S e ria lly In t e rfa c e d , 8 -Dig it LED Dis p la y Drive rs
9/MAX721
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 5V ±10%, R
=9.53kΩ ±1%, T = T
to T , unless otherwise noted.)
MAX
SET
A
MIN
PARAMETER
LOGIC INPUTS
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Input Current DIN, CLK,
LOAD, CS
I
, I
V
IN
= 0V or V+
-1
1
µA
IH IL
Logic High Input Voltage
Logic Low Input Voltage
Output High Voltage
Output Low Voltage
V
3.5
V
V
V
V
V
IH
V
IL
0.8
0.4
V
OH
DOUT, I
= -1mA
SOURCE
V+ - 1
V
OL
DOUT, I = 1.6mA
SINK
Hysteresis Voltage
∆V
1
DIN, CLK, LOAD, CS
I
TIMING CHARACTERISTICS
CLK Clock Period
t
100
50
ns
ns
ns
CP
CLK Pulse Width High
CLK Pulse Width Low
t
CH
t
50
CL
CS Fall to SCLK Rise Setup Time
(MAX7221 only)
t
25
0
ns
ns
CSS
CLK Rise to CS or LOAD Rise
Hold Time
t
CSH
DIN Setup Time
t
25
0
ns
ns
ns
DS
DH
DO
DIN Hold Time
t
Output Data Propagation Delay
t
C
= 50pF
25
LOAD
Load-Rising Edge to Next Clock
Rising Edge (MAX7219 only)
t
t
50
50
ns
LDCK
Minimum CS or LOAD Pulse
High
t
ns
CSW
Data-to-Segment Delay
2.25
ms
DSPD
_______________________________________________________________________________________
3
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
