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MAX7325AEG+ Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX7325AEG+ Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 19 page Detailed Description MAX7319–MAX7329 Family Comparison The MAX7324–MAX7327 family consists of four pin- compatible, 16-port expanders that integrate the func- tions of the MAX7320 and one of either MAX7319, MAX7321, MAX7322, or MAX7323. Functional Overview The MAX7325 is a general-purpose port expander oper- ating from a +1.71V to +5.5V supply with eight push-pull outputs and eight open-drain I/O ports. Each open-drain output is rated to sink 20mA, and the entire device is rated to sink 100mA into all ports combined. The outputs drive loads connected to supplies up to +5.5V. The MAX7325 is set to two of 32 I2C slave addresses (see Tables 2 and 3) using the address select inputs AD0 and AD2, and is accessed over an I2C serial inter- face up to 400kHz. The eight outputs and eight I/Os have different slave addresses. The eight push-pull out- puts have the 101xxxx addresses and the eight inputs have addresses with 110xxxx. The RST input clears the serial interface in case of a bus lockup, terminating any serial transaction to or from the MAX7325. Configure any port as a logic input by setting the port output logic-high (logic-high for an open-drain output is high impedance). When the MAX7325 is read through the serial interface, the actual logic levels at the ports are read back. I2C Port Expander with 8 Push-Pull and 8 Open-Drain I/Os _______________________________________________________________________________________ 5 PART I2C SLAVE ADDRESS INPUTS INPUT INTERRUPT MASK OPEN- DRAIN OUTPUTS PUSH- PULL OUTPUTS CONFIGURATION 16-PORT EXPANDERS MAX7324 8 Yes — 8 8 input and 8 push-pull output versions: 8 input ports with programmable latching transition detection interrupt and selectable pullups. 8 push-pull outputs with selectable default logic levels. Offers maximum versatility for automatic input monitoring. An interrupt mask selects which inputs cause an interrupt on transitions, and transition flags identify which inputs have changed (even if only for a transient) since the ports were last read. MAX7325 101xxxx and 110xxxx Up to 8 — Up to 8 8 8 I/O and 8 push-pull output versions: 8 open-drain I/O ports with latching transition detection interrupt and selectable pullups. 8 push-pull outputs with selectable default logic levels. Open-drain outputs can level shift the logic-high state to a higher or lower voltage than V+ using external pullup resistors, but pullups draw current when output is low. Any open-drain port can be used as an input by setting the open-drain output to logic- high. Transition flags identify which open-drain port inputs have changed (even if only for a transient) since the ports were last read. Table 1. MAX7319–MAX7329 Family Comparison |
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