LTC2803CDHC Datasheet, PDF (1/18 Pages) Linear Technology – 1.8V to 5.5V RS-232 Single and Dual Transceivers

LTC2801/LTC2802/
LTC2803/LTC2804
1.8V to 5.5V RS-232
Single and Dual Transceivers
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 _{No Damage or Latchup to ±10kV ESD on RS-232}
Interface
n _{Logic Supply Pin for Easy Level-Shifting to UART or}
Microprocessor
n _{Low-Latency Output Enable Allows Line Sharing and}
Half-Duplex Operation
n _{True RS-232 Compliant Output Levels}
n _{Small Footprint:}
LTC2801/LTC2802 4mm × 3mm DFN Package
LTC2803/LTC2804 Narrow SSOP-16 and
5mm × 3mm DFN Packages
Applications
n _{Battery-Powered Systems}
n _{Computers and Consumer Electronics}
n _{Diagnostic Ports}
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Description
The LTC^®2801/LTC2802/LTC2803/LTC2804 are single and
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.
Product Selection Guide
DRIVERS AND MAXIMUM
PART NUMBER RECEIVERS DATA RATE
MODES*
PACKAGE
LTC2801
1+1
0.25Mbps SD, RA, DD, AO DFN-12
LTC2802
1+1
1Mbps SD, RA, DD, AO DFN-12
LTC2803
2+2
0.25Mbps SD, RA, DD, AO DFN-16
LTC2803-1
2+2
0.25Mbps
SD, AO SSOP-16
LTC2804
2+2
1Mbps SD, RA, DD, AO DFN-16
LTC2804-1
2+2
1Mbps
SD, AO SSOP-16
*SD = Shutdown, RA = Receiver Active (low power), DD = Drivers
Disabled, AO = All On
Typical Application
1.8V TO 5.5V
L1
10µH
C4
1µF
OFF ON
V_CC
V_L
PS
MODE
TIN
LTC2802
SW
CAP
TOUT
ROUT
RIN
GND
V_DD
V_EE
C2
1µF
C1
220nF
C3
1µF
2801 TA01a
LTC2802 at 1.8V and 1Mbps
2V/DIV
TIN
5V/DIV
TOUT
2V/DIV
ROUT
V_CC = V_L = 1.8V 400ns/DIV
WRAPPING DATA
TOUT LOAD = 250pF + RIN
ROUT LOAD = 150pF
2801 TA01b
2801234fe