LTC1385CG [Linear]
3.3V Low Power EIA/TIA-562 Transceiver; 3.3V低功耗EIA / TIA- 562收发器
| 型号： | LTC1385CG |
| 厂家： | 
Linear |
| 描述： | 3.3V Low Power EIA/TIA-562 Transceiver |
| 文件： | 总8页 (文件大小：218K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1385
3.3V Low Power
EIA/TIA-562 Transceiver
U
DESCRIPTIO
EATURE
S
F
■
■
■
■
■
■
■
■
Operates from a Single 3.3V Supply
Low Supply Current: ICC = 200µA
ICC = 35µA in Driver Disable Mode
ICC = 0.2µA in Shutdown Mode
ESD Protection Over ±10kV
Uses Small Capacitors: 0.1µF
Operates to 120kBaud
Output Overvoltage Does Not Force Current
Back into Supplies
EIA/TIA-562 I/O Lines Can Be Forced to ±25V
Without Damage
Pin Compatible with LT1180A
The LTC1385 is an ultra-low power, 2-driver/2-receiver
EIA/TIA-562 transceiver which operates from a single
3.3V supply. The charge pump requires only four space-
saving 0.1µF capacitors.
The transceiver operates in one of three modes: Normal,
Driver Disable or Shutdown. In the Normal mode, ICC is
only200µAintheunloadedcondition.IntheDriverDisable
mode, the charge pump is turned off, the driver outputs
are forced into three-state, both receivers are kept active,
and ICC drops to 35µA. In the Shutdown mode, everything
is turned off and ICC drops to 0.2µA.
■
■
The LTC1385 is fully compliant with all data rate and
overvoltage EIA/TIA-562 specifications. The transceiver
can operate up to 120kbaud with a 1000pF, 3kΩ load.
Both driver outputs and receiver inputs can be forced to
±25V without damage, and can survive multiple ±10kV
ESD strikes.
O U
PPLICATI
S
A
■
Notebook Computers
Palmtop Computers
■
U
O
TYPICAL APPLICATI
2-Drivers/2-Receivers with Shutdown
and Driver Disable
Quiescent and Shutdown Supply Current
vs Temperature
1.2
1.0
0.8
0.6
0.4
0.2
0
600
500
400
300
200
100
0
17
3
2
4
5
6
V
= 3.3V
CC
LTC1385
0.1µF
7
0.1µF
V
V
CC
0.1µF
0.1µF
300k
12
15
LOGIC INPUT
562 OUTPUT
QUIESCENT
CURRENT
CC
300k
11
13
8
562 OUTPUT
562 INPUT
LOGIC INPUT
14
LOGIC OUTPUT
SHUTDOWN
CURRENT
5k
5k
10
18
9
562 INPUT
LOGIC OUTPUT
ON/OFF
–20
0
20
40
60
80
16
TEMPERATURE (°C)
TEST CONDITION: V = 3.3V
CC
1
LTC1385 • TA02
LTC1385 • TA01
DRIVER DISABLE
1
LTC1385
W W W
U
ABSOLUTE AXI U RATI GS
Supply Voltage (VCC) ................................................ 5V
Input Voltage
Short-Circuit Duration
V+ ................................................................... 30 sec
V– ................................................................... 30 sec
Driver Output.............................................. Indefinite
Receiver Output.......................................... Indefinite
Operating Temperature Range .................... 0°C to 70°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
Driver ....................................... –0.3V to VCC + 0.3V
Receiver ............................................... – 25V to 25V
Digital Input............................... –0.3V to VCC + 0.3V
Output Voltage
Driver .................................................... – 25V to 25V
Receiver .................................... – 0.3V to VCC + 0.3V
W
U
/O
PACKAGE RDER I FOR ATIO
TOP VIEW
ORDER PART
NUMBER
ORDER PART
TOP VIEW
NUMBER
DRIVER
DRIVER
1
2
3
4
5
6
7
8
9
ON/OFF
VCC
20
19
18
17
16
15
14
13
12
11
DISABLE
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
ON/OFF
+
DISABLE
C1
+
C1
V
CC
+
V
GND
+
LTC1385CN
LTC1385CS
LTC1385CG
V
GND
–
C1
TR1 OUT
RX1 IN
RX1 OUT
TR1 IN
TR2 IN
RX2 OUT
NC
–
C1
TR1 OUT
RX1 IN
RX1 OUT
TR1 IN
TR2 IN
RX2 OUT
+
C2
+
C2
–
C2
–
C2
–
V
–
V
TR2 OUT
RX2 IN
TR2 OUT
RX2 IN
NC 10
N PACKAGE
S PACKAGE
G PACKAGE
20-LEAD SSOP
18-LEAD PLASTIC DIP 18-LEAD PLASTIC SOL
TJMAX = 125°C, θJA = 85°C/W
TJMAX = 125°C, θJA = 135°C/W
Consult factory for Industrial and Military grade parts.
DC ELECTRICAL CHARACTERISTICS
VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1µF, VON/OFF = VCC, Driver Disable = VCC, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Any Driver
Output Voltage Swing
3k to GND
Positive
Negative
●
●
3.7
–3.7
4.5
– 4.5
V
V
Logic Input Voltage Level
Logic Input Current
Input Low Level (V
Input High Level (V
= High)
= Low)
●
●
1.4
1.4
0.8
V
V
µA
µA
mA
µA
OUT
2.0
OUT
V
IN
V
IN
= V
= 0V
●
●
5
–40
CC
–20
±10
±10
Output Short-Circuit Current
Output Leakage Current
V
OUT
= 0V
Shutdown or Driver Disable or V = 0V (Note 3,4),
●
±500
CC
V
OUT
= ±20V
2
LTC1385
DC ELECTRICAL CHARACTERISTICS
VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1µF, VON/OFF = VCC, Driver Disable = VCC, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Any Receiver
Input Voltage Thresholds
Input Low Threshold
Input High Threshold
●
●
0.8
1.3
1.7
0.4
5
0.2
3.2
V
V
V
kΩ
V
V
2.4
1.0
7
Hysteresis
Input Resistance
Output Voltage
●
0.1
3
–10V ≤ V ≤ 10V
IN
Output Low, I
Output High, I
= – 1.6mA (V = 3.3V)
= 160µA (V = 3.3V)
●
●
0.4
OUT
CC
3.0
OUT
CC
Output Short-Circuit Current
Sinking Current, V
Sourcing Current, V
= V
–5
2
–20
7
mA
mA
OUT
CC
= 0V
OUT
Output Leakage Current
Shutdown (Note 4), 0V ≤ V
≤ V
●
1
10
µA
OUT
CC
Power Supply Generator
+
V Output Voltage
I
I
I
I
= 0mA
= 5mA
= 0mA
5.7
5.5
–5.3
–5.0
V
V
V
V
OUT
OUT
–
V Output Voltage
OUT
OUT
= –5mA
Supply Rise Time
Shutdown or Driver Disable to Turn-On
0.2
ms
Power Supply
V
CC
Supply Current
No Load (Note 2)
●
0.2
0.5
mA
Supply Leakage Current (V
)
Shutdown (Note 4)
Driver Disable (Note 3)
●
●
0.2
35
10
50
µA
µA
CC
Digital Input Threshold Low
Digital Input Threshold High
●
●
1.4
1.4
0.8
V
V
2.0
AC CHARACTERISTICS
VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
PARAMETER
CONDITIONS
R = 3k, C = 51pF
MIN
TYP
8
5
MAX
30
UNITS
V/µs
V/µs
Slew Rate
L
L
R = 3k, C = 1000pF
3
L
L
Driver Propagation Delay
(TTL to EIA/TIA-562)
t
t
(Figure 1)
(Figure 1)
●
●
2
2
3.5
3.5
µs
µs
HLD
LHD
Receiver Propagation Delay
(EIA/TIA-562 to TTL)
t
t
(Figure 2)
(Figure 2)
●
●
0.3
0.2
0.8
0.8
µs
µs
HLR
LHR
The
●
denotes specifications which apply over the operating temperature
Note 3: Measurements made in the Driver Disable mode are performed
with V = GND and V = V
range 0°C ≤ T ≤ 70°C.
.
CC
A
DRIVER DISABLE
ON/OFF
Note 1: Absolute maximum ratings are those values beyond which the life
of the device may be impaired.
Note 4: Measurements made in the Shutdown mode are performed with
V = 0V.
ON/OFF
Note 2: Supply current is measured with driver and receiver outputs
unloaded.
3
LTC1385
TYPICAL PERFORMANCE CHARACTERISTICS
W
U
Driver Output Voltage
vs Temperature
Receiver Input Thresholds
vs Temperature
Supply Current vs Data Rate
5
4
2.2
2.0
1.8
1.6
20
15
V
= 3.3V
CC
OUTPUT HIGH
R
= 3k
L
L
V
CC
= 3.3V
C
= 2500pF
3
ALL DRIVERS ACTIVE
2
+
1
V
V
TH
ALL DRIVERS WITH LOAD
= 3k
0
10
5
R
L
–1
–2
–3
–4
–5
1.4
1.2
1.0
–
TH
OUTPUT LOW
V
CC
= 3.3V
0
0
20
30
40
50
60
70
0
10
20
30
40
50
60
70
0
20
40
60
80 100 120 140
10
TEMPERATURE (°C)
TEMPERATURE (˚C)
DATA RATE (kBAUD)
LTC1385 • TPC01
LTC1385 • TPC02
LTC1385 • TPC03
VCC Supply Current
vs Temperature
Driver Leakage in Shutdown
vs Temperature
Driver Short-Circuit Current
vs Temperature
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
45
40
35
30
25
20
15
10
5
18
16
14
12
10
8
2 DRIVERS LOADED
= 3k
R
L
–
I
I
SC
V
= –20V
OUT
1 DRIVER LOADED
+
R
L
= 3k
SC
6
4
V
= 20V
50
OUT
40
2
0
0
0
30
0
10
20
60
70
0
10
20
30
70
0
10
30
40
50
70
40
50
60
20
60
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
LTC1385 • TPC05
LTC1385 • TPC04
LTC1385 • TPC06
Receiver Short-Circuit Current
vs Temperature
Driver Output Waveforms
Receiver Output Waveform
45
40
35
30
25
20
15
10
5
DRIVER
OUTPUT
R
L = 3k
RECEIVER
OUTPUT
CL = 1000pF
C
L = 51pF
DRIVER
OUTPUT
R
L = 3k
–
I
I
SC
INPUT
INPUT
+
SC
LTC1385 • TPC08
LTC1385 • TPC09
0
0
10
30
40
50
70
20
60
TEMPERATURE (°C)
LTC1385 • TPC06
4
LTC1385
U
U
U
PI FU CTIO S
VCC: 3.3V Input Supply Pin. This pin should be decoupled
with a 0.1µF ceramic capacitor.
C1+,C1–,C2+,C2–:CommutatingCapacitorInputs.These
pins require two external capacitors C = 0.1µF: one from
C1+ to C1–, and another from C2+ to C2–. To maintain
charge pump efficiency, the capacitor’s effective series
resistance should be less than 2Ω.
GND: Ground Pin.
ON/OFF: TTL/CMOS Compatible Shutdown Pin. A logic
low puts the device in the Shutdown mode independent
of the Driver Disable pin. The supply current drops to
0.2µA and all driver and receiver outputs are forced into
three-state.
TR IN: EIA/TIA-562 Driver Input Pins. Inputs are TTL/
CMOScompatible.Theinputsofunuseddriverscanbeleft
unconnected since 300k input pull-up resistors to VCC are
included on chip. To minimize power consumption, the
internaldriverpull-upresistorsaredisconnectedfromVCC
in the Shutdown mode.
DRIVER DISABLE: TTL/CMOS Compatible Input Pin. With
the ON/OFF pin held high, a logic low forces the part into
the Driver Disable mode with the charge pump turned off
and thedriver outputsforcedintothree-state. Both receiv-
ers remain active and the supply current drops to 35µA. A
logic high forces the part into the Normal mode.
V+: Positive Supply Output (EIA/TIA-562 Drivers).
V+ 2VCC – 1V. This pin requires an external capacitor
C = 0.1µF for charge storage. The capacitor may be tied
to ground or VCC. With multiple devices, the V + and V–
pins may share a common capacitor. For a large number
of devices, increasing the size of the shared common
storage capacitors is recommended to reduce ripple.
TR OUT: Driver Outputs at EIA/TIA-562 Voltage Levels.
Outputs are in a high impedance state when in the Shut-
down or Driver Disable mode or VCC = 0V. The driver
outputs are protected against ESD to ±10kV for human
body model discharges.
RX IN: Receiver Inputs. These pins can be forced to ±25V
withoutdamage. Thereceiverinputsareprotectedagainst
ESD to ±10kV for human body model discharges. Each
receiver provides 0.4V of hysteresis for noise immunity.
RX OUT: Receiver Outputs with TTL/CMOS Voltage Lev-
els. Outputs are in a high impedance state when in the
Shutdown mode.
V–: Negative Supply Output (EIA/TIA-562 Drivers).
V – –(2VCC – 1.3V). This pin requires an external
capacitor C = 0.1µF for charge storage.
U
W
W
SWITCHI G TI E WAVEFOR S
V
V
CC
CC
1.7V
RX
INPUT
DRIVER
INPUT
1.3V
1.4V
1.4V
0V
0V
+
V
V
CC
RX
OUTPUT
DRIVER
OUTPUT
2.4V
0V
0V
0.8V
–
V
0V
t
t
t
HLR
LHR
t
LHD
HLD
1385 F02
1385 F01
Figure 1. Driver Propagation Delay Timing
Figure 2. Receiver Propagation Delay Timing
5
LTC1385
TEST CIRCUITS
Driver Timing Test Load
Receiver Timing Test Load
RX
OUTPUT
DRIVER
OUTPUT
DRIVER
INPUT
RX INPUT
RX
DRIVER
51pF
51pF
3k
1385 F04
1385 F03
ESD Test Circuit
17
3
2
4
5
6
V
CC
LTC1385
0.1µF
7
0.1µF
V
CC
CC
0.1µF
0.1µF
300k
300k
12
15
LOGIC INPUT
562 OUTPUT
V
RS562
LINE PINS
PROTECTED
TO ±10kV
11
13
8
562 OUTPUT
562 INPUT
LOGIC INPUT
14
LOGIC OUTPUT
LOGIC OUTPUT
5k
5k
10
18
9
562 INPUT
16
ON/OFF
1
1385 F05
DRIVER DISABLE
6
LTC1385
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
G Package
20-Lead SSOP
0.278 – 0.289*
(7.07 – 7.33)
20 19 18 17 16 15 14 13 12 11
0.301 – 0.311
(7.65 – 7.90)
0.045
(1.14)
5
7
8
1
2
3
4
6
9 10
0.045
(1.14)
0.205 – 0.212*
(5.20 – 5.38)
0.068 – 0.078
(1.73 – 1.99)
0° – 8°
0.0256
(0.65)
BSC
0.005 – 0.009
(0.13 – 0.22)
0.022 – 0.037
(0.55 – 0.95)
0.002 – 0.008
(0.05 – 0.21)
0.010 – 0.015
(0.25 – 0.38)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
20SSOP 0294
N Package
18-Lead Plastic DIP
0.905
(22.860)
MAX
18
17
16
15
14
13
12
11
10
0.260 ± 0.010
(6.604 ± 0.254)
1
2
3
5
6
9
4
7
8
0.300 – 0.325
0.130 ± 0.005
0.045 – 0.065
(7.620 – 8.255)
(3.302 ± 0.127)
(1.143 – 1.651)
0.015
(0.381)
MIN
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
+0.025
–0.015
0.325
0.125
(3.175)
MIN
0.045 ± 0.015
(1.143 ± 0.381)
0.018 ± 0.003
(0.457 ± 0.076)
+0.635
8.255
(
)
–0.381
0.100 ± 0.010
(2.540 ± 0.254)
N18 0392
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However,noresponsibilityisassumedforitsuse.LinearTechnologyCorporationmakesnorepresenta-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
7
LTC1385
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
S Package
18-Lead Plastic SOL
0.447 – 0.463
(11.354 – 11.760)
(NOTE 2)
14 13
11
15
12
10
18 17 16
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)
(NOTE 2)
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
× 45°
(0.254 – 0.737)
0° – 8° TYP
0.050
(1.270)
TYP
0.004 – 0.012
(0.102 – 0.305)
0.009 – 0.013
(0.229 – 0.330)
NOTE 1
0.014 – 0.019
0.016 – 0.050
(0.356 – 0.482)
TYP
(0.406 – 1.270)
NOTE:
SOL18 0392
1. 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.
2. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
LT/GP 0594 10K • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
8
●
●
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
LINEAR TECHNOLOGY CORPORATION 1994
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