Datasheet

MAX6765–MAX6774
Automotive Micropower Linear Regulators
with Supervisor
18
Maxim Integrated
Ensuring a Valid RESET Output Down to
V
IN
= 0V (MAX6766/MAX6768/MAX6770/
MAX6772/MAX6774/MAX6774B)
When V
IN
falls below 1V, RESET current-sinking capa-
bilities decline drastically. High-impedance CMOS-
logic inputs connected to RESET can drift to
undetermined voltages. This presents no problems in
most applications, since most µPs and other circuitry
do not operate with supply voltages below 1V. In appli-
cations where RESET must be valid down to 0V, adding
a pulldown resistor between RESET and ground sinks
any stray leakage currents, holding RESET low (Figure
5). The value of the pulldown resistor is not critical;
100kΩ is large enough not to load RESET and small
enough to pull RESET to ground. Open-drain RESET
versions are not recommended for applications requir-
ing valid logic for V
IN
down to 0V.
PART
OUTPUT
VOLTAGE (V)
RESET
TIMEOUT
PERIOD (ms)
RESET
THRESHOLD
(V)
RESETIN
THRESHOLD
(V)
TOP MARK
MAX6765TTLD2+T 5 12.5
4.625
— +AQB
MAX6765TTSD2+T 3.3 12.5
2.888
— +AQL
MAX6766TTLD2+T 5 12.5
4.625
— +ARO
MAX6766TTSD2+T 3.3 12.5
2.888
— +ARZ
MAX6767TALD2+T 5 12.5
4.625
— +AVI
MAX6767TASD2+T 3.3 12.5
2.888
— +AVS
MAX6768TALD2+T 5 12.5
4.625
— +AVZ
MAX6768TASD2+T 3.3 12.5
2.888
— +AXE
MAX6769TALD2+T 5 12.5
—
1.147 +AYH
MAX6769TASD2+T 3.3 12.5
—
1.085 +AYQ
MAX6770TALD2+T 5 12.5
—
1.147 +AZS
MAX6770TASD2+T 3.3 12.5
—
1.085 +BAC
MAX6771TALD2+T 5 12.5
4.625
— +BEG
MAX6771TASD2+T 3.3 12.5
2.888
— +BEQ
MAX6772TALD2+T 5 12.5
4.625
— +APY
MAX6772TASD2+T 3.3 12.5
2.888
— +BGC
MAX6773TALD2+T 5 12.5
4.625
— +BBG
MAX6773TASD2+T 3.3 12.5
2.888
— +AQE
MAX6773BTALD2+T 5 12.5
4.625
— +BHK
MAX6773BTASD2+T 3.3 12.5
2.888
— +BHU
MAX6774TALD2+T 5 12.5
4.625
— +BCS
MAX6774TASD2+T 3.3 12.5
2.888
— +BDC
MAX6774BTALD2+T 5 12.5
4.625
— +BIY
MAX6774BTASD2+T 3.3 12.5
2.888
— +BJI
Table 4. Standard Version Part Numbers
MAX6766
MAX6768
MAX6770
MAX6772
MAX6774
MAX6774B
RESET
GND
IN
V
IN
Figure 5. Ensuring RESET Valid to V
IN
= 0V