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TC1232EOE Scheda tecnica(PDF) 3 Page - TelCom Semiconductor, Inc |
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TC1232EOE Scheda tecnica(HTML) 3 Page - TelCom Semiconductor, Inc |
3 / 6 page 5-21 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 AC ELECTRICAL CHARACTERISTICS: (Cont.) TA = TMIN to TMAX; VCC = +5V to +10%, unless otherwise specified. Symbol Parameter Test Conditions Min Typ Max Units tR VCC Rise Time (Note 4) Figure 6 0 — — µsec tRPD VCC Detect to RST High Figure 7, VCC Falling — — 100 nsec and RST Low tRPU VCC Detect to RST High Figure 8, VCC Rising 250 610 1000 msec and RST Open (Note 6) PIN DESCRIPTION Pin No. Pin No. Pin No. (8-Pin PDIP) (8-Pin SOIC) (16-Pin SOIC) Symbol Description 1 1 2 PB RST Push-button Reset Input. A debounced active-low input that ignores pulses less than 1msec in duration and is guaranteed to recognize inputs of 20msec or greater. 2 2 4 TD Time Delay Set. The watchdog time-out select input (tTD = 150msec for TD = 0V, tTD = 600msec for TD = open, tTD = 1.2sec for TD = VCC). 3 3 6 TOL Tolerance Input. Connect to GND for 5% tolerance or to VCC for 10% tolerance. 4 4 8 GND Ground. 5 5 9 RST Reset Output (Active High) - goes active: 1. If VCC falls below the selected reset voltage threshold 2. If PB RST is forced low 3. If ST is not strobed within the minimum time-out period 4. During power-up 6 6 11 RST Reset Output (Active Low, Open Drain) - see RST. 7 7 13 ST Strobe Input. Input for watchdog timer. 88 15 VCC The +5V Power-Supply Input. 1, 3, 5, 7, 10, NC No Internal Connection. 12, 14, 16 NOTES: 1. PB RST is internally pulled up to VCC with an internal impedance of typically 40kΩ. 2. Measured with outputs open. 3. All voltages referenced to GND. 4. Guaranteed by design. 5. PB RST must be held low for a minimum of 20msec to guarantee a reset. 6. tR = 5µsec. 1 8 2 7 3 6 4 5 TC1232CPA TC1232EPA RST RST GND TOL TD PB RST RST ST VCC RST ST 18 27 36 45 RST GND TOL TD PB RST RST ST VCC PB RST TC1232COA TC1232EOA V 1 2 3 4 5 6 7 8 16 13 12 11 10 9 NC TD NC NC 15 14 TOL GND NC NC NC TC1232COE TC1232EOE NC CC NC 16-Pin SOIC Wide 8-Pin PDIP 8-Pin SOIC PIN CONFIGURATIONS TC1232 MICROPROCESSOR MONITOR |
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