Datasheet
Table Of Contents
- Table 1. Device summary
- 1 Description
- Figure 1. Logic diagram (STM6717/18)
- Figure 2. Logic diagram (STM6777/78)
- Figure 3. Logic diagram (STM6719/20)
- Figure 4. Logic diagram (STM6779/80)
- Table 2. Signal names
- Figure 5. STM6717/18 SOT23-5 connections
- Figure 6. STM6777/78 SOT23-6 connections
- Figure 7. STM6719/20 SOT23-6 connections
- Figure 8. STM6779/80 SOT23-6 connections
- 1.1 Pin descriptions
- 1.1.1 Active-low, push-pull reset output (RST) - STM6718/20/78/80
- 1.1.2 Active-low, open drain reset output (RST) - STM6717/19/77/79
- 1.1.3 Push-button reset input (MR)
- 1.1.4 Manual reset delay input (MRC) - STM6777/78/79/80)
- 1.1.5 Primary supply voltage monitoring input (VCC1)
- 1.1.6 Secondary supply voltage monitoring input (VCC2)
- 1.1.7 Adjustable reset comparator input (RSTIN; STM6719/20/79/80)
- 2 Operation
- 3 Typical operating characteristics
- Figure 13. Supply current vs. temperature (VCC1 = 5.5 V; VCC2 = 3.6 V)
- Figure 14. Supply current vs. temperature (VCC1 = 3.6 V; VCC2 = 2.75 V)
- Figure 15. Supply current vs. temperature (VCC1 = 3.0 V; VCC2 = 2.0 V)
- Figure 16. Supply current vs. temperature (VCC1 = 2.0 V; VCC2 = 1.0 V)
- Figure 17. Normalized VCC reset time-out period vs. temperature
- Figure 18. Maximum VCC transient duration vs. reset threshold overdrive
- Figure 19. Normalized VRST1 threshold vs. temperature
- Figure 20. Normalized VRST2 threshold vs. temperature
- Figure 21. Reset input threshold vs. temperature
- Figure 22. VCC1-to-reset delay vs. temperature
- Figure 23. Reset input-to-reset output delay vs. temperature
- Figure 24. MR-to-reset output delay vs. temperature (VCC1 = 3.6V)
- 4 Maximum rating
- 5 DC and AC parameters
- 6 Package mechanical data
- Figure 28. SOT23-5 - 5-lead small outline transistor package mechanical drawing
- Table 8. SOT23-5 - 5-lead small outline transistor package mechanical data
- Figure 29. SOT23-6 - 6-lead small outline transistor package mechanical drawing
- Table 9. SOT23-6 - 6-lead small outline transistor package mechanical data
- Figure 30. Carrier tape for SOT23-5L and SOT23-6L
- Table 10. Carrier tape dimensions for SOT23-5L and SOT23-6L
- 7 Part numbering
- 8 Revision history
Description STM6717/6718/6719/6720/STM6777/6778/6779/6780
8/30 Doc ID 11469 Rev 8
V
CC1
. It can be driven from a TTL or CMOS logic line, or with open drain/collector outputs,
or connected to V
SS
through a switch. If unused, leave this pin open or connect it to V
CC1
.
Connect a normally open momentary switch from MR
to V
SS
; external debounce circuitry is
not required. (If MR
is driven from long cables or if the device is used in noisy environments,
connecting a 0.1µF capacitor from MR
to V
SS
provides additional noise immunity.
1.1.4 Manual reset delay input (MRC) - STM6777/78/79/80)
This pin is either left open or connected to V
SS
via a capacitor. By selecting the appropriate
capacitor, the manual reset process, initiated by pressing the push-button manual reset
input, can be delayed by any value from 6 µs or more (see Table 7 on page 21).
1.1.5 Primary supply voltage monitoring input (V
CC1
)
It also is the input for the primary reset threshold monitor. Available fixed (customer-
selectable, factory-programmed) reset thresholds include 4.63 V to 1.58 V.
1.1.6 Secondary supply voltage monitoring input (V
CC2
)
This function is available on the STM6717/18/19/20/77/78. Fixed (customer-selectable,
factory-programmed) reset thresholds include 3.08 V to 0.79 V.
1.1.7 Adjustable reset comparator input (RSTIN; STM6719/20/79/80)
This is a high impedance input. RST is driven low when the voltage at the RSTIN pin falls
below 0.626 V (internal reference voltage at this comparator). The monitored voltage reset
threshold is set with an external resistor-divider network.
Table 3. Pin functions
Pin
Name Function
STM6717
STM6718
STM6719
STM6720
STM6777
STM6778
STM6779
STM6780
1111RST
Active-low reset output
3333MR
Push-button reset input
— — 5 4 MRC Manual reset delay input
5666V
CC1
Primary supply voltage input
444—V
CC2
Secondary supply voltage input
— 5 — 5 RSTIN Adjustable reset comparator input
2222V
SS
Ground