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Электронный компонент: 145406

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Philips Semiconductors Linear Products
Product specification
MC145406
EIA-232-D/V.28 driver/receiver
467
August 31, 1994
853-1430 13721
DESCRIPTION
The MC145406 is a silicon-gate CMOS IC that combines 3 drivers
and 3 receivers to fulfill the electrical specifications of standards
EIA-232-D and CCITT V.28. The drivers feature true TTL input
compatibility, slew-rate limited output, 300
power-off source
impedance, and output typically switching to within 25% of the
supply rails. The receivers can handle up to +25V while presenting
3 to 7k
impedance. Hysteresis in the receiver aids reception of
noisy signals. By combining both drivers and receivers in a single
CMOS chip, the MC145406 provides efficient, low-power solutions
for EIA-232-D and V.28 applications.
APPLICATIONS
Modem interface
Voice/data telephone interface
Lap-top computers
UART interface
FEATURES
Drivers
+5 to +12V supply range
300
power-off source impedance
Output current limiting
TTL compatible
PIN CONFIGURATION
VDD
RX1
VCC
DO1
DI1
DO2
DI2
DO3
GND
D
and N Packages
1
2
3
4
5
6
7
8
9
10
11
12
13
14
16
15
TX1
VSS
RX2
TX2
RX3
TX3
DI3
NOTE:
D = Driver
R = Receiver
R
D
R
D
R
D
Maximum slew rate = 30V/
s
Receivers
+25V input voltage range over the full supply range
3 to 7k
input impedance
Hysteresis on input switchpoint
General
Very low supply currents for long battery life
Operation is independent of power supply sequencing
ORDERING INFORMATION
DESCRIPTION
TEMPERATURE RANGE
ORDER CODE
DWG #
16-Pin Plastic Dual In-Line (DIP) Package
0 to +70
C
MC145406N
0406C
16-Pin Small Outline Large (SOL) Package
0 to +70
C
MC145406D
0171B
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
RATING
UNITS
V
CC
Supply voltage
-0.5 to +6.0
V
V
DD
Supply voltage
-0.5 to +13.5
V
V
SS
Supply voltage
+0.5 to -13.5
V
V
IR
Input voltage range
RX
1-3
inputs
DI
1-3
inputs
(V
SS
- 15) to (V
DD
+ 15)
-0.5 to (V
CC
+ 0.5)
V
DC current per pin
+100
mA
P
D
Power dissipation (package)
1.0
W
T
A
Operating temperature range
0 to +70
C
T
STG
Storage temperature range
-65 to +150
C
JA
Thermal impedance N package
D package
80
105
C/W
NOTE: This device contains protection circuitry to protect the inputs against damage due to high static voltages or electric fields; however, it is
advised that normal precautions be taken to avoid application of any voltage higher than maximum rated voltages to this high impedance circuit.
For proper operation, it is recommended that the voltages at the DI and DO pins be constrained to the range GND < V
DI
< V
DD
and GND < V
DO
< V
CC
. Also, the voltage at the RX pin should be constrained to +25V, and TX should be constrained to V
SS
< V
TX1-3
< V
DD
. Unused inputs
must always be tied to an appropriate logic voltage level (e.g., GND or V
CC
for DI, and V
SS
or V
DD
for RX).
Philips Semiconductors Linear Products
Product specification
MC145406
EIA-232-D/V.28 driver/receiver
August 31, 1994
468
BLOCK DIAGRAM
RECEIVER
DO
DI
1.4V
LEVEL
SHIFT
DRIVER
HYSTERESIS
300
15k
5.4k
RX
TX
VCC
VSS
VCC
VDD
VSS
VCC
1.0V
1.8V
+
+
PIN #
SYMBOL
PIN DESCRIPTION
1
V
DD
Positive power supply. The most positive power supply pin, which is typically 5 to 12 volts.
8
V
SS
Negative power supply. The most negative power supply pin, which is typically -5 to -12 volts.
16
V
CC
Digital power supply. The digital supply pin, which is connected to the logic power supply (maximum +5.5V).
9
GND
Ground. Ground return pin is typically connected to the signal ground pin of the EIA-232-D connector (Pin 7)
as well as to the logic power supply ground.
2, 4, 6
RX
1
, RX
2
, RX
3
Receive Data Input. These are the EIA-232-D receive signal inputs whose voltages can range from +25 to
-25V. A voltage between +3 and +25 is decoded as a space and causes the corresponding DO pin to swing
to ground (0V); a voltage between -3 and -25V is decoded as a mark and causes the DO pin to swing up to V
CC
.
The actual turn-on input switchpoint is typically biased at 1.8V above ground, and includes 800mV of hysteresis
for noise rejection. The nominal input impedance is 5k
. An open or grounded input pin is interpreted as a mark,
forcing the DO pin to V
CC
.
11, 13, 15
DO1, DO2, DO3
Data Output. These are the receiver digital output pins, which swing from V
CC
to GND. A space on the RX
pin causes DO to produce a logic zero; a mark produces a logic one. Each output pin is capable of driving one
LSTTL input load.
10, 12, 14
DI1, DI2, DI3
Data Input. These are the high-impedance digital input pins to the drivers. TTL compatibility is accomplished
by biasing the input switchpoint at 1.4V above ground. However, 5V CMOS compatibility is maintained as well.
Input voltage levels on these pins must be between V
CC
and GND.
3, 5, 7
TX1, TX2, TX3
Transmit Data Output. These are the EIA-232-D transmit signal output pins, which swing toward V
DD
and V
SS
.
A logic one at a DI input causes the corresponding TX output to swing toward V
SS
. A logic zero causes the
output to swing toward V
DD
(the output voltages will be slightly less than V
DD
or V
SS
depending upon the output
load). Output slew rates are limited to a maximum of 30V/
s. When the MC145406 is off (V
DD
= V
SS
= V
CC
= GND), the minimum output impedance is 300
.
Philips Semiconductors Linear Products
Product specification
MC145406
EIA-232-D/V.28 driver/receiver
August 31, 1994
469
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
RATING
UNITS
V
CC
Supply voltage
-0.5 to +6.0
V
V
DD
Supply voltage
-0.5 to +13.5
V
V
SS
Supply voltage
+0.5 to -13.5
V
V
IR
Input voltage range
RX
1-3
inputs
DI
1-3
inputs
(V
SS
- 15) to (V
DD
+ 15)
-0.5 to (V
CC
+ 0.5)
V
DC current per pin
+100
mA
P
D
Power dissipation (package)
1.0
W
T
A
Operating temperature range
0 to +70
C
T
STG
Storage temperature range
-65 to +150
C
JA
Thermal impedance N package
D package
80
105
C/W
NOTE: This device contains protection circuitry to protect the inputs against damage due to high static voltages or electric fields; however, it is
advised that normal precautions be taken to avoid application of any voltage higher than maximum rated voltages to this high impedance circuit.
For proper operation, it is recommended that the voltages at the DI and DO pins be constrained to the range GND < V
DI
< V
DD
and GND < V
DO
< V
CC
. Also, the voltage at the RX pin should be constrained to +25V, and TX should be constrained to V
SS
< V
TX1-3
< V
DD
. Unused inputs
must always be tied to an appropriate logic voltage level (e.g., GND or V
CC
for DI, and V
SS
or V
DD
for RX).
DC ELECTRICAL CHARACTERISTICS
Typical values are at T
A
= 0 to 70
C; GND = 0V, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
LIMITS
UNITS
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
DC supply voltage
V
DD
4.5
5 to 12
13.2
V
V
SS
-4.5
-5 to -12
-13.2
V
V
CC
4.5
5.0
5.5
V
Quiescent supply current (outputs unloaded, inputs low)
I
DD
V
DD
= +12V
20
400
A
I
SS
V
SS
= -12V
280
600
A
I
CC
V
CC
= +5V
260
450
A
RECEIVER ELECTRICAL CHARACTERISTICS
Typical values are at T
A
= 0 to 70
C; GND = 0V; V
DD
= +5 to +12V; V
SS
= -5 to -12V; V
CC
= +5V +5%, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
LIMITS
UNITS
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
V
ON
Input turn-on threshold
RX
1-3
V
DO1-3
= V
OL
, V
CC
= 5.0V +5%
1.35
1.80
2.35
V
V
OFF
Input turn-off threshold
RX
1-3
V
DO1-3
= V
OH
, V
CC
= 5.0V +5%
0.75
1.00
1.25
V
V
ON
-V
OFF
Input threshold hysteresis
RX
1-3
V
CC
= 5.0V +5%
0.6
0.8
V
R
IN
Input resistance
RX
1-3
(V
SS
-15V) < V
RX1-3
< (V
DD
+15V)
3.0
5.0
7.0
k
V
OH
High level output voltage
DO
1-3
I
OH
= -20
A, V
CC
= +5.0V
4.9
5.0
V
V
RX1-3
= -3V to (V
SS
-15V)
1
I
OH
= -1mA, V
CC
= +5.0V
3.8
4.4
V
V
OL
Low level output voltage
DO
1-3
V
RX1-3
= +3V to (V
DD
+15V)
1
I
OL
= +20
A, V
CC
= +5.0V
0.005
0.1
V
V
OL
Low level output voltage
DO
1-3
V
RX1-3
= +3V to (V
DD
+15V)
1
I
OL
= +2mA, V
CC
= +5.0V
0.15
0.5
V
V
RX1-3
= +3V to (V
DD
+15V)
1
I
OL
= +4mA, V
CC
= +5.0V
0.3
0.7
NOTE:
1. This is the range of input voltages as specified by EIA-232-D to cause a receiver to be in the high or low logic state.
Philips Semiconductors Linear Products
Product specification
MC145406
EIA-232-D/V.28 driver/receiver
August 31, 1994
470
DRIVER ELECTRICAL CHARACTERISTICS
Typical values are at T
A
= 0 to 70
C; GND = 0V; V
CC
= +5V +5%, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
LIMITS
UNITS
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
V
IL
Digital input voltage
DI
1-3
Logic 0
0.8
V
V
IH
Digital input voltage
DI
1-3
Logic 1
2.0
V
I
IN
Input current
DI
1-3
V
DI1-3
= V
CC
+1.0
A
V
OH
Output high voltage
TX
1-3
V
DI1-3
= Logic 0, R
L
= 3.0k
V
DD
= +5.0V, V
SS
= -5.0V
3.5
4.1
V
V
OH
Output high voltage
TX
1-3
V
DI1-3
= Logic 0, R
L
= 3.0k
V
DD
= +6.0V, V
SS
= -6.0V
4.3
5.0
V
V
DI1-3
= Logic 0, R
L
= 3.0k
V
DD
= +12.0V, V
SS
= -12.0V
9.2
10.4
V
OL
Output low voltage
1
TX
1-3
V
DI1-3
= Logic 0, R
L
= 3.0k
V
DD
= +5.0V, V
SS
= -5.0V
-4.0
-4.3
V
V
OL
Output low voltage
1
TX
1-3
V
DI1-3
= Logic 0, R
L
= 3.0k
V
DD
= +6.0V, V
SS
= -6.0V
-4.5
-5.2
V
V
DI1-3
= Logic 0, R
L
= 3.0k
V
DD
= +12.0V, V
SS
= -12.0V
-10.0
-10.3
Off source resistance
TX
1-3
Figure 1
V
DD
=V
SS
=GND=0V, V
TX1-3
= +2.0V
300
I
SC
Output short-circuit current
TX
1-3
TX
1-3
shorted to GND
2
+22
+
60
mA
V
DD
= +12.0V, V
SS
= -12.0V
TX
1-3
shorted to +15.0V
3
+60
+100
mA
NOTE:
1. The voltage specifications are in terms of absolute values.
2. Specification is for one TX output pin to be shorted at a time. Should all three driver outputs be shorted simultaneously, device power dis-
sipation limits will be exceeded.
3. This condition could exceed package limitations.
SWITCHING CHARACTERISTICS
Typical values are at T
A
= 0 to 70
C; V
CC
= +5V +5%, unless otherwise specified. (See Figures 2 and 3)
SYMBOL
PARAMETER
TEST CONDITIONS
LIMITS
UNITS
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Drivers
t
PLH
Propagation delay time
TX
1-3
Low-to-High R
L
= 3k
, C
L
= 50pF
300
500
ns
t
PHL
Propagation delay time
TX
1-3
High-to-Low R
L
= 3k
, C
L
= 50pF
300
500
ns
SR
Output slew rate
TX
1-3
(minimum load)
R
L
= 7k
, C
L
= 0pF,
V
DD
= 6 to 12.0V, V
SS
= -6 to -12V
+6
+30
V/
s
SR
Output slew rate
TX
1-3
(maximum load)
R
L
= 3k
, C
L
= 2500pF,
V
DD
= 12V, V
SS
= -12V
+3.0
V/
s
Receivers (C
L
= 50pF)
t
PLH
Propagation delay time
DO
1-3
Low-to-High
150
425
ns
t
PHL
Propagation delay time
DO
1-3
High-to-Low
150
425
ns
t
R
Output rise time
DO
1-3
120
400
ns
t
F
Output fall time
DO
1-3
40
100
ns
Philips Semiconductors Linear Products
Product specification
MC145406
EIA-232-D/V.28 driver/receiver
August 31, 1994
471
VDD
VCC
1
14
12
10
8
9
7
5
3
16
VSS
DI1
DI2
DI3
TX1
TX2
TX3
VIN
= +2V
ROUT
I
=
VIN
Figure 1. Power-Off Source Resistance (Drivers)
DRIVERS
RECEIVERS
3V
0V
+3V
0V
50%
90%
10%
50%
90%
50%
10%
DI1-3
TX1-3
VOH
VOL
tPLH
tPHL
tF
tF
VOH
VOL
tF
tF
tPLH
tPHL
DO1-3
RX1-3
Figure 2. Switching Characteristics
DRIVERS
tSLH
TX1-3
3V
3V
3V
3V
tSHL
3V 3V
3V (3V)
OR
SLEW RATE (SR) =
tSLH
tSHL
Figure 3. Slew Rate Characteristics
APPLICATIONS INFORMATION
The MC145406 has been designed to meet the electrical
specifications of standards EIA-232-D/CCITT V.28 and as such,
defines the electrical and physical interface between Data
Communication Equipment (DCE) and Data Terminal Equipment
(DTE). A DCE is connected to a DTE using a cable that typically
carries up to 25 leads, which allow the transfer of timing, data,
control, and test signals. The MC145406 provides the necessary
level shifting between the TTL/CMOS logic levels and the high
voltage levels of EIA-232-D (ranging from +3 to +25V).
DRIVERS
As defined by the specification, an EIA-232-D driver presents a
voltage of between +5 to +15V into a load of between 3 to 7k
. A
logic one at the driver input results in a voltage of between -5 to
-15V. A logic zero results in a voltage between +5 to +15V. When
operating at +7 to +12V, the MC145406 meets this requirement.
When operating at +5V, the MC145406 drivers produce less than
+5V at the output (when terminated), which does not meet the
EIA-232-D specification. However, the output voltages when using
a +5V power supply are high enough (around +4V) to permit proper
reception by an EIA-232-D receiver, and can be used in applications
where strict compliance to EIA-232-D is not required.
Another requirement of the MC145406 drivers is that they withstand
a short to another driver in the EIA-232-D cable. The worst-case
condition that is permitted by EIA-232-D is a +15V source that is
current limited to 500mA. The MC145406 drivers can withstand this
condition momentarily. In most short circuit conditions the source
driver will have a series 300
output impedance needed to satisfy
the EIA-232-D driver requirements. This will reduce the short circuit
current to under 40mA which is an acceptable level for the
MC145406 to withstand.
Unlike some other drivers, the MC145406 drivers feature an
internally-limited output slew rate that does not exceed 30V/
s.
RECEIVERS
The job of an EIA-232-D receiver is to level-shift voltages in the
range of -25 to +25V down to TTL/CMOS logic levels (0 to +5V). A
voltage of between -3 and -25V on RX
1
is defined as a mark and
produces a logic one at DO
1
. A voltage between +3 and +25V is a
space and produces a logic zero. While receiving these signals, the
RX inputs must present a resistance between 3 and 7k
.
Nominally, the input resistance of the RX
1-3
inputs is 5.0k
.
The input threshold of the RX
1-3
inputs is typically biased at 1.8V
above ground (GND) with typically 800mV of hysteresis included to
improve noise immunity. The 1.8V bias forces the appropriate DO
pin to a logic one when its RX input is open or grounded as called
for in EIA-232-D specification. Notice that TTL logic levels can be
applied to the RX inputs in lieu of normal EIA-232-D signal levels.
This might be helpful in situations where access to the modem or
computer through the EIA-232-D connector is necessary with TTL
devices. However, it is important not to connect the EIA-232-D
outputs (TX
1
) to TTL inputs since TTL operates off +5V only, and
may be damaged by the high output voltage of the MC145406.
The DO outputs are to be connected to a TTL or CMOS input (such
as an input to a modem chip). These outputs will swing from V
CC
to
ground, allowing the designer to operate the DO and DI pins from
the digital power supply. The TX and RX sections are independently
powered by V
DD
and V
SS
so that one may run logic at +5V and the
EIA-232-D signals at +12V.