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PDF MAX3319 Data sheet ( Hoja de datos )
| Número de pieza | MAX3319 | |
| Descripción | 2.5V / 1A / 460kbps / RS-232-Compatible Transceivers | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX3319 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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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).
________________________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.
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
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX3316CUP
0°C to +70°C 20 TSSOP
MAX3316CAE
0°C to +70°C 16 SSOP
MAX3316EUP
-40°C to +85°C 20 TSSOP
MAX3316EAE
-40°C to +85°C 16 SSOP
Ordering Information continued at end of data sheet.
Typical Application Circuits
+2.5V
CBYPASS
C1
0.1µF
0.1µF
2 C1+
4 C1-
C2
0.1µF
5 C2+
6 C2-
CMOS
INPUT
11 T1IN
CMOS
OUTPUT
9 R1OUT
15
VCC
MAX3319
3
V+
7
V-
T1OUT 13
R1IN 8
5k
C3
0.1µF
C4
0.1µF
RS-232-
COMPATIBLE
OUTPUT
RS-232-
COMPATIBLE
INPUT
1 READY
12 FORCEON
AutoShutdown INVALID 10
Plus
FORCEOFF 16
GND
14
TO POWER-
MANAGEMENT
UNIT
VCC
Typical Application Circuits continued at end of data sheet.
Selector Guide
PART
MAX3316
MAX3317
MAX3318
MAX3319
NO. OF DRIVERS/ GUARANTEED
RECEIVERS DATA RATE (kbps)
2/2 460
2/2 460
2/2 460
1/1 460
READY OUTPUT
—
—
SHUTDOWN
—
—
—
AutoShutdown
Plus
—
—
________________________________________________________________ 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  
2.5V, 1µA, 460kbps,
RS-232-Compatible Transceivers
Typical Operating Characteristics (continued)
(VCC = +2.5V, C1–C4 = 0.1µF, 460kbps data rate, all transmitters loaded with 3kΩ, TA = +25°C, unless otherwise noted.)
MAX3316/MAX3317
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
35
T1 TRANSMITTING AT SPECIFIED DATA RATE
30 T2 TRANSMITTING AT 20kbps
25
460kbps
20
230kbps
15
10 20kbps
5
0
0 1000 2000 3000
LOAD CAPACITANCE (pF)
MAX3318/MAX3319
SUPPLY CURRENT vs. SUPPLY VOLTAGE
15
460kbps
12
230kbps
9
20kbps
6
T1 TRANSMITTING AT SPECIFIED
3 DATA RATE
T2 TRANSMITTING AT 20kbps
CL = 1000pF
0
2.25 2.45 2.65 2.85 3.05 3.25 3.45 3.65
VCC (V)
MAX3318/MAX3319
TRANSMITTER OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
6
T_OUT+
4
2
T1 TRANSMITTING AT 460kbps
0
T2 TRANSMITTING AT 20kbps
CL = 1000pF
-2
-4 T_OUT-
-6
2.25 2.45 2.65 2.85 3.05 3.25 3.45 3.65
VCC (V)
MAX3318/MAX3319
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
5
4
T_OUT+
3
2
1
T1 TRANSMITTING AT 460kbps
T2 TRANSMITTING AT 20kbps
0
-1
-2
-3
T_OUT-
-4
-5
0
1000 2000
LOAD CAPACITANCE (pF)
3000
MAX3318/MAX3319
SLEW RATE vs. LOAD CAPACITANCE
10
8 -SLEW
6
+SLEW
4
2
FOR DATA RATES UP TO 460kbps
0
0 1000 2000
LOAD CAPACITANCE (pF)
3000
MAX3318/MAX3319
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
35
T1 TRANSMITTING AT SPECIFIED
30
DATA RATE
T2 TRANSMITTING AT 20kbps
25
460kbps
20
230kbps
15
10 20kbps
5
0
0 1000 2000 3000
LOAD CAPACITANCE (pF)
_______________________________________________________________________________________ 5
5 Page 
2.5V, 1µA, 460kbps,
RS-232-Compatible Transceivers
RECEIVER
INPUTS
} INVALID
REGION
TRANSMITTER
INPUTS
TRANSMITTER
OUTPUTS
INVALID
OUTPUT
VCC
tINVL
0
READY *VCC
OUTPUT
0
tINVH
tAUTOSHDN
tWU
V+
VCC
0
V-
*MAX3318/MAX3319
Figure 4b. AutoShutdown Plus, INVALID, and READY Timing Diagram
tAUTOSHDN
tWU
POWER-
MANAGEMENT
UNIT
MASTER SHDN LINE
0.1µF
1MΩ
FORCEOFF FORCEON
MAX3318
MAX3319
Figure 5. AutoShutdown Plus Initial Turn-On to Wake Up a
Mouse or Another System
C2, C3, C4, and CBYPASS to maintain proper ratios
(C1 to other capacitors).
When using the minimum-required capacitor values,
make sure the capacitor value does not degrade exces-
sively with temperature. If in doubt, use capacitors with
a higher nominal value. The capacitor’s equivalent
series resistance (ESR), which usually rises at low tem-
peratures, influences the amount of ripple on V+ and V-.
Power-Supply Decoupling
In most circumstances, a 0.1µF bypass capacitor is
adequate. In applications that are sensitive to power-
supply noise, decouple VCC to ground with a capacitor
of the same value as charge pump capacitor C1.
Connect bypass capacitors as close to the IC as possible.
Transmitter Outputs when
Exiting Shutdown
Figure 2 shows two transmitter outputs when exiting
shutdown mode. As they become active, the two trans-
mitter outputs are shown going to opposite RS-232-
compatible levels (one transmitter input is high, the
other is low). Each transmitter is loaded with 3kΩ in par-
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAX3319.PDF ] | |
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