LTC1320 [Linear]
AppleTalk Transceiver; 收发器的AppleTalk
| 型号： | LTC1320 |
| 厂家： | 
Linear |
| 描述： | AppleTalk Transceiver |
| 文件： | 总8页 (文件大小：214K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1320
AppleTalk© Transceiver
U
DESCRIPTIO
EATURE
S
F
■
Single Chip Provides Complete
The LTC1320 is an RS422/RS562 line transceiver de-
signed to operate on LocalTalk networks. It provides one
differential RS422 driver, one single-ended RS562 driver,
two single-ended RS562 receivers, and one differential
RS422 receiver. The LTC1320 draws only 1.2mA quies-
cent current when active and 30µA in shutdown, making
it ideal for use in battery-powered devices and other
systems where power consumption is a primary concern.
LocalTalk©/AppleTalk© Port
■
■
■
Low Power: ICC = 1.2mA Typ
Shutdown Pin Reduces ICC to 30µA Typ
Drivers Maintain High Impedance in Three-State
or with Power Off
30ns Driver Propagation Delay Typ
5ns Driver Skew Typ
■
■
■
■
Thermal Shutdown Protection
Drivers are Short-Circuit Protected
TheLTC1320driversarespecifiedtodrive ±2Vinto100Ω.
Additionally, thedriveroutputsthree-statewhendisabled,
during shutdown, or when the power is off; they maintain
high impedance even with output common-mode volt-
ages beyond the power supply rails. Both the driver
outputs and receiver inputs are protected against ESD
damage to beyond 5kV.
O U
PPLICATI
A
S
■
■
■
LocalTalk Peripherals
Notebook/Palmtop Computers
Battery-Powered Systems
The LTC1320 is available in the 18-pin SOL package.
AppleTalk and LocalTalk are registered trademarks of Apple Computer, Inc.
U
O
TYPICAL APPLICATI
Output Waveforms
Typical LocalTalk Connection
5V
18
LocalTalk
TRANSFORMER
22Ω
22Ω
22Ω
17
16
DATA IN
5V/DIV
1
3
5
100pF
22Ω
DATA IN
TX ENABLE
RX ENABLE
DATA OUT
120Ω
2V/DIV
100pF
LTC1320
#1
1k
SIGNALS
ON LINE
22Ω
22Ω
22Ω
11
10
1k
8
4
2V/DIV
100pF
22Ω
SHUTDOWN
LTC1320 • TA01
100pF
5V/DIV
DATA OUT
9
14
–5V
(REMOTE
RECEIVER)
50ns/DIV
1
LTC1320
W W W
U
ABSOLUTE AXI U RATI GS
/O
PACKAGE RDER I FOR ATIO
Supply Voltage (VDD)................................................ 7V
Supply Voltage (VSS) .............................................. –7V
Input Voltage (Logic Inputs) ......... –0.3V to VDD + 0.3V
Input Voltage (Receiver Inputs) ............................ ±15V
Driver Output Voltage (Forced) ............................. ±15V
Output Short-Circuit Duration......................... Indefinite
Operating Temperature Range ................... 0°C ot 70°C
Storage Temperature Range ................ –65°c to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C
TOP VIEW
ORDER PART
1
2
3
4
5
6
7
8
9
V
NUMBER
18
17
16
15
14
13
12
11
10
TXD
TXI
DD
–
+
TXD
TXD
TXO
TXDEN
SD
LTC1320CS
V
RXEN
RXO
SS
RXI
RXI
RXO
–
+
RXD
RXD
RXDO
GND
S PACKAGE
18-LEAD PLASTIC SOL
LTC1320 • PO01
TJMAX = 150°C, θJA = 100°C/W
Consult factory for Industrial and Military grade parts.
DC ELECTRICAL CHARACTERISTICS
VS = ±5V ±5%, TA = 0°C to 70°C (Notes 2, 3)
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OD
Differential Driver Output Voltage
No Load
L
●
●
8.0
2.0
V
V
R = 100Ω (Figure 1)
Change in Magnitude of Driver
Differential Output Voltage
R = 100Ω (Figure 1)
0.2
3
V
L
V
OC
Driver Common-Mode Output Voltage
Output Common-Mode Range
R = 100Ω (Figure 1)
L
V
V
SD = 5V or Power Off
No Load
R = 400Ω
L
●
±10
Single-Ended Driver Output Voltage
●
●
±4.0
±3.4
V
V
Input High Voltage
All Logic Input Pins
All Logic Input Pins
All Logic Input Pins
●
●
●
●
●
●
●
●
●
●
●
2.0
V
V
Input Low Voltage
0.8
±20
±100
500
Input Current
±1
±2
µA
µA
mA
kΩ
V
Three-State Output Current
Driver Short-Circuit Current
Receiver Input Resistance
SD = 5V or Power Off, –10V < V < 10V
O
–5V < V < 5V
35
12
350
O
–7V < V < 7V
IN
V
V
Receiver Output High Voltage
Receiver Output Low Voltage
Receiver Output Short-Circuit Current
Receiver Output Three-State Current
Differential Receiver Threshold Voltage
Differential Receiver Input Hysteresis
Single-Ended Receiver Input Low Voltage
Single-Ended Receiver Input High Voltage
Supply Current
I = –4mA
O
3.5
OH
I = 4mA
O
0.4
85
V
OL
0V < V < 5V
7
mA
µA
mV
mV
V
O
0V < V < 5V
±2
±100
200
O
–7V < V < 7V
–200
CM
–7V < V < 7V
70
CM
●
●
0.8
2
V
I
I
No Load, SD = 0V
No Load, SD = 5V
●
●
1.2
30
3.0
350
mA
µA
DD
Supply Current
No Load, SD = 5V
●
2
350
µA
SS
2
LTC1320
U
SWITCHI G CHARACTERISTICS
VS = ±5V ±5%, TA = 0°C to 70°C (Notes 2, 3)
CONDITIONS MIN
R = 100Ω, C = 100pF (Figures 2, 8)
SYMBOL PARAMETER
TYP
40
10
15
50
50
40
15
60
30
30
MAX
120
50
UNITS
ns
t
t
t
t
t
t
t
t
t
t
Differential Driver Propagation Delay
Differential Driver Output to Output
Differential Driver Rise/Fall Time
Driver Enable to Output Active
●
●
●
●
●
●
●
●
●
●
PLH, HL
SKEW
r, f
L
L
R = 100Ω, C = 100pF (Figures 2, 8)
L
ns
L
R = 100Ω, C = 100pF (Figures 2, 8)
L
80
ns
L
C = 100pF (Figures 3, 4, 10)
L
150
150
120
80
ns
ENH, L
H, Ldis
PLH, HL
r, f
Driver Output Active to Disable
Single-Ended Driver Propagation Delay
Single-Ended Driver Rise/Fall Time
Receiver Propagation Delay
C = 15pF (Figures 3, 4, 10)
L
ns
R = 450Ω, C = 100pF (Figures 5, 11)
L
ns
L
R = 450Ω, C = 100pF (Figures 5, 12)
L
ns
L
C = 15pF (Figures 13, 14)
L
160
100
100
ns
PLH, HL
ENH, L
H, Ldis
Receiver Enable to Output Active
Receiver Output Active to Disable
C = 100pF (Figures 6, 7, 15)
L
ns
C = 15pF (Figures 6, 7, 15)
L
ns
The
●
denotes specifications which apply over the full operating
Note 2: All currents into device pins are positive; all currents out of
device pins are negative. All voltages are referenced to ground unless
otherwise specified.
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 3: All typicals are given at V = ±5V, T = 25°C.
S
A
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Differential Output Swing vs
Load Current
Output Swing vs Load Current
Supply Current vs Temperature
1.2
1.1
1.0
5
4
10
8
OUTPUT HIGH
3
I
DD
2
6
1
0
–1
–2
–3
–4
–5
4
0.004
0.002
0
2
OUTPUT LOW
I
SS
0
0
20
40
60
80
100
0
20
40
60
80
100
0
10
20
30
40
50
60
70
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
LTC1320 • G01
LTC1320 • G02
LTC1320 • G03
U
U
U
PI FU CTIO S
RS422 driver into three-state; a low level enables the
driver. This input does not affect the RS562 single-ended
driver.
TXD(Pin1):RS422DifferentialDriverInput(TTLCompat-
ible).
TXI (Pin 2): RS562 Single-Ended Driver Input (TTL com-
patible.
SD (Pin 4): Shutdown Input (TTL Compatible). When this
pin is high, the chip is shut down: all driver outputs three-
state and the supply current drops to 30µA. A low on this
pin allows normal operation.
TXDEN (Pin 3): RS422 Differential Driver Output Enable
(TTL Compatible). A high level on this pin forces the
3
LTC1320
U
U
U
PI FU CTIO S
RXEN (Pin 5): Receiver Enable (TTL Compatible). A high
levelonthispindisablesthereceiversandthree-statesthe
logic outputs; a low level allows normal operation. To
prevent erratic behavior at the receiver outputs during
shutdown, RXEN should be pulled high along with SD.
RXI (Pin 12): Noninverting RS562 Receiver Input. This
input controls the RXO output; it has no effect on the RXO
output.
RXI (Pin 13): Inverting RS562 Receiver Input. This input
controls the RXO output; it has no effect on the RXO
output.
RXO (Pin 6): Inverting RS562 Single-Ended Receiver
Output.
VSS (Pin14): NegativeSupply. –4.75≥VSS ≥–5.25V. The
voltageonthispinmustneverexceedgroundonpowerup
or power-down.
RXO (Pin 7): Noninverting RS562 Single-Ended Receiver
Output.
RXDO (Pin 8): RS422 Differential Receiver Output.
GND (Pin 9): Ground Pin.
RXD+ (Pin 10): RS422 Differential Receiver Noninverting
Input. When this pin is ≥200mV above RXD–, RXDO will
be high; when this pin is ≥200mV below RXD–, RXDO will
be low.
TXO (Pin 15): RS562 Single-Ended Driver Output.
TXD+ (Pin 16): RS422 Differential Driver Noninverting
Output.
TXD– (Pin17):RS422DifferentialDriverInvertingOutput.
VDD (Pin 18): Positive Supply. 4.75V ≤ VDD ≤ 5.25V.
RXD– (Pin 11): RS422 Differential Receiver Inverting
Input.
TEST CIRCUITS
+
TXD
R /2
L
+
–
TXD
V
OD
+
V
500Ω
C
C
L1
L2
V
OUTPUT
UNDER TEST
DD
R
TXD
OC
L
R /2
L
C
–
L
TXD
V
LTC1320 • F03
TXD
LTC1320 • TCF02
LTC1320 • F01
SS
Figure 2
Figure 3
Figure 1
TXO
OUTPUT
UNDER TEST
OUTPUT
UNDER TEST
TXI
500Ω
V
OUTPUT
UNDER TEST
DD
C
500Ω
L
C
L
500Ω
C
L
R
L
C
L
LTC1320 • F06
LTC1320 • F07
V
LTC1320 • F04
LTC1320 • F05
SS
Figure 7
Figure 4
Figure 6
Figure 5
4
LTC1320
U
W
SWITCHI G WAVEFOR S
3V
TXI
0V
3V
TXD
0V
f = 1MHz: t < 10ns: t < 10ns
f = 1MHz: t < 10ns: t < 10ns
r
f
r
f
1.5V
1.5V
1.5V
1.5V
t
t
t
t
PHL
PHL
0V
PLH
PLH
V
TXO
OH
0V
–
LTC1320 • F11
V
TXD
OL
V
O
+
TXD
Figure 11
1/2 V
1/2 V
O
t
t
SKEW
O
SKEW
LTC1320 • F08
Figure 8
V
OH
90%
90%
10%
10%
V
OL
t
t
f
r
V
O
+
–
90%
90%
LTC1320 • F12
V
DIFF
= V(TXD ) – V(TXD )
10%
10%
–V
O
Figure 12
t
r
t
f
LTC1320 • F09
Figure 9
3V
f = 1MHz: t < 10ns: t < 10ns
r
f
RXI
0V
1.5V
1.5V
1.5V
3V
TXDEN
0V
t
t
PLH
f = 1MHz: t ≤ 10ns: t ≤ 10ns
PHL
r
f
1.5V
1.5V
V
OH
1.5V
1.5V
RXO
V
OL
t
t
t
ENL
0V
Ldis
5V
+
–
TXD , TXD
V
3V
RXI
0V
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
0.5V
f = 1MHz: t < 10ns: t < 10ns
r
f
1.5V
OL
V
OH
–
t
t
PHL
PLH
0.5V
0V
+
TXD , TXD
V
OH
–5V
1.5V
RXO
1.5V
t
LTC1320 • F10
Hdis
ENH
V
OL
LTC1320 • F13
Figure 10
Figure 13
2.5V
(RXD ) – (RXD )
–2.5V
–
+
f = 1MHz: t < 10ns: t < 10ns
r
f
0V
0V
t
t
PLH
PHL
V
OH
RXDO
1.5V
1.5V
LTC1320 • F14
V
OL
Figure 14
3V
RXEN
0V
f = 1MHz: t ≤ 10ns: t ≤ 10ns
r
f
1.5V
1.5V
t
t
Ldis
ENL
5V
RXO, RXO, RXDO
1.5V
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
0.5V
V
OL
V
OH
0.5V
1.5V
ENH
RXO, RXO, RXDO
0V
t
LTC1320 • F15
t
Hdis
Figure 15
5
LTC1320
PPLICATI
O U
W
U
A
S I FOR ATIO
Thermal Shutdown Protection
down, the supply current drops from 1.2mA to 30µA typ.
The driver outputs are three-stated and the power to the
receivers is removed. The receiver outputs are not auto-
maticallythree-statedinshutdown,andcantoggleerrone-
ously due to feedthrough from the inputs. This can be
prevented by pulling RXEN high along with SD; this will
three-state the receiver outputs and prevent the genera-
tion of spurious data.
The LTC1320 includes a thermal shutdown circuit which
protects the part against prolonged shorts at the driver
outputs. If any driver output is shorted to another output
or to the power supply, the current will be initially limited
to 450mA max. The die temperature will rise to about
150°C, at which point the thermal shutdown circuit turns
off the driver outputs. When the die cools to about 130°C,
the outputs re-enable. If the shorted condition still exists,
the part will heat again and the cycle will repeat. When the
short is removed, the part will return to normal operation.
Thisoscillationoccursatabout10Hzandpreventsthepart
from being damaged by excessive power dissipation.
Supply Bypassing
The LTC1320 requires that both VDD and VSS are well
bypassed; data errors can result from inadequate bypass-
ing. Bypass capacitor values of 0.1µF to 1µF from VDD to
groundandfromVSS togroundareadequate.Leadlengths
and trace lengths between the capacitors and the chip
should be short to minimize lead inductance.
Power Shutdown
The power shutdown feature of the LTC1320 is designed
primarily for battery-powered systems. When SD (pin 4)
is forced high, the part enters shutdown mode. In shut-
U
O
TYPICAL APPLICATI S
Single 5V Supply
RS422 to RS562/RS562 to RS422 Converter
5V
5V
0.1µF
0.1µF
18
18
1
2
3
4
17
V
DD
–
+
16
15
13
12
11
10
11 RXD
TXO 15
RXO
+
–
RS562 OUT
RXD
6
RS422 IN
10
8
NC
NC
+
RXDO
TXI
RXI 13
DRIVER I/O
+
LTC1320
LOGIC I/O
5V
5
6
7
8
2
TXD 16
LTC1320
–
RS422 OUT
12 RXI
TXD 17
RS562 IN
–
7
1
RXO
TXD
TXDEN
3
4
5
SD
+
RXEN
2µF
9
14
GND
9
V
SS
8
2
4
14
+
LTC1046
LT1054
*
5
10µF
0.1µF
–5V
LTC1320 • TA04
0.1µF
100µF
1N5817
+
3
LTC1320 • TA03
*LTC1046 GIVES 300µA QUIESCENT
CURRENT WHEN LTC1320 IS SHUT DOWN
LT1054 PROVIDES HIGHER OUTPUT DRIVE
6
LTC1320
U
O
TYPICAL APPLICATI S
Switched Negative Supply
≥25k ESD Protection
5V
5V
0.1µF
0.1µF
18
–
18
1
2
3
4
5
6
7
8
TXD
TXI
TXD 17
V
DD
–
+
1
2
3
4
5
6
7
8
TXD
TXD 17
TXD 16
*
TXDEN
SD
TXO 15
RXI 13
RXI 12
+
TXI
TXD 16
DRIVER I/O
*
LTC1320
LOGIC I/O
RXEN
RXO
TXDEN
TXO 15
–
RXD 11
*
TO OUTSIDE WORLD
PROTECTED AGAINST ESD
DAMAGE TO ±25kV
+
SD
RXI 13
RXI 12
LTC1320
RXO
RXD 10
DATA
INPUT/OUTPUT
*
*
*
*
RXDO
RXEN
RXO
RXO
RXDO
–
9
14
RXD 11
+
RXD 10
0.1µF
1N5817*
–5V
LTC1320 • TA05
GND
9
V
SS
14
*SCHOTTKY DIODE PREVENTS V FROM EXCEEDING
SS
GND ON POWER-UP OR POWER-DOWN
LTC1320 • TA06
0.1µF
–5V
*GENERAL SEMICONDUCTOR ICTE-22C OR EQUIVALENT
U
PACKAGE DESCRIPTIO
0.447 – 0.463
(11.354 – 11.760)
14 13
11
15
12
10
18 17 16
S Package
18-Lead Plastic SOL
0.394 – 0.419
(10.007 – 10.643)
SEE NOTE
2
3
5
7
8
9
1
4
6
0.291 – 0.299
(7.391 – 7.595)
0.037 – 0.045
(0.940 – 1.143)
0.093 – 0.104
(2.362 – 2.642)
0.005
(0.127)
RAD MIN
0.010 – 0.029
(0.254 – 0.737)
× 45°
0° – 8° TYP
0.050
(1.270)
TYP
0.004 – 0.012
0.009 – 0.013
(0.102 – 0.305)
(0.229 – 0.330)
SEE NOTE
0.014 – 0.019
0.016 – 0.050
(0.406 – 1.270)
(0.356 – 0.482)
TYP
NOTE:
SOL18 0392
PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS.
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of circuits as described herein will not infringe on existing patent rights.
7
LTC1320
U.S. Area Sales Offices
NORTHEAST REGION
Linear Technology Corporation
One Oxford Valley
CENTRAL REGION
Linear Technology Corporation
Chesapeake Square
NORTHWEST REGION
Linear Technology Corporation
782 Sycamore Dr.
2300 E. Lincoln Hwy.,Suite 306
Langhorne, PA 19047
Phone: (215) 757-8578
FAX: (215) 757-5631
229 Mitchell Court, Suite A-25
Addison, IL 60101
Phone: (708) 620-6910
FAX: (708) 620-6977
Milpitas, CA 95035
Phone: (408) 428-2050
FAX: (408) 432-6331
SOUTHEAST REGION
Linear Technology Corporation
17060 Dallas Parkway
Suite 208
SOUTHWEST REGION
Linear Technology Corporation
22141 Ventura Blvd.
Suite 206
Dallas, TX 75248
Phone: (214) 733-3071
FAX: (214) 380-5138
Woodland Hills, CA 91364
Phone: (818) 703-0835
FAX: (818) 703-0517
International Sales Offices
FRANCE
KOREA
TAIWAN
Linear Technology S.A.R.L.
Immeuble "Le Quartz"
58 Chemin de la Justice
92290 Chatenay Mallabry
France
Linear Technology Korea Branch
Namsong Building, #505
Itaewon-Dong 260-199
Yongsan-Ku, Seoul
Korea
Linear Technology Corporation
Rm. 801, No. 46, Sec. 2
Chung Shan N. Rd.
Taipei, Taiwan, R.O.C.
Phone: 886-2-521-7575
FAX: 886-2-562-2285
Phone: 33-1-46316161
FAX: 33-1-46314613
Phone: 82-2-792-1617
FAX: 82-2-792-1619
GERMANY
SINGAPORE
UNITED KINGDOM
Linear Techonolgy GMBH
Untere Hauptstr. 9
D-8057 Eching
Linear Technology Pte. Ltd.
101 Boon Keng Road
#02-15 Kallang Ind. Estates
Singapore 1233
Linear Technology (UK) Ltd.
The Coliseum, Riverside Way
Camberley, Surrey GU15 3YL
United Kingdom
Germany
Phone: 49-89-319741-0
FAX: 49-89-3194821
Phone: 65-293-5322
FAX: 65-292-0398
Phone: 44-276-677676
FAX: 44-276-64851
JAPAN
Linear Technology KK
5F YZ Building
4-4-12 Iidabashi Chiyoda-Ku
Tokyo, 102 Japan
Phone: 81-3-3237-7891
FAX: 81-3-3237-8010
World Headquarters
Linear Technology Corporation
1630 McCarthy Blvd.
Milpitas, CA 95035-7487
Phone: (408) 432-1900
FAX: (408) 434-0507
10/92
LT/GP 1192 10K REV 0
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
8
●
●
LINEAR TECHNOLOGY CORPORATION 1992
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
相关型号：
LTC1321CN#PBF
LTC1321 - RS232/EIA562/RS485 Transceivers; Package: PDIP; Pins: 24; Temperature Range: 0°C to 70°C
Linear
LTC1321CSW#PBF
LTC1321 - RS232/EIA562/RS485 Transceivers; Package: SO; Pins: 24; Temperature Range: 0°C to 70°C
Linear
©2020 ICPDF网 联系我们和版权申明