SP2209E datasheet(7/15 Pages) SIPEX

7 / 15 page

SP2209E DS/06

SP2209E High ESD Dual Port RS-232 Transceivers

DESCRIPTION

The SP2209E device is a rugged, high ESD,

complete dual RS-232 port integrated onto a

single integrated circuit. Six drivers and ten

receivers provide a dual port solution fully

meeting the EIA/TIA-232 and ITU-T V.28/V.24

communication protocols and can be

implemented in applications such as personal

desktop computers and workstations. Refer to

Figure 2 for a typical operating circuit.

Features include high transmission rates, low

power consumption, space saving package

dimensions, and compatibility with the EU

directive on electromagnetic compatibility.

EM compatibility includes protection against

radiated and conducted interference including

high levels of electrostatic discharge. This device

is ideal for operation in electrically harsh

environments or where RS-232 cables are

frequently being plugged and unplugged. This

device is also immune to high RF field strengths

without special shielding precautions. Emissions

are also controlled to within very strict limits.

The SP2209E device features the inverter

portion of Sipex's proprietary and patented

(U.S. 5,306,954) on-board charge pump

circuitry that generates a -9V voltage level from

a single +12V power supply. The SP2209E

device can operate at data rates of at least

460kbps fully loaded.

Its low power CMOS operation makes the

SP2209E device an ideal choice for power

sensitive designs. The SP2209E device has two

receivers, one for each RS-232 port, that

remains active in the standby mode to allow the

monitoring of peripheral devices while the rest

of the system is in a power-saving standby

mode. This allows the SP2209E device to wake

up the entire system when any communication

is initiated in peripheral devices. The SP2209E

device has a low standby current of 100

µA.

THEORY OF OPERATION

The SP2209E device is made up of four

basic circuit blocks: 1. Drivers, 2. Receivers,

the Sipex proprietary charge pump, and

4. Standby circuitry.

Drivers

The drivers are inverting level transmitters

that convert TTL or CMOS logic levels to

EIA/TIA-232 levels with an inverted sense

relative to the input logic levels. With V

DD =

+12V, the typical RS-232 output voltage swing

is +9V with no load and +5V minimum fully

loaded.

Unused driver input may be left

unconnected with an internal pull-up resistor

pulling the inputs high forcing the driver outputs

into a low state. The driver outputs are protected

against infinite short-circuits to ground without

degradation in reliability. These drivers comply

with the EIA-TIA-232F and all previous

RS-232 versions.

The drivers typically can operate at a minimum

data rate of 460kbps fully loaded with 3K

Ω in

parallel with 1000pF, ensuring compatibility

with PC-to-PC communication software. The

SP2209E device is ideal for the new generation

modem standards which require data rates greater

than 460kbps. Refer to Figures 3 and 5 for driver

propagation delay test circuit and waveforms,

respectively.

Receivers

The receivers convert EIA/TIA-232 levels to

TTL or CMOS logic output levels. Should an

unused receiver input be left unconnected, an

internal 5k

Ω pulldown resistor to ground will

commit the output of the receiver to a HIGH

state. Receiver inputs are also protected

against overvoltages of up to +15V. Refer to

Figures 4 and 6 for receiver propagation delay test

circuit and waveforms, respectively.

SP2209E датащи(PDF) 7 Page - Sipex Corporation

SP2209E датащи(HTML) 7 Page - Sipex Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

датащи скачать

ссылки URL