MAX349 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers

19-0451; Rev 1; 10/98
Serially Controlled, Low-Voltage,
8-Channel/Dual 4-Channel Multiplexers
General Description ____________________________Features
The MAX349/MAX350 are 8-channel and dual 4-channel
serially controlled multiplexers (muxes). These muxes
conduct equally well in either direction. On-resistance
(100Ω max) is matched between switches to 16Ω max
and is flat (10Ω max) over the specified signal range.
These CMOS devices can operate continuously with
dual power supplies ranging from ±2.7V to ±8V or a sin-
gle supply between +2.7V and +16V. Each mux can
handle rail-to-rail analog signals. The off-leakage current
is only 0.1nA at +25°C or 5nA at +85°C.
Upon power-up, all switches are off and the internal
shift registers are reset to zero.
The serial interface is compatible with SPI™/QSPI™
and MICROWIRE™. Functioning as a shift register, it
allows data (at DIN) to be clocked in synchronously
with the rising edge of clock (SCLK). The shift register’s
output (DOUT) enables several MAX349s or MAX350s
to be daisy chained.
All digital inputs have 0.8V or 2.4V logic thresholds,
ensuring both TTL and CMOS-logic compatibility when
using ±5V supplies or a single +5V supply.
________________________Applications
Serial Data-Acquisition
Systems
Avionics
Industrial and Process-
Control Systems
ATE Equipment
Audio Signal Routing
Networking
o SPI/QSPI, MICROWIRE-Compatible Serial
Interface
o 8 Separately Controlled SPST Switches
o Single 8-to-1 Mux (MAX349)
Dual 4-to-1 Mux (MAX350)
o 100Ω Signal Paths with ±5V Supplies
o Rail-to-Rail^® Signal Handling
o Asynchronous RESET Input
o ±2.7V to ±8V Dual Supplies
+2.7V to +16V Single Supply
o >2kV ESD Protection per Method 3015.7
o TTL/CMOS-Compatible Inputs (with +5V or ±5V
Supplies)
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX349CPN
0°C to +70°C 18 Plastic DIP
MAX349CWN
0°C to +70°C 18 Wide SO
MAX349CAP
0°C to +70°C 20 SSOP
MAX349C/D
0°C to +70°C Dice*
Ordering Information continued at end of data sheet.
*Contact factory for dice specifications.
Pin Configurations/Functional Diagrams
TOP VIEW
SCLK ₁
V+ ₂
DIN ₃
GND ₄
COM ₅
NO0 ₆
NO1 ₇
NO2 ₈
NO3 ₉
MAX349
LOGIC
18 ^CS
17 RESET
16 ^DOUT
15 V-
14 N.C.
13 NO7
12 NO6
11 NO5
10 NO4
SCLK ₁
V+ ₂
DIN ₃
GND ₄
COMA ₅
NO0A ₆
NO1A ₇
NO2A ₈
NO3A ₉
MAX350
LOGIC
18 ^CS
17 RESET
16 ^DOUT
15 V-
14 COMB
13 NO0B
12 NO1B
11 NO2B
10 NO3B
N.C. = NOT INTERNALLY
CONNECTED
DIP/SO
DIP/SO
Pin Configurations continued at end of data sheet.
SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
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