Features: ` PRIMARY SUPPLY (VCC1) MONITOR.
FIXED (FACTORY-PROGRAMMED) RESET
THRESHOLDS: 4.63V TO 1.58V
` SECONDARY SUPPLY (VCC2) MONITOR(STM6717/18/19/20/77/78).
FIXED (FACTORY-PROGRAMMED) RESET
THRESHOLDS: 3.08V TO 0.79V
` TERTIARY SUPPLY MONITOR (USING EXTERNALLY ADJUSTABLE RSTIN):
0.626V INTERNAL REFERENCE
` RST OUTPUTS (PUSH-PULL OR OPEN
DRAIN); STATE GUARANTEED IF VCC1 OR VCC2 0.8V
` RESET DELAY TIME (trec) ON POWER-UP:
210ms (typ)
` MANUAL RESET INPUT (MR)
` OPTIONAL DELAYED MANUAL RESET
INPUT (MRC) WITH EXTERNAL
CAPACITOR (STM6777/78/79/80)
` LOW SUPPLY CURRENT - 11A (TYP),
VCC1 = VCC2 = 3.6V
` OPERATING TEMPERATURE:
40°C to 85°C (Industrial Grade)Pinout
SpecificationsStressing the device above the rating listed in the Absolute Maximum Ratings" table may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant quality documents.
| Symbol |
Parameter |
Value |
Unit |
| TSTG |
Storage Temperature (VCC Off) |
55 to 150 |
°C |
| TSLD (1) |
Lead Solder Temperature for 10 seconds |
260 |
°C |
| VIO |
Input or Output Voltage |
0.3 to VCC1 + 0.3 |
V |
| 0.3 to VCC2 + 0.3 |
V |
| VCC1, VCC2 |
Supply Voltage |
0.3 to 7.0 |
V |
| IIO |
Input or Output Current (all pins) |
20 |
mA |
| PD |
Power Dissipation |
SOT23-5 |
654 |
mW |
| SOT23-6 |
675 |
mW |
Note: 1. Reflow at peak temperature of 255°C to 260°C for < 30 seconds (total thermal budget not to exceed 180°C for between 90 to 150 seconds).
DescriptionThe STM6717/18/19/20 and STM6777/78/79/80 Supervisors are a family of low voltage/low supply current processor (Micro or DSP) Supervisors, designed to monitor two (or three) system power supply voltages. They are targeted at applications such as Set-Top Boxes (STBs), portable, batterypowered systems, networking, and communication systems.
All device options have a push-button-type manual reset input (MR). The STM6777/78/79/80 also includes an option which enables the user to delay the start of the Manual Reset process from 6s (MRC pin left open) or more with external capacitor.
The delay is implemented by connecting the appropriately sized capacitor between the MRC pin and VSS (typical 4s delay with a 3.3F capacitor, see Table 7., page 19). Two of the three supplies monitored (VCC1 and VCC2) have fixed (customer-selectable, factorytrimmed) thresholds (VRST1 and VRST2).
The third voltage is monitored using an externally adjustable RSTIN threshold (0.626V internal reference). If any of the three monitored voltages drop below STM6777's factory-trimmed or adjustable thresholds, or if MR is asserted to logic low, a RST is asserted (driven low). Once asserted, RST is maintained at Low for a minimum delay period (trec) after ALL supplies rise above their respective thresholds and MR returns to High.
These devices STM6777 are guaranteed to be in the correct reset output logic state when VCC1 and/or VCC2 is greater than 0.8V. These devices are available in a standard 5-pin or 6-pin SOT23 packages (see Table 1., page 1).
STM6777 Data Sheet
