TS824CX5H RF Taiwan Semiconductor

TS823/824/825 Series Microprocessor Supervisory Circuit with Watchdog Timer & Manual Reset SOT-25 General Description The TS823/824/825 family allows the user to customize the CPU monitoring function without any external components. The user has a large choice of reset voltage thresholds and output driver configurations, all of which are present ant the factory. Each wafer is trimmed to the customers specifications. These circuits will ignore fast negative going transients on Vdd. The state of the reset output is guaranteed to be correct down to 1V. After Vdd crosses above a factory present threshold, the TS823/824/825 assert a reset signal. After a predetermined time (the reset interval) the reset is deasserted. If Vdd ever drops below the threshold voltage a reset is asserted immediately. In addition to a supply monitoring function the TS823/824/825 also monitor transitions at the watchdog (WDI) input. If a logic transition does not occur at the WDI pin within a certain time interval (the watchdog interval) then a reset is asserted. The reset deasserts after the reset interval, as explained earlier. The TS823/824/825 can both assert a reset manually by pulling the MR input to ground, and the micro-power quiescent current make this family a natural for portable battery powered equipment. Features Ordering Information Precision monitoring of +3V, +3.3V and +5V power Part No. Package Packing supply voltage TS823CX5x RF SOT-25 3Kpcs / 7 Reel Tight voltage threshold tolerance +/-1.5% TS824CX5x RF SOT-25 3Kpcs / 7 Reel Fully specified over temperature TS825CX5x RF SOT-25 3Kpcs / 7 Reel 210mS min. power-on reset pulse width Note: x is the threshold voltage type, option as 3uA(typ) supply current A : 4.63V B : 4.38V D : 3.08V E : 2.93V Guaranteed reset valid to Vdd = +1V F : 2.63V G : 2.32V H : 2.19V Power supply transient immunity Contact factory for additional voltage option No external components Pin Descriptions Applications Function TS823 TS824 TS825 Computers and Controllers RESET (Active-Low) 1 1 1 Embedded Controllers Ground 2 2 2 Intelligent instruments Manual Reset 3 - 4 Critical uP monitoring (RESET) (Active-High) - 3 3 Portable / Battery powered equipment Watchdog Input 4 4 - Automotive Systems Supply Voltage (Vdd) 5 5 5 Absolute Maximum Rating Parameter Symbol Maximum Unit Supply Voltage Vdd 6.0 V Supply Voltage - Recommended Vdd 0.9 ~ 5 V o Operating Junction Temperature Range T -40 ~ +125 C OP o Storage Temperature Range T -65 ~ +150 C STG o Thermal Resistance jc 256 C/W o Maximum Lead Temperature (260 C) T 10 S LEAD Notes: Stress above the listed absolute rating may cause permanent damage to the device. 1/8 Version: C07 TS823/824/825 Series Microprocessor Supervisory Circuit with Watchdog Timer & Manual Reset o Electrical Specifications (Ta = 25 C, unless otherwise noted) Parameter Conditions Symbol Min Typ Max Unit Input Supply Voltage Vdd 1.0 -- 5.5 V Supply Current WDI and MRB unconnected Idd -- 3 10 uA TS823/824/825CX5A 4.56 4.63 4.7 TS823/824/825CX5B 4.31 4.38 4.45 TS823/824/825CX5D 3.03 3.08 3.13 V V TS823/824/825CX5E 2.89 2.93 2.97 TH TS823/824/825CX5F 2.59 2.63 2.67 Reset Threshold TS823/824/825CX5G 2.28 2.32 2.36 TS823/824/825CX5H 2.15 2.19 2.23 RESET Output Voltage Low Vdd<V I =1.2mA, V -- -- 0.5 V TH(MIN), SINK OL (RESET) Output Voltage High Vdd> I =0.5mA V 0.8 Vdd -- -- V VTH(MAX), SOURCE OH Vdd to Reset Delay Vdd =V - 100mV T -- 40 -- uS TH D1 o o Reset Active Timeout Period Ta=-40 C ~+85 C T 140 210 280 mS D2 Watchdog Timeout Period T 1120 1760 2400 mS WD WDI Pulse Width T 50 -- -- nS WDI W -- -- 0.7 V DIIL WDI Input Threshold Vdd = V x 1.2 TH W 0.8 Vdd -- -- V DIIH W =0V I -15 -8 0.7 uA DI IL WDI Input Current W =Vdd = 5V I -- 8 15 uA DI IH M -- -- 0.7 V RIL MR Input Threshold Vdd=V x 1.2 TH M 0.8 Vdd -- -- V RIH MR Pulse Width T 1 -- -- uS WMR MR Noise Immunity Pulse width with no reset -- 100 -- nS MR to Reset Delay Vdd = V - 100mV T -- 500 -- nS TH DMR MR Pull Up Resistance 80 -- 120 K o o Input Supply Voltage Ta=-40 C~+85 C V 1.0 -- 5.5 V CC Detail Description Pin Function Pin Name Pin Description Reset Active Low GND Ground (Reset) Active High This pin is active low. Pulling this pin low to forces a reset. After a low to high transition reset remains MR asserted for exactly one reset timeout period. This pin is internally pulled high. If this function is unused then float this pin or tie it to Vdd. Watch Dog Input. Any transition on this pin will reset the Watch Dog timer. If this pin remains high or WDI low for longer than the Watch Dog interval then a reset is asserted. Float or tri-state this pin to disable the Watch Dog feature. Positive power supply. A reset is asserted after this voltage drops below a predetermined level. After Vdd Vdd rises above that level reset remains asserted until the end of the reset timeout period. 2/8 Version: C07