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TL7702-TL7702ACD1/A-TL7705-TL7705ACD1013TRA
SUPPLY VOLTAGE SUPERVISORS
TL7700A SeriesJuly 2000
SUPPLY VOLTAGE SUPERVISORS POWER-ON RESET GENERATOR. AUTOMATIC RESET GENERATION AFTER
VOLTAGE DROP. WIDE SUPPLY VOLTAGE RANGE ... 3V TO
18V. PRECISION VOLTAGE SENSOR. TEMPERATURE-COMPENSATED VOLTAGE
REFERENCE. TRUE AND COMPLEMENT RESET OUTPUTS. EXTERNALLY ADJUSTABLE PULSE WIDTH
DESCRIPTIONThe TL7700A series are monolithic supply voltage
supervisor IC’s specifically designed for use as reset
controllers in microcomputer and microprocessor
systems. During power-up the device tests the sup-
ply voltage and keeps the RESET and RESET out-
puts active (high and low, respectively) as long as
the supply voltage has not reached its nominal volt-
age value. Taking RESIN low has the same effect.
To ensure that the microcomputer system has reset,
the TL7700A then initiates an internal time count
that delays the return of the reset outputs to their in-
active states. Since the time delay for most micro-
computers and microprocessors is in the order of
several machine cycles, the device internal time de-
lay is determined by an external capacitor con-
nected to the CT input (pin 3).
tpo = 1.3 x 104 x CT
Where : CT is in farads (F) and tpo in seconds (s). In
addition, when the supply voltage drops below the
nominal value, the outputs will be active until the
supply voltage returns to the nominal value. An ex-
ternal capacitor (typically 0.1 μF) must be connected
to the REF output (pin 1) to reduce the influence of
fast transients in the supply voltage.
The TL7700AI series is characterized for operation
from – 25o C to 85o C ; the TL7700AC series is char-
acterized from 0o C to 70oC.
ORDERING NUMBERS
PIN CONNECTION (top view)1/7
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Notes : 1. All voltage values are with respect to the network ground terminal For the TL7700A, the voltage applied to the SENSE terminal must never exceed Vs.
THERMAL DATA
RECOMMENDED OPERATING CONDITIONS
Note :3. For proper operation of the TL7702A, the voltage applied to the SENSE terminal should not exceed Vs - 1V or 6V, which ever is less.
TL7700A Series2/7
ELECTRICAL CHARACTERISTICS these specifications unless otherwise specified, apply for :Tamb = –25 to 85o C (TLXXAI), Tamb = 0 to 70o C (TL77XXAC)
Notes :1. All characteristics are measured with C = 0.1μF from Pin 1 to GND, and with C = 0.1μF from Pin 3 to GND. Hysteresis is the difference between the positive going input threshold voltage. VT+, and the negative going input threshold
voltage, VT-.
SWITCHING CHARACTERISTICS
TL7700A Series3/7
Figure 1 : Reset Controller for μP
TL7700A Series4/7
(1) D and F do not include mold flash or protrusions. Mold flash or
potrusions shall not exceed 0.15mm (.006inch).
TL7700A Series5/7
TL7700A Series6/7
