LTC2801CDE-PBF LINER [Linear Technology], LTC2801CDE-PBF Datasheet

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LTC2801CDE-PBF

Manufacturer Part Number
LTC2801CDE-PBF
Description
1.8V to 5.5V RS-232 Single and Dual Transceivers
Manufacturer
LINER [Linear Technology]
Datasheet
1.LTC2801CDE-PBF.pdf (16 pages)
APPLICATIONS
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
FEATURES
n
n
n
n
n
n
n
n
n
n
n
n
TYPICAL APPLICATION
1.8V to 5.5V Supply Voltage
Single and Dual Transceivers
High-Speed Operation
Low-Power 1μA Shutdown and 15μA Receivers-
Active Modes
No Damage or Latch-Up to ±10kV ESD on RS-232
Interface
Logic Supply Pin for Easy Level-Shifting to UART or
Microprocessor
Low-Latency Output Enable Allows Line Sharing and
Half-Duplex Operation
True RS-232 Compliant Output Levels
Small Footprint:
Battery-Powered Systems
Computers and Consumer Electronics
Diagnostic Ports
1Mbps for 250pF/3kΩ Load (LTC2802, LTC2804)
250kbps for 1nF/3kΩ Load
100kbps for 2.5nF/3kΩ TIA/EIA-232-F Load
LTC2801/LTC2802 4mm × 3mm DFN Package
LTC2803/LTC2804 Narrow SSOP-16 and
5mm × 3mm DFN Packages
OFF ON
1.8V TO 5.5V
C4
1μF
V
V
PS
MODE
TIN
ROUT
GND
CC
L
LTC2802
10μH
V
L1
DD
C2
1μF
TOUT
CAP
RIN
SW
V
EE
C1
220nF
C3
1μF
2801 TA01a
Single and Dual Transceivers
PRODUCT SELECTION GUIDE
DESCRIPTION
PART NUMBER
LTC2801
LTC2802
LTC2803
LTC2803-1
LTC2804
LTC2804-1
The LTC
dual RS-232 transceivers in narrow SSOP and chip-scale
DFN packages. All operate over a supply range of 1.8V to
5.5V, which permits operation directly from two alkaline,
NiCd or NiMH cells. An integrated DC-to-DC converter
generates power supplies for driving RS-232 levels. A
logic supply pin allows easy interfacing with different logic
levels independent of the DC-DC supply.
These parts are compatible with the TIA/EIA-232-F stan-
dard. Driver outputs are protected from overload and can
be shorted to ground or up to ±15V without damage. To
extend battery life, receivers can be kept active, operating
at reduced speed, with only 15μA current. In shutdown
mode, current is further reduced to 1μA. Line sharing and
half-duplex operation are also supported.
®
2801/LTC2802/LTC2803/LTC2804 are single and
2V/DIV
5V/DIV
2V/DIV
1.8V to 5.5V RS-232
DRIVERS
LTC2802 at 1.8V and 1Mbps
V
WRAPPING DATA
TOUT LOAD = 250pF + RIN
ROUT LOAD = 150pF
CC
LTC2801/LTC2802/
1
1
2
2
2
2
= V
LTC2803/LTC2804
TIN
L
TOUT
= 1.8V
ROUT
400ns/DIV
RECEIVERS
1
1
2
2
2
2
2801 TA01b
16-Lead Narrow SSOP
16-Lead Narrow SSOP
12-Lead DFN
12-Lead DFN
16-Lead DFN
16-Lead DFN
PACKAGE
2801234fc
1

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LTC2801CDE-PBF Summary of contents

Page 1

FEATURES n 1.8V to 5.5V Supply Voltage n Single and Dual Transceivers n High-Speed Operation 1Mbps for 250pF/3kΩ Load (LTC2802, LTC2804) 250kbps for 1nF/3kΩ Load 100kbps for 2.5nF/3kΩ TIA/EIA-232-F Load n Low-Power 1μA Shutdown and 15μA Receivers- Active Modes n ...

Page 2

... PLASTIC DFN T = 125°C, θ = 43°C/W, θ = 4.3°C/W (4 Layer) JMAX JA JC EXPOSED PAD (PIN 13 MUST BE SOLDERED TO PCB EE ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LTC2801CDE#PBF LTC2801CDE#TRPBF LTC2801IDE#PBF LTC2801IDE#TRPBF LTC2802CDE#PBF LTC2802CDE#TRPBF LTC2802IDE#PBF LTC2802IDE#TRPBF LTC2803CDHC#PBF LTC2803CDHC#TRPBF LTC2803IDHC#PBF LTC2803IDHC#TRPBF LTC2804CDHC#PBF LTC2804CDHC#TRPBF LTC2804IDHC#PBF LTC2804IDHC#TRPBF ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T given for 3.3V and T = 25°C, unless otherwise noted SYMBOL PARAMETER Power Supplies I V Supply Current Supply ...

Page 4

LTC2801/LTC2802/ LTC2803/LTC2804 SWITCHING CHARACTERISTICS temperature range, otherwise specifi cations are at T given for 3.3V and T = 25°C, unless otherwise noted SYMBOL PARAMETER Maximum Data Rate Driver SR(D) Driver Slew Rate t ...

Page 5

TEST CIRCUITS R TIN L TIN ≤ 40ns TIN L TIN ≤ 40ns r f RIN RIN ≤ 40ns MODE L ...

Page 6

LTC2801/LTC2802/ LTC2803/LTC2804 TEST CIRCUITS GND – AND MODE L PS AND MODE ≤ 40ns r f TYPICAL PERFORMANCE CHARACTERISTICS LTC2803 at 1.8V and 250kbps T1IN 2V/DIV T1OUT T2OUT 10V/DIV R1OUT R2OUT 2V/DIV V ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS Receiver Input Threshold vs Temperature 1.8V 2.5 L INPUT HIGH 2.0 1.5 INPUT LOW 1.0 0.5 0 –50 – 100 TEMPERATURE (°C) ...

Page 8

LTC2801/LTC2802/ LTC2803/LTC2804 PIN FUNCTIONS PIN NUMBER 2801 2803 PIN NAME 2802 2804 13* 17 GND 6 8 CAP TIN (T1IN, T2IN) ...

Page 9

FEATURE SUMMARY FEATURE DRIVERS and RECEIVERS PACKAGE 1.8V - 5.5V OPERATION 1.8V - 5.5V LOGIC SUPPLY ( SHUTDOWN (1μA) RECEIVER(S) ACTIVE (15μA) DRIVER DISABLE 100kb/s for R = 3kΩ 2.5nF L L 250kb/s for R = ...

Page 10

LTC2801/LTC2802/ LTC2803/LTC2804 APPLICATIONS INFORMATION Overview The LTC2801 family of RS-232 transceivers operates supply of 1.8V to 5.5V, utilizing a switching regula- CC tor to generate the necessary higher voltage rails for the drivers. The transceivers interface with ...

Page 11

APPLICATIONS INFORMATION Table 3. Recommended Inductors PART I MAX DCR SIZE SAT NUMBER (mA) (Ω) (mm) LQH2MCN100K02L 225 1.2 2 × 1.6 × 0.95 Murata LBC2016T100K 245 0.85 2 × 1.6 × 1.6 Taiyo Yuden FSLB2520-100K 220 1.1 2.5 × ...

Page 12

LTC2801/LTC2802/ LTC2803/LTC2804 TYPICAL APPLICATIONS 1. LTC2803 MODE T2IN 13 14 T1IN R2OUT 15 16 R1OUT GND 8 Figure 10. Power-Saving Receivers-Active Mode 1.8V CC ...

Page 13

TYPICAL APPLICATIONS 2801F18 DATA RATE (kbps) C (nF) LTC2803 LTC2804 L 100 250 1000 0.5 X Figure 18. Driving Larger Loads 1. 220nF V ...

Page 14

LTC2801/LTC2802/ LTC2803/LTC2804 TYPICAL APPLICATIONS 3.30 ±0.05 3.60 ±0.05 2.20 ±0.05 1.70 ± 0.05 0.25 ± 0.05 0.50 BSC 2.50 REF RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED NOTE: 1. DRAWING PROPOSED TO ...

Page 15

PACKAGE DESCRIPTION .254 MIN .0165 ± .0015 RECOMMENDED SOLDER PAD LAYOUT .007 – .0098 (0.178 – 0.249) .016 – .050 (0.406 – 1.270) NOTE: 1. CONTROLLING DIMENSION: INCHES INCHES 2. DIMENSIONS ARE IN (MILLIMETERS) 3. DRAWING NOT TO SCALE *DIMENSION ...

Page 16

LTC2801/LTC2802/ LTC2803/LTC2804 TYPICAL APPLICATION 1.8V TO 5.5V + – DC-DC *ADDITIONAL BYPASS CAPACITOR AS NEEDED Figure 22. Diagnostic Port Operating Directly Off Unregulated Battery Voltage RELATED PARTS PART NUMBER DESCRIPTION LT1780/LT1781 2-Driver/2-Receiver RS232 Transceiver LTC1337 3-Driver/5-Receiver RS232 Transceiver LTC1338 5-Driver/3-Receiver ...

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