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PDF UT3243 Data sheet ( Hoja de datos )
| Número de pieza | UT3243 | |
| Descripción | +3.0V TO +5.5V POWER SUPPLY 235KBPS MULTICHANNAEL RS-232 LINE DRIVERS - RECEIVERS | |
| Fabricantes | UNISONIC TECHNOLOGIES | |
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Hay una vista previa y un enlace de descarga de UT3243 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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UNISONIC TECHNOLOGIES CO., LTD
UT3243
+3.0V TO +5.5V POWER
SUPPLY, 235KBPS,
MULTICHANNAEL RS-232 LINE
DRIVERS/RECEIVERS
CMOS IC
DESCRIPTION
The UTC UT3243 consists of 3 drivers and 5 receivers. It meets
ElA/TIA-232 and V.28/V.24 specifications, it intended for notebook
computer applications. A high-efficiency, dual charge-pumps power
supply and a low-dropout transmitter combine to deliver true RS-232
performance from a single +3.0V ~ +5.5V power supply. A
guaranteed data rate of 120kbps provides compatibility with popular
software for communicating with PCs.
The UTC UT3243 achieves 1µA supply current in s hutdown condition. When the UT3243 doesn’t detect a val id
signal lev el o n its receiver inputs, the on- board p ower su pply a nd drivers will sh utdown, and when a valid level is
applied to an y RS-232 rec eiver input, then the s ystem turn s on agai n. T herefore, the s ystem saves po wer without
changes to the existing BIOS or operating system.
The UTC UT3243 requires only 0.1µF capacitors in 3.3V operation, and can operate from input vo ltages ranging
from + 3.0V ~ +5.5V. It is ideal for 3.3V-o nly s ystems, 5.0V-only s ystems, or mixed 3.3V and 5.0V s ystems that
require true RS-232 performance.
The UTC UT3243 includes one complementary always-active receiver that can monitor an external device (such
as a mo dem) in shutdown, without for ward biasing the protection diodes in a UART that ma y have VCC completel y
removed.
FEATURES
* Operates With 3.0V ~ 5.5V Power Supply
* Three Drivers and Five Receivers
* Operates Up To 235 kbps
* Designed to Transmit at a Data Rate of 235 kbps
* Low Standby Current (1uA Typical)
* External Capacitors (4*0.1µF)
* Accepts 5.0V Logic Input With 3.3V Supply
* Always-Active Non-inverting Receiver Output (R2OUTB)
* Serial-Mouse Drivability
* ESD(HBM) Protected ±8KV(MIN.)
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
UT3243L-P28-T
UT3243G-P28-T
UT3243L-P28-R
UT3243G-P28-R
UT3243L-R28-T
UT3243G-R28-T
UT3243L-R28-R
UT3243G-R28-R
Package Packing
TSSOP-28
TSSOP-28
SSOP-28
SSOP-28
Tube
Tape Reel
Tube
Tape Reel
UT3243L-P28-R
(1)Packing Type
(2)Package Type
(3)Lead Free
(1) R: Tape Reel
(2) P28: TSSOP-28, R28: SSOP-28
(3) L: Lead Free, G: Halogen Free
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., Ltd
1 of 9
QW-R502-573.F
http://www.Datasheet4U.com
1 page  
UT3243
CMOS IC
ELECTRICAL CHARACTERISTICS(Cont.)
(VCC = +3.0V~+5.5V, C1~C4=0.1µF (Note 2), TA = TMIN to TMAX, Unless Otherwise Specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
Receiver Positive or
Negative Threshold to
INVALID
High t
Low t
INVH
INVL
Fig.2
1
30
µs
µs
RECEIVER INPUTS
Input Voltage Range
Input Threshold Low
Input Threshold High
Input Hysteresis
Input Resistance
VRR
VRINL
TA = 25°C
VRINH TA = 25°C
VRINHYS
VRINRES TA = 25°C
-25 25 V
VCC=3.3V 0.6
VCC=5.0V 0.8
1.2
1.5
V
VCC=3.3V
VCC=5.0V
1.5 2.4
1.8 2.4
V
0.3 V
3 5 7 kΩ
TRANSMITTER OUTPUTS
Output Voltage Swing
VTOUTSW
All transmitter outputs loaded with
3kΩ to ground
±4.8 ±5.4
V
Output Resistance
VTOUTRES
VCC = V+ = V- = 0V,
Transmitter output = ±2V
300 10M
Ω
Output Short-Circuit Current
Output Leakage Current
ITSC
ITOUT(LK) VOUT=±12V, Transmitters disabled
±35 ±60 mA
±25 µA
MOUSE DRIVABILITY
Transmitter Output Voltage
VTOUT
T1IN = T2IN = GND, T3IN = VCC,
T3OUT loaded with 3kΩ to GND,
T1OUT and T2OUT loaded with 2.5mA each
±4.8
V
TIMING CHARACTERISTICS
Maximum Data Rate
DR
RL = 3kΩ, CL = 1000pF,
one transmitter switching
120 235
kbps
Receiver Propagation Delay
Receiver Output Time
Transmitter Skew
Receiver Skew
Enable t
Disable t
Transition-Region Slew Rate
tPHL
tPLH
R(EN)
R(DIS)
tTS |t
tRS
SR
Receiver input to receiver output,
CL = 150pF
Normal operation
PHL – tPLH|
|tPHL – tPLH|
VCC=3.3V, TA=25°C,
RL = 3kΩ ~ 7kΩ,
CL
=
200pF~2500pF
measured from +3V
~ -3V or -3V ~ +3V
CL = 200pF~1000pF
0.3
0.3
200
200
200
100
1000
500
µs
ns
ns
ns
ns
4 8.0 30
V/µs
6 30
Notes: 1. Typical values are at TA = 25°C.
2. C1~C4 = 0.1µF, measured at 3.3V ±10%. C1 = 0.047µF, C2~C4 = 0.33µF, measured at 5.0V ±10%.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 9
QW-R502-573.F
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet UT3243.PDF ] | |
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