MAX977 データシートの表示（PDF） - Maxim Integrated
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MAX977 Datasheet PDF : 16 Pages
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Single/Dual, +3V/+5V Dual-Speed
Comparators with Auto-Standby
_____________________________________________________________Pin Descriptions
MAX975
PIN
NAME
FUNCTION
1
VCC
Positive Supply Voltage, +2.7V to +5.25V
2
IN+
Noninverting Comparator Input
3
IN-
Inverting Comparator Input
Mode Status Pin. Indicates the operating mode. STAT is high for auto-standby mode or low-power
4
STAT
mode, and during the transition to high-speed mode. STAT = low indicates that the comparator is in
high-speed mode. STAT can source 3mA to power additional circuitry.
Set Timeout Input. Connect a capacitor from STO to GND to program the time the comparator may
5
STO
remain idle before entering standby mode. Connect STO to GND to disable the auto-standby fea-
ture. Calculate timeout with the following relationship: tASB = 10 x C µs, where C is in pF.
6
GND
Ground
7
OUT
Comparator Output
Low Power Mode Input. Drive LP high for low-power mode. Drive LP low for high-speed mode
8
LP
(STO = GND) or for high-speed mode with auto-standby. Connect to GND if low-power mode will
not be used. Connect to VCC if high-speed mode will not be used.
MAX977
SO
1, 8
2, 9
3, 10
4
5, 12
6, 13
7, 14
—
11
QSOP
1, 9
2, 10
3, 11
4, 5
6, 14
7, 15
8, 16
12
13
NAME
FUNCTION
STOA,
STOB
GNDA, GNDB
OUTA, OUTB
VCC
INB+, INA+
INB-, INA-
Set Idle Timeout Input A/B. Connect a capacitor from STOA/STOB to GND to program
the time in which comparator A/B may remain idle before entering standby mode.
Connect STOA/STOB to GND to disable the auto-standby feature for comparator A/B.
Calculate timeout with the following relationship: tASB = 10 x C µs, where C is in pF.
Ground for Comparator A/B
Output for Comparator A/B
Positive Supply Voltage, +2.7V to +5.25V. For QSOP, connect pin 4 to pin 5.
Noninverting Input for Comparator B/A
Inverting Input for Comparator B/A
STATB,
STATA
Mode Status Pin B/A. Indicates the operating mode of comparator B/A.
STATB/STATA is high for auto-standby mode or for low-power mode, and during
the transition to high-speed mode. STATB/STATA = low indicates that comparator
B/A is in high-speed mode. STATB/STATA can source 3mA to power additional
circuitry.
N.C.
No connection. Not internally connected.
Low Power Mode Input for both comparators. Drive LP high for low-power mode.
LP
Drive LP low for high-speed mode (STO_ = GND) or for high-speed mode with auto-
standby. Connect to GND if low-power mode will not be used. Connect to VCC if
high-speed mode will not be used.
10 ______________________________________________________________________________________
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