Datasheet

MAX5477/MAX5478/MAX5479
Dual, 256-Tap, Nonvolatile, I
2
C-Interface,
Digital Potentiometers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +5.25V, H_ = V
DD
, L_ = GND, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
DD
= +5V,
T
A
= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Dual Code Matching
R0 and R1 set to same code
(all codes), V
DD
= 3V or 5V
±3 LSB
DC PERFORMANCE (RESISTOR CHARACTERISTICS)
Wiper Resistance R
W
(Note 5) 325 675 
Wiper Capacitance C
W
10 pF
MAX5477 7.5 10 12.5
MAX5478 37.5 50 62.5
End-to-End Resistance R
HL
MAX5479 75 100 125
k
DIGITAL INPUTS
V
DD
= 3.4V to 5.25V 2.4
Input High Voltage (Note 6) V
IH
V
DD
< 3.4V 0.7 x V
DD
V
Input Low Voltage V
IL
(Note 6) 0.8 V
Output Low Voltage V
OL
I
SINK
= 3mA 0.4 V
WP Pullup Resistance I
WP
255 k
Input Leakage Current I
LEAK
±1 µA
Input Capacitance 5 pF
DYNAMIC CHARACTERISTICS
Crosstalk
HA = 1kHz (0 to V
DD
), LA = GND,
LB = GND, measure WB
-75 dB
MAX5477 400
MAX5478 100
3dB Bandwidth (Note 7)
MAX5479 50
kHz
Total Harmonic Distortion Plus
Noise
THD+N
H_ = 1V
RMS
, f = 1kHz, L_ = GND,
measure W_
0.003 %
NONVOLATILE MEMORY RELIABILITY
Data Retention T
A
= +85°C 50 Years
T
A
= +25°C 200,000
Endurance
T
A
= +85°C 50,000
Stores
POWER SUPPLY
Power-Supply Voltage V
DD
2.70 5.25 V
Writing to EEPROM, digital inputs at
GND or V
DD
, T
A
= +25°C (Note 8)
250 400
WP = GND 15 20.6
Supply Current I
DD
Normal operation,
digital inputs at GND or
V
DD
, T
A
= +25°C
WP = V
DD
0.5 1
µA