AN2262 Motorola / Freescale Semiconductor, AN2262 Datasheet - Page 36

• Manufacturer Part Number: AN2262
• Description: Wireless HC08 Modem
• Manufacturer: Motorola / Freescale Semiconductor

AN2262/D
MC33491 to MC33493 Migration Notes
36
The MC33491 (code name Tango II) is no longer available (as of Q2 2002). The
MC33493 (code name Tango III) is it’s full replacement and within full 3 V-only
environment there’s no change between the basic configurations of these two.
The MC33493 input pins are not specified above V
MC33493 cannot be used within described RF-08 schematics that employ R1
and R3 serial resistors to protect MC33493 3-V interface. Because of reliability
issues, such an interface is not recommended anyway.
For interfacing between a 5-V MCU and a 3-V MC33493, a proper level shifter
must be designed or a different configuration used. An example of such a
configuration is provided in
example and the RF-08 schematic is that a 5 V to 3 V ‘barrier’ is inserted
between the 5-V MC33591/3 (receiver) and the 3-V MCU. Again, correct
voltage level shifting is highly recommended (e.g., using MAX3370/3371 from
Maxim Integrated Products).
Wireless HC08 Modem
Figure
24. The main difference between this
CC
voltage. Thus, the
MOTOROLA