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1
LT1330
5V RS232 Transceiver with
3V Logic Interface and One
Receiver Active in Shutdown
R
1330 TA02
U
S
A
O
PPLICATI
Output Waveforms
RECEIVER
OUTPUT
V
L
= 3V
C
L
= 50pF
DRIVER
OUTPUT
R
L
= 3k
C
L
= 2500pF
s
Notebook Computers
s
Palmtop Computers
U
A
O
PPLICATI
TYPICAL
INPUT
s
3V Logic Interface
s
ESD Protection over
10kV
s
Uses Small Capacitors: 0.1
F, 0.2
F, 1.0
F
s
One Low Power Receiver Remains Active While in
Shutdown
s
Pin Compatible with LT1137A and LT1237
s
120kBaud Operation for R
L
= 3k, C
L
= 2500pF
s
250kBaud Operation for R
L
= 3k, C
L
= 1000pF
s
CMOS Comparable Low Power: 30mW
s
Easy PC Layout--Flowthrough Architecture
s
Rugged Bipolar Design
s
Outputs Assume a High Impedance State When Off
or Powered Down
s
Absolutely No Latchup
s
60
A Supply Current in Shutdown
s
Available in SO and SSOP Packages
D
U
ESCRIPTIO
S
FEATURE
, LTC and LT are registered trademarks of Linear Technology Corporation.
The LT
1330 is a three driver, five receiver RS232 trans-
ceiver with low supply current. Designed to interface with
new 3V logic, the LT1330 operates with both a 5V power
supply and a 3V logic power supply. The chip may be shut
down to micropower operation with one receiver remain-
ing active to monitor RS232 inputs such as ring detect
from a modem.
The LT1330 is fully compliant with all EIA RS232 specifi-
cations. Additionally, the RS232 line input and output pins
are resilient to multiple
10kV ESD strikes. This eliminates
the need for costly TransZorbs
on line pins for the RS232
part.
The LT1330 operates to 120kbaud even driving high
capacitive loads. During shutdown, driver and receiver
outputs are at a high impedance state allowing devices to
be paralleled.
TransZorb is a registered trademark of General Instruments, GSI
1330 TA01
5V V
CC
1.0
F
2
0.1
F
0.1
F
TO
LINE
LT1330
1
2
3
4
5
6
7
8
9
10
11
12
13
14
DRIVER 1 OUT
RX1 IN
DRIVER 2 OUT
RX2 IN
RX3 IN
RX4 IN
DRIVER 3 OUT
RX5 IN (LOW-Q)
ON/OFF
3V V
L
28
27
26
25
24
23
22
21
20
19
18
17
16
15
2
0.1
F
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DRIVER 3 IN
RX5 OUT (LOW-Q)
GND
DRIVER
DISABLE
RING DETECT IN
SHUTDOWN
CONTROL OUT
CONTROLLER OR
PROCESSOR
TO LOGIC
V
V
+
2
LT1330
(Note 1)
Supply Voltage (V
CC
) ................................................ 6V
Supply Voltage (V
L
) .................................................. 6V
V
+
........................................................................ 13.2V
V
...................................................................... 13.2V
Input Voltage
Driver ........................................................... V
to V
+
Receiver ................................................ 30V to 30V
Output Voltage
Driver .................................................... 30V to 30V
Receiver ...................................... 0.3V to V
L
+ 0.3V
Short-Circuit Duration
V
+
................................................................... 30 sec
V
................................................................... 30 sec
Driver Output .............................................. Indefinite
Receiver Output .......................................... Indefinite
Operating Temperature Range
LT1330I ............................................. 40
C to 85
C
LT1330C ................................................. 0
C to 70
C
Storage Temperature Range ................ 65
C to 150
C
Lead Temperature (Soldering, 10 sec)................. 300
C
A
U
G
W
A
W
U
W
A
R
BSOLUTE
XI
TI
S
W
U
U
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
ELECTRICAL C
C
HARA TERISTICS
(Note 2)
Consult factory for Military grade parts.
LT1330CG
LT1330CJW
LT1330CNW
LT1330CSW
LT1330IJW
T
JMAX
= 150
C,
JA
= 96
C/ W (G)
T
JMAX
= 150
C,
JA
= 62
C/ W (JW)
T
JMAX
= 150
C,
JA
= 56
C/ W (NW)
T
JMAX
= 150
C,
JA
= 85
C/ W (SW)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
V
+
5V V
CC
C1
+
C1
DR1 OUT
RX1 IN
DR2 OUT
RX2 IN
RX3 IN
RX4 IN
DR3 OUT
RX5 IN
(LOW-Q)
ON/OFF
3V V
L
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
(LOW-Q)
GND
DRIVER
DISABLE
NC
JW PACKAGE
28-LEAD (WIDE) CERDIP
NW PACKAGE
28-LEAD (WIDE) PDIP
TOP VIEW
SW PACKAGE
28-LEAD (WIDE) PLASTIC SO
G PACKAGE
28-LEAD PLASTIC SSOP
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Power Supply Generator
V
+
Output
7.9
V
V
Output
7
V
Supply Current (V
CC
)
T
A
= 25
C (Note 3)
6
12
mA
q
6
14
mA
Supply Current (V
L
)
(Note 4)
0.1
1
mA
Supply Current When OFF (V
CC
)
Shutdown (Note 5)
q
0.06
0.15
mA
Driver Disable
3.00
mA
Supply Rise Time
C1 = C2 = 0.2
F,
0.2
ms
Shutdown to Turn-On
C
+
= 1.0
F, C
= 0.1
F
ON/OFF Pin Thresholds
Input Low Level (Device Shutdown)
q
0.8
1.4
V
Input High Level (Device Enabled)
q
1.4
2.4
V
ON/OFF Pin Current
0V
V
ON/OFF
5V
q
15
80
A
DRIVER DISABLE Pin Thresholds
Input Low Level (Drivers Enabled)
q
0.8
1.4
V
Input High Level (Drivers Disabled)
q
1.4
2.4
V
DRIVER DISABLE Pin Current
0V
V
DRIVER DISABLE
5V
q
10
500
A
Oscillator Frequency
Driver Outputs Loaded R
L
= 3k
130
kHz
3
LT1330
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Any Driver
Output Voltage Swing
Load = 3k to GND
Positive
q
5.0
7.5
V
Negative
q
6.3
5.0
V
Logic Input Voltage Level
Input Low Level (V
OUT
= High)
q
1.4
0.8
V
Input High Level (V
OUT
= Low)
q
2.0
1.4
V
Logic Input Current
0.8V
V
IN
2V
q
5
20
A
Output Short-Circuit Current
V
OUT
= 0V
9
17
mA
Output Leakage Current
Shutdown V
OUT
=
30V (Note 5)
q
10
100
A
Data Rate (Note 8)
R
L
= 3k, C
L
= 2500pF
120
kBaud
R
L
= 3k, C
L
= 1000pF
250
kBaud
Slew Rate
R
L
= 3k, C
L
= 51pF
15
30
V/
s
R
L
= 3k, C
L
= 2500pF
4
15
V/
s
Propagation Delay
Output Transition t
HL
High to Low (Note 6)
0.6
1.3
s
Output Transition t
LH
Low to High
0.5
1.3
s
Any Receiver
Input Voltage Thresholds
Input Low Threshold (V
OUT
= High)
0.8
1.3
V
Input High Threshold (V
OUT
= Low)
1.7
2.4
V
Hysteresis
q
0.1
0.4
1.0
V
Input Resistance
V
IN
=
10V
3
5
7
k
Output Leakage Current
Shutdown (Note 5) 0
V
OUT
V
CC
q
1
10
A
Receivers 1, 2, 3, 4
Output Voltage
Output Low, I
OUT
= 1.6mA
q
0.2
0.4
V
Output High, I
OUT
= 160
A (V
L
= 3V)
q
2.7
2.9
V
Output Short-Circuit Current
Sinking Current, V
OUT
= V
CC
10
20
mA
Sourcing Current, V
OUT
= 0V
10
20
mA
Propagation Delay
Output Transition t
HL
High to Low (Note 7)
250
600
ns
Output Transition t
LH
Low to High
350
600
ns
Receiver 5 (LOW Q-Current RX)
Output Voltage
Output Low, I
OUT
= 500
A
q
0.2
0.4
V
Output High, I
OUT
= 160
A (V
L
= 3V)
q
2.7
2.9
V
Output Short-Circuit Current
Sinking Current, V
OUT
= V
CC
2
4
mA
Sourcing Current, V
OUT
= 0V
2
4
mA
Propagation Delay
Output Transition t
HL
High to Low (Note 7)
1
3
s
Output Transition t
LH
Low to High
1
3
s
ELECTRICAL C
C
HARA TERISTICS
(Note 2)
The
q
denotes specifications which apply over the operating temperature
range (0
C
T
A
70
C for commercial grade, and 40
C
T
A
85
C for
industrial grade).
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: Testing done at V
CC
= 5V and V
ON/OFF
= 3V.
Note 3: Supply current is measured as the average over several charge
pump burst cycles. C
+
= 1.0
F, C
= 0.1
F, C1 = C2 = 0.2
F. All outputs
are open, with all driver inputs tied high.
Note 4: V
L
supply current is measured with all receiver outputs low.
Note 5: Measurements in shutdown are performed with V
ON/OFF
0.1V.
Supply current measurements using driver disable are performed with
V
DRIVER DISABLE
3V.
Note 6: For driver delay measurements, R
L
= 3k and C
L
= 51pF. Trigger
points are set between the driver's input logic threshold and the output
transition to the zero crossing (t
HL
= 1.4V to 0V and t
LH
= 1.4V to 0V).
Note 7: For receiver delay measurements, C
L
= 51pF. Trigger points are
set between the receiver's input logic threshold and the output transition
to standard TTL/CMOS logic threshold (t
HL
= 1.3V to 2.4V and t
LH
= 1.7V
to 0.8V).
Note 8: Data rate operation guaranteed by slew rate, short-circuit current
and propagation delay tests.
4
LT1330
C
C
HARA TERISTICS
U
W
A
TYPICAL PERFOR
CE
Driver Output Voltage
Receiver Input Thresholds
Supply Current vs Data Rate
DRIVER DISABLE Threshold
ON/OFF Thresholds
V
CC
Supply Current
Driver Leakage in Shutdown
V
CC
Supply Current in
Driver Disable
TEMPERATURE (C)
55
10
DRIVER OUTPUT VOLTAGE (V)
8
4
2
0
10
4
0
50
75
1330 G01
6
6
8
2
25
25
100
125
OUTPUT HIGH
OUTPUT LOW
R
L
= 3k
V
CC
= 5V
V
CC
= 4.5V
V
CC
= 4.5V
V
CC
= 5V
TEMPERATURE (C)
55
0.50
THRESHOLD VOLTAGE (V)
0.75
1.25
1.50
1.75
3.00
2.25
0
50
75
1330 G02
1.00
2.50
2.75
2.00
25
25
100
125
INPUT HIGH
INPUT LOW
DATA RATE (kBAUD)
0
0
SUPPLY CURRENT (mA)
20
30
40
60
25
50
125
150
1330 G03
70
80
50
10
75
100
3DRIVERS ACTIVE
R
L
= 3k
C
L
= 2500pF
TEMPERATURE (C)
55
0
SUPPLY CURRENT (mA)
2
5
0
50
75
1330 G05
1
4
3
25
25
100
125
TEMPERATURE (C)
0
SUPPLY CURRENT (mA)
10
15
20
30
1330 G08
35
40
25
5
3DRIVERS LOADED
R
L
= 3k
55
0
50
75
25
25
100
125
1DRIVER LOADED
R
L
= 3k
NO LOAD
TEMPERATURE (C)
55
SUPPLY CURRENT (
A)
100
125
150
25
75
1330 G04
75
50
25
0
50
100
125
25
0
TEMPERATURE (C)
55
THRESHOLD VOLTAGE (V)
2.0
2.5
3.0
25
75
1330 G06
1.5
1.0
25
0
50
100
125
0.5
0
TEMPERATURE (C)
0.1
LEAKAGE CURRENT (
A)
10
100
1330 G09
1
55
0
50
75
25
25
100
125
V
OUT
= 30V
V
OUT
= 30V
TEMPERATURE (C)
55
THRESHOLD VOLTAGE (V)
2.0
2.5
3.0
25
75
1330 G07
1.5
1.0
25
0
50
100
125
0.5
0
ON THRESHOLD
OFF THRESHOLD
V
CC
Supply Current in Shutdown
5
LT1330
C
C
HARA TERISTICS
U
W
A
TYPICAL PERFOR
CE
V
CC
: 5V Input Supply Pin. This pin should be decoupled
with a 0.1
F ceramic capacitor close to the package pin.
Insufficient supply bypassing can result in low output
drive levels and erratic charge pump operation.
V
L
: 3V Logic Supply Pin for all RS232 Receivers. Like V
CC
,
the V
L
input should be decoupled with a 0.1
F ceramic
capacitor. This pin may also be connected to 5V.
GND: Ground Pin.
ON/OFF: TTL/CMOS Compatible Operating Mode Control.
A logic low puts the device in the low power shutdown
mode. All three drivers and four receivers (RX1, RX2, RX3,
and RX4) assume a high impedance output state in shut-
down. Only receiver RX5 remains active while the trans-
ceiver is in shutdown. The transceiver consumes only
PI FU CTIO S
U
U
U
60
A of supply current while in shutdown. A logic high
fully enables the transceiver.
DRIVER DISABLE: This pin provides an alternate control
for the charge pump and RS232 drivers. A logic high on
this pin shuts down the charge pump and places all driver
outputs in a high impedance state. All five receivers remain
active under these conditions. Floating the driver disable
pin or driving it to a logic low level fully enables the
transceiver. A logic low on the ON/OFF pin supersedes the
state of the DRIVER DISABLE pin. Supply current drops to
3mA when in driver disable mode.
V
+
: Positive Supply Output. V
+
2V
CC
1.5V. This pin
requires an external charge storage capacitor, C
1.0
F,
tied to ground or 5V. Larger value capacitors may be used
Receiver Output Waveforms
RX5 OUTPUT
C
L
= 50pF
Receiver Short-Circuit Current
Driver Short-Circuit Current
TEMPERATURE (C)
55
0
SHORT-CIRCUIT CURRENT (mA)
15
40
0
50
75
1330 G11
10
35
25
25
25
100
125
30
20
5
RX1 TO RX4
I
SC+
RX1 TO RX4
I
SC
RX5 I
SC+
RX5 I
SC
TEMPERATURE (
C)
55
SHORT-CIRCUIT CURRENT (mA)
20
25
30
25
75
1330 G10
15
10
25
0
50
100
125
5
0
I
SC
+
I
SC
V
L
= 3V
INPUT
1330 G13
INPUT
DRIVER OUTPUT
R
L
= 3k
DRIVER OUTPUT
R
L
= 3k
C
L
= 2500pF
RX1 TO RX4
OUTPUT
C
L
= 50pF
1330 G12
Driver Output Waveforms
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