MAX4518 Maxim, MAX4518 Datasheet - Page 8

• Manufacturer Part Number: MAX4518
• Description: The MAX4518/MAX4519 precision, monolithic, CMOS analog multiplexers (muxes) offer low on-resistance (less than 100Ω), which is matched to within 4Ω between channels and remains flat over the specified analog signal range (10Ω max)
• Manufacturer: Maxim

Using supply voltages less than ±5V reduces the analog
signal range. The MAX4518/MAX4519 muxes operate
with ±2.7V to ±8V bipolar supplies or with a +2.7V to
+15V single supply. Connect V- to GND when operating
with a single supply. Both device types can also operate
with unbalanced supplies, such as +10V and -5V. The
Typical Operating Characteristics graphs show typical
on-resistance with ±3V, ±5V, +3V and +5V supplies.
(Switching times increase by a factor of two or more for
operation at 5V.)
Proper power-supply sequencing is recommended for
all CMOS devices. Do not exceed the absolute maxi-
mum ratings, because stresses beyond the listed rat-
ings can cause permanent damage to the devices.
Always sequence V+ on first, then V-, followed by the
logic inputs, NO, or COM. If power-supply sequencing
is not possible, add two small signal diodes (D1, D2) in
series with supply pins for overvoltage protection
(Figure 1). Adding diodes reduces the analog signal
range to one diode drop below V+ and one diode drop
Precision, 4-Channel/Dual 2-Channel,
Low-Voltage, CMOS Analog Multiplexers
Figure 2. Transition Time
8
______________________________________________Test Circuits/Timing Diagrams
__________Applications Information
_______________________________________________________________________________________
V+
V+
Operation with Supply Voltages
50
50
EN
EN
A1
A1
A0
A0
GND
GND
COMA, NO1A–NO2A
MAX4519
MAX4518
Overvoltage Protection
+5V
+5V
V+
V+
NO2–NO3
-5V
-5V
V-
V-
COMB
NO1B
NO2B
COM
NO1
NO4
Other than ±5V
300
300
-5V
+5V
+5V
-5V
35pF
35pF
V
V
OUT
OUT
Figure 1. Overvoltage Protection Using External Blocking Diodes
above V-, but does not affect the devices’ low switch
resistance and low leakage characteristics. Device
operation is unchanged, and the difference between
V+ and V- should not exceed 17V. These protection
diodes are not recommended when using a single supply.
SWITCH
OUTPUT
LOGIC
INPUT
V
V
V
EN
NO1A
V
OUT
NO4
COM
, V
, V
NO1B
NO2B
+3V
0V
0V
*
*
t
V-
TRANS
V+
50%
-5V
+5V
D1
D2
90%
* INTERNAL PROTECTION DIODES
*
*
t
TRANS
MAX4518
MAX4519
t
t
R
F
90%
< 20ns
< 20ns
NO