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TI-TRS3318E.pdf
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RS232收发器
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READY
C1+
V+
C1−
C2+
C2−
V−
DOUT2
RIN2
ROUT2
FORCEOFF
V
CC
GND
DOUT1
RIN1
ROUT1
FORCEON
DIN1
DIN2
INVALID
DB OR PW PACKAGE
(TOP VIEW)
TRS3318E
www.ti.com
SLLS805B –APRIL 2007–REVISED OCTOBER 2013
2.5-V 460-kbps RS-232 TRANSCEIVER
WITH ±15-kV ESD PROTECTION
Check for Samples: TRS3318E
1
FEATURES
DESCRIPTION
The TRS3318E is a dual-driver, dual-receiver, RS-
• ESD Protection for RS-232 I/O Pins
232-compatible transceiver. The device features
– ±15 kV (Human-Body Model)
auto-powerdown plus and enhanced electrostatic
– ±8 kV (IEC 61000-4-2, Contact Discharge)
discharge (ESD) protection integrated into the chip.
Driver output and receiver input are protected to ±15
– ±15 kV (IEC 61000-4-2, Air-Gap Discharge)
kV using the IEC 61000-4-2 Air-Gap Discharge
• 300-µA Operating Supply Current
method, ±8 kV using the IEC 61000-4-2 Contact
• 1-µA Low-Power Standby Mode (With
Discharge method, and ±15 kV using the Human-
Receivers Active)
Body Model (HBM).
• Designed to Transmit at a Data Rate of
The device operates at a data rate of 460 kbps. The
460 kbps
transceiver has a proprietary low-dropout driver
output stage, enabling RS-232-compatible operation
• Auto-Powerdown Plus Option Features
from a 2.25-V to 3-V supply with a dual charge pump.
Flexible Power-Saving Mode
The charge pump requires only four 0.1-µF
• Operates From a Single 2.25-V to 3-V V
CC
capacitors and features a logic-level output (READY)
Supply
that asserts when the charge pump is regulating and
• Designed to be Interchangeable With Industry
the device is ready to begin transmitting.
Standard '3318 Devices
The TRS3318E achieves a 1-µA supply current using
the auto-powerdown feature. This device
APPLICATIONS
automatically enters a low-power power-down mode
when the RS-232 cable is disconnected or the drivers
• Battery-Powered Systems
of the connected peripherals are inactive for more
• PDAs
than 30 s. The device turns on again when it senses
• Cellular Phones
a valid transition at any driver or receiver input. Auto-
• Notebooks
powerdown saves power without changes to the
existing BIOS or operating system.
• Hand-Held Equipment
This device is available in two space-saving
• Pagers
packages: 20-pin SSOP and 20-pin TSSOP.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 2007–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
TRS3318E
SLLS805B –APRIL 2007–REVISED OCTOBER 2013
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
DETAILED DESCRIPTION
Flexible control options for power management are featured when the serial port and driver inputs are inactive.
The auto-powerdown plus feature functions when FORCEON is low and FORCEOFF is high. During this mode of
operation, if the device does not sense valid signal transitions on all receiver and driver inputs for approximately
30 s, the built-in charge pump and drivers are powered down, reducing the supply current to 1 µA. By
disconnecting the serial port or placing the peripheral drivers off, auto-powerdown plus can be disabled when
FORCEON and FORCEOFF are high. With auto-powerdown plus enabled, the device activates automatically
when a valid signal is applied to any receiver or driver input. INVALID is high (valid data) if any receiver input
voltage is greater than 2.7 V or less than –2.7 V, or has been between –0.3 V and 0.3 V for less than 30 µs
(typical number). INVALID is low (invalid data) if all receiver input voltage are between –0.3 V and 0.3 V for more
than 30 µs (typical number).
FUNCTION TABLE
(1)
INPUT CONDITIONS OUTPUT STATES
VALID
RECEIVER
OPERATING
RS-232
OR DRIVER
MODE
FORCEON FORCEOFF LEVEL DRIVER RECEIVER INVALID READY
EDGE
PRESENT AT
WITHIN 30 s
RECEIVER
Auto-Powerdown Plus Conditions
Normal operation,
H H No No Active Active L H auto-powerdown
plus disabled
Normal operation,
H H No Yes Active Active H H auto-powerdown
plus disabled
Normal operation,
L H Yes No Active Active L H auto-powerdown
plus enabled
Normal operation,
L H Yes Yes Active Active H H auto-powerdown
plus enabled
Power down,
L H No No Z Active L L auto-powerdown
plus enabled
Power down,
L H No Yes Z Active H L auto-powerdown
plus enabled
Manual power
X L X No Z Active L L
down
Manual power
X L X Yes Z Active H L
down
Auto-Powerdown Conditions
Power down,
INVALID INVALID X No Z Active L L auto-powerdown
enabled
Normal operation,
INVALID INVALID X Yes Active Active H H auto-powerdown
enabled
(1) H = high level, L = low level, X = irrelevant, Z = high impedance
2 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated
Product Folder Links: TRS3318E
DIN2
DIN1
DOUT2
DOUT1
Auto-powerdown Plus
INVALID
RIN1
RIN2
FORCEOFF
FORCEON
ROUT1
ROUT2
13
12
20
14
15
10
17
8
11
16
9
5 k
5 k
Ω
Ω
READY
1
TRS3318E
www.ti.com
SLLS805B –APRIL 2007–REVISED OCTOBER 2013
LOGIC DIAGRAM (POSITIVE LOGIC)
TERMINAL FUNCTIONS
TERMINAL
DESCRIPTION
NAME NO.
C1+ 2 Positive voltage-doubler charge-pump capacitor
C1– 4 Negative voltage-doubler charge-pump capacitor
C2+ 5 Positive inverting charge-pump capacitor
C2– 6 Negative inverting charge-pump capacitor
DIN 12, 13 CMOS driver inputs
DOUT 8, 17 RS-232 driver outputs
Force-off input, active low. Drive low to power down transmitters and charge pump. This overrides auto-
FORCEOFF 20
powerdown and FORCEON (see Function Table).
Force-on input, active high. Drive high to override auto-powerdown, keeping transmitters on (FORCEOFF must
FORCEON 14
be high) (see Function Table).
GND 18 Ground
Valid signal detector output, active low. A logic high indicates that a valid RS-232 level is present on a receiver
INVALID 11
input.
Ready to transmit output, active high. READY is enabled high when V– goes below –3.5 V and the device is
READY 1
ready to transmit.
RIN 9, 16 RS-232 receiver inputs
ROUT 10, 15 CMOS receiver outputs
V+ 3 2 × V
CC
generated by the charge pump
V– 7 –2 × V
CC
generated by the charge pump
V
CC
19 2.25-V to 3-V single-supply voltage
Copyright © 2007–2013, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Links: TRS3318E
TRS3318E
SLLS805B –APRIL 2007–REVISED OCTOBER 2013
www.ti.com
Absolute Maximum Ratings
(1)
over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
V
CC
to GND –0.3 6 V
V+ to GND
(2)
–0.3 7 V
V– to GND
(2)
–7 0.3 V
V+ + IV–I
(2)
13 V
DIN, FORCEON, FORCEOFF to GND –0.3 6
Input voltage V
RIN to GND ±25
DOUT to GND ±13.2
Output voltage V
ROUT, INVALID, READY to GND –0.3 V
CC
+ 0.3
Short-circuit duration DOUT to GND Continuous
20-pin SSOP (derate 8 mW/°C above 70°C) 640
Continuous power dissipation (T
A
= 70°C) mW
20-pin TSSOP (derate 7 mW/°C above 70°C) 559
Storage temperature range –65 150 °C
Lead temperature (soldering, 10 s) 300 °C
(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating
conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) V+ and V– can have maximum magnitudes of 7 V, but their absolute difference cannot exceed 13 V.
Recommended Operating Conditions
See Figure 4
MIN NOM MAX UNIT
Supply voltage 2.25 2.5 3 V
DIN, FORCEOFF,
V
IH
Driver and control high-level input voltage V
CC
= 2.5 V to 3 V 0.7 × V
CC
5.5 V
FORCEON
DIN, FORCEOFF,
V
IL
Driver and control low-level input voltage V
CC
= 2.5 V to 3 V 0 0.3 × V
CC
V
FORCEON
V
I
Receiver input voltage –25 25 V
TRS3318EC 0 70
T
A
Operating free-air temperature °C
TRS3318EI –40 85
4 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated
Product Folder Links: TRS3318E
TRS3318E
www.ti.com
SLLS805B –APRIL 2007–REVISED OCTOBER 2013
Supply Current Section
Electrical Characteristics
over recommended ranges of supply voltage and operating free-air temperature,
V
CC
= 2.25 V to 3 V, C1–C4 = 0.1 µF, T
A
= T
MIN
to T
MAX
(unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP
(1)
MAX UNIT
DC Characteristics (V
CC
= 2.5 V, T
A
= 25°C)
Auto-powerdown plus supply current FORCEON = GND, FORCEOFF = V
CC
, All RIN and DIN idle 1 10 µA
Auto-powerdown supply current FORCEOFF = GND 1 10 µA
Supply current FORCEON = FORCEOFF = V
CC
, No load 0.3 2 mA
(1) Typical values are at V
CC
= 2.5 V, T
A
= 25°C.
ESD Protection
PARAMETER TEST CONDITIONS TYP UNIT
HBM ±15
RIN, DOUT IEC 61000-4-2 Air-Gap Discharge method ±15 kV
IEC 61000-4-2 Contact Discharge method ±8
Copyright © 2007–2013, Texas Instruments Incorporated Submit Documentation Feedback 5
Product Folder Links: TRS3318E
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