795S datasheet, PDF - EEWORLD Datasheet

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795S: Description1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8; Categorysemiconductor Analog mixed-signal IC; File Size294KB，32 Pages; ManufacturerSTMicroelectronics; Websitehttp://www.st.com/

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795S Overview

1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8

795S Parametric

Parameter Name	Attribute value
Number of functions	1
Number of terminals	8
Maximum operating temperature	85 Cel
Minimum operating temperature	-40 Cel
Maximum supply/operating voltage	5.5 V
Minimum supply/operating voltage	1.1 V
Rated supply voltage	3.6 V
Processing package description	0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8
Lead-free	Yes
EU RoHS regulations	Yes
state	ACTIVE
packaging shape	RECTANGULAR
Package Size	SMALL OUTLINE
surface mount	Yes
Terminal form	GULL WING
Terminal spacing	1.27 mm
terminal coating	NICKEL PALLADIUM GOLD
Terminal location	DUAL
Packaging Materials	PLASTIC/EPOXY
Temperature level	INDUSTRIAL
Number of channels	1
Analog IC other types	POWER SUPPLY SUPPORT CKT

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STM690, STM704, STM795

STM802, STM804, STM805, STM806

3V Supervisor with Battery Switchover

FEATURES SUMMARY

■

RST OR RST OUTPUTS

NVRAM SUPERVISOR FOR EXTERNAL

LPSRAM

CHIP-ENABLE GATING (STM795 only) FOR

EXTERNAL LPSRAM (7ns max PROP

DELAY)

MANUAL (PUSH-BUTTON) RESET INPUT

200ms (TYP) t

rec

WATCHDOG TIMER - 1.6sec (TYP)

AUTOMATIC BATTERY SWITCHOVER

LOW BATTERY SUPPLY CURRENT - 0.4µA

(TYP)

POWER-FAIL COMPARATOR (PFI/PFO)

LOW SUPPLY CURRENT - 40µA (TYP)

GUARANTEED RST (RST) ASSERTION

DOWN TO V

= 1.0V

OPERATING TEMPERATURE:

–40°C to 85°C (Industrial Grade)

Figure 1. Packages

SO8 (M)

TSSOP8 3x3 (DS)*

Table 1. Device Options

Watchdog

Input

STM690T/S/R

STM704T/S/R

STM795T/S/R

STM802T/S/R

STM804T/S/R

STM805T/S/R

STM806T/S/R

✔

Active-

Low RST

(1)

✔

(2)

✔

(2)

✔

(2)

✔

Active-

High

RST

Manual

Battery

Reset Input Switch-over

✔

Power-fail

Compar-

ator

✔

Chip-

Enable

Gating

Note: 1. All RST outputs push-pull (unless otherwise noted)

2. Open drain output.

* Contact local ST sales office for availability.

Rev 7

April 2006

1/32

STM690/704/795/802/804/805/806

TABLE OF CONTENTS

FEATURES SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 1. Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Table 1. Device Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

SUMMARY DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Figure 2. Logic Diagram (STM690/802/804/805) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Figure 3. Logic Diagram (STM704/806) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Figure 4. Logic Diagram (STM795). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Table 2. Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Figure 5. STM690/802/804/805 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 6. STM704/806 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 7. STM795 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 3. Pin Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 8. Block Diagram (STM690/802/804/805) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 9. Block Diagram (STM704/806) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 10.Block Diagram (STM795) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 11.Hardware Hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Reset Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Push-button Reset Input (STM704/806). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Watchdog Input (NOT available on STM704/795/806) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Back-up Battery Switchover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Table 4. I/O Status in Battery Back-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Chip-Enable Gating (STM795 only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Chip Enable Input (STM795 only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Chip Enable Output (STM795 only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 12.Chip-Enable Gating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 13.Chip Enable Waveform (STM795) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Power-fail Input/Output (NOT available on STM795) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Applications Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 14.Power-fail Comparator Waveform (STM690/704/802/804/805/806) . . . . . . . . . . . . . . . . 11

Using a SuperCap™ as a Backup Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 15.Using a SuperCap™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Negative-Going V

Transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

TYPICAL OPERATING CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 16.V

-to-V

OUT

On-Resistance vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 17.V

BAT

-to-V

OUT

On-Resistance vs. Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 18.Supply Current vs. Temperature (no load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 19.Battery Current vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 20.V

PFI

Threshold vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2/32

STM690/704/795/802/804/805/806

Figure 21.Reset Comparator Propagation Delay vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 22.Power-up t

rec

vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 23.Normalized Reset Threshold vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 24.Watchdog Time-out Period vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 25.E to E

CON

On-Resistance vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 26.PFI to PFO Propagation Delay vs. Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 27.Output Voltage vs. Load Current (V

= 5V; V

BAT

= 2.8V; T

= 25°C). . . . . . . . . . . . . . 18

Figure 28.Output Voltage vs. Load Current (V

= 0V; V

BAT

= 2.8V; T

= 25°C). . . . . . . . . . . . . . 19

Figure 29.RST Output Voltage vs. Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 30.RST Output Voltage vs. Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 31.Power-fail Comparator Response Time (Assertion) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 32.Power-fail Comparator Response Time (De-Assertion) . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 33.Maximum Transient Duration vs. Reset Threshold Overdrive. . . . . . . . . . . . . . . . . . . . . 21

Figure 34.E to E

CON

Propagation Delay vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

MAXIMUM RATING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Table 5. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

DC and AC PARAMETERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Table 6. Operating and AC Measurement Conditions . . . . . . . . . . . . . . . . . . . . . . . .

Figure 35.E to ECON Propagation Delay Test Circuit. . . . . . . . . . . . . . . . . . . . . . . . .

Figure 36.AC Testing Input/Output Waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 37.MR Timing Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 38.Watchdog Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 7. DC and AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

......

. . . . 23

. . . . 24

PACKAGE MECHANICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Figure 39.SO8 – 8-lead Plastic Small Outline, 150 mils body width, Package Mech. Drawing. . . . 27

Table 8. SO8 – 8-lead Plastic Small Outline, 150 mils body width, Package Mechanical Data . . 27

Figure 40.TSSOP8 – 8-lead, Thin Shrink Small Outline, 3x3mm body size, Outline . . . . . . . . . . . 28

Table 9. TSSOP8 – 8-lead, Thin Shrink Small Outline, 3x3mm body size, Mechanical Data . . . . 28

PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Table 10. Ordering Information Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Table 11. Marking Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

REVISION HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Table 12. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

3/32

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