Document
Features
■ Precision monitoring of 3 V, 3.3 V, and 5 V supply voltages
■ Two output configurations – Push-pull RST output (STM809/811) – Push-pull RST output (STM810/812)
■ 140 ms reset pulse width (min)
■ Low supply current - 6 µA (typ)
■ Guaranteed RST/RST assertion down to VCC = 1.0 V
■ Operating temperature: –40 °C to 85 °C (industrial grade)
■ Lead-free, small SOT23 and SOT143 package
STM809, STM810 STM811, STM812
Reset circuit
SOT23-3 (WX) SOT143-4 (W1)
Table 1.
Device summary Active-low reset
STM809
✔
STM810 STM811 STM812
✔
Active-high reset Manual reset input
✔ ✔
✔✔
Package SOT23-3 SOT23-3 SOT143-4 SOT143-4
January 2010
Doc ID 9873 Rev 5
1/21
www.st.com
1
Contents
Contents
STM809/810/811/812
1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Reset output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 Push-button reset input (STM811/812) . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3 Negative-going VCC transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.4 Valid RST output down to VCC = 0 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5 DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2/21 Doc ID 9873 Rev 5
STM809/810/811/812
List of tables
List of tables
Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10.
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 SOT23-3 – 3-lead small outline transistor package mechanical data. . . . . . . . . . . . . . . . . 16 SOT143-4 – 4-lead small outline transistor package mechanical data. . . . . . . . . . . . . . . . 17 O.