MAX3243
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
SLLS350B – APRIL 1999 – REVISED JANUARY 2000
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description
The MAX3243 device consists of three line drivers, five line receivers, and a dual charge-pump circuit with
±15-kV
ESD protection pin-to-pin (serial-port connection pins, including GND). The device meets the
requirements of TIA/EIA-232-F and provides the electrical interface between an asynchronous communication
controller and the serial-port connector. This combination of drivers and receivers matches that needed for the
typical serial port used in an IBM PC/AT, or compatible. The charge pump and four small external capacitors
allow operation from a single 3-V to 5.5-V supply. In addition, the device includes an always-active noninverting
output (ROUT2B), which allows applications using the ring indicator to transmit data while the device is powered
down. The device operates at data signaling rates up to 250 kbit/s and a maximum of 30-V/µs driver output slew
rate.
Flexible control options for power management are available when the serial port is inactive. The
auto-powerdown feature functions when FORCEON is low and FORCEOFF is high. During this mode of
operation, if the device does not sense a valid RS-232 signal, the driver outputs are disabled. If FORCEOFF
is set low, both drivers and receivers (except ROUT2B) are shut off, and the supply current is reduced to 1
µA.
Disconnecting the serial port or turning off the peripheral drivers causes the auto-powerdown condition to occur.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
AT, IBM, and PC are trademarks of International Business Machines Corporation.
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
Copyright
©
2000, Texas Instruments Incorporated
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
1
PRODUCT PREVIEW
Single-Chip and Single-Supply Interface for
IBM™ PC/AT™ Serial Port
Meets or Exceeds the Requirements of
TIA/EIA-232-F and ITU v.28 Standards
Operates With 3-V to 5.5-V V
CC
Supply
Always-Active Noninverting Receiver
Output (ROUT2B)
Operates up to 250 kbit/s
Low Standby Current . . . 1
µA
Typical
External Capacitors . . . 4
×
0.1
µF
Accepts 5-V Logic Input With 3.3-V Supply
Designed to Be Interchangeable With
Maxim MAX3243
Serial-Mouse Driveability
RS-232 Bus-Pin ESD Protection Exceeds
±15-kV
Using Human-Body Model (HBM)
Applications
– Battery-Powered Systems, PDAs,
Notebooks, Laptops, Palmtop PCs, and
Hand-Held Equipment
Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), and Thin Shrink Small-Outline (PW)
Packages
DB, DW, OR PW PACKAGE
(TOP VIEW)
C2+
C2–
V–
RIN1
RIN2
RIN3
RIN4
RIN5
DOUT1
DOUT2
DOUT3
DIN3
DIN2
DIN1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
C1+
V+
V
CC
GND
C1–
FORCEON
FORCEOFF
INVALID
ROUT2B
ROUT1
ROUT2
ROUT3
ROUT4
ROUT5
TI [ TEXAS INSTRUMENTS ]
