Datasheet
__________Applications Information
Operation with
Supply Voltages Other than 15V
Using supply voltages less than ±15V will reduce the
analog signal range. The MAX338/MAX339 switches
operate with ±4.5V to ±20V bipolar supplies or with a
+4.5V to +30V single supply. Connect V- to GND when
operating with a single supply. Both device types can
also operate with unbalanced supplies such as +24V
and -5V. The
Typical Operating Characteristics
graphs
show typical on-resistance with 20V, 15V, 10V, and 5V
supplies. (Switching times increase by a factor of two
or more for operation at 5V.)
Overvoltage Protection
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 may cause permanent damage to the devices.
Always sequence V+ on first, then V-, followed by the
logic inputs NO and COM. If power-supply sequencing
is not possible, add two small signal diodes in series
with supply pins for overvoltage protection (Figure 1).
Adding diodes reduces the analog signal range to 1V
below V+ and 1V above V-, but does not affect the
devices’ low switch resistance and low leakage charac-
teristics. Device operation is unchanged, and the differ-
ence between V+ and V- should not exceed 44V.
MAX338/MAX339
8-Channel/Dual 4-Channel,
Low-Leakage, CMOS Analog Multiplexers
6 _______________________________________________________________________________________
______________________________________________________________Pin Description
V
g
NO
COM
V-
V+
Figure 1. Overvoltage Protection Using External Blocking
Diodes
PIN
MAX338 MAX339
DIP/SO/QSOP TQFN-EP DIP/SO/QSOP TQFN-EP
NAME FUNCTION
1, 15, 16, 15, 14, 13 — — A0, A2, A1 Address Inputs
— — 1, 16 15, 14 A0, A1 Address Inputs
2 16 2 16 EN Enable
3 1 3 1 V- Negative-Supply Voltage Input
4–7 2–5 — — NO1–NO14 Analog Inputs—Bidirectional
— — 4–7 2–5 NO1A–NO4A Analog Inputs—Bidirectional
8 6 — — COM Analog Output—Bidirectional
— — 8, 9 6, 7 COMA, COMB Analog Outputs—Bidirectional
9–12 7–10 — — NO8–NO5 Analog Inputs—Bidirectional
— — 10–13 8–11 NO4B–NO1B Analog Inputs—Bidirectional
13 11 14 12 V+ Positive-Supply Voltage Input
14 12 15 13 GND Ground
— — — — Exposed Pad
Exposed Pad (TQFN only). Connect EP to
V+.