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MAX4820/MAX4821
3.3V/+5V, 8-Channel, Cascadable Relay Drivers
with Serial/Parallel Interface
Typical Operating Characteristics (continued)
(V COM = V CC , T A = -40°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C.)
2.50
2.25
INPUT LOGIC THRESHOLD
vs. SUPPLY VOLTAGE
BACK EMF CLAMPING
WITH STANDARD 3V RELAY
MAX4820 toc11
V CS
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0
0
OUT_ TURNS OFF
V CC = 3.3V
5V/div
OUT_
1V/div
2.3
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
200 μ s/div
SUPPLY VOLTAGE (V)
Pin Description
PIN
MAX4820
MAX4821
NAME
FUNCTION
THIN
QFN
TSSOP
THIN
QFN
TSSOP
Reset Input. Drive RESET low to clear all latches and registers (all outputs
1
3
1
3
RESET
are turned off). RESET overrides all other inputs. If RESET and SET are pulled
low at the same time, then RESET takes precedence.
Chip-Select Input.
MAX4820: Drive CS low to select the device. When CS is low, data at DIN is
2
4
2
4
CS
clocked into the 8-bit shift register on SCLK’s rising edge. Drive CS from low
to high to latch the data to the registers and activate the appropriate relays.
MAX4821: Drive CS low to select the device and set level on LVL. Drive CS
from low to high to latch the address and level data to the output.
3
4
5
6
—
—
—
—
DIN
SCLK
Serial-Data Input
Serial-Clock Input
Serial-Data Output. DOUT is the output of the 8-bit shift register. This output
5
7
—
—
DOUT
can be used to daisy chain multiple MAX4820s. The data at DOUT appears
synchronous to SCLK’s falling edge.
6
7
8
9
10, 16
11
8
9
10
11
12, 18
13
—
7
8
9
10, 16
11
—
9
10
11
12, 18
13
N.C.
GND
OUT8
OUT7
PGND
OUT6
No Connection
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.
Maxim Integrated
5
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