AD ADM1487

PRELIMINARY TECHNICAL DATA
Ultra-Low Power RS-485/RS-422 Transceiver
with Low EMI and +/-10kV ESD Protection
a
ADM1487
Preliminary Technical Data
FEATURES
Low Power - 120µA Max ICC with Driver Disabled
GENERAL DESCRIPTION
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
±10kV ESD Protection (Human Body 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 electromagnetic interference (EMI) and reduce reflections
caused by incorrectly terminated cables.
Wide Common-Mode Range Allows ±7V Ground Differences Between Devices
Pin-Compatible with Industry Standard 75176
APPLICATIONS
Battery-Powered RS-485/RS-422 Systems
Level Translation
FUNCTIONAL BLOCK DIAGRAM
RO
1
8
VCC
R
RE
2
7
B
DE
3
6
A
DI
4
5
GND
D
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 Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 2002
–1–
PRELIMINARY TECHNICAL DATA
ADM1487
ADM1487 SPECIFICATIONS
DC ELECTRICAL CHARACTERISTICS (VCC = +5V ±5%, TA = 0°C TO +70°C, UNLESS OTHERWISE NOTED)
Parameter
Min
Typ
Differential Driver Output Voltage,VOD1
Differential Driver Output Voltage, VOD2
2.0
1.5
Change in Magnitude of Driver
Differential Output Voltage for
Complementary Output States, VOD
Driver Common-Mode Output
Voltage, VOC
Change in Magnitude of Driver
Common-Mode Output Voltage for
Complementary Output States, |VOC|
Input High Voltage (DE, DI, RE), VIH
Max
Units
5
V
Unloaded, IO = 0
5
V
V
Figure 1, R = 50 (RS-422)
Figure 1, R = 27 (RS-485)
0.2
V
Figure 1, R = 27 or R = 50
3
V
Figure 1, R = 27 or R = 50
0.2
V
R = 27 or R = 50
2
V
Input Low Voltage (DE, DI, RE), VIL
0.8
V
Input Current (DE, DI, RE), IIN1
±2
µA
0.30
-0.15
mA
mA
0.2
V
Input Current (A, B), IIN2
Differential Input Threshold Voltage
for Receiver, VTH
-0.2
Receiver Input Hysteresis, VTH
Receiver Output High Voltage, VOH
Test Conditions/Comments
45
mV
3.5
DE = 0, VCC= 0V or 5.25V, VIN = 12V
DE = 0, VCC = 0V or 5.25V, VIN = –7V
–7V VCM 12V
VCM = 0V
V
IO =-4mA, VID = 200mV
Receiver Output Low Voltage, VOL
0.4
V
IO = 4mA, VID = –200mV
Three-State (High Impedance) Output
Current at Receive, IOZR
±1
µA
VCC = Max, 0.4V Vo 2.4V
k
–7V VCM 12V
Receiver Input Resistance, RIN
70
Supply Current, ICC
Supply Current in Shutdown Mode, ISHDN
Driver Short-Circuit Ourrent, IOSD1
35
Driver Short-Circuit Ourrent, IOSD2
35
Receiver Short-Circuit Current, IOSR
7
96
120
80
200
120
µA
µA
No Load, Output Enabled
No Load, Output Disabled
1
10
µA
DE = 0V, RE = VCC
250
mA
VOUT = HIGH, –7V VO 12V
mA
VOUT = LOW, –7V Vo 12V
mA
0V VO VOC
250
85
–2–
Rev. PrC
PRELIMINARY TECHNICAL DATA
ADM1487
ADM1487 SPECIFICATIONS (continued)
ELECTRICAL CHARACTERISTICS (VCC = +5V ±5%, TA = -40°C TO +85°C, UNLESS OTHERWISE NOTED)
Parameter
Min
Typ
Differential Driver Output Voltage, VOD1
Differential Driver Output Voltage, VOD2
2.0
1.5
Driver Common-Mode
Output Voltage, VOC
Differential Input Threshold
Voltage for Receiver, VTH
–0.2
Receiver Input Hysteresis, VTH
45
Supply Current, ICC
120
80
1
Supply Current in Shutdown Mode, ISHDN
Max
Units Test Conditions/Comments
5
V
Unloaded, IO = 0
5
V
V
Figure 1, R = 50 (RS-422)
Figure 1, R = 27 (RS-485)
3
V
Figure 1, R = 27 or R = 50
0.2
V
–7V VCM 12V
mV
VCM = 0V
200
120
µA
µA
No Load, Output Enabled
No Load, Output Disabled
10
µA
DE = 0V, RE = VCC
Driver Input to Output High, tDPLH
150
1200
ns
Figures 2, 3, RDIFF= 54,
CL1 = CL2 = 100pF
Driver Input to Output Low, tDPHL
150
1200
ns
Figures 2, 3, RDIFF= 54,
CL1 = CL2 = 100pF
600
ns
Figures 2, 3, RDIFF= 54,
CL1 = CL2 = 100pF
2000
ns
Figures 2, 3, RDIFF= 54,
CL1 = CL2 = 100pF
100
Driver Output to Output, tSKEW
Driver Rise or Fall Time, tDR, tDF
150
Receiver Input to Output High, tRPLH
30
140
250
ns
Figures 2, 4, RDIFF= 54,
CL1 = CL2 = 100pF
Receiver Input to Output Low, tRHL
30
140
250
ns
Figures 2, 4, RDIFF= 54,
CL1 = CL2 = 100pF
ns
Figures 2, 4, RDIFF= 54,
CL1 = CL2 = 100pF
Differential Receiver Skew, tSKD
|tRPLH-tRPHL|
Maximum Data Rate, fMAX
13
250
kbps
SWITCHING CHARACTERISTICS (VCC = +5V ±5%, TA = -40°C TO +85°C, UNLESS OTHERWISE NOTED)
Parameter
Min
Typ
Driver Input to Output High, tDPLH
150
1200
ns
Figures 2, 3, RDIFF= 54,
CL1 = CL2 = 100pF
Driver Input to Output, tDPHL
150
1200
ns
Figures 2, 3, RDIFF= 54,
CL1 = CL2 = 100pF
600
ns
Figures 2, 3, RDIFF= 54,
CL1 = CL2 = 100pF
250
Driver Output to Output, tSKEW
Max
Units Test Conditions/Comments
Driver Rise or Fall Time, tDR, tDF
150
1200
ns
Figures 2, 3, RDIFF= 54,
CL1 = CL2 = 100pF
Driver Enable to Output High, tDZH
100
1500
ns
Figures 5, 6, CL = 100pF, S2 Closed
Driver Enable to Output Low, tDZL
100
1500
ns
Figures 5, 6, CL = 100pF, S1 Closed
Driver Disable Time from Low, tDLZ
150
1500
ns
Figures 5, 6, CL = l5pF, S1 Closed
Rev. PrC
–3–
PRELIMINARY TECHNICAL DATA
ADM1487
ADM1487 SPECIFICATIONS (continued)
SWITCHING CHARACTERISTICS (VCC = +5V ±5%, TA = -40°C TO +85°C, UNLESS OTHERWISE NOTED)
Parameter
Min
Driver Disable Time from High, tDHZ
150
Receiver Input to Output, tRPLH
30
Receiver Input to Output Low, tRPHL
30
Typ
Max
Units Test Conditions/Comments
1500
ns
Figures 5, 6, CL= l5pF, S2 Closed
140
250
ns
Figures.2, 4, RDIFF= 54,
CL1 = CL2 = 100pF
140
250
ns
Figures.2, 4, RDIFF= 54,
CL1 = CL2 = 100pF
ns
Figures.2, 4, RDIFF= 54,
CL1 = CL2 = 100pF
DifferentialReceiverSkew, tSKD
|tPLH-tPHL|
13
Receiver Enable to Output Low, tRZL
20
50
ns
Figures 7, 8, CRL = l5pF, S1 Closed
Receiver Enable to Output High, tRZH
20
50
ns
Figures 7, 8, CRL = l5pF, S2 Closed
Receiver Disable from Low, tRLZ
20
50
ns
Figures 7, 8, CRL = l5pF, S1 Closed
Receiver Disable from High, tRHZ
20
50
ns
Figures 7, 8, CRL = l5pF, S2 Closed
Maximum Data Rate, fMAX
250
Time to Shutdown, tSHDN
50
kbps
600
ns
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
ns
Figures 5, 6, CL = 100pF, S1 Closed
Receiver Enable from Shutdown to
Output High, tRZH(SHDN)
2000
ns
Figures 7, 8, CL = l5pF, S2 Closed
Receiver Enable from Shutdown to
Output Low, tRZL(SHDN)
2000
ns
Figures 7, 8, CL = l5pF, S1 Closed
200
NOTES
1
Absolute maximum ratings are those beyond which the safety of the device cannot be guaranfeed.
All currents into device pins are positive; all currents out ot device pins are negative. All voltages are referenced to device ground unless otherwise specified.
3
All typicals are given for Vcc = 5V and Tp = 25°C.
4
The 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.
2
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 TA 70°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . 300°C
*Stresses above those listed under “Absolute Maximum Ratings” may cause permanent
damage to the device. This is a stress rating only; functional operation of the device
at these or any other conditions above those indicated in the operational section of this
specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
THERMAL CHARACTERISTICS
8-Pin Plastic DIP Package
θJA = tbd K/Watt, θJC = tbd K/Watt
8-Pin Plastic SO Package
θJA = tbd K/Watt, θJC = tbd K/Watt
–4–
RO
1
RE
2
ADM1487
7 B
DE
3
TOP VIEW
(Not to Scale)
6 A
DI
4
8 VCC
5 GND
ORDERING INFORMATION
Model
Temperature Range
Package Option
ADM1487JN
0°C to +70°C
8 Pin Plastic DIP
ADM1487JR
0°C to +70°C
8 Pin SO
ADM1487AN –40°C to +85°C
8 Pin Plastic DIP
ADM1487AR
8 Pin SO
–40°C to +85°C
Rev. PrC
PRELIMINARY TECHNICAL DATA
ADM1487
ADM1487 TEST CIRCUITS AND TIMING
A
VCC
R
VOD
TEST
POINT
R
S1
A
VOC
500V
OUTPUT
UNDER
TEST
CRL
15pF
S2
Figure 1. Driver DC Load Test Circuit
3V
Figure 5. Test Load for Driver Enable/Disable Time Test
DE
A
VOD2
D
f = 1MHz, tr # 10ns, tf # 10ns
CL1
A
DI
R
RDIFF
B
3V
CL2
DE
RO
5V
15pF
A, B
VOL
VOH
A, B
VOL
Figure 2. Driver/Receiver Timing Test Circuit
tDLZ
tDZL(SHDN), tDZL
2.3V
2.3
Vt
VOL+ 0.5V
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
VOH- 0.5V
tDHZ
DZH(SHDN), tDZH
f = 1MHz, tr # 10ns, tf # 10ns
3V
DI
1.5V
0V
B
Figure 6. Driver Enable and Disable Times
1.5V
0V
tDPLH
tDPHL
VCC
B
V0
A
V0/2
VDIFF
V0
0V
-V0
TEST
POINT
VDIFF = VA - VB
10%
90%
90%
tDR
10%
S1
tDF
RO
tSKEW = |tDPLH-tDPHL|
CRL
15pF
Figure 3. Driver Propagation Delays
f = 1MHz, tr # 10ns, tf # 10ns
A VOD2
1kV
S2
1kV
B -VOD2
VOH
tRPHL
tRPLH
Figure 7. Test Load for Receiver Enable/Disable Time Test
1.5V
RO
VOL
f = 1MHz, tr # 10ns, tf # 10ns
3V
RE
Figure 4. Receiver Propagation Delays
1.5
V
0V
tRZL(SHDN), tRZL
5V
RO
1.5
V
5V
RO
0V
tRLZ
OUTPUT NORMALLY LOW
0.5V
OUTPUT NORMALLY HIGH
1.5
V
tRZH(SHDN), tRZH
0.5V
tRHZ
Figure 8. Receiver Enable and Disable Delay Times
Rev. PrC
–5–
PRELIMINARY TECHNICAL DATA
ADM1487
ADM1487 TYPICAL PERFORMANCE CHARACTERISTICS
AW
A
I
IT
NG
T
DA
A
AW
TPC1. No-load Supply Current vs. Temperature
AW
AI
N
TI
G
T
DA
A
I
IT
NG
A
AW
TPC2. Output Current vs. Receiver Output High Voltage
A
AW
TPC4. Receiver Output High
Voltage vs. Temperature
T
A
D
AI
N
TI
G
T
DA
AI
N
TI
G
A
TPC3. Output Current vs. Receiver Output Low Voltage
A
AW
TPC5. Receiver Output Low
Voltage vs. Temperature
T
DA
AI
N
TI
G
T
DA
A
TPC6. Shutdown Current vs.
Temperature
PIN FUNCTION DESCRIPTION
Pin Mnemonic
Description
1
RO
Receiver Output. When RE is low and A - B (more positive than) 200mV, RO will be high.
When RE is low and A - B (more negative than) –200mV, RO will be low.
2
RE
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.
3
DE
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.
4
DI
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
GND
Ground
6
A
Non-Inverting Receiver Input and Non-Inverting Driver Output
7
B
Inverting Receiver Input and Inverting Driver Output
8
VCC
Positive Supply 4.75V =VCC =5.25V
–6–
Rev. PrC
PRELIMINARY TECHNICAL DATA
ADM1487
DEVICE TRUTH TABLES
TRANSMITTING
RECEIVING
INPUTS
OUTPUTS
INPUTS
OUTPUT
RE
DE
DI
Z
Y
RE
DE
A-B
RO
X
1
1
0
1
0
X
0.2V
1
X
1
0
1
0
0
X
-0.2V
0
0
0
X
High-Z
High-Z
0
X
Open/shorted
1
0
X
1
0
X
Shutdown*
1
Shutdown*
X = Don’t care
*In shutdown mode, driver and receiver outputs high impedance
CIRCUIT DESCRIPTION
SHUTDOWN MODE
The ADM1487 is a differential input, differential output
transceiver designed RS-485/RS-422 serial data communications 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.
Its principal features include ultra-low power operation, a
controlled slew-rate driver that minimizes electromagnetic
interference (EMI) and signals reflections due to incorrectly terminated lines, and high input impedance that allows up to 256 receivers to be connected to a 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 outputs into a high-impedance state when taken low. This allows several driver outputs to be connected to an RS-422/
RS-485 bus.
Similarly, the device has a (active-low) Receiver Enable
pin (RE). Taking this low enables the receiver, while taking it high puts the receiver outputs into a high-impedance
state. This allows several receiver outputs to be connected
to a serial data bus.
The input impedance of the device is 96k, which is 8
times higher than the standard RS-485 load of 12k. 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.
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-termination (120 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 60 line attached.
Rev. PrC
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.
If the driver outputs are active immediately before shutdown (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 already 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 device will wake up within 3.5µs.
If shutdown mode is not used, the fact that DE is activehigh and RE is active-low offers a convenient way of
switching the device between transmit and receive, by tying 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.
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.
RECEIVER INPUTS
The ADM1487 receiver has an input common-mode
range covering the entire RS-485 range of –7V to 12V.
Internal 96k input resistors from each line terminal to
ground provide a 1/8 unit load to the RS485 bus.
Differential signals greater than ±200mV within the specified input common-mode range are converted to a TTLcompatible logic signal at the receiver output. A small
amount of input hysteresis is included to minimize the effects 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 internal pull-up of 10µA at the A input will force the receiver output to a guranteed high output state.
DRIVER OUTPUT STAGE
The RS-485 specification requires that a transceiver withstand 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
–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.
VCC
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.
S CH O T T KY
RE V E RS E -BIA S E D
W H E N O UT P UT
> V CC +V D
P A RA S ITIC
DIO DE D P
S C HO TT K Y
R E V ER S E -B IAS E D
W HE N O U TP U T
< GND - VD
P A RA S IT IC
D IO D E D P
ENHANCED ESD PROTECTION
All Analog Devices parts incorporate protection against
electrostatic discharge (ESD) to protect the devices during 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 operational 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 terminated lines and to reduce electromagnetic interference (EMI).
RECEIVER
OUTPUT
(RO)
RECEIVER
ENABLE
(RE)
DRIVER
ENABLE
(DE)
DATA
+5V
(VCC
)
CABLE TERMINATED
AT ENDS
100n
1
8
R
2
7
B
5
6
RT
3
6
4
5
D
RT
A
+5V (VCC)
B A B A
IN (DI)
7
4
DI
3
DE
2
RE
1
RO
R
8
100n
ADDITIONAL
ADM1487s
ADM1487
D
ADM1487
Figure 10. Typical Half-Duplex RS-485/RS-422 Network
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
8-Pin Plastic Dual-In-Line Package (N-8)
8-Pin SO Package (R-8)
0. 43 0 (10 . 92 )
0. 19 6 8 (5 . 00 )
0. 34 8 (8.84 )
8
0. 18 9 0 (4 . 80 )
5
0. 28 0 (7.11 )
85
0. 24 0 (6.10 )
14
P IN 1
0. 06 0 (1. 52 )
0. 01 5 (0. 38 )
0.21 0 (5. 33 )
MAX
0. 16 0 (4.06 )
0. 11 5 (2.93 )
0. 02 2 (0.5 58 ) 0.1 0 0 0.07 0 (1. 77 )
0. 01 4 (0.3 56 ) (2 .54 ) 0.04 5 (1. 15 )
BS C
0.1 3 0
(3 .30 )
M IN
S E A TI N G
PLANE
0. 15 7 4 (4 . 00 )
0. 24 4 0 (6 . 20 )
0. 32 5 (8. 25 )
0. 22 8 4 (5 . 80 )
0. 30 0 (7. 62 )
1
4
0. 14 9 7 (3 . 80 )
0. 19 5 (4. 95 )
0. 11 5 (2. 93 )
PIN 1
0. 01 5 (0. 3 81 )
0. 10 2 (2.59 )
0. 01 9 6 (0 .50 )
0. 09 4 (2.39 )
0. 00 9 9 (0 .25 )
x 45
0. 00 9 8 (0 .25 )
0. 00 8 (0. 2 04 )
0. 00 4 0 (0 .10 )
S E A TI N G
PL A N E
–8–
0. 0 5 00
(1 . 27 )
BSC
0. 01 9 2 (0 . 49 )
0. 01 3 8 (0 . 35 )
0. 00 9 8 (0 .25 )
0. 00 7 5 (0 .19 )
8
0
0. 05 0 0 (1 .27 )
0. 01 6 0 (0 .41 )
Rev. PrC