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LTC1327
1
3.3V Micropower EIA/TIA-562
Transceiver
U
S
A
O
PPLICATI
s
Notebook Computers
s
Palmtop Computers
U
A
O
PPLICATI
TYPICAL
3-Drivers/5-Receivers with SHUTDOWN
D
U
ESCRIPTIO
S
FEATURE
s
Low Supply Current
300
µ
A
s
0.2
µ
A Supply Current in SHUTDOWN
s
ESD Protection
±
10kV
s
Operates From a Single 3.3V Supply
s
Uses Small Capacitors
0.1
µ
F
s
Operates To 120k Baud
s
Three-State Outputs are High Impedance When Off
s
Output Overvoltage Does Not Force Current Back
Into Supplies
s
EIA/TIA-562 I/O Lines Can Be Forced to
±
25V
Without Damage
s
Flowthrough Architecture
The LTC1327 is an advanced low power, three-driver/five-
receiver EIA/TIA-562 transceiver. In the no load condition,
the supply current is only 300
µ
A. The charge pump only
requires four 0.1
µ
F capacitors.
In SHUTDOWN mode, the supply current is further re-
duced to 0.2
µ
A. All EIA/TIA-562 outputs assume a high
impedance state in SHUTDOWN and with the power off.
The LTC1327 is fully compliant with all data rate and
overvoltage EIA/TIA-562 specifications. The transceiver
can operate up to 120k Baud with a 1000pF//3k
load.
Both driver outputs and receiver inputs can be forced to
±
25V without damage, and can survive multiple
±
10kV
ESD strikes.
Supply Current vs Temperature
TEMPERATURE (°C)
20
0
QUIESCENT CURRENT (
µ
A)
100
200
300
400
600
0
20
40
60
LTC1327 · TA02
80
500
SHUTDOWN CURRENT (
µ
A)
0.2
0.4
0.6
0.8
1.2
1.0
V
CC
= 3.3V
ALL DRIVERS INPUTS TIED TO V
CC
QUIESCENT
CURRENT
SHUTDOWN
CURRENT
1327 TA01
V
CC
C1
0.1
µ
F
LTC1327
1
2
3
4
5
6
7
8
9
10
11
12
13
14
DR1 OUT
RX1 IN
DR2 OUT
RX2 IN
RX3 IN
RX4 IN
DR4 OUT
RX5 IN
ON/OFF
28
27
26
25
24
23
22
21
20
19
18
17
16
15
C3
0.1
µ
F
DR1 IN
RX1 OUT
DR2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DR3 IN
RX5 OUT
V
V
+
C2
0.1
µ
F
C4
0.1
µ
F
GND
2
LTC1327
Supply Voltage (V
CC
) ................................................. 5V
Input Voltage
Driver ...................................... 0.3V to (V
CC
+ 0.3V)
Receiver ................................................ 25V to 25V
On/Off Pin ............................... 0.3V to (V
CC
+ 0.3V)
Output Voltage
Driver .................................................... 25V to 25V
Receiver ................................. 0.3V to (V
CC
+ 0.3V)
Short-Circuit Duration
V
+ ...................................................................................
30 sec
V
...................................................................................
30 sec
Driver Output ............................................. Indefinite
Receiver Output ......................................... Indefinite
Operating Temperature Range
Commercial LTC1327C .......................... 0
°
C to 70
°
C
Storage Temperature Range ................. 65
°
c to 150
°
C
Lead Temperature (Soldering, 10 sec)................. 300
°
C
PACKAGE/ORDER I FOR ATIO
U
W
U
ABSOLUTE AXI U RATI GS
W
U
W W
LTC1327CG
LTC1327CN
LTC1327CS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
V
+
V
CC
C1
+
C1
DR1 OUT
RX1 IN
DR2 OUT
RX2 IN
RX3 IN
RX4 IN
DR3 OUT
RX5 IN
ON/OFF
NC
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
C2
+
C2
DR1 IN
RX1 OUT
DR2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DR3 IN
RX5 OUT
GND
NC
NC
N PACKAGE
28-LEAD PLASTIC DIP
TOP VIEW
S PACKAGE
28-LEAD PLASTIC SOL
G PACKAGE
28-LEAD SSOP
T
JMAX
= 125
°
C,
JA
= 96
°
C/ W (G)
T
JMAX
= 125
°
C,
JA
= 56
°
C/ W (N)
T
JMAX
= 125
°
C,
JA
= 85
°
C/ W (S)
ORDER PART
NUMBER
Consult factory for Industrial and Military grade parts.
V
CC
= 3.3V, C1 to C4 = 0.1
µ
F, unless otherwise noted.
ELECTRICAL C
C
HARA TERISTICS
C
D
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Any Driver
Output Voltage Swing
Positive
q
3.7
4.5
V
Negative (3k to GND)
q
3.7
4.5
V
Logic Input Voltage Level
Input Low Level (V
OUT
= High)
q
1.4
0.8
V
Input High Level (V
OUT
= Low)
q
2
1.4
V
Logic Input Current
V
IN
= 3.3
q
5
µ
A
V
IN
= 0
q
5
µ
A
Output Short-Circuit Current
V
OUT
= 0V
±
7
mA
Output Leakage Current
SHUTDOWN (Note 3), V
OUT
=
±
20V
±
10
±
500
µ
A
Any Receiver
Input Voltage Thresholds
Input Low Threshold
q
0.8
1.3
V
Input High Threshold
q
1.7
2.4
V
Hysteresis
q
0.1
0.4
1
V
Input Resistance
V
IN
=
±
10V
3
5
7
k
Output Voltage
Output Low, I
OUT
= 1.6mA (V
CC
= 3.3V)
q
0.2
0.4
V
Output High, I
OUT
= 160
µ
A (V
CC
= 3.3V)
q
3
3.2
V
Output Short-Circuit Current
Sinking Current, V
OUT
= V
CC
2
10
mA
Output Leakage Current
SHUTDOWN (Note 3), 0
V
OUT
V
CC
q
1
10
µ
A
LTC1327
3
ELECTRICAL C
C
HARA TERISTICS
C
D
V
CC
= 3.3V, C1 to C4 = 0.1
µ
F, unless otherwise noted.
C
C
HARA TERISTICS
AC
The
q
denotes specifications which apply over the operating temperature
(0
°
C
T
A
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 output
unloaded and driver inputs tied high.
Note 3: Supply current measurement in SHUTDOWN mode is performed
with V
ON/OFF
= 0V.
C
C
HARA TERISTICS
U
W
A
TYPICAL PERFOR
CE
DATA RATE (k BAUD)
0
SUPPLY CURRENT (mA)
45
40
35
30
25
20
15
10
5
0
1327 G03
40
20
60
80
120
100
140
V
CC
= 3.3V
R
L
= 3k
C
L
= 1000pF
3 DRIVERS ACTIVE
Driver Output Voltage vs
Temperature
Supply Current vs Data Rate
TEMPERATURE (°C)
0
THRESHOLD VOLTAGE (V)
2.2
2.0
1.8
1.6
1.4
1.2
1.0
30
50
V
TH
+
V
TH
1327 G02
10
20
40
60
70
Receiver Input Thresholds vs
Temperature
TEMPERATURE (°C)
0
DRIVER OUTPUT VOLTAGE (V)
5
4
3
2
1
0
1
2
3
4
5
20
40
50
1327 G01
10
30
60
70
V
CC
= 3.3V
OUTPUT HIGH
V
CC
= 3.3V
OUTPUT LOW
ALL DRIVERS WITH LOAD R
L
= 3k
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Power Supply Generator
V
+
Output Voltage
I
OUT
= 0mA
5.7
V
I
OUT
= 5mA
5.5
V
V
Output Voltage
I
OUT
= 0mA
5.3
V
I
OUT
= 5mA
5.0
V
Supply Rise Time
SHUTDOWN to Turn-On
0.2
ms
Power Supply
V
CC
Supply Current
No Load (Note 2)
q
0.3
0.5
mA
Supply Leakage Current (V
CC
)
SHUTDOWN (Note 3)
q
0.2
10
µ
A
On/Off Threshold Low
q
1.4
0.8
V
On/Off Threshold High
q
2
1.4
V
Slew Rate
R
L
= 3k, C
L
= 51pF
6
30
V/
µ
s
R
L
= 3k, C
L
= 1000pF
3
5
V/
µ
s
Driver Propagation Delay
t
HLD
q
2
3.5
µ
s
(TTL to EIA/TIA-562)
t
LHD
q
2
3.5
µ
s
Receiver Propagation Delay
t
HLR
q
0.3
0.8
µ
s
(EIA/TIA-562 to TTL)
t
LHR
q
0.2
0.8
µ
s
4
LTC1327
SUPPLY VOLTAGE (V)
0
14
12
10
8
6
4
2
0
30
50
1327 G06
10
20
40
60
70
SHORT-CIRCUIT CURRENT (mA)
I
SC
I
SC
+
DATA RATE (k BAUD)
0
SUPPLY CURRENT (mA)
45
40
35
30
25
20
15
10
5
0
1327 G03
40
20
60
80
120
100
140
V
CC
= 3.3V
R
L
= 3k
C
L
= 1000pF
3 DRIVERS ACTIVE
V
CC
Supply Current vs Data Rate
C
C
HARA TERISTICS
U
W
A
TYPICAL PERFOR
CE
TEMPERATURE (°C)
0
LEAKAGE CURRENT (
µ
A)
60
45
40
35
30
25
20
15
10
5
0
1327 G05
20
70
10
30
40
50
V
OUT
= 20V
V
OUT
= 20V
Driver Leakage in SHUTDOWN
vs Temperature
Driver Short-Circuit Current vs
Supply Voltage
PI FU CTIO S
U
U
U
V
CC
: 3.3V Input Supply Pin. Supply current 0.2
µ
A in the
SHUTDOWN mode. This pin should be decoupled with a
0.1
µ
F ceramic capacitor.
GND: Ground Pin.
ON/OFF: TTL/CMOS Compatible Shutdown Pin. A logic
low puts the device in SHUTDOWN mode which reduces
the supply current to 0.2
µ
A and places all drivers and
receivers in high impedance state. This pin cannot float.
V
+
: Positive Supply Output (EIA/TIA-562 Drivers).
V
+
2V
CC
1V. This pin requires an external capacitor
C = 0.1
µ
F for charge storage. The capacitor may be tied to
ground or 3.3V. With multiple devices, the V
+
and V
pins
may be paralleled into common capacitors. For large
numbers 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
(2V
CC
1.3). This pin requires an external capacitor
C = 0.1
µ
F for a charge storage.
DRIVER
OUTPUT
R
L
= 3k
DRIVER
OUTPUT
R
L
= 3k
C
L
= 1000pF
INPUT
1327 G08
1327 G09
Driver Output Waveform
Receiver Output Waveform
INPUT
RECEIVER
OUTPUT
C
L
= 50pF
Receiver Short-Circuit Current
vs Temperature
TEMPERATURE (°C)
0
SHORT-CIRCUIT CURRENT (mA)
60
1327 G07
20
40
40
35
30
25
20
15
10
5
0
10
30
50
70
I
SC
+
I
SC
LTC1327
5
PI FU CTIO S
U
U
U
DOWN mode or V
CC
= 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 Lev-
els. Outputs are in a high impedance state when in SHUT-
DOWN mode to allow data line sharing.
C1
+
, C1
, C2
+
, C2
: Commutating Capacitor Inputs.
These pins require two external capacitors C = 0.1
µ
F. 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 20
.
DR IN: EIA/TIA-562 Driver Input Pins. Inputs are TTL/
CMOS compatible. Inputs should not be allowed to float.
Tie unused inputs to V
CC
.
DR OUT: Driver Outputs at EIA/TIA-562 Voltage Levels.
Outputs are in a high impedance state when in SHUT-
ESD Test Circuit
Driver Timing Test Load
Receiver Timing Test Load
RX
RX IN
51pF
RX
OUTPUT
1327 TC03
TEST CIRCUITS
DR1 OUT
RX1 IN
DR2 OUT
RX2 IN
RX3 IN
RX4 IN
DR3 OUT
RX5 IN
ON/OFF
NC
LT1327 · TC01
V
CC
C1
0.1
µ
F
EIA/TIA 562
LINE PINS
PROTECTED
TO ±10kV
LTC1327
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
DR1 IN
RX1 OUT
DR2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DR3 IN
RX5 OUT
V
V
+
GND
C2
0.1
µ
F
C3
0.1
µ
F
C4
0.1
µ
F
DR
DRIVER
INPUT
3k
51pF
DRIVER
OUTPUT
1327 TC02
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