TECHNICAL DATA POWER SUPPLY CONTROL WITH BUILT-IN WATCHDOG TIMER KK1232 KK1232 is designed to monitor power supply within the system of reset signal generation for microprocessors. It is used in monitor systems for controlling various processes and entities. Packaged in 8-pin SOP or DIP. Features: • • • • Rated supply voltage 5.0 V Accurate 5% or 10% microprocessor power supply monitoring Programming of watchdog timer overflow time Generation of reset signals at power on for correct microproces sor start. ORDERING INFORMATION KK1232N Plastic KK1232D SOIC TA = -40° to 85° C for all packages. The chip contains reference voltage source, analog comparator, Watchdog timer, circuit for monitoring power supply deviation accuracy. . 08 Vcc PBRST 01 Functions: • • • Reset signal generation after power failure/ error Reset signal generation from external “RESET” pushbutton Reset signal generation from watchdog timer TD 02 07 ST TOL 03 06 RST GND 04 05 RST Fig 1 – PIN ASSIGNMENT Table 1 – Absolute maximum ratings Symbol Parameter Typical Units Min Max - 7.0 V V V VСС Supply voltage VIH VIL ТA Input voltage, high level Input voltage, low level Operating temperature range -1.0 -40 7.0 +85 °С Tstg Storage temperature -60 +125 °С 1 KK1232 Table 2 – Recommended operating conditions Symbol Typical Parameter Min Max Units VСС Supply voltage 4.5 5.5 V VIH VIL ТA Input voltage, high level Input voltage, low level Operating temperature range 2.0 -0.3 -20 UСС+0.3 0.8 +70 V V °С Table 3 DC electrical characteristics (TAmb = -40° to +85°С) Symbol Parameter ILIL1 Input leakage current, low level, ST, TOL ILIL2 Test conditions Typical Units min max VCC=5 V±10%, VIL=0 V - -1 µА Input leakage current, low level, TD VCC=5 V±10%, VIL=0 V - -300 µА ILIL3 Input leakage current, low level, PBRST VCC=5 V±10%, VIL=0 V - -1000 µА ILIH1 Input leakage current, high level, ST, TOL VCC =5 V±10%, VIH=VCC - 1 µА ILIH2 Input leakage current, high level, TD VCC =5 V±10%, VIH=VCC - 300 µА IOH Output current, high level, RST VCC =5 V±10%, VOH=2.4 V -8 - µА IOL Output current, low level, RST, RST VCC =5 V±10%, VOL=0.4 V 8 - mА VOH Output voltage, high level, RST VCC =5 V±10%, IOH= -500 µА VСС-0.5 - V VOH1 Output voltage, high level,- RST VCC =2 V, IOH= -500 µА VСС-0.5 - V VOL Output voltage, low level, RST Operating current VCC =2 V, IOL=1 mА - 0.4 V VCC =5 V±10% - 2 mА VCC TP1 VCC trip point VCC TP2 VCC trip point TOL = GND TOL = VCC 4.5 4.25 4.74 4.49 V V IСС 2 KK1232 Table 4 – AC electrical characteristics (Тamb = from -40 to +85 °С) Symbol tTD1 Parameter Typical Test conditions Watchdog timer overflow time tTD2 tTD3 tPDLY PBRST stable low to RST and RST tRST Reset active time tRPD VCC fail detect to RST and RST tRPU VCC detect to RST and RST transition Units min max 62.5 250 tST≥20 ns TD = GND TD disconnected TD = VCC ms 250 500 1000 2000 VCC =5.0 V±10% - 20 ms ms ms 250 1000 ms - 175 µs 250 1000 ms VCC =5.0 V±10% tPB≥20 ms VCC =5.0 V±10% tPB≥20 ms VCC =from 5.0 to 4.0 V tF≥10 µs VCC = from 5.0 to 4.0 V tR≥1 µs Table 5 – Pin description Pin Symbol Description 01 PBRST 02 TD 03 TOL Selects 5% or 10% VCC Detect 04 GND Ground 05 RST Reset output (Active High) 06 RST Reset output (Active Low, open drain) 07 ST Strobe Input 08 VCC Supply output from voltage source Pushbutton reset input Time Delay Set 3 KK1232 tPB ______ PBRST tPDLY VIH VIL tRST ____ RST RST tPB≥20 ms tPDLY≤20 ms 250 ms≤tRST≤1000 ms Fig. 2 – Timing diagram of forming reset signal from external PBRST control button ___ ST Invalid strob Indeterminate strob Valid strob MAX MIN t ST t TD1 - t TD3 RST tST ≥20 нс 62.5 ms≤ tTD1 ≤250 ms 250 ms≤ tTD2 ≤1000 ms 500 ms≤ tTD3 ≤2000 ms Fig. 3 – Timing diagram : Strobe input 4 KK1232 tF VCC 4.75 V 4.5 V 4.25 V ____ RST tRPD VOH RST µs tF ≥10 V tRPD ≤175 µs OL Fig. 4 – Timing diagram: power error / down to VCCTP tR 4.75 V VCCTP 4.25 V tRPU VCC RST RST VOH tR ≥1 µs 250 ms≤ tRPU ≤1000 ms VOL Fig. 5 – Timing diagram: Power-Up/ Stable 5 KK1232 ST Watchdog timer TD VCC TOL Vcc tolerance Bias Referance voltage source + - RST RST PBRST GND Fig.6 Block diagram KK1232 Fig.7 Application Circuit : Watchdog Timer 6 KK1232 N SUFFIX PLASTIC DIP (MS – 001BA) A Dimension, mm 5 8 B 1 4 MIN MAX A 8.51 10.16 B 6.1 7.11 5.33 C L F Symbol C D 0.36 0.56 F 1.14 1.78 -T- SEATING PLANE N G M K 0.25 (0.010) M J H D T NOTES: 1. Dimensions “A”, “B” do not include mold flash or protrusions. Maximum mold flash or protrusions 0.25 mm (0.010) per side. G 2.54 H 7.62 J 0° 10° K 2.92 3.81 L 7.62 8.26 M 0.2 0.36 N 0.38 D SUFFIX SOIC (MS - 012AA) Dimension, mm A 8 5 B H 1 G P 4 D K MIN MAX A 4.8 5 B 3.8 4 C 1.35 1.75 D 0.33 0.51 F 0.4 1.27 R x 45 C -T- Symbol SEATING PLANE J F 0.25 (0.010) M T C M M G 1.27 H 5.72 J 0° 8° K 0.1 0.25 1. Dimensions A and B do not include mold flash or protrusion. M 0.19 0.25 2. Maximum mold flash or protrusion 0.15 mm (0.006) per side for A; for B ‑ 0.25 mm (0.010) per side. P 5.8 6.2 R 0.25 0.5 NOTES: 7