LINER LTC1385CS 3.3v low power eia/tia-562 transceiver Datasheet

LTC1385
3.3V Low Power
EIA/TIA-562 Transceiver
U
DESCRIPTIO
FEATURES
■
■
■
■
■
■
■
■
■
■
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 spacesaving 0.1µF capacitors.
The transceiver operates in one of three modes: Normal,
Driver Disable or Shutdown. In the Normal mode, ICC is
only 200µA in the unloaded condition. In the Driver Disable
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.
UO
APPLICATI
■
Notebook Computers
Palmtop Computers
UO
■
S
TYPICAL APPLICATI
2-Drivers/2-Receivers with Shutdown
and Driver Disable
0.1µF
LTC1385
4
LOGIC INPUT
6 VCC
15
VCC
LOGIC INPUT
LOGIC OUTPUT
LOGIC OUTPUT
0.1µF
300k
12
8
13
14
5k
10
5k
ON/OFF
562 OUTPUT
300k
11
18
9
1.2
500
1.0
562 OUTPUT
562 INPUT
562 INPUT
16
0.1µF
400
0.8
QUIESCENT
CURRENT
300
0.6
0.4
200
100
SHUTDOWN
CURRENT
0
–20
0
20
40
TEMPERATURE (°C)
60
SHUTDOWN CURRENT (µA)
0.1µF
3
7
5
600
VCC = 3.3V
QUIESCENT CURRENT (µA)
17
2
Quiescent and Shutdown Supply Current
vs Temperature
0.2
0
80
TEST CONDITION: VCC = 3.3V
1
LTC1385 • TA02
DRIVER DISABLE
LTC1385 • TA01
1
LTC1385
W W
W
AXI U
U
ABSOLUTE
RATI GS
Supply Voltage (VCC) ................................................ 5V
Input Voltage
Driver ....................................... – 0.3V to V CC + 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
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
U
W
U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
DRIVER
DISABLE
C1 +
1
20 ON/OFF
2
19 VCC
V+
3
18 GND
C1 –
4
17 TR1 OUT
C2 +
5
16 RX1 IN
C2 –
6
15 RX1 OUT
V–
7
14 TR1 IN
TR2 OUT
8
13 TR2 IN
RX2 IN
9
12 RX2 OUT
NC 10
ORDER PART
NUMBER
LTC1385CG
11 NC
ORDER PART
NUMBER
TOP VIEW
DRIVER
DISABLE 1
C1+ 2
18 ON/OFF
17 VCC
V+ 3
C1–
LTC1385CN
LTC1385CS
16 GND
15 TR1 OUT
4
C2+ 5
14 RX1 IN
C2 – 6
13 RX1 OUT
V– 7
12 TR1 IN
TR2 OUT 8
11 TR2 IN
10 RX2 OUT
RX2 IN 9
N PACKAGE
S PACKAGE
18-LEAD PLASTIC DIP 18-LEAD PLASTIC SOL
G PACKAGE
20-LEAD SSOP
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
Any Driver
Output Voltage Swing
3k to GND
Logic Input Voltage Level
Logic Input Current
Output Short-Circuit Current
Output Leakage Current
2
MIN
TYP
4.5
– 4.5
1.4
1.4
Positive
Negative
●
●
3.7
– 3.7
Input Low Level (VOUT = High)
Input High Level (VOUT = Low)
VIN = VCC
VIN = 0V
VOUT = 0V
Shutdown or Driver Disable or VCC = 0V (Note 3,4),
VOUT = ±20V
●
●
2.0
●
●
●
– 20
±10
±10
MAX
0.8
5
– 40
±500
UNITS
V
V
V
V
µA
µA
mA
µA
LTC1385
DC ELECTRICAL CHARACTERISTICS
VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1µF, VON/OFF = VCC, Driver Disable = VCC, unless otherwise noted.
PARAMETER
Any Receiver
Input Voltage Thresholds
Hysteresis
Input Resistance
Output Voltage
Output Short-Circuit Current
Output Leakage Current
Power Supply Generator
V + Output Voltage
V – Output Voltage
Supply Rise Time
Power Supply
VCC Supply Current
Supply Leakage Current (VCC)
CONDITIONS
Input Low Threshold
Input High Threshold
– 10V ≤ VIN ≤ 10V
Output Low, IOUT = – 1.6mA (VCC = 3.3V)
Output High, IOUT = 160µA (VCC = 3.3V)
Sinking Current, VOUT = VCC
Sourcing Current, VOUT = 0V
Shutdown (Note 4), 0V ≤ VOUT ≤ VCC
No Load (Note 2)
Shutdown (Note 4)
Driver Disable (Note 3)
AC CHARACTERISTICS
Driver Propagation Delay
(TTL to EIA / TIA-562)
Receiver Propagation Delay
(EIA / TIA-562 to TTL)
TYP
●
●
0.8
●
0.1
3
1.3
1.7
0.4
5
0.2
3.2
– 20
7
1
●
●
3.0
–5
2
●
IOUT = 0mA
IOUT = 5mA
IOUT = 0mA
IOUT = – 5mA
Shutdown or Driver Disable to Turn-On
Digital Input Threshold Low
Digital Input Threshold High
PARAMETER
Slew Rate
MIN
MAX
2.4
1.0
7
0.4
10
5.7
5.5
– 5.3
– 5.0
0.2
●
●
●
●
●
2.0
UNITS
V
V
V
kΩ
V
V
mA
mA
µA
V
V
V
V
ms
0.2
0.2
35
1.4
1.4
0.5
10
50
0.8
mA
µA
µA
V
V
TYP
8
5
2
2
0.3
0.2
MAX
30
UNITS
V/µs
V/µs
µs
µs
µs
µs
VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
CONDITIONS
RL = 3k, CL = 51pF
RL = 3k, CL = 1000pF
t HLD (Figure 1)
t LHD (Figure 1)
t HLR (Figure 2)
t LHR (Figure 2)
The ● denotes specifications which apply over the operating temperature
range 0°C ≤ TA ≤ 70°C.
Note 1: Absolute maximum ratings are those values beyond which the life
of the device may be impaired.
Note 2: Supply current is measured with driver and receiver outputs
unloaded.
MIN
3
●
●
●
●
3.5
3.5
0.8
0.8
Note 3: Measurements made in the Driver Disable mode are performed
with VDRIVER DISABLE = GND and VON/OFF = VCC.
Note 4: Measurements made in the Shutdown mode are performed with
VON/OFF = 0V.
3
LTC1385
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Driver Output Voltage
vs Temperature
Receiver Input Thresholds
vs Temperature
5
OUTPUT HIGH
VCC = 3.3V
2
1
ALL DRIVERS WITH LOAD
RL = 3k
0
–1
–2
OUTPUT LOW
VCC = 3.3V
–3
–4
1.8
VTH+
1.6
1.4
VTH–
40
30
20
50
TEMPERATURE (°C)
60
70
0
10
40
30
50
20
TEMPERATURE (˚C)
60
LTC1385 • TPC01
5
70
0
Driver Leakage in Shutdown
vs Temperature
18
40
16
LEAKAGE CURRENT (µA)
2.5
1 DRIVER LOADED
RL = 3k
2.0
1.5
1.0
35
30
25
VOUT = –20V
20
15
10
VOUT = 20V
5
0.5
SHORT-CIRCUIT CURRENT (mA)
45
3.0
0
10
20
30
50
40
TEMPERATURE (°C)
60
0
70
10
30
20
40
50
TEMPERATURE (°C)
Receiver Short-Circuit Current
vs Temperature
60
70
40
35
30
ISC+
6
4
0
0
10
50
30
40
20
TEMPERATURE (°C)
60
70
LTC1385 • TPC06
INPUT
15
INPUT
ISC+
10
LTC1385 • TPC08
5
0
0
10
50
30
40
20
TEMPERATURE (°C)
60
70
LTC1385 • TPC06
4
8
RECEIVER
OUTPUT
CL = 51pF
DRIVER
OUTPUT
RL = 3k
ISC–
ISC–
Receiver Output Waveform
DRIVER
OUTPUT
RL = 3k
CL = 1000pF
20
12
10
Driver Output Waveforms
45
25
14
LTC1385 • TPC05
LTC1385 • TPC04
140
2
0
0
120
Driver Short-Circuit Current
vs Temperature
4.0
2 DRIVERS LOADED
RL = 3k
80 100
60
DATA RATE (kBAUD)
40
LTC1385 • TPC03
4.5
3.5
20
LTC1385 • TPC02
VCC Supply Current
vs Temperature
SUPPLY CURRENT (mA)
10
0
1.0
10
15
1.2
–5
0
VCC = 3.3V
RL = 3k
CL = 2500pF
ALL DRIVERS ACTIVE
2.0
SUPPLY CURRENT (mA)
3
THRESHOLD VOLTAGE (V)
DRIVER OUTPUT VOLTAGE (V)
4
SHORT-CIRCUIT CURRENT (mA)
Supply Current vs Data Rate
20
2.2
LTC1385 • TPC09
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.
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.
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 the driver outputs forced into three-state. Both receivers 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.
V –: Negative Supply Output (EIA/TIA-562 Drivers).
V – ≅ – (2VCC – 1.3V). This pin requires an external
capacitor C = 0.1µF for charge storage.
C1+, C1–, C2+, C2 –: Commutating Capacitor Inputs. 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.
TR IN: EIA/TIA-562 Driver Input Pins. Inputs are TTL/
CMOS compatible. The inputs of unused drivers can be left
unconnected since 300k input pull-up resistors to VCC are
included on chip. To minimize power consumption, the
internal driver pull-up resistors are disconnected from VCC
in the Shutdown mode.
TR OUT: Driver Outputs at EIA/TIA-562 Voltage Levels.
Outputs are in a high impedance state when in the Shutdown 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
without damage. The receiver inputs are protected against
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 Levels. Outputs are in a high impedance state when in the
Shutdown mode.
U
W
W
SWITCHI G TI E WAVEFOR S
DRIVER
INPUT
VCC
1.4V
1.4V
0V
V+
DRIVER
OUTPUT
0V
0V
t LHD
V
–
t HLD
VCC
1.7V
RX
INPUT
RX
OUTPUT
1.3V
0V
2.4V
0.8V
t LHR
t HLR
0V
1385 F02
1385 F01
Figure 1. Driver Propagation Delay Timing
VCC
Figure 2. Receiver Propagation Delay Timing
5
LTC1385
TEST CIRCUITS
Driver Timing Test Load
DRIVER
INPUT
Receiver Timing Test Load
RX
OUTPUT
DRIVER
OUTPUT
RX INPUT
DRIVER
51pF
RX
51pF
3k
1385 F04
1385 F03
ESD Test Circuit
17
2
0.1µF
LTC1385
4
LOGIC INPUT
6 VCC
LOGIC OUTPUT
LOGIC OUTPUT
0.1µF
300k
15
12
VCC
LOGIC INPUT
0.1µF
562 OUTPUT
300k
11
8
13
14
5k
10
5k
ON/OFF
VCC
7
5
0.1µF
3
18
9
562 OUTPUT
562 INPUT
RS562
LINE PINS
PROTECTED
TO ±10kV
562 INPUT
16
1
DRIVER DISABLE
6
1385 F05
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)
1 2 3 4 5 6 7 8 9 10
0.045
(1.14)
0.205 – 0.212*
(5.20 – 5.38)
0.068 – 0.078
(1.73 – 1.99)
0° – 8°
0.005 – 0.009
(0.13 – 0.22)
0.0256
(0.65)
BSC
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
1
2
3
4
5
6
7
8
9
0.260 ± 0.010
(6.604 ± 0.254)
0.300 – 0.325
(7.620 – 8.255)
0.009 – 0.015
(0.229 – 0.381)
(
+0.025
0.325 –0.015
8.255
+0.635
–0.381
)
0.130 ± 0.005
(3.302 ± 0.127)
0.045 – 0.065
(1.143 – 1.651)
0.015
(0.381)
MIN
0.065
(1.651)
TYP
0.125
(3.175)
MIN
0.045 ± 0.015
(1.143 ± 0.381)
0.100 ± 0.010
(2.540 ± 0.254)
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
0.018 ± 0.003
(0.457 ± 0.076)
N18 0392
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)
18
17
16
15
14
13
12
11
10
0.394 – 0.419
(10.007 – 10.643)
SEE NOTE
0.005
(0.127)
RAD MIN
1
0.291 – 0.299
(7.391 – 7.595)
(NOTE 2)
0.010 – 0.029 × 45°
(0.254 – 0.737)
2
3
0.093 – 0.104
(2.362 – 2.642)
4
5
6
7
8
9
0.037 – 0.045
(0.940 – 1.143)
0° – 8° TYP
0.009 – 0.013
(0.229 – 0.330)
NOTE 1
0.016 – 0.050
(0.406 – 1.270)
0.050
(1.270)
TYP
0.004 – 0.012
(0.102 – 0.305)
0.014 – 0.019
(0.356 – 0.482)
TYP
NOTE:
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).
8
Linear Technology Corporation
SOL18 0392
LT/GP 0594 10K • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 ● FAX: (408) 434-0507 ● TELEX: 499-3977
 LINEAR TECHNOLOGY CORPORATION 1994
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