FEATURES
• 3 Driver / 2 Receiver Architecture
• Logic selector function (VL) sets TTL
input/output levels for mixed logic systems
• Meets true EIA/TIA-232-F Standards from
a +3.0V to +5.5V power supply
• Interoperable with EIA/TIA-232 and
adheres to EIA/TIA-562 down to a +2.7V
power source
• Minimum 250Kbps data rate under load
• Regulated Charge Pump Yields Stable
RS-232 Outputs Regardless of V
CC
Variations
• ESD Specifications:
+5KV Human Body Model
+5KV IEC6000-4-2 Air Discharge
+8KV IEC6000-4-2 Contact Discharge
• Applications
• Palmtops
• Cell phone Data Cables
• PDA's
DESCRIPTION
The SP3203E provides a RS-232 transceiver solution for portable and hand-held applications
such as palmtops, PDA's and cell phones. The SP3203Euses an internal high-efficiency,
charge-pump power supply that requires only 0.µF capacitors during 3.3V operation. This
charge pump and Exar's driver architecture allow the SP3203E
to deliver compliant RS-232 performance from a single power supply ranging from +3.0V to +5.5V.
The SP3203E is a 3-driver/2-receiver device, with a unique VL pin to program the TTL input and output logic levels to allow inter operation in mixed-logic voltage systems such as PDA's and cell phones. Receiver outputs will not exceed VL or VOH and transmitter input logic levels are scaled by the magnitude of the VL input.
|
Name
|
Function |
PIN# |
|
V+
|
Regulated +5.5V output generated by charge pump |
2 |
|
C-
|
Negative terminal of the voltage doubler charge-pump capacitor |
3 |
|
C2+
|
Positive terminal of the inverting charge-pump capacitor |
4 |
|
C2-
|
Negative terminal of the inverting charge-pump capacitor |
5 |
