ogy. The multiplexers are available in plastic DIP and
plastic SOIC packages. Temperature range is –40°C to
+85°C.
FUNCTIONAL DIAGRAMS
DESCRIPTION
The MPC508A is an 8-channel single-ended analog
multiplexer and the MPC509A is a 4-channel differen-
tial multiplexer.
The MPC508A and MPC509A multiplexers have in-
put overvoltage protection. Analog input voltages may
exceed either power supply voltage without damaging
the device or disturbing the signal path of other chan-
nels. The protection circuitry assures that signal fidel-
ity is maintained even under fault conditions that
would destroy other multiplexers. Analog inputs can
withstand 70Vp-p signal levels and standard ESD
tests. Signal sources are protected from short circuits
should multiplexer power loss occur; each input pre-
sents a 1kΩ resistance under this condition. Digital
inputs can also sustain continuous faults up to 4V
greater than either supply voltage.
These features make the MPC508A and MPC509A
ideal for use in systems where the analog signals
originate from external equipment or separately pow-
ered sources.
Decoder/
Driver
Overvoltage
Clamp and
Signal
Isolation
NOTE: (1) Digital
Input Protection.
MPC508A
5V
Ref
Level
Shift
(1) (1)
(1)
(1)
A
0
A
1
A
2
EN
1kΩ
In 1A
1kΩ
In 4A
1kΩ
In 1B
1kΩ
In 4B
Overvoltage
Clamp and
Signal
Isolation
NOTE: (1) Digital
Input Protection.
MPC509A
Out B
Decoder/
Driver
Out A
5V
Ref
Level
Shift
(1) (1)
(1)
A
0
A
1
EN
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
(3) To drive from DTL/TTL circuits. 1kΩ pull-up resistors to +5.0V supply are recommended.
(4) Digital input leakage is primarily due to the clamp diodes. Typical leakage is less than 1nA at 25°C. (5) V
EN
= 0.8V, R
L
= 1kΩ, C
L
= 15pF, V
S
= 7Vrms, f = 100kHz.
Worst-case isolation occurs on channel 4 due to proximity of the output pins. (6) V
EN
, V
A
= 0V or 4.0V.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN
assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject
to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not
authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.
®
MPC508A, 509A
2
PIN CONFIGURATIONS
Top View
A
0
En
–V
SUPPLY
In 1
In 2
In 3
In 4
Out
1
2
3
4
5
6
7
8
MPC508A (Plastic)
16 A
1
15 A
2
14 Ground
13
+V
SUPPLY
A
0
En
–V
SUPPLY
In 1A
In 2A
In 3A
In 4A
Out A
1
2
3
4
5
6
7
8
Top View
16 A
1
15
Ground
14 +V
SUPPLY
13 In 1B
12 In 2B
11 In 3B
10 In 4B
9
Out B
12 In 5
11 In 6
10 In 7
9
In 8
MPC509 A (Plastic)
TRUTH TABLES
MPC508A
A
2
X
L
L
L
L
H
H
H
H
A
1
X
L
L
H
H
L
L
H
H
A
0
X
L
H
L
H
L
H
L
H
EN
L
H
H
H
H
H
H
H
H
"ON"
CHANNEL
None
1
2
3
4
5
6
7
8
A
1
X
L
L
H
H
A
0
X
L
H
L
H
EN
L
H
H
H
H
MPC509A
"ON"
CHANNEL
PAIR
None
1
2
3
4
ORDERING INFORMATION
ABSOLUTE MAXIMUM RATINGS
(1)
Voltage between supply pins ............................................................... 44V
V+ to ground ........................................................................................ 22V
V– to ground ........................................................................................ 25V
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