ST3243 ST Microelectronics, ST3243 Datasheet

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ST3243

Manufacturer Part Number
ST3243
Description
RS-232 TRANSCEIVER WITH AUTO-POWERDOWN
Manufacturer
ST Microelectronics
Datasheet

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DESCRIPTION
The ST3243 device consists of 3 drivers, 5
receivers and a dual charge-pump circuit. The
device meets the requirements of EIA/TIA and
V.28/V.24 comunication standards providing high
data rate capability.
The receiver R2 is always active to implement a
wake-up feature for serial port.
The ST3243 has a proprietary low-dropout
transmitter output stage enabling true RS-232
performance from a 3.0V to 5.5V supply with a
dual charge pump. The device is guaranteed to
run at data rates of 250kbps while maintaining
RS-232 output levels.
The Auto-powerdown feature functions when
FORCEON is low and FORCEOFF is high. During
this mode of operation, if the device does not
sense a valid RS-232 signal, the driver outputs are
disabled. If FORCEOFF is set low, both drivers
and receivers (expert R2B) are shut off, and
supply current is reduced to 1mA. Disconnecting
May 2002
1 A SUPPLY CURRENT ACHIEVED WHEN
IN AUTO-POWERDOWN
250Kbps MINIMUM GUARANTEED DATA
RATE
GUARANTEED 6V/ s SLEW RATE RANGE
GUARANTEED MOUSE DRIVEABILITY
0.1 F EXTERNAL CAPACITORS
MEET EIA/TIA-232 SPECIFICATIONS DOWN
TO 3V
AVAILABLE IN SO-28, SSOP-28 AND
TSSOP28
TRANSCEIVER WITH AUTO-POWERDOWN
the serial port or turning off the peripheral drives
causes the auto-powerdown condition to occur.
Auto-powerdown
FORCEON and FORCEOFF are high, and should
be done when driving a serial mouse. With
Auto-powerdown enabled, the device is activated
automatically when a valid signal is applied to any
receiver input.
Typical application are in notebook, subnotebook,
palmtop computers, battery-powered equipment,
hand-held equipment, peripherals and printers.
3 TO 5.5V, 400KBPS, RS-232
SSOP
can
SOP
be
TSSOP
disabled
ST3243
when
1/11

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ST3243 Summary of contents

Page 1

... MEET EIA/TIA-232 SPECIFICATIONS DOWN TO 3V AVAILABLE IN SO-28, SSOP-28 AND TSSOP28 DESCRIPTION The ST3243 device consists of 3 drivers, 5 receivers and a dual charge-pump circuit. The device meets the requirements of EIA/TIA and V.28/V.24 comunication standards providing high data rate capability. The receiver R2 is always active to implement a wake-up feature for serial port ...

Page 2

... ST3243 ORDERING CODES Temperature Type Range ST3243CD °C ST3243BD - °C ST3243CDR °C ST3243BDR - °C ST3243CPR °C ST3243BPR - °C ST3243CTR °C ST3243BTR - °C PIN DESCRIPTION PlN N° ...

Page 3

... The device doesn’t meet 1KV ESD HBM T R OUT OUT HIGH Z HIGH Z ACTIVE * ACTIVE * , FORCE ON = GND shutdown , if no valid RS-232 levels are present on CC Parameter (one at a time) OUT ST3243 R 2OUTB ACTIVE * ACTIVE * Value Unit -0 -0. 0 ...

Page 4

... ST3243 ELECTRICAL CHARACTERISTICS ( 0 5.5V Typical values are referred to T Symbol Parameter I Supply Current ASHDN Auto-powerdown I Shutdown Supply Current SHDN I Supply Current SHDN Auto-powerdown Disabled LOGIC INPUT ELECTRICAL CHARACTERISTICS ( 0 5.5V Typical values are referred to T ...

Page 5

... C = 150pF to 1000pF 150pF to 2500pF L Min. Typ. Max 300 10M Min. Typ. Max. -25 25 0.6 1.2 0.8 1.2 1.5 2.4 1.8 2.4 0 Min. Typ. Max. 250 400 0.15 100 3. ST3243 Unit Unit Unit Kbps 5/11 ...

Page 6

... ST3243 APPLICATION CIRCUITS CAPACITANCE VALUE ( 3.0 to 3.6 0.1 4.5 to 5.5 0.047 3.0 to 5.5 0.22 6/ 0.1 0.1 0.33 0.33 1.0 1.0 C4 Cbypass 0.1 0.1 0.33 0.33 1.0 0.22 ...

Page 7

... TYPICAL PERFORMANCE CHARACTERISTICS (unless otherwise specified T Figure 1 : INVALID HIGH Threshold Time Figure 2 : INVALID LOW Threshold Time Figure 3 : Receiver Propagation Delay = 25°C) j Figure 4 : TReceiver Output Enable & Disable Time Figure 5 : Output Current vs Output High Voltage Figure 6 : Output Current vs Output Low Voltage ST3243 7/11 ...

Page 8

... ST3243 DIM. MIN 0.1 b 0. 17.70 E 10. 7.40 L 0.50 S 8/11 SO-28 MECHANICAL DATA mm. TYP MAX. 2.65 0.3 0.49 0.32 0.5 45° (typ.) 18.10 10.65 1.27 16.51 7.60 1.27 8° (max.) inch MIN. TYP. MAX. 0.104 0.004 0.012 0.014 0.019 0.009 0.012 0.020 0.697 0.713 0.393 0.419 0.050 0.650 0.291 0.300 0.020 0.050 0016023 ...

Page 9

... A2 1.65 b 0.22 c 0.09 D 9 0.65 BSC K 0° L 0.55 TYP MAX. MIN. 2 0.002 1.75 1.85 0.065 0.38 0.009 0.25 0.004 10.2 10.5 0.390 7.8 8.2 0.291 5.3 5.6 0.197 10° 0.75 0.95 0.022 ST3243 inch TYP. MAX. 0.079 0.069 0.073 0.015 0.010 0.402 0.413 0.307 0.323 0.209 0.220 0.0256 BSC 0° 10° 0.030 0.037 9/11 ...

Page 10

... ST3243 DIM. MIN 0.05 A2 0.8 b 0.19 c 0.09 D 9.6 E 6 0° L 0.45 10/11 TSSOP28 MECHANICAL DATA mm. TYP MAX. 1.2 0.15 1 1.05 0.30 0.20 9.7 9.8 6.4 6.6 4.4 4.48 0.65 BSC 8° 0.60 0.75 inch MIN. TYP. MAX. 0.047 0.002 0.004 0.006 0.031 0.039 0.041 0.007 0.012 0.004 0.0089 0.378 0.382 0.386 0.244 0.252 0.260 0.169 0.173 0.176 0.0256 BSC 0° ...

Page 11

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