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PDF ST75285 Data sheet ( Hoja de datos )
| Número de pieza | ST75285 | |
| Descripción | MULTIPLE RS-232 DRIVERS AND RECEIVERS | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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ST75285
MULTIPLE RS-232 DRIVERS AND RECEIVERS
s MEETS AND EXCEEDS THE
REQUIREMENTS OF EIA/TIA-232-E AND
ITUV.28 STANDARD
s SINGLE CHIP WITH EASY INTERFACE
BETWEEN UART AND SERIAL PORT
CONNECTOR OF IBM PC/ATTM AND
COMPATIBLES
s DESIGNED TO SUPPORT DATA RATES UP
TO 120 Kbps
DESCRIPTION
The ST75285 contains six drivers and ten
receivers. The pinout matches the DB9S
connector design in order to decrease the part
count, reduce the board space required and allow
easy interconnection of the UART and serial port
connector of IBM PC/ATTM and compatibles. The
bipolar circuits and processing of the ST75285
provides a rugged low-cost solution for this
function at the expense of quiescent power and
external passive components relative to the
ST75C185.
The ST75285 complies with the requirements of
the EIA/TIA 232-E and ITU (formally CCITT) v.28
standards. These standards are for data
interchange between a host computer and
TSSOP
peripheral at signalling rates up to 20k-bits/s. The
switching speeds of the ST75285 are fast enough
to support rates up to 120K-bits/s with lower
capacitive loads (shorter cables). Interoperability
at the higher signalling rates cannot be assured
unless the designer has design control of the
cable and the interface circuits at the both ends.
For interoperability at signalling rates to 120
K-bits/s, use of EIA/ITA-423-B (ITU v.10) and EIA/
ITA-422-B (ITU v.11) standards are
recommended. It allows space saving in
applications where two ST75185 are needed.
ORDERING CODES
Type
ST75285CTR
Temperature
Range
0 to 70 °C
Package
TSSOP38 (Tape & Reel)
Comments
2500 parts per reel
December 2002
1/13
1 page  
ST75285
DRIVER SWITCHING CHARACTERISTICS (VDD = 12V, VSS = -12V, VCC = 5V, TA = 25 °C)
Symbol
Parameter
Test Conditions
Min.
Value
Typ.
Max.
tPLH Propagation Delay Time, Low to High RL = 3 to 7 KΩ CL = 15 pF
Level Output
(See Figure 3, 4)
tPHL Propagation Delay Time, High to Low RL = 3 to 7 KΩ CL = 15 pF
Level Output
(See Figure 3, 4)
tTLH Transition Time Low to High Level
Output
RL = 3 to 7 KΩ CL = 15 pF
(See Figure 3, 4)
RL = 3 to 7 KΩ CL = 2500 pF
(Note 6, See Figure 3, 4)
tTHL Transition Time High to Low Level
Output
RL = 3 to 7 KΩ CL = 15 pF
(See Figure 3, 4)
RL = 3 to 7 KΩ CL = 2500 pF
(Note 6, See Figure 3, 4)
200 400
50 100
60 100
1.7 2.5
50 100
1.5 2.5
NOTE 6: Measured between -3V and 3V points of output waveform (EIA-232-E conditions), all unused inputs are tied.
Unit
ns
ns
ns
µs
ns
µs
RECEIVER ELECTRICAL CHARACTERISTICS OVER OPERATING CONDITIONS
Symbol
Parameter
Test Conditions
VT+
VT-
Vhys
VOH
Positive Going Threshold Voltage
Negative Going Threshold Voltage
Input Hysteresis (VT+ - VT-)
High Level Output Voltage
VOL Low Level Output Voltage
IIH High Level Input Current
IIL Low Level Input Current
IOS Short-Circuit Output Current
(See Figure 6)
TA = 25 °C (See Figure 6)
IOH = -0.5mA VIH = 0.75 V
Inputs Open
VI = 3 V IOL = 10 mA
VI = 25 V (See Figure 6)
VI = 3 V (See Figure 6)
VI = -25 V (See Figure 6)
VI = -3 V (See Figure 6)
VI = 0 V VO = 0 V
(See Figure 5)
All typical values are at TA = 25°C, VCC = 5V, VDD = 9V and VSS=-9V
Min.
0.75
0.5
2.6
2.6
3.6
0.43
-3.6
-0.43
Value
Typ.
2.2
0.97
4
0.2
-3.4
Max.
2.4
5
0.45
8.3
-8.3
-12
Unit
V
V
V
V
V
mA
mA
mA
RECEIVER SWITCHING CHARACTERISTICS (VDD = 12V, VSS = -12V, VCC = 5V TA = 25°C)
Symbol
Parameter
Test Conditions
tPLH Propagation Delay Time Low to High RL = 5 KΩ CL = 50 pF
Level Output
(See Figure 6)
tPHL Propagation Delay Time High to Low RL = 5 KΩ CL = 50 pF
Level Output
(See Figure 6)
tTLH Transition Time Low to High Level
Output
RL = 5 KΩ CL = 50 pF
(See Figure 6)
tTHL Transition Time High to Low Level
Output
RL = 5 KΩ CL = 50 pF
(See Figure 6)
Min.
Value
Typ.
200
Max.
500
Unit
ns
60 120 ns
200 525
ns
20 60 ns
5/13
5 Page 
DIM.
A
A1
A2
b
c
D
E
E1
e
K
L
MIN.
0.05
0.8
0.17
0.09
9.6
6.2
4.3
0˚
0.50
TSSOP38 MECHANICAL DATA
mm.
TYP
1
9.7
6.4
4.4
0.5
0.6
MAX.
1.2
0.15
1.05
0.27
0.20
9.8
6.6
4.5
8˚
0.75
MIN.
0.002
0.031
0.0067
0.0035
0.378
0.244
0.169
0˚
0.020
inch
TYP.
0.039
0.381
0.252
0.173
0.0197
0.023
ST75285
MAX.
0.047
0.006
0.041
0.011
0.0079
0.385
0.260
0.177
8˚
0.030
A A2
A1 b
e
D
K
c
L
E
E1
PIN 1 IDENTIFICATION
1
0117861/B
11/13
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ST75285.PDF ] | |
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