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MAX382 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX382 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 12 page Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers with Latchable Inputs _______________________________________________________________________________________ 7 ______________________________________________________________Pin Description 2, 17 PIN MAX382 MAX384 NAME* FUNCTION 1 WR WRITE Logic Input — 1 A0, A1 Address Logic Inputs (see Truth Tables at end of data sheet) 3 3 EN Enable Logic Input (see Truth Tables at end of data sheet) 4 4 V- Negative Supply Voltage Input. Connect to GND for single-supply operation. 5–8 — NO1–NO4 Analog Signal Inputs—bidirectional — 5–8 NO1A–NO4A Analog Signal Inputs—bidirectional 9 — COM Analog Signal Output—bidirectional — 9, 10 COMA, COMB Analog Signal Outputs—bidirectional 10–13 — NO8–NO5 Analog Signal Inputs—bidirectional — 11–14 NO4B–NO1B Analog Signal Inputs—bidirectional 14 15 V+ Positive Supply Voltage Input 15 16 GND Ground 2, 16, 17 A0, A2, A1 Address Logic Inputs (see Truth Tables at end of data sheet) — 18 18 RS RESET Logic Input __________Applications Information The internal structures of the MAX382/MAX384 include translators for the A2/A1/EN/WR/RS digital inputs, latch- es, and a decode section for channel selection (see Truth Tables). The analog-signal switches consist of parallel combinations of N and P MOSFETs. WRITE (WR) and RESET (RS) strobes are provided for interfacing with µP-bus lines, alleviating the need for the µP to provide constant address inputs to the mux to hold a particular channel (Figures 2–7). 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 similar to nonlatching devices, such as the MAX398/MAX399. When the WR goes high, the previous BCD address input is latched and held in that state indefinitely. RS turns off all channels when it is low. All switches stay off until RS and EN are high and WR is low. The MAX382/MAX384 work with both single and dual supplies and function over the +2.4V to +16V single- supply range. For example, with a single +5V power supply, analog signals in the 0V to +5V range can be switched normally. If negative signals around 0V are expected, a negative supply is needed. The EN latch allows all switches to be turned off under program control. This is useful when two or more are cascaded to build 16-line and larger analog-signal mul- tiplexers. *Analog inputs and outputs are names of convenience only. Inputs and outputs are identical and interchangeable. |
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