TC1040CEUATR Microchip Technology, TC1040CEUATR Datasheet - Page 4

• Manufacturer Part Number: TC1040CEUATR
• Description: IC DUAL COMPARATOR W/VREF 8MSOP
• Manufacturer: Microchip Technology
• Type: with Voltage Referencer

Specifications of TC1040CEUATR

• Output Type: Rail-to-Rail
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Number Of Elements: 2
• Voltage - Supply: 1.8 V ~ 5.5 V
• Mounting Type: Surface Mount
• Number Of Channels: 2 Channels
• Product: Analog Comparators
• Response Time: 6 us
• Offset Voltage (max): 5 mV
• Input Bias Current (max): 0.0001 uA
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1.8 V
• Supply Current (max): 0.01 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Request inventory verification / Request inventory verification

TC1040
3.0
The TC1040 is one of a series of very low power, linear
building block products targeted at low voltage, single
supply applications. The TC1040 minimum operating
voltage is 1.8V and typical supply current is only 10μA
(fully enabled). It combines two comparators and a
voltage reference in a single package. A shutdown
mode is incorporated for easy adaptation to system
power management schemes. During shutdown, one
comparator is disabled (i.e., powered down with output
at a high impedance). The “still awake” comparator and
voltage reference can be used as a wake-up timer,
power supply monitor, LDO controller or other
continuous duty circuit function.
3.1
The TC1040 contains two comparators. The compara-
tor’s input range extends beyond both supply voltages
by 200mV and the outputs will swing to within several
millivolts of the supplies, depending on the load current
being driven. The inverting input of Comparator A and
the non-inverting input of Comparator B are internally
connected to the output of the voltage reference.
The comparators exhibit a propagation delay and
supply current which are largely independent of supply
voltage. The low input bias current and offset voltage
make them suitable for high impedance precision
applications.
Comparator B is disabled during shutdown and has a
high impedance output. Comparator COMPA remains
active.
3.2
A 2.0 percent tolerance, internally biased, 1.20V
bandgap voltage reference is included in the TC1040.
It has a push-pull output capable of sourcing and
sinking 50μA. The voltage reference remains fully
enabled during shutdown.
3.3
SHDN at V
cannot be allowed to float; when not used, connect it to
V
impedance state when shutdown is active. The
disabled comparator’s inputs and outputs can be driven
from rail-to-rail by an external voltage when the
TC1040 is in shutdown. No latchup will occur when the
device is driven to its enabled state when SHDN is set
to V
DS21345C-page 4
DD
IH
. The disabled comparator’s output is in a high
.
DETAILED DESCRIPTION
Comparators
Voltage Reference
Shutdown Input
IL
disables one comparator. The SHDN input
4.0
The TC1040 lends itself to a wide variety of
applications, particularly in battery powered systems. It
typically finds application in power management,
processor supervisory and interface circuitry.
4.1
Many microcontrollers have a low-power “sleep” mode
that significantly reduces their supply current. Typically,
the microcontroller is placed in this mode via a software
instruction, and returns to a fully-enabled state upon
reception of an external signal (“wake-up”). The wake-
up signal is usually supplied by a hardware timer. Most
system applications demand that this timer have a long
duration (typically seconds or minutes), and consume
as little supply current as possible.
The circuit shown in Figure 4-1 is a wake-up timer
made from Comparator A. (Comparator A is used
because the wake-up timer must operate when SHDN
is active.) Capacitor C1 charges through R1 until a
voltage equal to V
“wake-up” is driven active. Upon wake-up, the
microcontroller resets the timer by forcing a logic low
on a dedicated, open drain I/O port pin. This discharges
C1 through R4 (the value of R4 is chosen to limit
maximum current sunk by the I/O port pin). With a 3V
supply, the circuit as shown consumes typically 8μA
and furnishes a nominal timer duration of 25 seconds.
FIGURE 4-1:
10µF
*Open Drain Port Pin
C
1
TYPICAL APPLICATIONS
Wake-Up Timer
5M
R1
V
R
1/2
R4
V
R
DD
+
is reached, at which point the
V
–
WAKE-UP TIMER
DD
© 2005 Microchip Technology Inc.
TC1040
COMPA
I/O*
Wake-Up
Microcontroller