STM804 STMICROELECTRONICS [STMicroelectronics], STM804 Datasheet
STM804
Available stocks
Related parts for STM804
STM804 Summary of contents
Page 1
... STM802, STM804, STM805, STM806 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 ...
Page 2
STM690/704/795/802/804/805/806 TABLE OF CONTENTS FEATURES SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
Page 3
Figure 21.Normalized Reset Threshold vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Figure ...
Page 4
... RST). These devices also offer Figure 2. Logic Diagram (STM690/802/804/805 BAT WDI STM690/ 802/804/ PFI 805 V SS Note: 1. For STM804/805, reset output is active-high and open drain. Figure 3. Logic Diagram (STM704/806 BAT MR STM704 STM806 PFI V SS 4/31 ...
Page 5
... Figure 5. STM690/802/804/805 Connections SO8/TSSOP8 OUT PFI 4 5 Note: 1. For STM804/805, reset output is active-high and open drain. Figure 6. STM704/806 Connections V BAT (1) RST(RST) WDI PFO AI08849 Figure 7. STM795 Connections STM690/704/795/802/804/805/806 SO8/TSSOP8 OUT BAT V RST ...
Page 6
... CC goes high, whichever occurs first. In the disabled mode, E falls below the When V BAT from V CC hysteresis, V ceed V CC Name STM804 STM805 – MR Push-button Reset Input 6 WDI Watchdog Input – RST Active-Low Reset Output 7 RST Active-High Reset Output 4 PFI ...
Page 7
... Figure 8. Block Diagram (STM690/802/804/805 BAT WDI PFI Note: 1. For STM804/805, reset output is active-high and open drain. Figure 9. Block Diagram (STM704/806 BAT MR PFI V COMPARE SO COMPARE V RST WATCHDOG TIMER V COMPARE PFI COMPARE V SO COMPARE V RST V COMPARE PFI STM690/704/795/802/804/805/806 V OUT t rec (1) RST(RST) ...
Page 8
STM690/704/795/802/804/805/806 Figure 10. Block Diagram (STM795 BAT E PFI Figure 11. Hardware Hookup Regulator Unregulated V Voltage IN From Microprocessor R1 R2 Note: 1. For STM690/802/804/805. 2. For STM795 only. 3. Not available on STM795. 4. For ...
Page 9
... MCU whenever V goes below the reset threshold (V CC watchdog time-out occurs, or when the Push-but- ton Reset Input (MR) is taken low. RST is guaran- teed logic low (logic high for STM804/805) for 0V < V < RST ...
Page 10
STM690/704/795/802/804/805/806 Chip-Enable Gating (STM795 only) Internal gating of the chip enable (E) signal pre- vents erroneous data from corrupting the external CMOS RAM in the event of an undervoltage con- dition. The STM795 uses a series transmission gate from E ...
Page 11
Power-fail Input/Output (NOT available on STM795) The Power-fail Input (PFI) is compared to an inter- nal reference voltage (independent from the V comparator). If PFI is less than the power-fail threshold (V ), the Power-Fail Output (PFO) will PFI go ...
Page 12
STM690/704/795/802/804/805/806 Using a SuperCap™ Backup Power Source SuperCaps™ are capacitors with extremely high capacitance values (e.g., order of 0.47F) for their size. Figure 15 shows how to use a SuperCap as a back-up power source. The SuperCap may ...
Page 13
TYPICAL OPERATING CHARACTERISTICS Note: Typical values are Figure 16. V -to-V On-Resistance vs. Temperature BAT OUT 220 200 180 160 140 120 100 –60 –40 –20 Figure 17. Supply Current vs. Temperature (no ...
Page 14
STM690/704/795/802/804/805/806 Figure 18. V Threshold vs. Temperature PFI 1.255 1.250 1.245 1.240 1.235 1.230 1.225 –50 –30 Figure 19. Reset Comparator Propagation Delay vs. Temperature –60 –40 Figure 20. Power-up t vs. ...
Page 15
Figure 21. Normalized Reset Threshold vs. Temperature 1.002 1.000 0.998 0.996 0.994 –60 –40 Figure 22. Watchdog Time-out Period vs. Temperature 1.74 1.72 1.70 1.68 1.66 1.64 1.62 1.60 1.58 1.56 –50 –30 Figure 23 On-Resistance vs. ...
Page 16
STM690/704/795/802/804/805/806 Figure 24. PFI to PFO Propagation Delay vs. Temperature –60 –40 –20 Figure 25. RST Output Voltage vs. Supply Voltage RST ...
Page 17
Figure 26. RST Output Voltage vs. Supply Voltage RST 1 0 Figure 27. RST Response Time (Assertion 500 ms/div 2 µs/div STM690/704/795/802/804/805/806 AI09150 V CC ...
Page 18
STM690/704/795/802/804/805/806 Figure 28. RESET Response Time (Assertion Figure 29. Power-fail Comparator Response Time (Assertion PFI 18/31 V RST 2µs/div PFO 2µs/div AI09152 1.45 1.40 ...
Page 19
Figure 30. Power-fail Comparator Response Time (De-Assertion PFI Figure 31 Reset Propagation Delay vs. Temperature –60 –40 PFO 2 µs/div – ...
Page 20
STM690/704/795/802/804/805/806 Figure 32. Maximum Transient Duration vs. Reset Threshold Overdrive 250 200 150 100 RESET COMPARATOR OVERDRIVE, V Figure 33 Propagation Delay vs. Temperature CON 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 –60 ...
Page 21
MAXIMUM RATING Stressing the device above the rating listed in the Absolute Maximum Ratings” table may cause per- manent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above ...
Page 22
STM690/704/795/802/804/805/806 Figure 34 Propagation Delay Test Circuit CON Note includes load capacitance and scope probe capacitance. L Figure 35. AC Testing Input/Output Waveforms 0.8V CC 0.2V CC Figure 36. MR Timing Waveform MR tMLRL (1) ...
Page 23
... CC V BAT I = 250µ 2.3V OUT2 BAT 0 1mA 2.3V OUT2 BAT STM704/806 only 0V – – STM804/805/795; –1 ( (max) < V < 5.5V 0.7V RST CC V (max) < V < 5.5V RST CC AI07891 Typ Max Unit (3) 5 µ µ ...
Page 24
STM690/704/795/802/804/805/806 Alter- Sym Description native Output Low Voltage (PFO, RST, RST, Vccsw Output Low Voltage (E V Output Low Voltage (RST) OL Output High Voltage (RST, (7) RST) V Output High Voltage (E OH Output High Voltage (PFO) ...
Page 25
... Tested 3.6V 3.5V and 0V. BAT CC 5. Guaranteed by design. 6. The leakage current measured on the RST pin (STM804/805) or RST pin (STM795) is tested with the reset output not asserted (output high impedance). 7. Not valid for STM795/804/805 (open drain). 8. When V > V > BAT CC ...
Page 26
STM690/704/795/802/804/805/806 PACKAGE MECHANICAL Figure 38. SO8 – 8-lead Plastic Small Outline, 150 mils body width, Package Mech. Drawing Note: Drawing is not to scale. Table 8. SO8 – 8-lead Plastic Small Outline, 150 mils ...
Page 27
Figure 39. TSSOP8 – 8-lead, Thin Shrink Small Outline, 3x3mm body size, Outline Note: Drawing is not to scale. Table 9. TSSOP8 – 8-lead, Thin Shrink Small Outline, 3x3mm body size, Mechanical Data Symb Typ ...
Page 28
STM690/704/795/802/804/805/806 PART NUMBERING Table 10. Ordering Information Scheme Example: Device Type STM690/704/795/802/804/805/806 Reset Threshold Voltage T = STM690/704/795/805 = V RST STM802/804/806 = V = 3.00V to 3.12V RST S = STM690/704/795/805 = V RST STM802/804/806 = V = 2.88V ...
Page 29
... Table 11. Marking Description Part Number STM690T STM690S STM690R STM704T STM704S STM704R STM795T STM795S STM795R STM802T STM802S STM802R STM804T STM804S STM804R STM805T STM805S STM805R STM806T STM806S STM806R Reset Threshold 3.075 2.925 2.625 3.075 2.925 2.625 3.075 2.925 2.625 3.075 2.925 2.625 3.075 2 ...
Page 30
STM690/704/795/802/804/805/806 REVISION HISTORY Table 12. Document Revision History Date Version October 31, 2003 1.0 22-Dec-03 2.0 16-Jan-04 2.1 07-Apr-04 2.2 25-May-04 3.0 02-Jul-04 4.0 29-Sep-04 5.0 30/31 Revision Details First Issue Reformatted; update characteristics (Figure 11, 13, ...
Page 31
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. ...