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DG529DK中文资料

_______________General Description

Maxim’s DG528/DG529 are monolithic, 8-channel,CMOS multiplexers with on-board address and control latches that simplify design and reduce board space in microprocessor-based applications. The DG528 is a single-ended, 1-of-8 multiplexer, while the DG529 is a differential, 2-of-8 multiplexer. These devices can oper-ate as multiplexers or demultiplexers.

The DG528/DG529 have break-before-make switching to prevent momentary shorting of the input signals.Each device operates with dual supplies (±4.5V to ±20V) or a single supply (+5V to +30V). All logic inputs are TTL and CMOS compatible. The Maxim DG528/DG529 are pin and electrically compatible with the industry-standard DG528/DG529.

________________________Applications

Data-Acquisition Systems Automatic Test Equipment Avionics and Military Systems Communication Systems

Microprocessor-Controlled Systems Audio-Signal Multiplexing

____________________________Features

o Low-Power, Monolithic CMOS Design o On-Board Address Latches o Break-Before-Make Input Switches o TTL and CMOS Logic Compatible o Microprocessor-Bus Compatible o r DS(ON)< 400?

o Pin and Electrically Compatible with the Industry-Standard DG528/DG529 and ADG528/ADG529

DG528/DG529

8-Channel Latchable Multiplexers

________________________________________________________________Maxim Integrated Products

_________________Pin Configurations

__________Typical Operating Circuit

Call toll free 1-800-998-8800 for free samples or literature.

19-3519; Rev 0; 3/91

D G 528/D G 529

8-Channel Latchable Multiplexers 2

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V+ = 15V, V- = -15V, V EN = 2.4V, WR = 0V, RS = 2.4V, T A = T MIN to T MAX , unless otherwise noted.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Voltage Referenced to V-V+....................................................................................+44V GND.................................................................................+25V Digital Inputs V S , V D.................................................V- -2V to V+ +2V

or 20mA, whichever occurs first.

Current (any terminal, except S or D).................................30mA Continuous Current, S or D

Peak Current, S or D...........................................................20mA (pulsed at 1ms, 10% duty cycle max)............................50mA Continuous Power Dissipation (T A = +70°C) (Note 1)

18-Pin Plastic DIP (derate 11.11mW/°C above +70°C)...889mW 18-Pin Wide SO (derate 9.52mW/°C above +70°C)....762mW 18-Pin CERDIP (derate 10.53mW/°C above +70°C)....842mW 20-Pin PLCC (derate 10.00mW/°C above +70°C).......800mW 20-Pin LCC (derate 9.09mW/°C above +70°C)...........727mW Operating Temperature Ranges

DG52_C_............................................................0°C to +70°C DG52_D_/E_....................................................-40°C to +85°C DG52_A_.......................................................-55°C to +125°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10sec).............................+300°C

Note 1:All leads are soldered or welded to PC board.

DG528/DG529

8-Channel Latchable Multiplexers

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Note 2:Guaranteed by design.Note 3:Sequence each switch on.

Note 4:I D(ON)is leakage from driver into on switch.

Note 5:

Reset pulse period must be at least 50μs during or after power-on.

ELECTRICAL CHARACTERISTICS

(V+ = 15V, V- = -15V, V EN = 2.4V, WR = 0V, RS = 2.4V, T A = T MIN to T MAX , unless otherwise noted.)

D G 528/D G 529

8-Channel Latchable Multiplexers 4_______________________________________________________________________________________

Figure 1. Transition-Time Test Circuits

Figure 2. Open-Time (B.B.M.) Interval Test Circuit

DG528/DG529

8-Channel Latchable Multiplexers

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Figure 3. Enable t ON /t OFF Time Test Circuit

Figure 4. Write Turn-On Time t Test Circuit

D G 528/D G 529

8-Channel Latchable Multiplexers 6

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Figure 5. Reset Turn-Off Time t OFF(RS)Test Circuit

Figure 7. Typical Timing Diagrams for DG528/DG529

Figure 6. Charge-Injection Test Circuit

_______________Detailed Description

The internal structures of the DG528/DG529 include translators for the A2/A1/A0/EN/WR/RS digital inputs,latches, and a decode section for channel selection (Truth Tables). The gate structures consist of parallel combinations of N and P MOSFETs.

WRITE (WR) and RESET (RS) strobes are provided for interfacing with μP-bus lines (Figure 9), alleviating the need for the μP to provide constant address inputs to the mux to hold a particular channel.

When the WR strobe is in the low state (less than 0.8V)and the RS strobe is in the high state (greater than 2.4V), the muxes are in the transparent mode—they act similarly to nonlatching devices, such as the DG508A/DG509A or the HI508/HI509.

When the WR goes high, the previous BCD address input is latched and held in that state indefinitely. To pull the mux out of this state, either WR must be taken

low to the transition state, or RS must be taken low to turn off all channels.

RS turns off all channels when it is low, which resets channel selection to the channel 1 mode.

The DG528/DG529 work with both single and dual sup-plies and function over the +5V to +30V single-supply range. For example, with a single +15V power supply,analog signals in the 0V to +15V range can be switched normally. If negative signals around 0V are expected, a negative supply is needed. However, only -5V is needed to normally switch signals in the -5V to +15V range (-5V, +15V supplies). No current is drawn from the negative supply, so Maxim’s MAX635 DC-DC converter is an ideal choice.

The EN latch allows all switches to be turned off under program control. This is useful when two or more DG528s are cascaded to build 16-line and larger ana-log-signal multiplexers.

DG528/DG529

8-Channel Latchable Multiplexers

_______________________________________________________________________________________7

Table 1. DG528 Logic States

Table 2. DG529 Logic States

Note:Logic “1”: V AH ≥2.4V, Logic “0”: V AL ≤0.8V.

D G 528/D G 529

8-Channel Latchable Multiplexers 8_______________________________________________________________________________________

Figure 8. Simplified Internal Structure

_______________________Applications

Operation with Supply Voltages

Other Than ±15V

Maxim guarantees the DG528/DG529 for operation from ±4.5V to ±20V supplies. The switching delays increase by about a factor of two at ±5V, and break-before-make action is preserved.

The DG528/DG529 can operate with a single +5V to +30V supply as well as asymmetrical power supplies like +15V and -5V. The digital threshold will remain approximately 1.6V above the GND pin, and the analog characteristics such as r DS(ON)are determined by the total voltage difference between V+ and V-. Connect V-to 0V when operating with a +5V to +30V single supply.

Digital Interface Levels

The typical digital threshold of both the address lines and EN is 1.6V with a temperature coefficient of approximately -3mV/°C, ensuring compatibility with TTL logic over the temperature range. The digital threshold is relatively independent of the power-supply voltages,going from a typical 1.6V when V+ is 15V to 1.5V typi-cal with V+ = 5V. Therefore, Maxim’s DG528/DG529operate with standard TTL logic levels, even with ±5V power supplies. In all cases, EN’s threshold is the same as the other logic inputs and is referenced to GND.

The digital inputs can also be driven with CMOS logic levels swinging from either V+ to V- or from V+ to GND.The digital input current is just a few nanoamps of leak-age at all input-voltage levels with a guaranteed maxi-mum of 1μA. The digital inputs are protected from ESD by a 30V zener diode between the input and V+ and can be driven ±2V beyond the supplies without draw-ing excessive current.

DG528/DG529

8-Channel Latchable Multiplexers

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Figure 9. Bus Interface

_____________________________________________Pin Configurations (continued)

D G 528/D G 529

8-Channel Latchable Multiplexers 10

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_Ordering Information (continued)

* Contact factory for dice specifications.

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

_________________Chip Topographies

A1A2

GND

V+

S5S6

S70.125" (3.18mm)

0.131" (3.33mm)

V- S1 S2 S3 S4

A1GND

V+S1B S2B S3B

S4B

0.125" (3.18mm)

0.131" (3.33mm)

V- S1A S2A S3A S4A

DG528

DG529

TRANSISTOR COUNT: 200

SUBSTRATE CONNECTED TO V+

TRANSISTOR COUNT: 200

SUBSTRATE CONNECTED TO V+

DG528/DG529

8-Channel Latchable Multiplexers

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________________________________________________________Package Information

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

D G 528/D G 529

8-Channel Latchable Multiplexers implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

12__________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600?1995 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products.

___________________________________________Package Information (continued)