LTC690CN8 Linear Technology, LTC690CN8 Datasheet - Page 6

• Manufacturer Part Number: LTC690CN8
• Description: IC MPU SUPERVISORY CIRCUIT 8-DIP
• Manufacturer: Linear Technology
• Type: Simple Reset/Power-On Resetr

Specifications of LTC690CN8

• Number Of Voltages Monitored: 1
• Output: Open Drain or Open Collector
• Reset: Active Low
• Reset Timeout: 35 ms Minimum
• Voltage - Threshold: 4.65V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

LTC690/LTC691
LTC694/LTC695
BLOCK DIAGRAM
PIN FUNCTIONS
V
with a 0.1μF capacitor.
V
a capacitor of 0.1μF or greater. During normal operation,
V
switch, M1, which can deliver up to 50mA and has a typical
on resistance of 5Ω. When V
is internally switched to V
used, connect V
V
auxiliary power, connected to V
through PMOS switch, M2. If back-up battery or auxiliary
power is not used, V
6
CC
OUT
OUT
BATT
: 5V Supply Input. The V
: Voltage Output for Backed Up Memory. Bypass with
: Back-Up Battery Input. When V
obtains power from V
OUT
OSC SEL
OSC IN
V BATT
to V
BATT
CE IN
V CC
WDI
PFI
CC
should be connected to GND.
BATT
.
CC
CC
CC
. If V
through an NMOS power
BATT
is lower than V
pin should be bypassed
OUT
TRANSITION
, is delivered to V
DETECTOR
1.3V
GND
OSC
CC
and V
falls below V
+
–
–
+
–
+
C1
C2
C3
BATT
BATT
are not
, V
M2
BATT
OUT
OUT
RESET PULSE
GENERATOR
WATCHDOG
,
TIMER
GND: Ground pin.
BATT ON: Battery On Logic Output from Comparator C2.
BATT ON goes low when V
V
base drive for an external PNP transistor to increase the
output current above the 50mA rating of V
goes high when V
PFI: Power Failure Input. PFI is the noninverting input
to the power-fail comparator, C3. The inverting input is
internally connected to a 1.3V reference. The power failure
output remains high when PFI is above 1.3V and goes
low when PFI is below 1.3V. Connect PFI to GND or V
when C3 is not used.
CHARGE
PUMP
CC
M1
. The output typically sinks 35mA and can provide
OUT
is internally switched to V
OUT
BATT ON
CE OUT
LOW⎯LINE
PFO
RESET
RESET
WDO
690 BD
V OUT
is internally connected to
OUT
. BATT ON
BATT
.
OUT
690fe