TSM917
PIN FUNCTIONS
TSM917
5-pin
8-pin
SOT23
SOIC
1
6
2
4
3
3
4
5
—
—
2
7
—
1, 5, 8
NAME
OUT
VEE
IN+
REF
VCC
IN-
NC
FUNCTION
Comparator Output
Negative Supply Voltage
Comparator Noninverting Input
1.245V Reference Output and
Comparator Inverting Input
Positive Supply Voltage
Comparator Inverting Input
No Connection. Not internally connected.
BLOCK DIAGRAMS
DESCRIPTION OF OPERATION
Guaranteed to operate from +1.8V supplies, the
TSM917 analog comparator only draws 750nA
supply current, features a robust input stage that can
tolerate input voltages 200mV beyond the power
supply rails, and includes an on-board +1.245V
±1.5% voltage reference. To insure clean output
switching behavior, the TSM917 features 4mV
internal hysteresis. The TSM917’s push-pull output
drivers were designed to minimize supply-current
surges while driving ±8mA loads with rail-to-rail
output swings.
Input Stage Circuitry
The robust design of the analog comparator’s input
stage can accommodate any differential input
voltage from V
EE
- 0.2V to V
CC
+ 0.2V. Input bias
currents are typically ±0.15nA so long as the applied
input voltage remains between the supply rails. ESD
protection diodes - connected internally to the supply
rails - protect comparator inputs against overvoltage
conditions. However, if the applied input voltage
exceeds either or both supply rails, an increase in
input current can occur when these ESD protection
diodes start to conduct.
TSM917DS r1p0
Page 9
RTFDS
TOUCHSTONE [ TOUCHSTONE SEMICONDUCTOR INC ]
