Radiocrafts
Embedded Wireless Solutions
RC1240/1280/1290
©2011 Radiocrafts AS RC1240/RC1280/RC1290 Data Sheet (rev. 1.62) Page 11 of 26
MAX809R 460 push-pull SC-70/3
Maxim MAX6328_
R25-T
100-
280
2.50 2.562 Open drain,
external pull-
up resistor
SOT-23/3
SC-70/3
Maxim direct
Analog
Devices
ADM809_
Z
140-
460
2.32 2.38 Push-pull SOT-23/3
SC-70/3
Arrow
Texas
Instruments
TPS3800G
27
60-
140
2.5 2.55 Push-pull SC-70/5 Avnet,
Digi-Key
Texas
Instruments
TPS3809J
25
120-
280
2.25 2.30 Push-pull SOT-23/3 Avnet,
Digi-Key
Texas
Instruments
TPS3836J
25
5-15 2.25 2.29 Push-pull SOT-23/5 Avnet,
Digi-Key
Sipex SP810EK-
2-3
100-
1030
2.3 2.346 Push-pull SOT-23/3 Future,
Newark
National
Semiconduc
tor
LM3722E
M5-2.32
100-
560
2.32 2.37 Push-pull SOT-23/5 Future
I/O pin Interfaces
As noted in the Pin Description, RXEN (CTS/RXTX), TXEN (RTS) and CONFIG pins should
have their pull-ups connected to VDD, not VCC. If RXEN is used as CTS (hardware
handshake) or as RXTX (RS485) output, no pull-up is required and should be avoided as this
reduces the voltage swing due to the internal resistor.
Important note: The RXEN (CTS/RXTX) and TXD (SCL) and SDA pins are logic signals with 0
– VDD voltage swing, where VDD is 2.7 V. When connecting these signals to external
circuitry operating on supply voltage above 2.7 V, a level translator may be required. Single
transistor buffers or integrated level translators can be used for this purpose. An example of
such a level translator is SN74LVC1t45.
