TEXAS INSTRUMENTS TRS3318 Technical data
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
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)
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1
FEATURES
• ESD Protection for RS-232 I/O Pins
– ± 15 kV Human-Body Model (HBM)
– ± 8 kV IEC 61000-4-2, Contact Discharge
– ± 8 kV IEC 61000-4-2, Air-Gap Discharge
• 300- μ A Operating Supply Current
• 1- μ A Low-Power Standby (With Receivers
Active) Mode
• Designed to Transmit at a Data Rate of
460 kbps
• Auto-Powerdown Plus Option Features
Flexible Power-Saving Mode
• Operates From a Single 2.25-V to 3-V V
Supply
APPLICATIONS
• Battery-Powered Systems
• PDAs
• Cellular Phones
• Notebooks
• Hand-Held Equipment
• Pagers
TRS3318
2.5-V 460-kbps RS-232 TRANSCEIVER
WITH ± 15-kV ESD PROTECTION
SLLS820 – AUGUST 2007
CC
DESCRIPTION/ORDERING INFORMATION
The TRS3318 is a dual-driver, dual-receiver, RS-232 compatible transceiver. The device features
auto-powerdown plus and enhanced electrostatic discharge (ESD) protection integrated into the chip. Driver
output and receiver input are protected to ± 8 kV using the IEC 61000-4-2 Air-Gap Discharge method, ± 8 kV
using the IEC 61000-4-2 Contact Discharge method, and ± 15 kV using the Human-Body Model (HBM).
The device operates at a data rate of 460 kbps. The transceiver has a proprietary low-dropout driver output stage
enabling RS-232-compatible operation from a 2.25-V to 3-V supply with a dual charge pump. The charge pump
requires only four 0.1- μ F capacitors and features a logic-level output (READY) that asserts when the charge
pump is regulating and the device is ready to begin transmitting.
The TRS3318 achieves a 1- μ A supply current using the auto-powerdown feature. This device automatically
enters a low-power power-down mode when the RS-232 cable is disconnected or the drivers of the connected
peripherals are inactive for more than 30 s. The device turns on again when it senses a valid transition at any
driver or receiver input. Auto-powerdown saves power without changes to the existing BIOS or operating system.
This device is available in two space-saving packages: 20-pin SSOP and 20-pin TSSOP.
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 μ A. 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 μ s
(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 μ s (typical number).
1
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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.
Copyright © 2007, Texas Instruments Incorporated
www.ti.com
TRS3318
2.5-V 460-kbps RS-232 TRANSCEIVER
WITH ± 15-kV ESD PROTECTION
SLLS820 – AUGUST 2007
ORDERING INFORMATION
T
A
SSOP – DB RV18C
0 ° C to 70 ° C
TSSOP – PW RV18C
SSOP – DB RV18I
– 40 ° C to 85 ° C
TSSOP – PW RV18I
(1) Package drawings,thermal data, and symbolization are available at www.ti.com/packaging .
(2) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com .
PACKAGE
(1) (2)
Tube of 70 TRS3318CDB
Reel of 2000 TRS3318CDBR
Tube of 70 TRS3318CPW
Reel of 2000 TRS3318CPWR
Tube of 70 TRS3318IDB
Reel of 2000 TRS3318IDBR
Tube of 70 TRS3318IPW
Reel of 2000 TRS3318IPWR
ORDERABLE PART NUMBER TOP-SIDE MARKING
FUNCTION TABLE
INPUT CONDITIONS OUTPUT STATES
RECEIVER
FORCEON FORCEOFF LEVEL DRIVER RECEIVER INVALID READY
H H No No Active Active L H auto-powerdown
H H No Yes Active Active H H auto-powerdown
L H Yes No Active Active L H auto-powerdown
L H Yes Yes Active Active H H auto-powerdown
L H No No Z Active L L auto-powerdown
L H No Yes Z Active H L auto-powerdown
X L X No Z Active L L
X L X Yes Z Active H L
INVALID INVALID X No Z Active L L auto-powerdown
INVALID INVALID X Yes Active Active H H auto-powerdown
(1) H = high level, L = low level, X = irrelevant, Z = high impedance
OR DRIVER
EDGE
WITHIN 30 s
VALID
RS-232
PRESENT AT
RECEIVER
Auto-Powerdown Plus Conditions
Auto-Powerdown Conditions
(1)
OPERATING
MODE
Normal operation,
plus disabled
Normal operation,
plus disabled
Normal operation,
plus enabled
Normal operation,
plus enabled
Power down,
plus enabled
Power down,
plus enabled
Manual power
down
Manual power
down
Power down,
enabled
Normal operation,
enabled
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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
LOGIC DIAGRAM (POSITIVE LOGIC)
TRS3318
2.5-V 460-kbps RS-232 TRANSCEIVER
WITH ± 15-kV ESD PROTECTION
SLLS820 – AUGUST 2007
TERMINAL FUNCTIONS
TERMINAL
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
FORCEOFF 20
FORCEON 14
GND 18 Ground
INVALID 11
READY 1
RIN 9, 16 RS-232 receiver inputs
ROUT 10, 15 CMOS receiver outputs
V+ 3 2 × V
V – 7 – 2 × V
V
CC
Force-off input, active low. Drive low to power down transmitters, receivers, and charge pump. This overrides
auto-powerdown and FORCEON (see Function Table).
Force-on input, active high. Drive high to override auto-powerdown, keeping transmitters and receivers on
( FORCEOFF must be high) (see Function Table).
Valid signal detector output, active low. A logic high indicates that a valid RS-232 level is present on a receiver
input.
Ready to transmit output, active high. READY is enabled high when V – goes below – 3.5 V and the device is
ready to transmit.
generated by the charge pump
CC
generated by the charge pump
CC
19 2.25-V to 3-V single-supply voltage
DESCRIPTION
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TRS3318
2.5-V 460-kbps RS-232 TRANSCEIVER
WITH ± 15-kV ESD PROTECTION
SLLS820 – AUGUST 2007
Absolute Maximum Ratings
(1)
over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
V
CC
V+ Positive supply voltage range
V – Negative supply voltage range
V+ + IV – I Supply voltage differential
V
I
V
O
Supply voltage range – 0.3 6 V
(2)
(2)
(2)
Input voltage V
Output voltage V
DIN, FORCEON, FORCEOFF to GND – 0.3 6
RIN to GND ± 25
DOUT to GND ± 13.2
ROUT, INVALID, READY to GND – 0.3 V
– 0.3 7 V
– 7 0.3 V
CC
Short-circuit duration DOUT to GND Continuous
16-pin SSOP (derate 7.14 mW/ ° C above 70 ° C) 571
Continuous power dissipation
(T
= 70 ° C)
A
T
stg
Storage temperature range – 65 150 ° C
20-pin SSOP (derate 8 mW/ ° C above 70 ° C 640 mW
20-pin TSSOP (derate 7 mW/ ° C above 70 ° C) 559
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
V
Driver and control high-level input voltage V
IH
V
Driver and control low-level input voltage V
IL
V
Receiver input voltage – 25 25 V
I
T
Operating free-air temperature ° C
A
DIN, FORCEOFF,
FORCEON
DIN, FORCEOFF,
FORCEON
= 2.5 V to 3 V 0.7 × V
CC
= 2.5 V to 3 V 0 0.3 × V
CC
CC
TRS3318C 0 70
TRS3318I – 40 85
+ 0.3
13 V
5.5 V
CC
V
Electrical Characteristics
V
= 2.25 V to 3 V, C1 – C4 = 0.1 μ F, TA= T
CC
PARAMETER TEST CONDITIONS MIN TYP
DC Characteristics (V
= 2.5 V, TA= 25 ° C)
CC
to T
MIN
(unless otherwise noted)
MAX
(1)
MAX UNIT
Auto-powerdown plus supply current FORCEON = GND, FORCEOFF = VCC, All RIN and DIN idle 1 10 μ A
Auto-powerdown supply current FORCEOFF = GND 1 10 μ A
Supply current FORCEON = FORCEOFF = VCC, No load 0.3 2 mA
(1) Typical values are at V
= 2.5 V, TA= 25 ° C.
CC
ESD Protection
PARAMETER TEST CONDITIONS TYP UNIT
Human-Body Model (HBM) ± 15
RIN, DOUT IEC 61000-4-2 Air-Gap Discharge method ± 8 kV
IEC 61000-4-2 Contact Discharge method ± 8
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TRS3318
2.5-V 460-kbps RS-232 TRANSCEIVER
WITH ± 15-kV ESD PROTECTION
SLLS820 – AUGUST 2007
DRIVER SECTION
Electrical Characteristics
over recommended ranges of supply voltage and operating free-air temperature,
V
= 2.25 V to 3 V, C1 – C4 = 0.1 μ F, TA= T
CC
PARAMETER TEST CONDITIONS MIN TYP
V
hys
I
on
V
om
r
O
I
OS
I
off
(1) Typical values are at V
(2) Short-circuit durations should be controlled to prevent exceeding the device absolute power dissipation ratings, and not more than one
Driver input hysteresis 0.3 V
Input leakage current FORCEON, DIN, FORCEOFF ± 0.01 ± 1 μ A
Output voltage swing All driver outputs loaded with 3 k Ω to ground ± 3.7 ± 4 V
Output resistance V
Output short-circuit current
(2)
Output leakage current ± 25 μ A
= 2.5 V, TA= 25 ° C.
CC
output should be shorted at a time.
Switching Characteristics
over recommended ranges of supply voltage and operating free-air temperature,
V
= 2.25 V to 3 V, C1 – C4 = 0.1 μ F, TA= T
CC
PARAMETER TEST CONDITIONS MIN TYP
Maximum data rate RL= 3 k Ω , CL= 1000 pF, One transmitter switching 460 kbps
|t
– t
PHL
| Driver skew
PLH
SR(tr) Transition-region slew rate Measured from 3 V to – 3 V or – 3 V to 3 V, 4 30 V/ μ s
(1) Typical values are at V
(2) Pulse skew is defined as |t
(2)
= 2.5 V, TA= 25 ° C.
CC
PLH
– t
| of each channel of the same device.
PHL
to T
MIN
V
disabled
to T
MIN
V
CC
(unless otherwise noted) (see Figure 4 )
MAX
= 0, Driver output = ± 2 V 300 10M Ω
CC
= 0 or 2.25 V to 3 V, V
CC
(unless otherwise noted) (see Figure 1 )
MAX
= ± 12 V, Drivers
OUT
= 2.5 V, TA= 25 ° C, RL= 3 k Ω to 7 k Ω ,
CL= 150 pF to 2500 pF
(1)
MAX UNIT
± 25 ± 60 mA
(1)
MAX UNIT
100 ns
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TRS3318
2.5-V 460-kbps RS-232 TRANSCEIVER
WITH ± 15-kV ESD PROTECTION
SLLS820 – AUGUST 2007
RECEIVER SECTION
Electrical Characteristics
over recommended ranges of supply voltage and operating free-air temperature,
V
= 2.25 V to 3 V, C1 – C4 = 0.1 μ F, TA= T
CC
PARAMETER TEST CONDITIONS MIN TYP
V
I
V
IT+
V
IT –
V
hys
r
i
I
off
V
OL
V
OH
(1) Typical values are at V
Input voltage range – 25 25 V
Input voltage threshold low TA= 25 ° C 0.3 × V
Input voltage threshold high TA= 25 ° C 0.7 × V
Input hysteresis 0.3 V
Input resistance TA= 25 ° C 3 5 7 k Ω
Output leakage current ± 0.05 ± 10 μ A
Output voltage low I
Output voltage high I
= 2.5 V, TA= 25 ° C.
CC
Switching Characteristics
over recommended ranges of supply voltage and operating free-air temperature,
V
= 2.25 V to 3 V, C1 – C4 = 0.1 μ F, TA= T
CC
PARAMETER TEST CONDITIONS TYP
t
PHL
t
PLH
|t
– t
PHL
PLH
(1) Typical values are at V
(2) Pulse skew is defined as |t
Receiver propagation delay RIN to ROUT, CL= 150 pF μ s
| Receiver skew
(2)
= 2.5 V, TA= 25 ° C.
CC
– t
PLH
| of each channel of the same device.
PHL
to T
MIN
MAX
to T
MIN
MAX
(unless otherwise noted) (see Figure 4 )
CC
= 0.5 mA 0.1 × V
OUT
= – 0.5 mA 0.9 × V
OUT
CC
(unless otherwise noted) (see Figure 4 )
(1)
MAX UNIT
V
CC
V
V
CC
V
(1)
UNIT
0.175
0.175
50 ns
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