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_______________General Description

The MAX335 analog switch with serial digital interface

offers eight separately controlled single-pole-single-

throw (SPST) switches. All switches conduct equally in

either direction, and on-resistance (100W) is constant

over the analog signal range.

These CMOS switches can operate continuously with

power supplies ranging from ±4.5V to ±20V and handle

rail-to-rail analog signals. Upon power-up, all switches are

off, and the internal serial and parallel shift registers are

reset to zero. The MAX335 is equivalent to two DG211

quad switches but controlled by a serial interface.

The interface is compatible with the Motorola SPI inter-

face standard. Functioning as a shift register, this serial

interface allows data (at DIN) to be locked in synchro-

nous with the rising edge of clock (SCLK). The shift reg-

ister's output (DOUT) enables several MAX335s to be

daisy chained.

________________________Applications

Serial Data Acquisition and Process Control

Avionics

Signal Routing

Networking

____________________________Features

♦ 8 Separately Controlled SPST Switches

♦ SPI-Compatible Serial Interface

♦ Accepts ±15V Analog Swings

♦ Multiple Devices Can Be Daisy Chained

______________Ordering Information

MAX335

Serial Controlled, 8-Channel SPST Switch

________________________________________________________________

Maxim Integrated Products

SCLK

V+

DIN

GND

NO0

COM0

NO1

COM1

NO2

COM2

NO3

COM3

DIP/SO

TOP VIEW

MAX335

DOUT

V-

NO7

COM7

NO6

COM6

NO5

COM5

NO4

COM4

__________________Pin Configuration

19-0220; Rev 3; 10/03

LATCH

NO0

COM0

8-BIT SHIFT REGISTER

CLOCK TRANSLATOR

CS TRANSLATOR

+5V TRANSLATOR

SCLK

NO7

COM7

PARALLEL REGISTER AND TRANSLATOR

DOUT

MAX335

* Contact factory for dice specifications.

** Contact factory for availability and processing to MIL-STD-883.

PART TEMP RANGE PIN-PACKAGE

MAX335CNG 0°C to +70°C 24 Narrow Plastic DIP

MAX335CWG 0°C to +70°C 24 Wide SO

MAX335C/D 0°C to +70°C Dice*

MAX335ENG -40°C to +85°C 24 Narrow Plastic DIP

MAX335EUG -40°C to +85°C 24 TSSOP

MAX335EWG -40°C to +85°C 24 Wide SO

MAX335MRG -55°C to +125°C 24 Narrow CERDIP**

Summary of content (13 pages)

PAGE 1
9-0220; Rev 3; 10/03 Serial Controlled, 8-Channel SPST Switch The MAX335 analog switch with serial digital interface offers eight separately controlled single-pole-singlethrow (SPST) switches. All switches conduct equally in either direction, and on-resistance (100W) is constant over the analog signal range. These CMOS switches can operate continuously with power supplies ranging from ±4.5V to ±20V and handle rail-to-rail analog signals.
PAGE 2
MAX335 Serial Controlled, 8-Channel SPST Switch ABSOLUTE MAXIMUM RATINGS Voltages Referenced to VV+...........................................................................................44V GND .......................................................................................25V VL .....................................................(GND - 0.3V) to (V+ + 0.3V) SCLK, CS, DIN, DOUT, NO_, COM_ ...............V- -2V to V+ +2V or 30mA, whichever occurs first Continuous Current (any terminal) .........
PAGE 3
Serial Controlled, 8-Channel SPST Switch (VL = +5V ±10%, V+ = 15V, V- = -15V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER DIGITAL I/O DOUT Output Voltage Logic Low SYMBOL VDOUT CONDITIONS MIN TYP IDOUT = -1.6mA VL RESET Voltage VLL VL RESET Voltage VLH TA = +25°C SCLKHYST TA = +25°C 100 200 SCLK Input Hysteresis (Note 2) MAX UNITS 0.4 V 0.8 V 2.
PAGE 4
MAX335 Serial Controlled, 8-Channel SPST Switch TIMING CHARACTERISTICS OF SERIAL DIGITAL INTERFACE (Figure 1) (VL = +5V ±10%, V+ = +15V, V- = -15V, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER SCLK Maximum Frequency SYMBOL fSCLK CONDITIONS MIN 2.
PAGE 5
Serial Controlled, 8-Channel SPST Switch RON vs. VCOM AND TEMPERATURE 500 200 RON (Ω) B 150 C 100 C B 150 A 400 300 100 200 50 100 tON D 0 0 -20 -10 0 0 -20 20 10 -10 0 DATA-HOLD TIME vs. POWER-SUPPLY VOLTAGE 20 10 200 20 ON-LEAKAGE (pA) ON DATA-SETUP TIME (ns) -20 40 30 20 -40 10 -60 ±5 ±10 2 OFF 0.2 0.02 0.002 0 ±20 ±15 20 15 LEAKAGE CURRENT vs. TEMPERATURE MAX335-05 MAX335-04 0 10 DATA-SETUP TIME vs.
PAGE 6
MAX335 Serial Controlled, 8-Channel SPST Switch _____________________Pin Description PIN NAME FUNCTION 1 SCLK 2 V+ Positive Supply Voltage 3 DIN Serial Data Input 4 GND Ground 5 NOØ Switch 0 6 COMØ Switch 0 7 NO1 Switch 1 8 COM1 Switch 1 Serial Clock Input 9 NO2 Switch 2 10 COM2 Switch 2 11 NO3 Switch 3 12 COM3 Switch 3 13 COM4 Switch 4 14 NO4 Switch 4 15 COM5 Switch 5 16 NO5 Switch 5 17 COM6 Switch 6 18 NO6 Switch 6 19 COM7 Switch 7 20 NO7 Swit
PAGE 7
Serial Controlled, 8-Channel SPST Switch MAX335 tCLL CS tCSH2 ••• tCSS tCH tOFF tCSH0 ••• SCLK tCL tDS tCSH1 tDH ••• DIN tDO ••• DOUT ••• Figure 1. Timing Diagram SWITCHES UPDATED CS SCLK DATA CLOCKED IN DIN D7 D6 D5 D4 D3 D2 D1 D0 LSB MSB INPUT DATA BITS DATA CLOCKED OUT DOUT D7 D6 D5 D4 D3 D2 D1 D0 D7 DATA BITS FROM PREVIOUS DATA INPUT DOUT POWER-UP DEFAULT: D7–D0 = 0 Figure 2.
PAGE 8
MAX335 Serial Controlled, 8-Channel SPST Switch Table 1.
PAGE 9
Serial Controlled, 8-Channel SPST Switch SCLK MAX335 DIN DIN CS CS SCLK MAX335 DOUT DIN MAX335 SCLK SCLK DOUT CS MAX335 DIN DOUT CS TO OTHER SERIAL DEVICES Figure 5. Daisy-Chained Connection DIN SCLK CS1 CS2 TO OTHER SERIAL DEVICES CS3 CS CS CS MAX335 MAX335 MAX335 SCLK SCLK SCLK DIN DIN DIN Figure 6.
PAGE 10
MAX335 Serial Controlled, 8-Channel SPST Switch __________Applications Information 8 x 1 Multiplexer To use the MAX335 as an 8 x 1 multiplexer, tie all drains together (COM0 to COM7); the mux inputs now source each switch (NO0 to NO7). Input a single 0V to +3V pulse at DIN. As this is clocked through the register by SCLK, each switch will sequence on one at a time.
PAGE 11
Serial Controlled, 8-Channel SPST Switch DIM A A1 A2 A3 B B1 C D D1 E E1 e eA eB L α D1 E E1 D A2 A A3 α A1 C B1 eA B eB DIM E MILLIMETERS MIN MAX – 5.08 0.38 – 3.18 3.81 1.40 2.03 0.41 0.56 1.27 1.65 0.20 0.30 31.37 32.13 1.27 2.03 7.62 8.26 6.10 7.11 2.54 BSC 7.62 BSC – 10.16 2.92 3.81 0˚ 15˚ 21-337A L e INCHES MAX MIN 0.200 – – 0.015 0.150 0.125 0.080 0.055 0.022 0.016 0.065 0.050 0.012 0.008 1.265 1.235 0.080 0.050 0.325 0.300 0.280 0.240 0.100 BSC 0.300 BSC 0.400 – 0.150 0.
PAGE 12
MAX335 Serial Controlled, 8-Channel SPST Switch ___________________________________________Package Information (continued) DIM S1 S E1 E D A A B B1 C D E E1 e L L1 Q S S1 a INCHES MAX MIN 0.200 – 0.023 0.014 0.065 0.038 0.015 0.008 1.280 – 0.310 0.220 0.320 0.290 0.100 BSC 0.200 0.125 – 0.150 0.060 0.015 0.098 – – 0.005 15˚ 0˚ MILLIMETERS MIN MAX – 5.08 0.36 0.58 0.97 1.65 0.20 0.38 – 32.51 5.59 7.87 7.37 8.13 2.54 BSC 3.18 5.08 3.81 – 0.38 1.52 – 2.49 0.
PAGE 13
MAX335 Serial Controlled, 8-Channel SPST Switch ___________________________________________Package Information (continued) Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.