STM6904PWEDS6E STMICROELECTRONICS [STMicroelectronics], STM6904PWEDS6E Datasheet - Page 5

• Manufacturer Part Number: STM6904PWEDS6E
• Description: Quad, ultralow voltage supervisor with push-button reset
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

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 (0.600V 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
V3IN
V4IN
V2IN
V
V
MR
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 0.8V.
ai13976
SEL
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rec
) after ALL
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