Datasheet

MAX4564
Low-Voltage, Dual-Supply,
SPDT Analog Switch with Enable
8
Maxim Integrated
Detailed Description
The MAX4564 is a dual-supply SPDT CMOS analog
switch. The MAX4564 has break-before-make switch-
ing. The CMOS switch construction provides Rail-to-
Rail
®
signal handling while consuming virtually no
power. Each of the two switches is independently con-
trolled by a TTL/CMOS-level-compatible digital input.
Applications Information
Overvoltage Protection
Do not exceed the absolute maximum ratings because
stresses beyond the listed ratings may cause perma-
nent damage to the device. Proper power-supply
sequencing is recommended for all CMOS devices.
Always sequence V+ on first, then V-, followed by the
logic inputs NO, NC, or COM. If power-supply
sequencing is not possible, add two small-signal
diodes (D1, D2) in series with supply pins. Adding
diodes reduces the analog signal range to one diode
drop below V+ and one diode drop above V-, but does
not affect the device’s low switch resistance and low
leakage characteristics.
Test Circuits/
Timing Diagrams
Pin Description
µMAX
SOT23 NAME FUNCTION
1 8 COM Analog Switch Common
27EN
Device Enable. Drive EN low for normal SPDT switch operation. If EN is high, both
NO and NC are disconnected.
3 6 V- Negative Supply Voltage
4 5 GND Ground
5 3 IN Digital Control Input
6 4 NO Analog Switch Normally Open
7 1 NC Analog Switch Normally Closed
8 2 V+ Positive Supply Voltage
POSITIVE SUPPLY
COM
NO
D2
D1
V-
V
g
V+
MAX456
4
NEGATIVE SUPPLY
Figure 1. Overvoltage Protection Using Two External Blocking
Diodes
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.