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PDF DS275E Data sheet ( Hoja de datos )
| Número de pieza | DS275E | |
| Descripción | Line-Powered RS-232 Transceiver Chip | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de DS275E (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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www.dalsemi.com
DS275
Line-Powered RS-232 Transceiver Chip
FEATURES
Low-power serial transmitter/receiver for
battery-backed systems
Transmitter steals power from receive signal
line to save power
Ultra-low static current, even when connected
to RS-232-E port
Variable transmitter level from +5 to +12
volts
Compatible with RS-232-E signals
Available in 8-pin, 150 mil wide SOIC
package (DS275S)
Low-power CMOS
ORDERING INFORMATION
DS275
8-pin DIP
DS275S
8-pin SOIC
DS275E
14-pin TSSOP
PIN ASSIGNMENT
RXOUT
VDRV
TXIN
1
2
3
8 VCC
7 RXIN
6 NC
GND 4
5 TXOUT
DS275 8-Pin DIP (300-mil)
DS275 8-Pin SOIC (150-mil)
RXOUT
NC
VDRV
NC
TXIN
NC
GND
1
2
3
4
5
6
7
14 VCC
13 NC
12 NC
11 RXIN
10 NC
9 NC
8 TXOUT
DS275E 14-Pin TSSOP
PIN DESCRIPTION
RXOUT
VDRV
TXIN
GND
- RS-232 Receiver Output
- Transmit driver +V
- RS-232 Driver Input
- System Ground (0V)
TXOUT
NC
- RS-232 Driver Output
- No Connection
RXIN
VCC
- RS-232 Receive Input
-System Logic Supply (+5V)
DESCRIPTION
The DS275 Line-Powered RS-232 Transceiver Chip is a CMOS device that provides a low-cost, very
low-power interface to RS-232 serial ports. The receiver input translates RS-232 signal levels to common
CMOS/TTL levels. The transmitter employs a unique circuit which steals current from the receive RS-
232 signal when that signal is in a negative state (marking). Since most serial communication ports
remain in a negative state statically, using the receive signal for negative power greatly reduces the
DS275’s static power consumption. This feature is especially important for battery-powered systems such
as laptop computers, remote sensors, and portable medical instruments. During an actual communication
session, the DS275’s transmitter will use system power (5-12 volts) for positive transitions while still
employing the receive signal for negative transitions.
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RXIN
TXIN
TXOUT
RXOUT
Storage Temperature
Operating Temperature
±15 volts
-0.3 to VCC + 0.3 volts
±15 volts
-0.3 to VCC + 0.3 volts
-55°C to +125°C
0°C to 70°C
DS275
* This is a stress rating only and functional operation of the device at these or any other conditions
above those indicated in the operation sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods of time may affect reliability.
RECOMMENDED DC OPERATING CONDITIONS
PARAMETER
SYMBOL MIN TYP
Logic Supply
Transmit Driver Supply
Logic 1 Input
Logic 0 Input
RS-232 Input Range (RXIN)
VCC
VDRV
VIH
VIL
VRS
4.5 5.0
4.5 5-12
2.0
-0.3
-15
Dynamic Supply Current
TXIN = VCC
TXIN = GND
IDRV1
ICC1
IDRV1
ICC1
400
40
3.8
40
Static Supply Current
TXIN = VCC
TXIN = GND
IDRV2
ICC2
IDRV2
ICC2
1.5
10.0
3.8
10.0
Driver Leakage
Current (VCC=0V)
IDRV3
0.05
MAX
5.5
13.0
VCC+0.3
+0.8
+15
800
100
5.0
100
10.0
15.0
5.0
20.0
1.0
UNITS
V
V
V
V
V
µA
µA
µA
µA
µA
µA
mA
µA
µA
NOTES
1
1
2
3
4
5
5 of 8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet DS275E.PDF ] | |
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