MAX1608 Datasheet, PDF (5/16 Pages) Maxim Integrated Products – Octal SMBus-to-Parallel I/O Expanders

Octal SMBus-to-Parallel I/O Expanders
Typical Operating Characteristics (continued)
(V+ = +5V, T_A = +25°C, unless otherwise noted.)
ALERT DELAY
(IO_ FALLING)
MAX1608
IO_ POWER-UP RESPONSE
PULL-UP = 10kΩ to V+
IO_
2V/div
V_{IO_}
500mV/div
PIN
1– 8
9
10, 11
12
13
14
15
16
IO_ DRIVEN EXTERNALLY
200ns/div
NAME
IO0– IO7
GND
ADD0, ADD1
SMBDATA
ALERT
SMBCLK
SMBSUS
V+
ALERT
5V/div
V+
2V/div
Pin Description
FUNCTION
Combined Input/Output. Open-drain output. Can withstand +28V.
Ground
SMBus Address Select. See Table 1.
SMBus Serial-Data Input/Output. Open-drain output. Requires external pull-up resistor.
Active-Low Interrupt Output. Open-drain output. Requires external pull-up resistor.
SMBus Serial Clock Input
SMBus Suspend-Mode Control Input. The device will enter the state previously stored in
the suspend-mode registers if low, or enter the state previously stored in the normal-mode
registers if high.
Supply Voltage Input, +2.7V to +5.5V. Bypass to GND with a 0.1µF capacitor.
Detailed Description
The MAX1608/MAX1609 convert 2-wire SMBus serial
data into eight latched parallel outputs (IO0–IO7). These
devices are intended for general-purpose remote I/O
expansion. Each device has eight high-voltage open-
drain outputs that double as TTL-level logic inputs.
Typical applications range from high-side MOSFET load-
switch drivers in power-management systems, to push-
button switch monitors, to general-purpose digital I/Os.
The MAX1608/MAX1609 include two complete sets of
registers, each consisting of one output data register to
set the output states and two interrupt mask registers.
The SMBSUS line selects which set of registers control
the device state. The input register is used to perform
readback of the actual IO states.
The MAX1608/MAX1609 operate from a single +2.7V
to +5.5V supply with a typical quiescent current of
2.5µA, making them ideal for portable applications.
Additionally, the devices include an ALERT function to
alert the master of change of condition (Figure 1).
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