|
|
PDF MAX3227 Data sheet ( Hoja de datos )
| Número de pieza | MAX3227 | |
| Descripción | RS-232 Transceivers | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX3227 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
|
No Preview Available !
MAX3224–MAX3227/
AVAILABLE
MAX3244/MAX3245
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
________________General Description
The MAX3224–MAX3227/MAX3244/MAX3245 are 3V-
powered EIA/TIA-232 and V.28/V.24 communications
interfaces with automatic shutdown/wakeup features
and high data-rate capabilities.
All devices achieve a 1µA supply current using Maxim’s
revolutionary AutoShutdown Plus™ feature. These
devices automatically enter a low-power shutdown
mode when the RS-232 cable is disconnected or the
transmitters of the connected peripherals are inactive,
and the UART driving the transmitter inputs is inactive
for more than 30 seconds. They turn on again when
they sense a valid transition at any transmitter or receiv-
er input. AutoShutdown Plus saves power without
changes to the existing BIOS or operating system.
The MAX3225/MAX3227/MAX3245 also feature
MegaBaud™ operation, guaranteeing 1Mbps for high-
speed applications such as communicating with ISDN
modems. The MAX3224/MAX3226/MAX3244 guarantee
250kbps operation. The transceivers have a proprietary
low-dropout transmitter output stage enabling 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 MAX3224–MAX3227 feature a logic-level output
(READY) that asserts when the charge pump is regulat-
ing and the device is ready to begin transmitting.
All devices are available in a space-saving TQFN,
TSSOP, and SSOP packages.
_______________F__u_n_c__ti_o_n_Aapl pDliiacgartaiomnss
Notebook, Subnotebook, and Palmtop Computers
Cellular Phones
Battery-Powered Equipment
Handheld Equipment
Peripherals
Printers
PAinutoCSohnufitgduorwantioPnluss,aMppeegaarBaatuedn,danodf dUaCtaSPshaereet.trademarks
FoufnMcatixoimnaIlnDteiaggraratemdsPcroodnuticntuse, dInact. end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
_Next Generation Device Features
♦ For Smaller Packaging:
MAX3228/MAX3229: +2.5V to +5.5V RS-232
Transceivers in UCSP™
♦ For Low-Voltage or Data Cable Applications:
MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA,
2 Tx/2 Rx RS-232 Transceivers with ±15kV ESD-
Protected I/O and Logic Pins
♦ For Integrated ESD Protection:
MAX3222E/MAX3232E/MAX3237E/MAX3241E/
MAX3246E: ±15kV ESD-Protected, Down to 10nA,
+3.0V to +5.5V, Up to 1Mbps, True RS-232
Transceivers (MAX3246E Available in UCSP)
_______________Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX3224CPP+
0°C to +70°C 20 PDIP
MAX3224CAP+
0°C to +70°C 20 SSOP
MAX3224CTP+
0°C to +70°C 20 TQFN-EP*
MAX3224CUP+
0°C to +70°C 20 TSSOP
MAX3224EPP+
-40°C to +85°C 20 PDIP
MAX3224EAP+
-40°C to +85°C 20 SSOP
MAX3224ETP+
-40°C to +85°C 20 TQFN-EP*
MAX3224EUP+
-40°C to +85°C 20 TSSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Ordering Information continued at end of data sheet.
_____________________ Selector Guide
PART
NO. OF
DRIVERS/
RECEIVERS
GUARANTEED
DATA RATE
(bps)
READY
OUTPUT
Auto-
Shutdown
Plus
MAX3224
MAX3225
MAX3226
MAX3227
MAX3244
MAX3245
2/2
2/2
1/1
1/1
3/5
3/5
250k ✔ ✔
1M ✔ ✔
250k ✔ ✔
1M ✔ ✔
250k — ✔
1M — ✔
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-1289; Rev 5; 2/11
1 page  
MAX3224–MAX3227/MAX3244/MAX3245
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
__________________________________________Typical Operating Characteristics
(VCC = +3.3V, 250kbps data rate, C1–C4 = 0.1µF, all transmitters loaded with 3kΩ and CL, TA = +25°C, unless otherwise noted.)
MAX3224/MAX3226
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
6
5
4
VOUT+
3
T1 TRANSMITTING AT 250kbps
2 T2 (MAX3224) TRANSMITTING AT 15.6kbps
1
0
-1
-2
-3
-4
-5
VOUT-
-6
0
1000 2000 3000 4000 5000
LOAD CAPACITANCE (pF)
MAX3225/MAX3227
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
7.5
5.0
2Mbps
2.5 1.5Mbps 1Mbps
1 TRANSMITTER AT FULL DATA RATE
0 1 TRANSMITTER AT 1/16 DATA RATE
(MAX3225)
-2.5 LOAD = 3kΩ + CL 2Mbps 1.5Mbps 1Mbps
-5.0
-7.5
0
500 1000 1500 2000 2500
LOAD CAPACITANCE (pF)
MAX3225/MAX3227
TRANSMITTER SKEW vs.
LOAD CAPACITANCE
50
45 1 TRANSMITTER AT 512kbps
1 TRANSMITTER AT 30kbps
40 (MAX3225)
35 LOAD = 3kΩ + CL
30
25
20
15 AVERAGE; 10 PARTS
10
5
0
0
500 1000 1500 2000 2500 3000
LOAD CAPACITANCE (pF)
MAX3224/MAX3226
SLEW RATE vs. LOAD CAPACITANCE
16
14
12
-SLEW
10
+SLEW
8
6
4
2
FOR DATA RATES UP TO 250kbps
0
0 1000 2000 3000 4000
LOAD CAPACITANCE (pF)
5000
MAX3225/MAX3227
SLEW RATE vs. LOAD CAPACITANCE
80
70
60
50
+SLEW
40
-SLEW
30
20
10 1 TRANSMITTER AT 1Mbps
1 TRANSMITTER AT 62.5kbps (MAX3225)
0
0 500 1000 1500 2000
LOAD CAPACITANCE (pF)
2500
MAX3224–MAX3227
READY TURN-ON TIME
vs. TEMPERATURE
38
36
34
32
30
28
26
24
22
20
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
MAX3224/MAX3226
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
45
40
35 250kbps
30 120kbps
25
20
20kbps
15
10
5 T1 TRANSMITTING AT 250kbps
T2 (MAX3224) TRANSMITTING AT 15.6kbps
0
0 1000 2000 3000 4000 5000
LOAD CAPACITANCE (pF)
MAX3225/MAX3227
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
100
90 1 TRANSMITTER AT FULL DATA RATE
1 TRANSMITTER AT 1/16 DATA RATE
80 (MAX3225)
70 LOAD = 3kΩ + CL
60 2Mbps
50
1.5Mbps
40
30
1Mbps
20
10
0
0
500 1000 1500 2000
LOAD CAPACITANCE (pF)
2500
MAX3224–MAX3227
READY TURN-OFF TIME
vs. TEMPERATURE
200
180
160
140
120
100
80
60
40
20
0
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
Maxim Integrated
5
5 Page 
MAX3224–MAX3227/MAX3244/MAX3245
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
RECEIVER
INPUTS
} INVALID
REGION
TRANSMITTER
INPUTS
TRANSMITTER
OUTPUTS
INVALID
OUTPUT
VCC
tINVL
0
*VCC
OUTPUT
0
tINVH
tAUTOSHDN
tAUTOSHDN
tWU
tWU
V+
VCC
0
V-
*MAX3224–MAX3227
Figure 4b. AutoShutdown Plus, INVALID, and READY Timing Diagram
By connecting FORCEON to INVALID, the MAX3224–
MAX3227/MAX3244/MAX3245 shut down when no valid
receiver level and no receiver or transmitter edge is
detected for 30sec, and wake up when a valid receiver
level or receiver or transmitter edge is detected.
By connecting FORCEON and FORCEOFF to INVALID,
the MAX3224–MAX3227/MAX3244/MAX3245 shutdown
when no valid receiver level is detected and wake up
when a valid receiver level is detected (same function-
ality as AutoShutdown feature on MAX3221/MAX3223/
MAX3243).
A mouse or other system with AutoShutdown Plus may
need time to wake up. Figure 5 shows a circuit that
forces the transmitters on for 100ms, allowing enough
time for the other system to realize that the MAX3244/
MAX3245 is awake. If the other system outputs valid
RS-232 signal transitions within that time, the RS-232
ports on both systems remain enabled.
POWER-
MANAGEMENT
UNIT
MASTER SHDN LINE
0.1μF 1MΩ
FORCEOFF FORCEON
MAX3224
MAX3225
MAX3226
MAX3227
MAX3244
MAX3245
Figure 5. AutoShutdown Plus Initial Turn-On to Wake Up a
Mouse or Another System
Maxim Integrated
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MAX3227.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX322 | Precision / Dual-Supply / SPST Analog Switches | Maxim Integrated |
| MAX3221 | MAX3221 3-V to 5.5-V RS-232 Line Driver and Receiver With 15-kV ESD Protection (Rev. O) |  Texas Instruments |
| MAX3221 | 1A Supply Current / True +3V to +5.5V RS 232 Transceiver with AutoShutdown | Maxim Integrated |
| MAX3221 | 1A Supply Current / True +3V to +5.5V RS 232 Transceiver with AutoShutdown | Maxim Integrated |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |