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+3.3V/+5V, 8-Channel Relay Drivers with Fast
Recovery Time and Power-Save Mode
MAX4822/MAX4823 Pin Description
PIN
MAX4822
MAX4823
NAME
FUNCTION
Reset Input. Drive RESET low to clear all latches and registers (all outputs are high
1
1
RESET
impedance). RESET overrides all other inputs. If RESET and SET are pulled low at the
same time, then RESET takes precedence.
Chip-Select Input. Drive CS low to select the device. When CS is low, data at DIN is
2
2
CS
clocked into the shift register on SCLK’s rising edge. Drive CS from low to high to latch
the data to the registers and activate the relay outputs.
3
4
3
4
DIN
SCLK
Serial Data Input
Serial Clock Input
Serial Data Output. DOUT is the output of the shift register. DOUT can be used to daisy-
5
5
DOUT
chain multiple MAX4822/MAX4823 devices. The data at DOUT appears synchronous to
SCLK’s falling edge.
6
7
8
9
10, 16
11
12
6, 13
7
8
9
10, 16
11
12
N.C.
GND
OUT8
OUT7
PGND
OUT6
OUT5
No Connection. Not internally connected.
Ground
Open-Drain Output 8. Connect OUT8 to the low side of a relay coil. This output is pulled
to PGND when activated, but otherwise is high impedance.
Open-Drain Output 7. Connect OUT7 to the low side of a relay coil. This output is pulled
to PGND when activated, but otherwise is high impedance.
Power Ground. PGND is a return for the output sinks. Connect PGND pins together and
to GND.
Open-Drain Output 6. Connect OUT6 to the low side of a relay coil. This output is pulled
to PGND when activated, but otherwise is high impedance.
Open-Drain Output 5. Connect OUT5 to the low side of a relay coil. This output is pulled
to PGND when activated, but otherwise is high impedance.
Power-Save Control. Connect a timing capacitor from PSAVE to ground. The capacitor
value determines power-save timing as explained under the Applications Information
13
—
PSAVE
section. PSAVE can also be driven externally to control power-save mode
asynchronously. When asserted high, PSAVE reduces the current to all active outputs as
determined by the Power-Save Configuration Register (see Figure 1). To disable power-
save mode in all channels, drive PSAVE low for at least 3ms after the last output setting.
14
15
17
18
14
15
17
18
OUT4
OUT3
OUT2
OUT1
Open-Drain Output 4. Connect OUT4 to the low side of a relay coil. This output is pulled
to PGND when activated, but otherwise is high impedance.
Open-Drain Output 3. Connect OUT3 to the low side of a relay coil. This output is pulled
to PGND when activated, but otherwise is high impedance.
Open-Drain Output 2. Connect OUT2 to the low side of a relay coil. This output is pulled
to PGND when activated, but otherwise is high impedance.
Open-Drain Output 1. Connect OUT1 to the low side of a relay coil. This output is pulled
to PGND when activated, but otherwise is high impedance.
_______________________________________________________________________________________
7
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