SGM811

SGM811 SGM812

Microprocessor Supervisory

with Manual Reset Input

ORDERING INFORMATION

ORDERING NUMBER

RESET

THRESHOLD

(V)

PECKAGE

TYPE

SPECIFIED

TEMPERATURE

RANGE

PACKAGE

MARKING

PACKAGE

OPTION

SGM811-LXN5 4.63 SOT23-5 - 40°C to +125°C 811L Tape and Reel, 3000 SGM811-M XN5 4.38 SOT23-5 - 40°C to +125°C 811M Tape and Reel, 3000 SGM811-JXN5 4.00 SOT23-5 - 40°C to +125°C 811J Tape and Reel, 3000 SGM811-T XN5 3.08 SOT23-5 - 40°C to +125°C 811T Tape and Reel, 3000 SGM811-S XN5 2.93 SOT23-5 - 40°C to +125°C 811S Tape and Reel, 3000 SGM811-R XN5 2.63 SOT23-5 - 40°C to +125°C 811R Tape and Reel, 3000 SGM811-Z XN5 2.32 SOT23-5 - 40°C to +125°C 811Z Tape and Reel, 3000 SGM811-LXKA4 4.63 SOT143-4 - 40°C to +125°C 811L Tape and Reel, 3000 SGM811-MX KA4 4.38 SOT143-4 - 40°C to +125°C 811M Tape and Reel, 3000 SGM811-JX KA4 4.00 SOT143-4 - 40°C to +125°C 811J Tape and Reel, 3000 SGM811-TX KA4 3.08 SOT143-4 - 40°C to +125°C 811T Tape and Reel, 3000 SGM811-SX KA4 2.93 SOT143-4 - 40°C to +125°C 811S Tape and Reel, 3000 SGM811-RX KA4 2.63 SOT143-4 - 40°C to +125°C 811R Tape and Reel, 3000 SGM811-Z X KA4 2.32 SOT143-4 - 40°C to +125°C 811Z Tape and Reel, 3000 SGM812-LXN5 4.63 SOT23-5 - 40°C to +125°C 812L Tape and Reel, 3000 SGM812-M XN5 4.38 SOT23-5 - 40°C to +125°C 812M Tape and Reel, 3000 SGM812-JXN5 4.00 SOT23-5 - 40°C to +125°C 812J Tape and Reel, 3000 SGM812-T XN5 3.08 SOT23-5 - 40°C to +125°C 812T Tape and Reel, 3000 SGM812-S XN5 2.93 SOT23-5 - 40°C to +125°C 812S Tape and Reel, 3000 SGM812-R XN5 2.63 SOT23-5 - 40°C to +125°C 812R Tape and Reel, 3000 SGM812-Z XN5 2.32 SOT23-5 - 40°C to +125°C 812Z Tape and Reel, 3000 SGM812-LX KA4 4.63 SOT143-4 - 40°C to +125°C 812L Tape and Reel, 3000 SGM812-MX KA4 4.38 SOT143-4 - 40°C to +125°C 812M Tape and Reel, 3000 SGM812-JX KA4 4.00 SOT143-4 - 40°C to +125°C 812J Tape and Reel, 3000 SGM812-TX KA4 3.08 SOT143-4 - 40°C to +125°C 812T Tape and Reel, 3000 SGM812-SX KA4 2.93 SOT143-4 - 40°C to +125°C 812S Tape and Reel, 3000 SGM812-RX KA4 2.63 SOT143-4 - 40°C to +125°C 812R Tape and Reel, 3000 SGM812-Z X KA4 2.32 SOT143-4 - 40°C to +125°C 812Z Tape and Reel, 3000

SGM811/812

2

ELECTRICAL CHARACTERISTICS

(V CC Typ = 5 V for L/M/J Models, 3.3 V for T/S Models, 3 V for R Models, 2.5 V for Z Models; unless otherwise noted.)

SGM811/812

3

SGM811/812

4

ELECTRICAL CHARACTERISTICS (continued)

(V CC Typ = 5 V for L/M/J Models, 3.3 V for T/S Models, 3 V for R Models, 2.5 V for Z Models; unless otherwise noted.)

Specifications subject to change without notice.

ABSOLUTE MAXIMUM RATINGS

(Typical values are at T A = 25°C, unless otherwise noted.) Terminal Voltage (With Respect to Ground)

V CC ................................................................................–0.3 V to +6 V All Other Inputs ............................................ –0.3 V to V CC + 0.3 V Input Current

V

CC , ................................................................................ 20 mA Output Current

RESET , RESET ..................................................................... 20 mA Power Dissipation, P D @ T A = 25℃

SOT23-5 .....................................................................................0.4W SOT143-4.................................................................................. 0.32W Operating Temperature Range...........................- 40°C to +125°C Junction Temperature...........................................................+150°C Storage Temperature.............................................- 65°C to +150°C Lead Temperature (soldering, 10s).....................................+260°C ESD Susceptibility

HBM..........................................................................................4000V MM..............................................................................................400V

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

PIN DESCRIPTION

TYPICAL PERFORMANCE CHARACTERISTICS

TYPICAL PERFORMANCE CHARACTERISTICS

APPLICATION NOTES

MANUAL RESET

The SGM811/SGM812 is equipped with a manual reset input This input is designed to operate in a noisy environment where unwanted glitches could be induced. These glitches could be produced by the bouncing action of a switch contact,

or where a manual reset switch may be located some distance away from the circuit (the cabling of which may pick-up noise).

The manual reset input is guaranteed to ignore logically valid inputs that are faster than 100 ns and to accept inputs longer in duration than 10 μs.

BENEFITS OF A VERY ACCURATE RESET THRESHOLD Because the SGM811/SGM812 can operate effectively even when there are large degradations of the supply voltages, the possibility of a malfunction during a power failure is greatly reduced. Another advantage of the SGM811/SGM812 is its very accurate internal voltage reference circuit. Combined, these benefits produce an exceptionally reliable microprocessor supervisory circuit.

Figure 1. Ensuring a Valid Output Down to V CC = 0V

ENSURING A VALID RESET OUTPUT DOWN TO V CC = 0 V When V CC falls below1.0 V, the SGM811/SGM812’s RESET no longer sinks current. Therefore, a high impedance CMOS logic input connected to RESET may drift to undetermined logic levels. To eliminate this problem, a 100 kΩ resistor should be connected from RESET to ground. RESET OUTPUT

On power-up and after V CC rises above the reset threshold, an internal timer holds the reset output active for 240 ms (typical). This is intended as a power-on reset signal for the processor. It allows time for both the power supply and the microprocessor to stabilize after power-up. If a power supply brownout or interruption occurs, the reset output is similarly activated and remains active for 240 ms (typical) after the supply recovers. This allows time for the power supply and microprocessor to stabilize.

The SGM811 provides an active low reset output (RESET) while the SGM812 provides an active high output (). During power-down of the SGM811, the RESET output remains valid (low) with V CC as low as 1 V. This ensures that the microprocessor is held in a stable shutdown condition as the supply falls and also ensures that no spurious activity can occur via the microprocessor as it powers up.

Glitch Immunity

The SGM811/SGM812 contains internal filtering circuitry providing glitch immunity from fast transient glitches on the power supply line.

RESET

V CC

1RESET

V REF =RESET Voltage Threshold

Figure 2. Power Fail RESET Timing

INTERFACING TO OTHER DEVICES

Output

The SGM811/SGM812 is designed to integrate with as many devices as possible. One feature of the SGM811/SGM812 is the reset output, which is directly proportional to V CC (this is guaranteed only while V CC is greater than 1 V). This enables the part to be used with both 3 V and 5 V, or any nominal voltage within the minimum and maximum specifications for V CC.

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PACKAGE OUTLINE DIMENSIONS SOT23-5

PACKAGE OUTLINE DIMENSIONS SOT143- 4