ADM1487JR [ADI]
Ultra-Low Power RS-485/RS-422 Transceiver with Low EMI and +/-10kV ESD Protection; 超低功耗RS - 485 / RS - 422收发器，具有低EMI和+/- 10kV ESD保护
| 型号： | ADM1487JR |
| 厂家： | 
ADI |
| 描述： | Ultra-Low Power RS-485/RS-422 Transceiver with Low EMI and +/-10kV ESD Protection |
| 文件： | 总8页 (文件大小：378K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PRELIMINARY TECHNICAL DATA
Ultra-LowPowerRS-485/RS-422Transceiver
a
with Low EMI and +/-10kV ESD Protection
ADM1487
Preliminary Technical Data
FEATURES
GENERAL DESCRIPTION
Low Power - 120µA Max ICC with Driver Disabled
The ADM1487 is an ultra-low power RS-485/RS-422
transceiver consisting of one driver and one receiver per
package. Quiescent operating current is typically 80µA
and 1µA in shutdown mode. The driver and receiver both
have three-state outputs. This allows multiple drivers to be
connected to an RS-485/RS-422 bus, or several receiver
outputs to be connected to a serial data bus. The driver
will maintain a high-impedance output state even with
power off, while the receiver features fail-safe operation
that guarantees a logic high output if the inputs are left
open-circuit.
High Input Impedance — Up to 256 Transceivers on Bus
Low-Current (1µA) Shutdown Mode
Slew Rate Control for Error-Free Data
Transmission and Low EMI
±10ꢀk ESD Protection (Human Bodꢁ Model) on
RS-485 I/O pins
Thermal Protection of Driver
Glitch-Free Driver Power-Up Allows Hot Connection
Driver Maintains High Output Impedance with Power
Off
The device has slew-rate limited drivers to minimize elec-
tromagnetic interference (EMI) and reduce reflections
caused by incorrectly terminated cables.
Wide Common-Mode Range Allows ±±k Ground Differ-
ences Between Devices
Pin-Compatible with Industrꢁ Standard ±51±6
APPLICATIONS
Batterꢁ-Powered RS-485/RS-422 Sꢁstems
Level Translation
FUNCTIONAL BLOCK DIAGRAM
RO
RE
DE
DI
V
1
2
3
4
8
7
6
5
CC
R
B
A
D
GND
ADM1487
REV. PrC 08/02
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 Technologꢁ Waꢁ, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: ±81/329-4±00
Fax: ±81/326-8±03
www.analog.com
Analog Devices, Inc., 2002
–1–
PRELIMINARY TECHNICAL DATA
ADM1487
ADM1487SPECIFICATIONS
DC ELECTRICAL CHARACTERISTICS (VCC = +5V 5ꢀ% ꢁA = 0°C ꢁO +70°C% UNLESS OꢁHERWISE NOꢁED)
Parameter
Min
Typ
Max
Units TestConditions/Comments
Differential Driver Output Voltage,VOD1
5
V
Unloaded, IO = 0
Differential Driver Output Voltage, VOD2 2.0
1.5
V
V
Figure 1, R = 50ꢀ (RS-422)
Figure 1, R = 27ꢀ (RS-485)
5
Change in Magnitude of Driver
Differential Output Voltage for
Complementary Output States, ꢁVOD
0.2
V
Figure 1, R = 27ꢀ or R = 50ꢀ
Driver Common-Mode Output
Voltage, VOC
3
V
V
Figure 1, R = 27ꢀ or R = 50ꢀ
R = 27ꢀ or R = 50ꢀ
Change in Magnitude of Driver
0.2
Common-Mode Output Voltage for
Complementary Output States, ꢁ|VOC
|
Input High Voltage (DE, DI, RE), VIH
Input Low Voltage (DE, DI, RE), VIL
Input Current (DE, DI, RE), IIN1
Input Current (A, B), IIN2
2
V
V
0.8
2
µA
0.30
-0.15
mA
mA
DE = 0, VCC= 0V or 5.25V, VIN = 12V
DE = 0, VCC = 0V or 5.25V, VIN = –7V
Differential Input Threshold Voltage
for Receiver, VTH
-0.2
3.5
0.2
V
–7V ꢂ VCM ꢂ 12V
Receiver Input Hysteresis, ꢁVTH
Receiver Output High Voltage, VOH
Receiver Output Low Voltage, VOL
45
96
mV
V
VCM = 0V
IO =-4mA, VID = 200mV
IO = 4mA, VID = –200mV
VCC = Max, 0.4V ꢂ Vo ꢂ 2.4V
0.4
1
V
Three-State (High Impedance) Output
Current at Receive, IOZR
µA
Receiver Input Resistance, RIN
Supply Current, ICC
70
kꢀ
–7V ꢂ VCM ꢂ 12V
120
80
200
120
µA
µA
No Load, Output Enabled
No Load, Output Disabled
Supply Current in Shutdown Mode, ISHDN
Driver Short-Circuit Ourrent, IOSD1
Driver Short-Circuit Ourrent, IOSD2
Receiver Short-Circuit Current, IOSR
1
10
µA
mA
mA
mA
DE = 0V, RE = VCC
35
35
7
250
VOUT = HIGH, –7V ꢂ VO ꢂ12V
VOUT = LOW, –7V ꢂ Vo ꢂ 12V
0V ꢂ VO ꢂ VOC
250
85
Rev. PrC
–2–
PRELIMINARY TECHNICAL DATA
ADM1487
ADM1487SPECIFICATIONS(continued)
ELECTRICAL CHARACTERISTICS (VCC = +5V 5ꢀ% ꢁA = ꢂ-0°C ꢁO +ꢃ5°C% UNLESS OꢁHERWISE NOꢁED)
Parameter
Min
Typ
Max
Units Test Conditions/Comments
Differential Driver Output Voltage, VOD1
Differential Driver Output Voltage, VOD2
5
V
Unloaded, IO = 0
2.0
1.5
V
V
Figure 1, R = 50ꢀ (RS-422)
Figure 1, R = 27ꢀ (RS-485)
5
3
Driver Common-Mode
Output Voltage, VOC
V
Figure 1, R = 27ꢀ or R = 50ꢀ
Differential Input Threshold
Voltage for Receiver, VTH
–0.2
0.2
V
–7V ꢂ VCM ꢂ 12V
Receiver Input Hysteresis, ꢁVTH
45
mV VCM = 0V
Supply Current, ICC
120
80
200
120
µA
µA
No Load, Output Enabled
No Load, Output Disabled
Supply Current in Shutdown Mode, ISHDN
Driver Input to Output High, tDPLH
1
10
µA
ns
DE = 0V, RE = VCC
150
150
1200
Figures 2, 3, RDIFF= 54ꢀ,
CL1 = CL2 = 100pF
Driver Input to Output Low, tDPHL
Driver Output to Output, tSKEW
Driver Rise or Fall Time, tDR, tDF
Receiver Input to Output High, tRPLH
Receiver Input to Output Low, tRHL
Differential Receiver Skew, tSKD
1200
600
ns
ns
Figures 2, 3, RDIFF= 54ꢀ,
CL1 = CL2 = 100pF
100
Figures 2, 3, RDIFF= 54ꢀ,
CL1 = CL2 = 100pF
150
30
2000
250
ns
Figures 2, 3, RDIFF= 54ꢀ,
CL1 = CL2 = 100pF
140
140
13
ns
Figures 2, 4, RDIFF= 54ꢀ,
CL1 = CL2 = 100pF
30
250
ns
Figures 2, 4, RDIFF= 54ꢀ,
CL1 = CL2 = 100pF
ns
Figures 2, 4, RDIFF= 54ꢀ,
|tRPLH-tRPHL
|
CL1 = CL2 = 100pF
Maximum Data Rate, fMAX
250
kbps
SWITCHING CHARACTERISTICS (VCC = +5V 5ꢀ% ꢁA = ꢂ-0°C ꢁO +ꢃ5°C% UNLESS OꢁHERWISE NOꢁED)
Parameter
Min
Typ
Max
Units TestConditions/Comments
Driver Input to Output High, tDPLH
150
1200
ns
ns
ns
ns
Figures 2, 3, RDIFF= 54ꢀ,
CL1 = CL2 = 100pF
Driver Input to Output, tDPHL
Driver Output to Output, tSKEW
Driver Rise or Fall Time, tDR, tDF
150
1200
600
Figures 2, 3, RDIFF= 54ꢀ,
CL1 = CL2 = 100pF
250
Figures 2, 3, RDIFF= 54ꢀ,
CL1 = CL2 = 100pF
150
1200
Figures 2, 3, RDIFF= 54ꢀ,
CL1 = CL2 = 100pF
Driver Enable to Output High, tDZH
Driver Enable to Output Low, tDZL
Driver Disable Time from Low, tDLZ
100
100
150
1500
1500
1500
ns
ns
ns
Figures 5, 6, CL = 100pF, S2 Closed
Figures 5, 6, CL = 100pF, S1 Closed
Figures 5, 6, CL = l5pF, S1 Closed
Rev. PrC
–3–
PRELIMINARY TECHNICAL DATA
ADM1487
ADM1487SPECIFICATIONS(continued)
SWITCHING CHARACTERISTICS (VCC = +5V 5ꢀ% ꢁA = ꢂ-0°C ꢁO +ꢃ5°C% UNLESS OꢁHERWISE NOꢁED)
Parameter
Min
150
30
Typ
Max
1500
250
Units Test Conditions/Comments
Driver Disable Time from High, tDHZ
Receiver Input to Output, tRPLH
ns
ns
Figures 5, 6, CL= l5pF, S2 Closed
140
140
13
Figures.2, 4, RDIFF= 54ꢀ,
CL1 = CL2 = 100pF
Receiver Input to Output Low, tRPHL
DifferentialReceiverSkew, tSKD
30
250
ns
ns
Figures.2, 4, RDIFF= 54ꢀ,
CL1 = CL2 = 100pF
Figures.2, 4, RDIFF= 54ꢀ,
|tPLH-tPHL
|
CL1 = CL2 = 100pF
Receiver Enable to Output Low, tRZL
Receiver Enable to Output High, tRZH
Receiver Disable from Low, tRLZ
Receiver Disable from High, tRHZ
Maximum Data Rate, fMAX
20
20
20
20
50
50
50
50
ns
ns
Figures 7, 8, CRL = l5pF, S1 Closed
Figures 7, 8, CRL = l5pF, S2 Closed
Figures 7, 8, CRL = l5pF, S1 Closed
Figures 7, 8, CRL = l5pF, S2 Closed
ns
ns
250
50
kbps
ns
Time to Shutdown, tSHDN
200
600
DE = 0, RE = low to high transition
Driver Enable from Shutdown to
Output High, tDZH(SHDN)
2000
ns
Figures 5, 6, CL = 100pF, S2 Closed
Driver Enable from Shutdown to
Output Low, tDZL(SHDN)
2000
2000
2000
ns
ns
ns
Figures 5, 6, CL = 100pF, S1 Closed
Figures 7, 8, CL = l5pF, S2 Closed
Figures 7, 8, CL = l5pF, S1 Closed
Receiver Enable from Shutdown to
Output High, tRZH(SHDN)
Receiver Enable from Shutdown to
Output Low, tRZL(SHDN)
NOTES
1Absolute maximum ratings are those beyond which the safety of the device cannot be guaranfeed.
2All currents into device pins are positive; all currents out ot device pins are negative. All voltages are referenced to device ground unless otherwise specified.
3All typicals are given for Vcc = 5V and Tp = 25°C.
4The ADM1487 is not tested and is not quality-assurance sampled at -40°C and at 85°C. These specifications are guaranteed by design, correlation, andlor inference from
0°C, 25°C and/or 70°C tests.
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (Vcc) . . . . . . . . . . . . . . . . . . . . . . . . . . 12V
Control Input Voltage . . . . . . . . . . . –0.5V to Vcc + 0.5V
Driver Input Voltage . . . . . . . . . . . –0.5V to Vcc + 0.5V
Driver Output Voltage . . . . . . . . . . . . . . . . . . . . . . . . 14V
Receiver InputVoltage . . . . . . . . . . . . . . . . . . . . . . . . 14V
Receiver Output Voltage . . . . . . . . . –0.5V to Vcc + 0.5V
Operating Temperature Range . . . . . . 0°C ꢂ TA ꢂ 70°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . 300°C
RO
RE
DE
DI
V
CC
1
2
3
4
8
7
6
5
B
ADM1487
TOP VIEW
(Not to Scale)
A
GND
ORDERING INFORMATION
Model Temperature Range Package Option
ADM1487JN 0°C to +70°C
ADM1487JR 0°C to +70°C
*Stressesabovethoselistedunder“AbsoluteMaximumRatings”maycausepermanent
damage to the device. This is a stress rating only; functional operation of the device
attheseoranyotherconditionsabovethoseindicatedintheoperationalsectionofthis
specification is not implied. Exposure to absolute maximum rating conditions for
extendedperiodsmayaffectdevicereliability.
8 Pin Plastic DIP
8 Pin SO
THERMAL CHARACTERISTICS
8-Pin Plastic DIP Package
θJA = tbd K/Watt, θJC = tbd K/Watt
8-Pin Plastic SO Package
ADM1487AN –40°C to +85°C
ADM1487AR –40°C to +85°C
8 Pin Plastic DIP
8 Pin SO
θJA = tbd K/Watt, θJC = tbd K/Watt
Rev. PrC
–4–
PRELIMINARY TECHNICAL DATA
ADM1487
ADM1487 TEST CIRCUITS AND TIMING
A
V
CC
R
V
OD
TEST
POINT
R
S1
S2
A
500V
V
OC
OUTPUT
UNDER
TEST
C
RL
15pF
Figure 1. Driver DC Load Test Circuit
3V
Figure 5. Test Load for Driver Enable/Disable Time Test
DE
D
A
B
f = 1MHz, t # 10ns, t # 10ns
r
f
C
L1
A
3V
0V
5V
VOL
DI
DE
A, B
A, B
V
1.5V
R
R
RO
OD2
DIFF
B
C
L2
tDLZ
tDZL(SHDN), tDZL
15pF
VOL+ 0.5V
2.3V
OUTPUT NORMALLY LOW
V
OH
OUTPUT NORMALLY HIGH
, tDZH
Figure 2. Driver/Receiver Timing Test Circuit
VOH- 0.5V
2.3
V
VOL
tDHZ
tDZH(SHDN)
f = 1MHz, t # 10ns, t # 10ns
r
f
3V
Figure 6. Driver Enable and Disable Times
DI
1.5V
0V
tDPLH
tD
PHL
V
CC
B
A
V0
V0/2
1kV
TEST
VDIFF = VA - VB
POINT
V0
0V
-V0
90%
tDF
90%
tDR
VDIFF
10%
10%
S1
RO
tSKEW = |tDPLH-tDPHL|
C
RL
15pF
S2
Figure 3. Driver Propagation Delays
f = 1MHz, t # 10ns, t # 10ns
r
f
1kV
A
B
VOD2
-VOD2
tRPHL
tRPLH
VOH
VOL
Figure 7. Test Load for Receiver Enable/Disable Time Test
1.5V
RO
3V
0V
5V
f = 1MHz, t # 10ns, t # 10ns
r f
RE
RO
RO
1.5
V
Figure 4. Receiver Propagation Delays
tRLZ
t
RZL(SHDN), tRZL
1.5
V
OUTPUT NORMALLY LOW
0.5V
0.5V
5V
OUTPUT NORMALLY HIGH
1.5
V
0V
tRHZ
tRZH(SHDN), tRZH
Figure 8. Receiver Enable and Disable Delay Times
Rev. PrC
–5–
PRELIMINARY TECHNICAL DATA
ADM1487
ADM1487TYPICALPERFORMANCECHARACTERISTICS
TPC1. No-load Supply Current vs. Tem-
perature
TPC2. Output Current vs. Receiver Out-
put High Voltage
TPC3. Output Current vs. Receiver Out-
put Low Voltage
TPC5. Receiver Output Low
Voltage vs. Temperature
TPC4. Receiver Output High
Voltage vs. Temperature
TPC6. Shutdown Current vs.
Temperature
PIN FUNCTION DESCRIPTION
Pin Mnemonic
Description
1
2
3
4
RO
RE
D E
DI
Receiver Output. When RE is low and A - B ꢃ (more positive than) 200mV, RO will be high.
When RE is low and A - B ꢂ (more negative than) –200mV, RO will be low.
Receiver Output Enable. Take RE low to enable RO; RO is high impedance when RE is high.
Take RE high and DE low to enter low-power shutdown mode.
Driver Output Enable. Take DE high to enable driver outputs. These outputs are high
impedance when DE is low. Take RE high and DE low to enter low-power shutdown mode.
Driver Input. With DE high, a low on DI forces non-inverting output low and inverting output
high. Similarly, a high on DI forces non-inverting output high and inverting output low.
5
6
7
8
GND
A
Ground
Non-Inverting Receiver Input and Non-Inverting Driver Output
Inverting Receiver Input and Inverting Driver Output
Positive Supply 4.75V =VCC =5.25V
B
VCC
Rev. PrC
–6–
PRELIMINARY TECHNICAL DATA
ADM1487
DEVICE TRUTH TABLES
RECEIVING
TRANSMITTING
INPUTS
OUTPUTS
INPUTS
OUTPUT
R E
X
D E
1
DI
1
Z
0
1
Y
R E
0
D E
X
A-B
ꢃ 0.2V
ꢂ -0.2V
Open/shorted
X
R O
1
0
1
X
1
0
0
X
0
0
0
X
X
High-Z
High-Z
0
X
1
1
0
Shutdown*
1
0
Shutdown*
X = Don’t care
CIRCUIT DESCRIPTION
*In shutdown mode, driver and receiver outputs high impedance
SHUTDOWN MODE
If RE is taken high while DE is taken low, the device will
enter a low-power shutdown mode, in which the supply
current is typically 1µA.
The ADM1487 is a differential input, differential output
transceiver designed RS-485/RS-422 serial data communi-
cations over twisted-pair cables. It is a half-duplex device
intended for alternate transmission and reception of data
over a single twisted-pair cable, and the driver outputs and
receiver inputs are internally linked and brought out to a
single pair of pins.
If the driver outputs are active immediately before shut-
down (DE high), the supply current will not drop to 1µ
until the driver outputs have settled to their three-state
mode, which can take up to 2.6µs worst-case. If DE is al-
ready low and shutdown is entered by taking RE high, the
supply current will drop to 1µA very quickly.
When RE is taken low and/or DE is takem high, the de-
vice will wake up within 3.5µs.
Its principal features include ultra-low power operation, a
controlled slew-rate driver that minimizes electromagnetic
interference (EMI) and signals reflections due to incor-
rectly terminated lines, and high input impedance that al-
lows up to 256 receivers to be connected to a bus.
If shutdown mode is not used, the fact that DE is active-
high and RE is active-low offers a convenient way of
switching the device between transmit and receive, by ty-
ing DE and RE together. This is useful, for example, in
applications using half duplex operation and where several
receiver outputs are connected to a serial bus.
THREE-STATE BUS CONNECTION
The ADM1487 has a Driver Enable pin (DE) that enables
the driver outputs when taken high or puts the driver out-
puts into a high-impedance state when taken low. This al-
lows several driver outputs to be connected to an RS-422/
RS-485 bus.
The device is guaranteed not to enter shutdown mode if
DE and RE are driven in this way. If DE is low and RE is
high for less than 50ns the device will not enter shutdown.
If DE is low and RE is high for greater than 600ns, the
device is guaranteed to enter shutdown.
Similarly, the device has a (active-low) Receiver Enable
pin (RE). Taking this low enables the receiver, while tak-
ing it high puts the receiver outputs into a high-impedance
state. This allows several receiver outputs to be connected
to a serial data bus.
RECEIVER INPUTS
The ADM1487 receiver has an input common-mode
range covering the entire RS-485 range of –7V to 12V.
Internal 96kꢀ input resistors from each line terminal to
ground provide a 1/8 unit load to the RS485 bus.
The input impedance of the device is 96kꢀ, which is 8
times higher than the standard RS-485 load of 12kꢀ. A
standard driver can driver 32 standard loads, so up to 256
ADM1487 receivers, or a combination of ADM1487 and
other devices up to 32 unit loads, may be connected to an
RS-422/RS485 bus driven by a single driver.
Differential signals greater than 200mV within the speci-
fied input common-mode range are converted to a TTL-
compatible logic signal at the receiver output. A small
amount of input hysteresis is included to minimize the ef-
fects of noise on the line signals. If the line is terminated
or the receiver inputs are shorted together, the receiver
output will retain the last valid line signal due to the
45mV of hysteresis incorporated in the receiver circuit. If
the receiver inputs are left floating (unterminated), an in-
ternal pull-up of 10µA at the A input will force the re-
ceiver output to a guranteed high output state.
LOW POWER OPERATION
The ADM1487 draws very little supply current (typically
80µA) when the driver outputs are disabled or unloaded.
This will increase by up to 72µA if the driver outputs are
enabled (but unloaded) and applying the maximum output
swing of 5V across the receiver input resistors.
However, in practical applications with the device driving
and RS-485/RS422 cable or bus, the current drain is
dominated by the current sourced into the line termination
resistors and any other devices on the bus. With a half-ter-
mination (120ꢀ load) between the driver outputs, the load
current can be in excess of 13mA as the drivers force a
minimum of 1.5V across the line, and can be greater than
25mA with a fully terminated 60ꢀ line attached.
DRIVER OUTPUT STAGE
The RS-485 specification requires that a transceiver with-
stand common-mode voltages of up to 12V above or –7V
below system ground at the RS-485 line connections.
In addition, the transceiver must be protected against both
ESD and latch-up. This precludes the use of conventional
Rev. PrC
–7–
PRELIMINARY TECHNICAL DATA
ADM1487
CMOS outout stages, which include parasitic diodes from
their driver outputs to each supply rail and can latch up
when these diodes conduct.
CURRENT LIMIT AND THERMAL SHUTDOWN
The ADM1487 incorporates two protection mechanisms to
guard the drivers against short-circuits, bus contention or
other fault conditions. The first is a current-limited output
stage that protects the driver against short-circuits over the
entire common-mode voltage range by limiting the output
current to about 70mA. Under extreme fault condtions
where the current limit is not effective, a thermal shutdown
circuit puts the driver outputs into a high-impedance state if
the die temperature exceeds 150°C, and does not turn them
back on until the temperature has fallen to 130°C.
V
CC
SCHOTTKY
REVERSE-BIASED
WHEN OUTPUT
> V +V
CC
D
PARASITIC
DIODE D
P
SCHOTTKY
REVERSE-BIASED
WHEN OUTPUT
< GND - V
D
PARASITIC
DIODE D
P
ENHANCED ESD PROTECTION
All Analog Devices parts incorporate protection against
electrostatic discharge (ESD) to protect the devices dur-
ing handling, assembly and normal operation. In addition,
the ADM1487 has enhanced ESD protection up to 10kV
on the A and B I/O pins to protect against severe opera-
tional conditions such as line transients, connection and
disconnection.
Figure 9. ADM1487 Driver Output Stage
The ADM1487 output includes Schottky diodes in series
with the positive supply to the drain of the P-channel output
device and in series with the drain of the N-channel output
device. These diodes prevent the P-channel's parasitic diode
from conducting when the output voltage exceeds VCC and
prevent the N-channel's parasitic diode from conducting
when the output voltage falls below ground.
APPLICATION INFORMATION
Figure 10 shows a typical application of the ADM1487.
This is a half-duplex RS-485/RS-422 network. Up to 254
additional ADM1487s can be connected along the cable
(termination resistors are only required at each end).
SLEW RATE CONTROL
The driver output stage of the ADM1487 has a controlled
slew rate to minmize signal reflections on incorrectly termi-
nated lines and to reduce electromagnetic interference (EMI).
+5V
(V
CC
100n
RECEIVER
OUTPUT
)
5
6
7
8
4
3
2
1
DI
1
2
3
4
8
7
6
5
D
CABLE TERMINATED
AT ENDS
(RO)
R
RECEIVER
B
R
DE
ENABLE
R
T
T
(RE)
DRIVER
RE
ENABLE
A
R
+5V (V
100n
)
CC
(DE)
RO
D
DATA
B
A A
B
IN (DI)
ADDITIONAL
ADM1487s
ADM1487
ADM1487
Figure 10. Typical Half-Duplex RS-485/RS-422 Network
OUTLINE DIMENSIONS
Dimensionsshownininchesand(mm).
8-Pin Plastic Dual-In-Line Package (N-8)
8-Pin SO Package (R-8)
0.430 (10.92)
0.348 (8.84)
0.1968 (5.00)
0.1890 (4.80)
8
5
0.280 (7.11)
0.240 (6.10)
85
0.1574 (4.00)
0.2440 (6.20)
0.2284 (5.80)
14
0.325 (8.25)
0.300 (7.62)
0.1497 (3.80)
1
4
0.060 (1.52)
0.015 (0.38)
PIN 1
0.195 (4.95)
0.115 (2.93)
0.210 (5.33)
MAX
0.102 (2.59)
0.094 (2.39)
PIN 1
0.0196 (0.50)
0.0099 (0.25)
0.130
(3.30)
MIN
x 45
0.160 (4.06)
0.115 (2.93)
0.015 (0.381)
0.008 (0.204)
0.0098 (0.25)
0.0040 (0.10)
SEATING
PLANE
0.100
(2.54)
BSC
0.022 (0.558)
0.014 (0.356)
0.070 (1.77)
0.045 (1.15)
8
0
0.0500 0.0192 (0.49)
0.0500 (1.27)
0.0160 (0.41)
SEATING
PLANE
0.0098 (0.25)
0.0075 (0.19)
(1.27)
0.0138 (0.35)
BSC
Rev. PrC
–8–
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