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Linear Technology Electronic Components Datasheet

LTC221CN Datasheet

Quad CMOS Analog Switches

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LTC221/LTC222
Micropower, Low Charge
Injection, Quad CMOS Analog
Switches with Data Latches
FEATURES
Micropower Operation
Single 5V or ±15V Supply Operation
Low Charge Injection
Low RON
Low Leakage
Guaranteed Break Before Make
Latch Resistant Design
TLL/CMOS Compatible
Improved Second Source for DG221/DG222
Microprocessor Bus Compatible
U
KEY SPECIFICATIO S
Supply Current ..................... I+ = 40µA, I= 5µA Max
Charge Injection
±15V Supplies ................................. ±25pC Max
Single 5V Supply .................................. 2pC Typ
RON ............................................................... 65Typ
Signal Range ..................................................... ±15V
DESCRIPTIO
The LTC®221 and LTC222 are micropower, quad CMOS
analog switches which typically dissipate only 250µW
from ±15V supplies and 40µW from a single 5V supply.
Onboard latches allow the LTC221 and LTC222 to inter-
face directly to most microprocessor buses. The switches
have 65typical on resistance and a very high off resis-
tance. A break before make characteristic is inherent in
these switches to prevent the shorting of two channels.
The signal range is ±15V with a supply voltage of ±15V and
0V to 5V with a single 5V supply. The switches have special
charge compensation circuitry which greatly reduces
charge injection to a maximum of ±25pC (±15V supplies).
The LTC221 and LTC222 are designed for applications
such as microprocessor controlled programmable gain
amplifiers, automatic test equipment, communication
systems, and data acquisition systems. The LTC221 is
normally closed and the LTC222 is normally open as
shown in the Logic Table.
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATIO
Two-Channel, 12-Bit, Self Calibrating Data Acquisition System
LTC221/LTC222
WR
V+
5V
IN4
GND
IN3
V
IN2
IN1
VFS S1
D1
S2
D2
VIN
OV TO 5V
S3
D3
S4
D4
LOGIC
DECODER
ADDRESS BUS
DATA BUS B0 – B3
15V
5V
LT1006
10k IN
150k
–IN
GND
120
–15V
LTC1292 CLK
12-BIT
ADC
DOUT
CS
R1 VREF
SERIAL PORT
100k
270
LT1027
VFS
WR
TO MICROPROCESSOR
e.g. TMS320C25
15V
LTC221/222 • TA01
2212fa
1


Linear Technology Electronic Components Datasheet

LTC221CN Datasheet

Quad CMOS Analog Switches

No Preview Available !

LTC221/LTC222
UW U
ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO
(Note 1)
Voltages Referenced to V
V+ ........................................................................................... 44V
GND ..................................................................... 25V
Digital Inputs, S, D (Note 2) .......... – 2V to (V+ 2V) or
Digital Inputs, S, D (N2020mA, Whichever Occurs First
Current
Any Input Except S or D ................................... 30mA
Continuous S or D ............................................ 20mA
Peak S or D
(Pulsed at 1 ms, 10% Duty Cycle Max) ......... 70mA
ESD Susceptibility (Note 3) ...................................... 4kV
Power Dissipation (Plastic) ............................... 500mW
Power Dissipation (Ceramic) ............................. 900mW
Operating Temperature Range
LTC221C/LTC222C .................................. 0°C to 70°C
LTC221M/LTC222M (OBSOLETE).......–55°C to 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
IN1 1
D1 2
S1 3
V4
GND 5
S4 6
D4 7
IN4 8
TOP VIEW
16 IN2
15 D2
14 S2
13 V+
12 WR
11 S3
10 D3
9 IN3
ORDER PART
NUMBER
LTC221CN
LTC221CS
LTC222CN
LTC222CS
N PACKAGE
16-LEAD PDIP
JMAX = 110°C, θJA = 120°C/W
S PACKAGE
16-LEAD PLASTIC SO
JMAX = 110°C, θJA = 130°C/W
J PACKAGE
16-LEAD CERDIP
OBSOLETE PACKAGE
Consider the N or S Package for Alternate Source
LTC221MJ
LTC221CJ
LTC222MJ
LTC222CJ
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LOGIC TABLE
INX WR
LTC221
LTC222
0
0
On
Off
1
0
Off
On
X
1 Maintain Previous State Maintain Previous State
U
DIGITAL A D DC ELECTRICAL CHARACTERISTICS The denotes the specifications which apply
over full operating temperature range, otherwise specifications are at TA = 25°C. V+ = ±15V, V= –15V, GND = 0V, unless noted.
LTC221M/LTC222M
LTC221C/LTC222C
PARAMETER
CONDITIONS
MIN TYP MAX MIN TYP MAX UNITS
Analog Signal Range
RON
Off Input Leakage IS (OFF)
VS = ±10V
TMIN
ID = 1mA
25°C
TMAX
VD = 14V, VS = ±14V
Off Output Leakage ID (0FF)
On Channel Leakage lD (ON)
Input High Voltage VINH, VWRH
Input Low Voltage VINL, VWRL
Input High or Low Current
IINH, IINL, IWRH, IWRL
CS (OFF)
CD (OFF)
CD, CS (ON)
I+
VIN = 2.4V, LTC221
VIN = 0.8V, LTC222
VD = VS = ±14V, VIN = 2.4V, LTC222
VIN = 0.8V, LTC221
VIN = 15V, 0V
VWR = 15V, 0V
All Channels On or Off
VIN = VWR = 0V or 4.0V
±15
±15
V
90
90
65
90
65 90
135
135
0.01
±1
0.01 ±5
nA
±100
±100 nA
0.01
±1
0.01 ±5
nA
±100
±100 nA
0.02
±1
0.02 ±5
nA
±200
±200 nA
2.4
2.4
V
0.8
0.8
V
±1
±1
µA
5
5
pF
12
12
pF
30
30
pF
16
40
16 40
µA
60
60
µA
2212fa
2


Part Number LTC221CN
Description Quad CMOS Analog Switches
Maker Linear Technology
PDF Download

LTC221CN Datasheet PDF






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