STM6905 STMicroelectronics, STM6905 Datasheet - Page 5

• Manufacturer Part Number: STM6905
• Description: Quintuple, ultralow voltage supervisor with push-button reset
• Manufacturer: STMicroelectronics

Specifications of STM6905

• Primary Supply (vcc) Monitor. Fixed (factory - Programmed) Reset Thresholds: 3.078 V to 2.866 V
• Second Fixed (v2in) Monitor. Fixed (factoryprogrammed) Reset Thresholds: 2.333 V to 1.050 V
• Reset Delay Time (trec) On Power-up: 210 ms (typ)
• Operating Temperature: –40°C to 85°C (industrial grade)

1
Description
The STM6905 supervisor is a low voltage/low supply current processor supervisor,
designed to monitor up to five system power supply voltages. This device is targeted at
applications such as set-top boxes (STBs), portable, battery-powered systems, networking
and communication systems.
The device supports a push-button type manual reset input (MR). Two of the five supply
monitors (V
(V
monitored using externally adjustable threshold (600 mV internal reference) to meet specific
level requirements.
If any of the five monitored voltages drops below its factory-trimmed or adjustable
thresholds, or if the MR is asserted to logic low, the reset output RST is asserted (driven
low). Once asserted, RST is maintained Low for a minimum delay period (trec) after ALL
monitored supplies rise above their respective thresholds and MR returns to High. Reset
output logic state is valid for V
The STM6905 is available in a standard 8-lead MSOP (TSSOP) package.
Figure 1.
Figure 2.
RST1
and V
CC
Logic diagram
MSOP/TSSOP-8 connections
RST2
and V2IN) have fixed (customer-selectable, factory-trimmed) thresholds
). The other three voltage monitor inputs (V3IN, V4IN and V5IN) are
V2IN
V3IN
V5IN
V4IN
MR
V2IN
CC
V
V
MR
CC
SS
greater than 0.8 V.
STM6905
1
2
3
4
V
V
SS
CC
8
7
6
5
RST
V5IN
V4IN
V3IN
RST
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