps 1000pF T1IN T1OUT R1OUT Figure 8. MAX3385E Loopback Test Result at 250kbps V = 3.3V CC C1–C4 = 0.1µF 2µs/div 5V/div 5V/div 5V/div V = 3.3V CC C1–C4 = 0.1µF 2µs/div ...

Page 9

... CMOS families Compatible with all TTL and CMOS families Compatible with ACT and HCT CMOS, and with AC, HC, or CD4000 CMOS ___________________Chip Information TRANSISTOR COUNT: 1129 18 N.C. 1 SHDN 17 C1 GND 15 T1OUT C1- 4 MAX3385E 14 C2+ R1IN 5 13 R1OUT C2 T1IN 7 T2OUT T2IN R2OUT R2IN SO 9 ...

Page 10

ESD-Protected, 3.0V to 5.5V, Low-Power 250kbps, True RS-232 Transceiver ________________________________________________________Package Information 10 ______________________________________________________________________________________ ...

Page 11

ESD-Protected, 3.0V to 5.5V, Low-Power 250kbps, True RS-232 Transceiver ______________________________________________________________________________________ Package Information (continued) 11 ...

Page 12

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1999 Maxim Integrated Products ...

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