ISL55143_15 Datasheet, PDF (5/14 Pages) Intersil Corporation – High-Speed 18V CMOS Comparators

ISL55141, ISL55142, ISL55143
Electrical Specifications Test Conditions: V_CC = 12V, V_EE = -3V, V_OH = 5V, V_OL = 0V, PD = V_EE, C_LOAD = 15pF_, T_A = 25°C, unless
otherwise specified. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
(Note 13)
TYP
MAX
(Note 13)
UNITS
Input Capacitance (Note 11)
DIGITAL OUTPUTS Q_AX, Q_BX
Output Resistance
C_IN
RoutR
2.5
pF
18
27
37

Output Logic High Voltage
V_OH
Output Logic Low Voltage
V_OL
POWER SUPPLIES, STATIC CONDITIONS
V_OH = 5V, I_SOURCE = 1mA
V_OL = 0V, I_SINK = 1mA
4.9
4.95
5.0
V
0.00
0.05
0.1
V
Positive Supply DC Current/Comparator
I_CC
No input data
Negative Supply Current/Comparator
I_EE
No input data
Total Power Dissipation/Comparator P (Note 12) Input data at 40MHz
+8.25
12.5
mA
-12.5
-8.25
mA
670
mW
NOTES:
9. Lab characterization, room temperature, timing parameters matched stimulus/loads, channel-to-channel skew < 500ps, 1ns maximum by design
10. Note about I_CC measurement input can approach 140mA (single comparator) at maximum pattern rates
11. Limits should be considered typical and are not production tested.
12. Total Power dissipation per comparator can be approximately calculated from the following:
P = (V_CC-V_EE)*8.25mW + 90pF*(V_CC-V_EE)^2*f + C_L*(V_CC-V_EE)^2*f, where f is the operating frequency and C_L is the load capacitance.
Because the ISL55142 has two comparators, the power dissipation would be twice of P calculated from this equation. The ISL55143 would be
four times P.
13. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.
Test Circuits and Waveforms
DATA = 1
DATA = 0
400mV
V_INPX
0V
t_PDLH
t_PDHL
Q_AX, Q_BX
50%
t_R
50%
t_F
V_OH (V_H)
V_OL (V_L)
FIGURE 2. COMPARATOR PROPAGATION DELAY AND TRANSITION TIME MEASUREMENT POINTS
CV_A 2.4V
V_INP
CV_B 0.4V
+
-
V_CC
Although there is no electrical difference between the CV_A
and CV_B Inputs, if one defines CV_A as being the high
threshold and CV_B being the low threshold, it becomes
easier to understand the utilization of a dual threshold
comparator. Essentially this enables the qualification of an
Q_A
incoming signal into three states. In Figure 3, the three
states are Valid Low <0.4V, No-man’s-land (between 0.4
and 2.4V), Valid High >2.4V. Table 2 shows how the Q_A/Q_B
truth table would be utilized in the real world.
+
V_EE
-
Q_B
TABLE 2. Q_A/Q_B TRUTH TABLE
V_INP
Q_A
Q_B
COMMENT
<0.4V
0
0
Valid 0
>0.4 and <2.4V
0
1
Invalid
>2.4V
1
1
Valid 1
FIGURE 3. THREE-STATE WINDOW COMPARATOR FUNDAMENTALS
5
FN6230.4
August 13, 2015