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PDF MAX3322E Data sheet ( Hoja de datos )
| Número de pieza | MAX3322E | |
| Descripción | (MAX3322E / MAX3323E) RS-232 Transceivers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-2667; Rev 1; 1/03
±15kV ESD-Protected, RS-232 Transceivers for
Multidrop Applications
General Description
The MAX3322E/MAX3323E 3.0V to 5.5V powered
EIA/TIA-232 and V.28/V.24 communications interfaces
are designed for multidrop applications with low power
requirements, high data-rate capabilities, and
enhanced electrostatic discharge (ESD) protection. 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.
The MAX3322E/MAX3323E have pin-selectable
5kΩ/high-impedance RS-232 receivers. These devices
are capable of receiving data in high-impedance mode.
In multidrop applications, one receiver has a 5kΩ input
resistance, while the other receivers are high imped-
ance to ensure the RS-232 standard is observed. Logic
control permits selection of the functional mode: high
impedance or RS-232 standard load. The transmitters
are enabled by logic control to allow the multiplexing of
the inputs to a single UART.
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 MAX3322E/MAX3323E are
capable of running at data rates up to 250kbps while
maintaining RS-232-compliant output levels. The
MAX3322E/MAX3323E have a unique VL pin that allows
operation in mixed-logic voltage systems. Both input
and output logic levels are pin programmable through
the VL pin.
The MAX3322E is a 2Tx/2Rx device for hardware hand-
shaking in standard RS-232 mode, and the MAX3323E
is a 1Tx/1Rx, required in most multidrop applications.
The MAX3322E is offered in a space-saving TSSOP
package. The MAX3323E is offered in 16-pin DIP and
space-saving TSSOP packages.
Applications
Bar-Code Scanners
Video Security
Industrial Data Acquisition
Data Splitters
Features
o Pin-Selectable 5kΩ/High-Impedance Receivers
o Transmitter Outputs Three-Stated by Logic
Control
o VL Pin for Compatibility with Mixed Voltage
Systems
o 1Tx/1Rx (MAX3323E) or 2Tx/2Rx (MAX3322E)
Versions
o 250kbps Data Rate
o 1µA Low-Power Shutdown
o High 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
PART
MAX3322E EUP
MAX3323E EUE
MAX3323EEPE
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 TSSOP
16 TSSOP
16 DIP
Pin Configurations
TOP VIEW
C1+ 1
V+ 2
C1- 3
C2+ 4
C2- 5
V- 6
TOUT2 7
RIN2 8
TOUT1 9
RIN1 10
MAX3322E
20 VCC
19 GND
18 SHDN
17 VL
16 RENABLE
15 TXENABLE
14 TIN2
13 ROUT2
12 TIN1
11 ROUT1
TSSOP
Typical Operating Circuit and Functional Diagram appear
at end of data sheet.
Pin Configurations continued at end of data sheet.
________________________________________________________________ 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.
1 page  
www.DataSheet4U.com
±15kV ESD-Protected, RS-232 Transceivers for
Multidrop Applications
Pin Description
PIN
MAX3322E MAX3323E
11
22
33
44
55
66
7, 9 7
8, 10
8
11, 13
9
12, 14
10
15 11
NAME
FUNCTION
C1+
V+
C1-
C2+
C2-
V-
TOUT_
RIN_
ROUT_
TIN_
TXENABLE
Positive Terminal of the Voltage-Doubler Charge-Pump Capacitor
+5.5V 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
-5.5V Generated by the Charge Pump
Transmitter Output
Receiver Input
Receiver Output
Transmitter Input
Transmitter Enable. Drive TXENABLE high to enable transmitter. Drive TXENABLE low
to put transmitter into high impedance.
Receiver Termination Enable. Drive RENABLE high for normal RS-232 5kΩ termination.
16 12 RENABLE Drive RENABLE low to make receiver inputs high impedance. In either case, the
receiver and its output are enabled.
17
13
VL
Logic-Level Supply. All CMOS inputs and outputs are referred to VL, which is from
1.65V to 5.5V.
Shutdown Input. Drive SHDN low to put device into shutdown mode. Drive SHDN high
18 14 SHDN for normal operation. In shutdown, all transmitter and receiver outputs are in three-state;
receiver inputs are high impedance.
19 15 GND Ground
20 16 VCC +3V to +5.5V Input Voltage. Bypass VCC to GND with a 0.1µF capacitor.
Detailed Description
The MAX3322E/MAX3323E are RS-232 transceivers for
multidrop applications (i.e., multiple-receiver operation).
The devices are pin selectable between standard RS-232
operation with 5kΩ input resistance receivers or high-
input-impedance receivers. Receivers of the MAX3322E/
MAX3323E remain active in both modes of operation. In
multidrop applications, a selected receiver is set at a 5kΩ
input resistance, while the others are high-input imped-
ance, maintaining RS-232 standards. Logic control per-
mits selection of the functional mode: high impedance or
normal load. The transmitters are enabled by logic control
to allow transmission-line sharing.
The logic supply input (VL) controls the levels of the
system’s I/O and works from 1.65V to 5.5V, providing
compatibility with lower microprocessor I/O voltages.
The transmitters are inverting level translators that con-
vert CMOS logic levels into RS-232-compatible levels.
They guarantee 250kbps with loads of RL = 3kΩ and CL
= 1000pF. The transmitters are enabled or disabled
(three-stated) by the logic control TXENABLE, which
manages transmission-line sharing in multidrop applica-
tions. When TXENABLE is high, the transmitter is
enabled. When TXENABLE is low, the transmitter is put
in high-impedance state. The receivers can be used in
two conditions, selectable by the logic control RENABLE.
When RENABLE is high, the internal 5kΩ resistor is con-
nected across receiver input and ground. When
RENABLE is low, the receiver input is high impedance,
while maintaining receiving capability.
In shutdown mode, all transmitter and receiver outputs
are three-stated, receiver inputs are in high impedance,
the charge pump is turned off, V+ decays to VCC, and
V- decays to ground. ESD protection structures are
incorporated in all pins to protect against ESD events
encountered during handling and assembly. The
receiver inputs and the transmitter outputs have ±15kV
ESD structure implementation.
_______________________________________________________________________________________ 5
5 Page 
www.DataSheet4U.com
±15kV ESD-Protected, RS-232 Transceivers for
Multidrop Applications
Typical Operating Circuit
+3.3V
C1
0.1µF
C2
0.1µF
TTL/CMOS
INPUTS
18
SHDN
1 C1+
20
VCC
3 C1-
4
C2+
MAX3322E
5 C2-
12 T1IN
T1OUT
17
VL
V+ 2
6
V-
9
14 T2IN
T2OUT
7
TXENABLE 15
RENABLE 16
11 R1OUT
ENABLE
CONTROL
VL
R1IN 10
C3
0.1µF
C4
0.1µF
RS-232
OUTPUTS
TTL/CMOS
OUTPUTS
13 R2OUT
VL
5kΩ
R2IN 8
RS-232
INPUTS
GND
19
5kΩ
Pin Configurations (continued)
TOP VIEW
C1+ 1
V+ 2
C1- 3
C2+ 4
C2- 5
V- 6
TOUT1 7
RIN1 8
MAX3323E
16 VCC
15 GND
14 SHDN
13 VL
12 RENABLE
11 TXENABLE
10 TIN1
9 ROUT1
TSSOP/DIP
Functional Diagram
MAX3322E
MAX3323E
VCC
VL
ROUT
RENABLE
C1+ C1- C2+ C2-
CHARGE PUMP
HIGH
IMPEDANCE
V+
V-
RIN
5kΩ
Chip Information
TRANSISTOR COUNT: 1294
PROCESS: BiCMOS
TIN
SHDN
TXENABLE
VL V+
V-
TOUT
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX3322E.PDF ] | |
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