Datasheet
SLAS251A − DECEMBER 1999 − REVISED JANUARY 2003
22
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range, V
CC
= V
REFP
=
2.7 V to 5.5 V, V
REFM
= 0 V, SCLK frequency = 20 MHz at 5 V, 15 MHz at 3 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP
†
MAX UNIT
V
OH
High-level output voltage
V
CC
= 5.5 V, I
OH
= −0.2 mA at 25-pF load 2.4
V
V
OH
High-level output voltage
V
CC
= 2.7 V, I
OH
= -20 µA at 25-pF load
V
CC
−0.2
V
V
OL
Low-level output voltage
V
CC
= 5.5 V, I
OL
= 0.8 mA at 25-pF load 0.4
V
V
OL
Low-level output voltage
V
CC
= 2.7 V, I
OL
= 20 µA at 25-pF load
0.1
V
I
OZ
Off-state output current
(high-impedance-state)
V
O
= V
CC
CS = V
CC
1 2.5 µA
I
OZ
Off-state output current
(high-impedance-state)
V
O
= 0
CS = V
CC
−2.5 −1 µA
I
IH
High-level input current V
I
= V
CC
0.005 2.5 µA
I
IL
Low-level input current V
I
= 0 V −0.005 2.5 µA
CS at 0 V, Ext ref
V
CC
= 4.5 V to 5.5 V 1.1
mA
Operating supply current, normal
CS at 0 V, Ext ref
V
CC
= 2.7 V to 3.3 V 1
mA
Operating supply current, normal
short sampling
CS at 0 V, Int ref
V
CC
= 4.5 V to 5.5 V 2.1
mA
I
CC
short sampling
CS at 0 V, Int ref
V
CC
= 2.7 V to 3.3 V 1.6
mA
I
CC
CS at 0 V, Ext ref
V
CC
= 4.5 V to 5.5 V 1.1
mA
Operating supply current, extended
CS at 0 V, Ext ref
V
CC
= 2.7 V to 3.3 V 1
mA
Operating supply current, extended
sampling
CS at 0 V, Int ref
V
CC
= 4.5 V to 5.5 V 2.1
mA
sampling
CS at 0 V, Int ref
V
CC
= 2.7 V to 3.3 V 1.6
mA
I
CC(PD)
Power down supply current
for all digital inputs,
V
CC
= 4.5 V to 5.5 V, Ext clock 0.1 1
A
I
CC(PD)
for all digital inputs,
0 ≤ V
I
≤ 0.3 V or
V
I
≥ V
CC
− 0.3 V, SCLK = 0
V
CC
= 2.7 V to 3.3 V, Ext clock
0.1 1
µA
I
CC(AUTOPWDN)
Auto power-down current for all
digital inputs, 0 ≤ V
I
≤ 0.3 V or
V
CC
= 4.5 V to 5.5 V, Ext clock, Ext ref 1
‡
A
I
CC(AUTOPWDN
)
digital inputs, 0
≤
V
I
≤
0.3 V or
V
I
≥ V
CC
− 0.3 V, SCLK = 0
V
CC
= 2.7 V to 3.3 V, Ext ref, Ext clock
1.0
§
µA
Selected channel leakage current
Selected channel at V
CC
1
A
Selected channel leakage current
Selected channel at 0 V
1
µA
Maximum static analog reference
current into REFP (use external
reference)
V
REFP
= V
CC
= 5.5 V, V
REFM
= GND 1 µA
C
i
Input capacitance
Analog inputs 45 50
pF
C
i
Input capacitance
Control Inputs
5 25
pF
Z
i
Input MUX ON resistance
V
CC
= 4.5 V 500
Ω
Z
i
Input MUX ON resistance
V
CC
= 2.7 V 600
Ω
†
All typical values are at V
CC
= 5 V, T
A
= 25°C.
‡
1.2 mA if internal reference is used, 165 µA if internal clock is used.
§
0.8 mA if internal reference is used, 116 µA if internal clock is used.