Datasheet

MAX5400/MAX5401
256-Tap SOT-PoT,
Low-Drift Digital Potentiometers in SOT23
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Note 1: Linearity is defined in terms of the H to L code-dependent resistance.
Note 2: The DNL and INL are measured with the potentiometer configured as a voltage-divider with H = V
DD
and L = 0. The wiper
terminal is unloaded and measured with an ideal voltmeter.
Note 3: The DNL and INL are measured with the potentiometer configured as a variable resistor. H is unconnected and L = 0. The
wiper terminal is driven with a source current of 80µA for the 50kΩ configuration and 40µA for the 100kΩ configuration.
Note 4: The wiper resistance is measured assuming the source currents given in Note 2.
Note 5: Digital timing is guaranteed by design.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DIGITAL INPUTS
Input High Voltage V
IH
V
CC
= 5V 0.7
✕
V
DD
V
Input Low Voltage V
IL
V
CC
= 5V 0.3
✕
V
DD
V
Input High Voltage V
IH
V
CC
= 3V 0.7
✕
V
DD
V
Input Low Voltage V
IL
V
CC
= 3V 0.3
✕
V
DD
V
Input Leakage Current ±1.0 µA
Input Capacitance 5.0 pF
TIMING CHARACTERISTICS (Voltage Divider Mode)
MAX5400 (to 50% of final value, from code 0
to code 128)
300
Wiper Settling Time t
IL
MAX5401 (to 50% of final value, from code 0
to code 128)
600
ns
TIMING CHARACTERISTICS (Digital) (Note 5)
SCLK Clock Period t
CP
100 ns
SCLK Pulse Width High t
CH
40 ns
SCLK Pulse Width Low t
CL
40 ns
CS Fall to SCLK Rise Setup
Time
t
CSS
40 ns
SCLK Rise to CS Rise Hold Time t
CSH
0ns
DIN Setup Time t
DS
40 ns
DIN Hold Time t
DH
0ns
SCLK Rise to CS Fall Delay t
CS0
10 ns
CS Rise to SCLK Rise Hold t
CS1
40 ns
CS Pulse Width High t
CSW
100 ns
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +5V, V
H
= V
DD
, V
L
= 0, T
A
= T
MIN
to T
MAX
. Typical values are at T
A
= +25°C, unless otherwise noted. Parameters are mea-
sured at T
A
= +25°C. Values over full temperature range are guaranteed by design.)