Rainbow Electronics MAX977 - Manual (Page 10)

MAX975/MAX977
Single/Dual, +3V/+5V Dual-Speed
Comparators with Auto-Standby
10 ______________________________________________________________________________________
_____________________________________________________________Pin Descriptions
Set Timeout Input. Connect a capacitor from STO to GND to program the time the comparator may
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
µ
s, where C is in pF.
STO 5
Ground GND 6
Comparator Output OUT 7
LP 8
Mode Status Pin. Indicates the operating mode. STAT is high for auto-standby mode or low-power
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.
STAT 4
Inverting Comparator Input IN- 3
PIN
Noninverting Comparator Input IN+ 2
Positive Supply Voltage, +2.7V to +5.25V V CC 1
FUNCTION NAME
Low Power Mode Input. Drive LP high for low-power mode. 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 V
CC if high-speed mode will not be used.
FUNCTION QSOP
1, 9
2, 10
3, 11
4, 5
8, 16
7, 15
6, 14
13
12
NAME
1, 8
STOA,
STOB
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: t
ASB = 10 x C
µ
s, where C is in pF.
2, 9 GNDA, GNDB Ground for Comparator A/B
3, 10 OUTA, OUTB Output for Comparator A/B
4 V CC Positive Supply Voltage, +2.7V to +5.25V. For QSOP, connect pin 4 to pin 5.
7, 14
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.
6, 13 INB-, INA- Inverting Input for Comparator B/A
5, 12 INB+, INA+ Noninverting Input for Comparator B/A
11 LP
Low Power Mode Input for both comparators. Drive LP high for low-power mode.
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 V
CC
if
high-speed mode will not be used.
— N.C. No connection. Not internally connected.
SO
MAX975
MAX977