AD ADM5170 Octal, rs-232/rs-423 line driver Datasheet

a
Octal, RS-232/RS-423 Line Driver
ADM5170
FEATURES
Eight Single Ended Line Drivers in One Package
Meets EIA Standard RS-232E, RS-423A and
CCITT V.10/X.26
Resistor Programmable Slew Rate
Wide Supply Voltage Range
Low Power CMOS
3-State Outputs
TTL/CMOS Compatible Inputs
Output Short Circuit Protection
Available in 28-Pin DIP/PLCC
Low Power Replacement for UC5170C
FUNCTIONAL BLOCK DIAGRAM
ADM5170
APPLICATIONS
High Speed Communication
Computer I-O Ports Peripherals
High Speed Modems
Printers
Logic Level Translation
GENERAL DESCRIPTION
The ADM5170 is an octal line driver suitable for digital communication systems with data rates up to 116 kB/s. Input TTL or
CMOS signal levels are inverted and translated into either EIA
RS-232E or RS-423A signal levels depending on the status of the
Mode Select inputs MS+ and MS–. With both Mode Select inputs
at GND, RS-423 operation is selected while with MS+ connected
to VDD and MS– connected to V SS, RS-232 operation is selected.
AI
A
AO
BI
B
BO
CI
C
CO
DI
D
DO
EI
E
EO
FI
F
FO
GI
G
GO
HI
H
HO
EN
MS+
MS–
The output slew rates may be controlled using an external resistor
connected between the SRA (Slew Rate Adjust) pin and GND.
Resistor values between 2 kΩ and 10 kΩ may be selected giving a
slew rate which can be adjusted from 10 V/µs to 2.2 V/µs. This
adjustment of the slew rate allows tailoring of the output characteristics to suit the interface cable being used.
SRA
RS-232/RS-423
MODE SELECT
SLEW RATE
CONTROL
Truth Table
The outputs may be disabled using the EN (Enable Input). This
feature permits sharing of a common output line.
Inputs
EN
Data
Outputs
EIA RS-232E1
RS-423A
The ADM5170 is fabricated on an advanced CMOS process
featuring low power consumption. In the disabled state the power
consumption reduces from 500 mW to 40 mW. The ADM5170 is
available in both 28-pin DIP and 28-lead PLCC packages.
0
0
1
0
1
X
(VDD – 3 V)
(VSS – 3 V)
High Z
5 V to 6 V
–5 V to –6 V
High Z
1
Minimum Output Level
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
V ± 10%, V = –10 V ± 10% V, MS+ = MS– = 0 V, R
ADM5170–SPECIFICATIONS (10V kΩ.= +10
All Specifications T to T unless otherwise noted.)
DD
SS
MIN
Parameter
POWER REQUIREMENTS
VDD Range
VSS Range
IDD (Disabled)
IDD (Enabled)
ISS (Disabled)
ISS (Enabled)
DIGITAL INPUTS
Input Logic Threshold High, V INH
Input Logic Threshold Low, V INL
Input Clamp Voltage, V INK
Input High Level Current, I INH
Input Low Level Current, I INL
OUTPUTS
RS-423A Outputs
High Level Output Voltage
Low Level Output Voltage
Output Balance, VBAL
RS-232 Outputs
High Level Output Voltage
Low Level Output Voltage
Off-State Output Current, I OZ
Short Circuit Current, IOS
Min
Typ
Max
Units
Test Conditions/Comments
2
25
–2
–23
15
–15
4
36
–4
–36
V
V
mA
mA
mA
mA
EN = High,
RL = ∞, EN = 0 V
EN = High
RL = ∞, EN = 0 V
–1.1
0.8
–1.8
1
V
V
V
µA
µA
IIN = –15 mA
VINH = 2.4 V
VINL = 0.4 V
5.0
5.0
4.5
–5.0
–5.0
–4.5
5.3
5.3
5.2
–5.3
–5.6
–5.4
0.05
6.0
6.0
6.0
–6.0
–6.0
–6.0
0.4
V
V
V
V
V
V
V
7.0
7.0
–7.0
–7.0
–100
15
15
7.6
7.6
–7.7
–7.7
VDD
VDD
VSS
VSS
100
100
100
V
V
V
V
µA
mA
mA
9
–9
2.0
–1
50
40
SRA
=
MAX
EN = 0.8 V, MS+ = MS– = 0 V
RL = ∞, VIN = 0.8 V
RL = 3 kΩ, VIN = 0.8 V
RL = 450 Ω, VIN = 0.8 V
RL = ∞, VIN = 2.0 V
RL = 3 kΩ, VIN = 2.0 V
RL = 450 Ω, VIN = 2.0 V
RL = 450 Ω, VBAL = VOH– VOL
EN = 0.8 V, MS+ = VDD, MS– = VSS
RL = ∞, VIN = 0.8 V
RL = 3 kΩ, VIN = 0.8 V
RL = ∞, VIN = 2.0 V
RL = 3 kΩ, VIN = 2.0 V
EN = 2.0 V, VO = ± 6 V, VDD= 15 V, VSS = –15 V
VIN = 0 V, EN = 0 V
VIN = 5 V, EN = 0 V
Specifications subject to change without notice.
( VDD = +10 V ± 10%, VSS = –10 V ± 10%, MS+ = MS– = 0 V. All Specifications TMIN to TMAX
TIMING CHARACTERISTICS unless otherwise noted.)
Parameter
Min
Typ
Max
Units
6.65
10
14
V/µs
1.33
2.0
3
V/µs
0.3
0.5
1.0
1.0
µs
µs
6.0
7.0
15
15
µs
µs
Output Slew Rate
Output Slew Rate
Output to Hi-Z Propagation Delay (Disable)
Hi-Z to Valid Output Propagation Delay (Enable)
Test Conditions/Comments
Fig 1, Fig 2. RSRA = 2 kΩ, RL = 450 Ω, CL = 50 pF
Rising/Falling Edge, tR, tF
Fig 1, Fig 2. RSRA = 10 kΩ, RL = 450 Ω, CL = 50 pF
Rising/Falling Edge, t R , tF
Fig 1, Fig 3. RSRA = 10 kΩ, RL = 450 Ω, CL = 50 pF
tHZ
tLZ
Fig 1, Fig 3. RSRA = 10 kΩ, RL = 450Ω, CL = 50 pF
tZH
tZL
Specifications subject to change without notice.
–2–
REV. 0
ADM5170
ABSOLUTE MAXIMUM RATINGS*
ORDERING GUIDE
(TA= 25°C unless otherwise noted)
VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +15 V
VSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –15 V
Input Voltages
VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 to (VDD + 0.3 V)
Ouput Voltages
VOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –12 V to +12 V
Output Short Circuit Duration . . . . . . . . . . . . . . . . . . Continuous
Power Dissipation Plastic DIP . . . . . . . . . . . . . . . . . . . . 1250 mW
(Derate at 12.5 mW/°C above +50°C)
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . . . 75°C/W
Power Dissipation PLCC . . . . . . . . . . . . . . . . . . . . . . . 1000 mW
(Derate at 10 mW/°C above +50°C)
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . . . 80°C/W
Operating Temperature Range
Commercial (J Version) . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
Industrial (A Version) . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
Lead Temperature (Soldering 10 sec) . . . . . . . . . . . . . . . . +300°C
Vapour Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
Model
Temperature Range
Package Option
ADM5170JN
ADM5170AN
ADM5170JP
ADM5170AP
0°C to +70°C
–40°C to +85°C
0°C to +70°C
–40°C to +85°C
N-28
N-28
P-28A
P-28A
*This is a stress rating only and functional operation of the device at these or any
other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended
periods of time may affect reliability.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the ADM5170 features proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
VIN
INPUT
EN
EN
RL
1.5V
1.5V
CL
0.5V
MS+
RS-232/RS-423
MODE SELECT
VOH
90%
OUTPUT
VIN = 0V
MS–
SRA
SLEW RATE
CONTROL
tHZ
0.5V
OUTPUT
VIN = 5V
Figure 1. Timing Test Circuit
tZH
90%
VOL
tLZ
tZL
VIN
tF
Figure 3. Enable/Disable Timing Waveforms
tR
90%
10%
VOUT
90%
10%
Figure 2. Rise/Fall Timing Waveforms
REV. 0
–3–
ADM5170
PIN CONFIGURATIONS
Slew Rate Programming
The slew rate for the ADM5170 is controlled by a single resistor
connected between the SRA pin and GND. The slew rate is
approximately.
DIP
NC
1
28 HO
AO
2
27 HI
AI
3
26
BI
4
25 GO
BO
5
24 FO
CO
6
23 FI
CI
7
DI
8
Slew Rate (V/µs) = 20/RSRA (kΩ)
Resistors between 2 kΩ and 10 kΩ may be used providing a slew
rate which may be varied from 10 V/µs to 2.2 V/µs. Figure 5 in the
Typical Performance Characteristics section shows how the slew
rate varies with R SRA while Figure 8 shows how the transition time
(10% to 90%) varies with R SRA. Waveshaping of the output allows
the user to control the level of interference (near-end crosstalk)
which may be coupled to adjacent circuits in an interconnection.
The recommended output characteristics for cable length and data
rate are given in the EIA RS-423A specifications.
GI
ADM5170
22 EI
TOP VIEW
(Not to Scale) 21 EO
DO
9
20 VDD
EN
10
19 MS+
VSS
11
18 GND
SRA
12
17
Maximum Data Rate (kB/s) = 300/t (for rates from 1 kB/s to
100 kB/s).
MS–
NC
13
16 NC
NC
14
15 NC
Cable Length (feet) = 100 X t (Max Length = 4000 ft.)
where t is the transition time (in µs) for the output to swing from
10% to 90% of its steady state values. The absolute maximum data
rate is 100 kB/s and the maximum cable length is limited to 4000 ft.
NC = NO CONNECT
1
28 27 26
HI
2
Output Mode Programming
The ADM5170 has two programmable output modes which
provide different output voltage levels. The low output mode meets
the specifications of EIA standards RS-423A while the high output
mode meets the RS-232 specifications. The high output mode
provides greater output swings and is suitable for driving lines
where higher attenuation levels must be tolerated. This mode is
selected by connecting the mode select pins to the supplies, MS+ to
VDD and MS– to VSS. The low output mode is selected by connecting both mode select pins MS+ and MS– to GND. This mode
provides a controlled output swing with lower output levels.
GI
HO
3
AO
AI
4
NC
BI
PLCC
BO
5
25 GO
CO
6
24 FO
CI
7
ADM5170
23 FI
DI
8
22 EI
DO
9
TOP VIEW
(Not to Scale)
21 EO
EN 10
20 VDD
VSS 11
19 MS+
Inputs
GND
NC
MS–
NC
NC
NC
SRA
12 13 14 15 16 17 18
Outputs
MS+
MS–
EN
Data
Output
GND
GND
VDD
VDD
X
GND
GND
VSS
VSS
X
0
0
0
0
1
0
1
0
1
X
5 V to 6 V (RS-423)
–5 V to –6 V (RS-423)
(VDD – 3 V) (RS-232)1
(VSS + 3 V) (RS-232)1
High Z
NC = NO CONNECT
PIN FUNCTION DESCRIPTION
Mnemonic
Function
VDD
VSS
GND
AI . . . H I
AO . . . H O
EN
MS+, MS–
Power Supply Input, +10 V ± 10%.
Power Supply Input, –10 V ± 10%.
Ground Pin. Must be connected to 0 V.
Digital Input to Drivers A to H.
RS-232/RS-423 Output from Drivers A to H.
Enable Pin. When high, all outputs are 3-stated.
Mode Select Inputs. Used to control the output
level swing. With MS+ & MS– connected to GND,
RS-423A output levels are selected. With MS+
connected to VDD and MS– connected to V SS,
RS-232 output levels are developed.
Slew Rate Adjust Input. An external resistor (2 kΩ
to 10 kΩ) connected between this pin and GND is
used to control the Output Slew Rate (10 V/µs to
2.2 V/µs).
SRA
1
Minimum Output Level.
Typical Application Circuit
A typical application circuit using a single driver in the ADM5170
is shown in Figure 4. This circuit is suitable for either RS-232 or
RS-423 communication. An ADM5180 octal receiver is used to
translate the signal back to CMOS logic level at the receiving end.
VH
VDD
VL
INPUT
1/8
ADM5170
+V
–V
RS-232/RS-422A
TRANSMISSION
VH
VL
1/8
ADM5180
EN
RSL
VSS
TIE TO GND
FOR RS-232
Figure 4. RS-232/RS-423A Typical Application Circuit
–4–
REV. 0
Typical Performance Characteristics–ADM5170
5
12
10
4
TRANSITION TIME – µs
SLEW RATE – V/µs
tr
8
6
tf
4
tf
3
tr
2
1
2
0
0
2
4
6
8
0
10
0
ΩRSRA – kΩ
Figure 5. Typical Slew Rate vs. RSRA
A1
2
20V
A1
100
90
90
10
10
0%
0%
1µs
5V
6
ΩRSRA – kΩ
10
8
Figure 8. Typical Rise/Fall Times (RS-423A Mode) vs.
RSRA
100
5V
4
5V
Figure 6. Slew Rate (RSRA = 2 kΩ)
20V
1 µs
5V
Figure 9. Slew Rate (RSRA = 10 kΩ)
15
5.6
DRIVER OUTPUT VOLTAGE – V
DRIVER OUTPUT VOLTAGE – V
14
VOH/VOL (RL= ∞)
13
12
11
ΩVOL (RL= 3kΩ)
10
ΩVOH (RL= 3kΩ)
9
5.5
∞VOL (RL= ∞)
∞VOH (RL= ∞)
5.4
VOL (RL= 450Ω)
5.3
ΩVOH (RL= 450Ω)
5.2
8
7
9
10
11
12
13
14
5.1
15
9
VDD/VSS – V
11
12
13
VDD/ VSS – V
14
Figure 10. VOH/VOL vs. VDD/VSS (RS-423 Mode)
Figure 7. VOH/VOL vs. VDD/VSS (RS-232 Mode)
REV. 0
10
–5–
15
ADM5170
6
10
 VOL
VOL
6
4
2
5
VOH
4
C1853–7.5–10/93
8
DRIVER OUTPUT VOLTAGE –  V
DRIVER OUTPUT VOLTAGE –  V
VOH
3
2
1
0
0
0
5
10
15
OUTPUT CURRENT – ˙mA
20
0
25
5
10
15
20
25
OUTPUT CURRENT – ˙mA
Figure 11. Driver Output Voltage vs. Output Current
(RS-232 Mode)
Figure 12. Driver Output Voltage vs. Output Current
(RS-423 Mode)
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
28-Lead Plastic DIP
(N Suffix)
28-Lead Plastic Leaded Chip Carrier (PLCC)
(P Suffix)
15
28
0.048 (1.21)
0.042 (1.07)
0.580 (14.73)
0.485 (12.32)
PIN
1
1
14
1.565 (39.70)
1.380 (35.10)
0.180 (4.57)
0.165 (4.19)
0.025 (0.63)
0.015 (0.38)
26
5
4
0.050
(1.27)
BSC
0.060 (1.52)
0.015 (0.38)
0.250
(6.35)
MAX
PIN 1
IDENTIFIER
25
0.021 (0.53)
0.013 (0.33)
0.430 (10.92)
0.390 (9.91)
TOP VIEW
0.150
(3.81)
MIN
0.200 (5.05)
0.125 (3.18)
0.100
(2.54)
BSC
0.070 (1.77)
MAX
0.032 (0.81)
0.026 (0.66)
19
11
SEATING
PLANE
0.020
(0.50)
R
0.625 (15.87)
0.600 (15.24)
12
18
0.495 (12.57)
0.485 (12.32) SQ
0.195 (4.95)
0.125 (3.18)
0.040 (1.01)
0.025 (0.64)
0.456 (11.58)
0.450 (11.43)SQ
0.110 (2.79)
0.085 (2.16)
0.015 (0.381)
0.008 (0.204)
PRINTED IN U.S.A.
0.022 (0.558)
0.014 (0.356)
0.048 (1.21)
0.042 (1.07)
0.056 (1.42)
0.042 (1.07)
–6–
REV. 0
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