STM6904 STMicroelectronics, STM6904 Datasheet - Page 5

• Manufacturer Part Number: STM6904
• Description: Quad, ultralow voltage supervisor with push-button reset
• Manufacturer: STMicroelectronics

Specifications of STM6904

• Primary Supply (vcc) Monitor. Fixed (factory -programmed) Reset Thresholds: 3.078 to 2.188 V
• Second Fixed (v2in) Monitor. Fixed (factory-programmed) Reset Thresholds: 2.333 to 1.110 V
• Operating Temperature: –40 to 85 °C (industrial grade)

STM6904
1
Description
The STM6904 supervisor is a low voltage/low supply current processor supervisor,
designed to monitor up to four 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 four supply
monitors (V
(V
using externally adjustable threshold (0.600 V internal reference) to meet specific level
requirements.
If any of the four 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 (t
monitored supplies rise above their respective thresholds and MR returns to high. This
device is in the correct reset output logic state when V
The STM6904 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 two voltage monitor inputs (V3IN and V4IN) are monitored
TR
V2IN
V4IN
V3IN
V2IN
Doc ID 14289 Rev 3
V
MR
V
MR
SEL
CC
SS
STM6904
1
2
3
4
V
V
SS
CC
8
7
6
5
CC
RST
RST
TR
V4IN
V3IN
greater than 0.8 V.
ai13976
SEL
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REC
) after ALL
Description
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