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PDF AS1976 Data sheet ( Hoja de datos )
| Número de pieza | AS1976 | |
| Descripción | Ultra-Low Current 1.8V Comparators | |
| Fabricantes | austriamicrosystems AG | |
| Logotipo |  |
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AS1976, AS1977
Ultra-Low Current, 1.8V Comparators
Data Sheet
1 General Description
The AS1976/AS1977 are very low-current comparators
that can operate beyond the rail voltages and are guar-
anteed to operate down to 1.8V
Low input bias current, current-limiting output circuitry,
and ultra-small packaging make these comparators
ideal for low-power 2-cell applications including power-
management and power-monitoring systems.
The comparators are available as the standard products
listed in Table 1.
Table 1. Standard Products
Model
Output Type
Current
AS1976
Push/Pull
200nA
AS1977
Open-Drain
200nA
The AS1976 push/pull output can sink or source current.
The AS1977 open-drain output can be pulled beyond
VCC to a maximum of 6V > VEE. This open-drain model
is ideal for use as a logic-level translator or bipolar-to-
unipolar converter.
Large internal output drivers provide rail-to-rail output
swings with loads up to 8mA. Both devices feature built-
in battery power-management and power-monitoring cir-
cuitry.
The AS1976/AS1977 are available in a 5-pin SOT23
package.
2 Key Features
! CMOS Push/Pull Output Sinks and Sources 8mA
(AS1976)
! CMOS Open-Drain Output Voltage Extends Beyond
VCC (AS1977)
! Ultra-Low Supply Current: 200nA
! Internal Hysteresis: 3mV
! 3V-to5V Logiv-Level Translation
! Guaranteed to Operate Down to +1.8V
! Input Voltage Range Operates 200mV Beyond the
Rails
! Crowbar Current-Free Switching
! No Phase Reversal for Overdriven Inputs
! 5-pin SOT23 Package
3 Applications
The devices are ideal for battery monitoring/manage-
ment, mobile communication devices, laptops and
PDAs, ultra-low-power systems, threshold detectors/dis-
criminators, telemetry and remote systems, medical
instruments, or any other space-limited application with
low power-consumption requirements.
Figure 1. Block Diagram
5
VCC AS1976/
AS1977
3
+
IN+
4
–
IN-
1
OUT
2
VEE
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Revision 1.01
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1 page  
AS1976/AS1977
Data Sheet - Electrical Characteristics
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Table 4. AS1976/AS1977 Electrical Characteristics (Continued)
Symbol
Parameter
Conditions
Min Typ Max Units
AS1976 only, VCC = 1.8V
13
Low-to-High
AS1976 only, VCC = 5.5V
tPD+ Propagation Delay 4 AS1977 only, VCC = 1.8V, RPULUP = 100kΩ
15
16
µs
AS1977 only, VCC = 3.6V, RPULUP = 100kΩ
18
tRISE
Rise Time
AS1976 only, CLOAD = 15pF
10 ns
tFALL
Fall Time
CLOAD = 15pF
10 ns
tON Power-Up Time
100 ns
1. VOS is defined as the center of the hysteresis band at the input.
2. The hysteresis-related trip points are defined as the edges of the hysteresis band, measured with respect to the
center of the band (i.e., VOS) (see Figure 26 on page 11).
3. Guaranteed by design.
4. Specified with an input overdrive voltage (VOVERDRIVE) = 100mV, and load capacitance (CLOAD) = 15pF. VOVER-
DRIVE is defined above and beyond the offset voltage and hysteresis of the comparator input. A reference volt-
age error should also be added.
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Revision 1.01
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AS1976/AS1977
Data Sheet - Application Information
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9 Application Information
The AS1976/AS1977 comparators are perfect for use with all 2-cell battery-powered applications. Figure 25 shows a
typical application for the AS1977.
Figure 25. AS1977 Typical Application Circuit
VIN
5
4 VCC
IN-
AS1977
1
OUT
RPULLUP
32
IN+ VEE
Internal Hysteresis
The comparators were designed with 3mV of internal hysteresis to neutralize the effects of parasitic feedback, i.e., to
prevent unwanted rapid changes between the two output states.
The internal hysteresis in the AS1976/AS1977 creates two trip points:
! Rising Input Voltage (VTHR) – The comparator switches its output from low to high as VIN rises above this trip point.
! Falling Input Voltage (VTHF) – The comparator switches its output from high to low as VIN falls below this trip point.
The area between the trip points is the hysteresis band (VHB) (see Figure 26). When the AS1976/AS1977 input volt-
ages are equivalent, the hysteresis effectively causes one input to move quickly past the other, thus taking the input
out of the region where oscillation occurs. In Figure 26 IN- has a fixed voltage applied and IN+ is varied.
Note: If the inputs are reversed the output will be inverted.
Figure 26. Threshold Hysteresis Band
Thresholds
IN+
VTHR
IN-
VTHF
OUT
VHB
Hysteresis
Band
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11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AS1976.PDF ] | |
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