TinyLogic
®
LOW ICCT GATES FOR CMOS TECHNOLOGY
Fairchild’s Offering
Fairchild’s new series of logic gates, NC7SVL, reduces power consumption in mobile applications that require
mixed voltage levels. Since undetected ICC supply current may increase in these types of designs, there is a risk of
increased power consumption as a result. Fairchild’s NC7SVL logic gates eliminate hidden power consumption in
mixed supply designs, enabling designers to stay within their power budgets and ensuring longer battery life.
Low ICCT Saves Power
In most ultra-portable applications today, there are multiple supply rails available and hidden power consumption can
occur when input levels (VIH) are lower than VCC when using logic gates. Under these conditions, the quiescent ICC
current will increase as there is a path from VCC to GND. This current is known as ICCT, as shown in Figure 1.
VCC
3.6V
VIH
VIH
3.6V
2.5V
3.6V
3.6V
GND
VCC
3.6V
ICCT
GND
Ideal usage of CMOS gate with equal input
voltages and supply voltage of VCC;
as a result, ICC current will be extremely low.
In a mixed voltage situation, where VIN < VCC
ICCT current is present and increased power
consumption will occur.
Figure 1
Fairchild Semiconductor’s low ICCT gates are designed to change the input structure such that the threshold region is
shifted to allow for a wider input voltage range without incurring an increase in ICCT current. Figure 2 below shows the
effect of a redesigned input structure–the VIN versus ICC plot compares a standard CMOS input device with a low ICCT
input design.
ICC vs. VIN Curve at VCC = 3.6V
5.0
ICC = (mA)
4.0
Standard CMOS Input
3.6V x 0.9mA = 3.2mW
3.0
2.0
Low ICCT Input
3.6V x 0.1A = 0.0003mW
1.0
0.0
0.00
0.75
1.50
2.25
VIN = (V)
X
3.00
3.75
4.5
VIN = 2.5V
Figure 2
Saving our world, 1mW at a time™
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Fairchild’s NC7SVL low ICCT gates are now available. Custom designs may also be requested. Note that pin outs are
standard; therefore, offer the user a direct drop-in replacement option for existing applications that would benefit from
decreased power consumption.
30% Smaller
Product
Number
VCC
(Min.)
VCC
(Max.)
Output
Characteristics
Number of Inputs
Package
Additional Features
NC7SVL04
-0.5
4.6
-0.5 to 4.5
1
MicroPAK2,
MicroPak & SC70
Low ICCT for low
power consumption
NC7SVL08
-0.5
4.6
-0.5 to 4.6
2
MicroPAK2,
MicroPak & SC70
Low ICCT for low
power consumption
NC7SVL32
-0.5
4.6
-0.5 to 4.6
2
MicroPAK2,
MicroPak & SC70
Low ICCT for low
power consumption
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Lit. No. 100017-001 © 2009 Fairchild Semiconductor. All Rights Reserved.
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