SP3244ECY-L Exar Corporation, SP3244ECY-L Datasheet - Page 13

• Manufacturer Part Number: SP3244ECY-L
• Description: IC TXRX RS232 28TSSOP
• Manufacturer: Exar Corporation
• Type: Transceiverr

Specifications of SP3244ECY-L

• Package / Case: 28-TSSOP (0.173", 4.40mm Width)
• Number Of Drivers/receivers: 3/5
• Protocol: RS232
• Voltage - Supply: 3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Function: Transceiver
• Mounting Style: SMD/SMT
• Supply Current: 1 uA
• Supply Voltage (max): + 6 V
• Supply Voltage (min): - 0.3 V
• Logic Type: RS-232 Transceivers
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 1016-1129

and drives logic 0 if receiver inputs are float-
ing or driven to ground (see page 4). Driv-
ing the ONLINE pin with the STATUS output
disables Auto On-line
whenever RS-232 voltages are seen on any
receiver inputs. If no RS-232 voltages are seen
on the receiver inputs the Auto On-Line
transceiver will still activate its charge pump
and driver outputs when the driver inputs are
active. This allows the transceiver to signal a
remote Auto On-Line
on the other end of the data cable, to wake up.
The STATUS output pin remains active in all
modes, including SHUTDOWN pin at logic 0.
Connecting STATUS output to drive both
ONLINE and SHUTDOWN will wake the trans-
ceiver if any receiver inputs are driven greater
Auto On-Line
savings in typical operation because the trans-
ceiver will go into low power standby mode
unless a communication link is in use. Signals
such as CTS, RTS, DTR, DSR, or RI will typi-
cally change signal-state to establish hand-
shaking before any actual data-communication
takes place. Transitions on these handshake
signals will wake up the Auto On-Line
transceiver to prepare it for sending data
signals in Auto On-Line
Receiver outputs may be disabled by enter-
ing manual shutdown by driving SHUTDOWN
pin to logic 0. A special non-inverted receiver
output R2OUT remains active in all modes,
including SHUTDOWN pin at logic 0.
delay (greater than t
handshaking transitions and the start of data
communication the transceiver may enter
Auto On-Line
communication begins. The t
is at least 5 seconds and no longer than 60
seconds.
In applications where the transceiver needs to
remain active anytime it is connected to live
RS-232 signals, even if those signals remain
idle for longer than t
output may be used to drive the ONLINE pin.
The STATUS output pin functions the same
in both Auto On-Line
devices. STATUS will output logic 1 if any of
the receiver inputs are driven greater than
±2.7V magnitude by incoming RS-232 signals
(t
Receivers remain active to detect incoming
In some applications if there is a significant
ONLINE
100μs typical).
®
®
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
Plus provides greater power
Plus standby mode before data
OFFLINE
OFFLINE
®
®
®
and Auto On-line
or Auto On-Line
Plus (Forced On-Line)
®
Plus standby mode.
, then the STATUS
) between the
OFFLINE
interval
®
®
Plus
®
®
Plus,
Plus
Plus
3
than ±2.7V magnitude and put the transceiver
into Forced Shutdown mode if all receiver inputs
are floating or driven to ground.
±15KV ESD PROTECTION
ESD-protection structures are incorporated
on all pins to protect against electrostatic
discharges encountered during handling and
assembly. The driver output and receiver inputs
of the SP3244E/3245E have extra protection
against static electricity. Exar uses state-of-the-
art structures to protect these pins against ESD
of ±15kV without damage. The ESD structures
withstand high ESD in all states: normal opera-
tion, shutdown, and powered down. After an
ESD event, the SP3244E/3245E keep working
without latch-up or damage.
ESD protection can be tested in various ways.
The transmitter outputs and receiver inputs of
the SP3244/3245 are characterized for protec-
tion to the following limits:
• ±15kV using the Human Body Model
SP3244E_SP3245E_00_2509
DESCRIPTION