19-1751; Rev 0; 6/00
2.5V, 1µA, 460kbps,
RS-232-Compatible Transceivers
General Description
The MAX3316–MAX3319 transceivers have a proprietary
low-dropout transmitter output stage enabling RS-232-
compatible performance from +2.25V to +3.0V with a
dual-charge pump. These devices require only four
0.1µF capacitors, and are guaranteed to operate at data
rates up to 460kbps.
The MAX3318/MAX3319 achieve a 1µA supply current
using Maxim’s revolutionary AutoShutdown Plus™ fea-
ture. These devices automatically enter a low-power
shutdown mode when the RS-232 cable is disconnected
or the transmitters of the connected peripherals are inac-
tive for more than 30 seconds. They turn on again when
they sense a valid transition at any transmitter or receiver
input. AutoShutdown Plus saves power without changes
to the existing BIOS or operating system. The MAX3318
is a 2-Tx/2-Rx device while the MAX3319 is a 1-Tx/1-Rx
device. These devices also feature a logic-level output
(READY) that asserts when the charge pump is regulat-
ing and the device is ready to begin transmitting.
The MAX3316/MAX3317 are 2-Tx/2-Rx transceivers. The
MAX3317 features a 1µA shutdown mode that can be
entered by driving
SHDN
low. The MAX3317’s receivers
remain active while in shutdown mode, allowing external
devices such as modems to be monitored using only
1µA supply current.
These devices are available in space-saving packages:
MAX3316 (16-pin SSOP and 20-pin TSSOP), MAX3317/
MAX3318 (20-pin SSOP and 20-pin TSSOP), and
MAX3319 (16-pin SSOP).
Features
o
AutoShutdown Plus (MAX3318/MAX3319)
o
300µA Operating Supply Current
o
1µA Low-Power Shutdown with Receivers Active
o
Guaranteed 460kbps Data Rate
o
Guaranteed 4V/µs Slew Rate
o
RS-232 Compatible Down to 2.25V
MAX3316–MAX3319
Ordering Information
PART
MAX3316CUP
MAX3316CAE
MAX3316EUP
MAX3316EAE
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 TSSOP
16 SSOP
20 TSSOP
16 SSOP
Ordering Information continued at end of data sheet.
Typical Application Circuits
+2.5V
C
BYPASS
C1
0.1µF
0.1µF
2 C1+
4 C1-
5
C2
0.1µF
CMOS
INPUT
CMOS
OUTPUT
6
C2+
C2-
T1OUT 13
15
V
CC
V+
3
C3
0.1µF
7
C4
0.1µF
RS-232-
COMPATIBLE
OUTPUT
RS-232-
COMPATIBLE
INPUT
MAX3319
V-
________________________Applications
Palmtop Computers
Hand-Held Instruments
Pagers
Cellular Phones
GPS
Handy Terminals
Hand-Held Electronic Books
AutoShutdown Plus is a trademark of Maxim Integrated Products.
Pin Configurations appear at end of data sheet.
11 T1IN
9 R1OUT
R1IN 8
5k
1
READY
AutoShutdown
Plus
INVALID 10
TO POWER-
MANAGEMENT
UNIT
V
CC
12
FORCEON
GND
14
FORCEOFF 16
Typical Application Circuits continued at end of data sheet.
Selector Guide
PART
MAX3316
MAX3317
MAX3318
MAX3319
NO. OF DRIVERS/
RECEIVERS
2/2
2/2
2/2
1/1
GUARANTEED
DATA RATE (kbps)
460
460
460
460
READY OUTPUT
—
—
SHUTDOWN
—
—
—
AutoShutdown
Plus
—
—
1
________________________________________________________________
Maxim Integrated Products
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.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
