IMP706P/R/S/T/J IMP708R/S/T/J MAX706P/R/S/T MAX708R/S/T IMP706P/R IMP708R - Datasheet Archive

 

POWER MANAGEMENT Key Features 3/3.3/4.0V µP Supervisor Circuits ­ ­ ­ Lo w suppl y cur r ent Watc hdog timer Br

 

IMP706P/R/S/T/J IMP706P/R/S/T/J, IMP708R/S/T/J IMP708R/S/T/J POWER MANAGEMENT Key Features 3/3.3/4.0V µP Supervisor Circuits ­ ­ ­ Lo w suppl y cur r ent Watc hdog timer Br o wnout det ection N Lower power, pin compatible replacements for Maxim MAX706P/R/S/T MAX706P/R/S/T, MAX708R/S/T MAX708R/S/T ­ 30% lower supply current:140µA vs. 200µA N Precision power supply monitor ­ 2.63V threshold (IMP706P/R IMP706P/R, IMP708R IMP708R) ­ 2.93V threshold (IMP706S IMP706S, IMP708S IMP708S) ­ 3.08V threshold (IMP706T IMP706T, IMP708T IMP708T) ­ New 4.00V threshold (IMP706J IMP706J, IMP708J IMP708J) N Debounced manual reset input N Auxiliary voltage monitor comparator ­ 1.25V threshold ­ Battery monitor/auxiliary supply monitor N Watchdog timer (IMP706P/R/S/T/J IMP706P/R/S/T/J) ­ Watchdog can be disabled by floating WDI N 200ms reset time delay N Three reset signal options ­ Active HIGH: IMP706P IMP706P ­ Active LOW: IMP706R/S/T/J IMP706R/S/T/J ­ Active HIGH & LOW outputs: IMP708R/S/T/J IMP708R/S/T/J N DIP, SO and MicroSO packages N Guaranteed RESET assertion to VCC = 1.1V The IMP706P/R/S/T/J IMP706P/R/S/T/J and IMP708R/S/T/J IMP708R/S/T/J CMOS supervisor circuits monitor power-supply and battery voltage level, and µP/µC operation. A reset is generated when the supply drops below 2.63V (IMP706P/R IMP706P/R, IMP708R IMP708R), 2.93V (IMP706S IMP706S, IMP708S IMP708S), 3.08V (IMP706T IMP706T, IMP708T IMP708T) or 4.00 (IMP706J IMP706J, IMP708J IMP708J). The family offers several functional options. Each device generates a reset signal during power-up, power-down and during brownout conditions. In addition, the IMP706P/R/S/T/J IMP706P/R/S/T/J feature a 1.6 second watchdog timer. The watchdog timer output will trigger a reset if connected to MR. Unlike competitive devices, floating the WDI input pin disables the watchdog timer. The IMP708R/S/T/J IMP708R/S/T/J have both active-HIGH and active-LOW reset outputs but no watchdog function. The IMP706P IMP706P has the same pin-out and functions as the IMP706R IMP706R but has an active-HIGH reset output. A versatile power-fail circuit, useful in checking battery levels and non-5V supplies, has a 1.25V threshold. All devices have a manual reset input. Applications All devices are available in 8-pin DIP, SO and the compact MicroSO packages. The MicroSO package requires 50% less PC board area than the conventional SO package. N N N N N N N Block Diagrams Transition Detector WDI Watchdog Timer Computers and controllers CTI applications Embedded controllers Battery operated systems Intelligent instruments Wireless communication systems PDAs and handheld equipment WDO RESET VCC VCC Timebase 20k 20k RESET Generator MR RESET (RESET) IMP706P IMP706P + VCC + RESET Generator + 1.25V RESET + VCC ­ 2.63V (IMP706P/R IMP706P/R) 2.93V (IMP706S IMP706S) 3.08V (IMP706T IMP706T) 4.00V (IMP706J IMP706J) PFI MR ­ 2.63V (IMP708R IMP708R) 2.93V (IMP708S IMP708S) 3.08V (IMP708T IMP708T) 4.00V (IMP708J IMP708J) + PFO ­ + PFI PFO 1.25V ­ IMP708R/S/T/J IMP708R/S/T/J IMP706P/R/S/T/J IMP706P/R/S/T/J 706P_02.eps GND Daily Silver IMP GND 706P_01.eps www.ds-imp.com.cn 1 IMP706P/R/S/T/J IMP706P/R/S/T/J, IMP708R/S/T/J IMP708R/S/T/J Pin Configuration MicroSO DIP/SO MR 3 PFI 4 RESET MR 1 7 2 GND 8 1 VCC RESET VCC 2 6 NC GND 3 5 PFO PFI 4 IMP708R/S/T/J IMP708R/S/T/J (RESET) RESET (IMP706P IMP706P) WDO 1 WDI MR 3 PFO VCC 4 8 WDO 7 RESET 3 6 4 5 8 WDO MR 1 7 RESET VCC 2 6 WDI GND 5 PFO PFI IMP706P IMP706P IMP706R/S/T/J IMP706R/S/T/J 2 8 WDI RESET 1 7 PFO RESET 2 6 PFI MR 5 IMP706P IMP706P IMP706R/S/T/J IMP706R/S/T/J GND VCC 8 NC 7 PFO 3 6 PFI 4 5 GND IMP708R/S/T/J IMP708R/S/T/J 706P_03.eps Ordering Information Part Number IMP706PCPA IMP706PCPA IMP706PCSA IMP706PCSA IMP706PCUA IMP706PCUA IMP706PEPA IMP706PEPA IMP706PESA IMP706PESA IMP706RCPA IMP706RCPA IMP706RCSA IMP706RCSA IMP706RCUA IMP706RCUA IMP706REPA IMP706REPA IMP706RESA IMP706RESA IMP706SCPA IMP706SCPA IMP706SCSA IMP706SCSA IMP706SCUA IMP706SCUA IMP706SEPA IMP706SEPA IMP706SESA IMP706SESA IMP706TCPA IMP706TCPA IMP706TCSA IMP706TCSA IMP706TCUA IMP706TCUA IMP706TEPA IMP706TEPA IMP706TESA IMP706TESA IMP706JCPA IMP706JCPA IMP706JCSA IMP706JCSA IMP706JCUA IMP706JCUA IMP706JEPA IMP706JEPA IMP706JESA IMP706JESA IMP708RCPA IMP708RCPA IMP708RCSA IMP708RCSA IMP708RCUA IMP708RCUA IMP708REPA IMP708REPA IMP708RESA IMP708RESA IMP708SCPA IMP708SCPA IMP708SCSA IMP708SCSA IMP708SCUA IMP708SCUA IMP708SEPA IMP708SEPA IMP708SESA IMP708SESA IMP708TCPA IMP708TCPA IMP708TCSA IMP708TCSA IMP708TCUA IMP708TCUA IMP708TEPA IMP708TEPA IMP708TESA IMP708TESA IMP708JCPA IMP708JCPA IMP708JCSA IMP708JCSA IMP708JCUA IMP708JCUA IMP708JEPA IMP708JEPA IMP708JESA IMP708JESA 2 Package Operating Temperature Range Reset Threshold Reset Polarity Watchdog Timer 8-Plastic DIP 8-SO 8-MicroSO 8-Plastic DIP 8-SO 8-Plastic DIP 8-SO 8-MicroSO 8-Plastic DIP 8-SO 8-Plastic DIP 8-SO 8-MicroSO 8-Plastic DIP 8-SO 8-Plastic DIP 8-SO 8-MicroSO 8-Plastic DIP 8-SO 8-Plastic DIP 8-SO 8-MicroSO 8-Plastic DIP 8-SO 8-Plastic DIP 8-SO 8-MicroSO 8-Plastic DIP 8-SO 8-Plastic DIP 8-SO 8-MicroSO 8-Plastic DIP 8-SO 8-Plastic DIP 8-SO 8-MicroSO 8-Plastic DIP 8-SO 8-Plastic DIP 8-SO 8-MicroSO 8-Plastic DIP 8-SO 0°C to +70°C 0°C to +70°C 0°C to +70°C ­40°C to +85°C ­40°C to +85°C 0°C to +70°C 0°C to +70°C 0°C to +70°C ­40°C to +85°C ­40°C to +85°C 0°C to +70°C 0°C to +70°C 0°C to +70°C ­40°C to +85°C ­40°C to +85°C 0°C to +70°C 0°C to +70°C 0°C to +70°C ­40°C to +85°C ­40°C to +85°C 0°C to +70°C 0°C to +70°C 0°C to +70°C ­40°C to +85°C ­40°C to +85°C 0°C to +70°C 0°C to +70°C 0°C to +70°C ­40°C to +85°C ­40°C to +85°C 0°C to +70°C 0°C to +70°C 0°C to +70°C ­40°C to +85°C ­40°C to +85°C 0°C to +70°C 0°C to +70°C 0°C to +70°C ­40°C to +85°C ­40°C to +85°C 0°C to +70°C 0°C to +70°C 0°C to +70°C ­40°C to +85°C ­40°C to +85°C 2.63 2.63 2.63 2.63 2.63 2.63 2.63 2.63 2.63 2.63 2.93 2.93 2.93 2.93 2.93 3.08 3.08 3.08 3.08 3.08 4.00 4.00 4.00 4.00 4.00 2.63 2.63 2.63 2.63 2.63 2.93 2.93 2.93 2.93 2.93 3.08 3.08 3.08 3.08 3.08 4.00 4.00 4.00 4.00 4.00 HIGH HIGH HIGH HIGH HIGH LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW Dual: HIGH & LOW Dual: HIGH & LOW Dual: HIGH & LOW Dual: HIGH & LOW Dual: HIGH & LOW Dual: HIGH & LOW Dual: HIGH & LOW Dual: HIGH & LOW Dual: HIGH & LOW Dual: HIGH & LOW Dual: HIGH & LOW Dual: HIGH & LOW Dual: HIGH & LOW Dual: HIGH & LOW Dual: HIGH & LOW Dual: HIGH & LOW Dual: HIGH & LOW Dual: HIGH & LOW Dual: HIGH & LOW Dual: HIGH & LOW YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO www.ds-imp.com.cn Daily Silver IMP IMP706P/R/S/T/J IMP706P/R/S/T/J, IMP708R/S/T/J IMP708R/S/T/J Absolute Maximum Ratings Pin Terminal Voltage with Respect to Ground VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ­0.3V to 6.0V All other inputs . . . . . . . . . . . . . . . . . . . . . . . . ­0.3V to (VCC + 0.3V) Input Current at VCC and GND . . . . . . . . . . 20mA Output Current: All outputs . . . . . . . . . . . . . 20mA Rate of Rise at VCC . . . . . . . . . . . . . . . . . . . . . 100V/µs Plastic DIP Power Dissipation . . . . . . . . . . . 700mW (Derate 9mW/°C above 70°C) SO Power Dissipation . . . . . . . . . . . . . . . . . . 470mW (Derate 5.9mW/°C above 70°C) MicroSO Power Dissipation . . . . . . . . . . . . . 330mW (Derate 4.1mW/°C above 70°C) Operating Temperature Range IMP706xE, IMP708xE . . . . . . . . . . . . . . . . . . ­40°C to +85°C IMP706xC, IMP708xC . . . . . . . . . . . . . . . . . . 0°C to +70°C Storage Temperature Range . . . . . . . . . . . . . . ­65°C to +160°C Lead Temperature Soldering (10 sec) . . . . . . 300°C These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability. Electrical Characteristics Unless otherwise noted, specifications are over the operating temperature range and VCC supply voltages are 2.7V to 5.5V (IMP706P IMP706P, IMP708R IMP708R), 3.0V to 5.5V (IMP706/8S IMP706/8S), 3.15V to 5.5V (IMP706/8T IMP706/8T) and 4.1V to 5.5V (IMP706/8J IMP706/8J). Parameter Symbol Conditions Min 1.1 1.2 Typ Max Units 5.5 5.5 V µA Operating Voltage Range VCC IMP706xC, IMP708xC IMP706xE, IMP708xE Supply Current VCC < 3.6V ICC IMP706xC, IMP706xE, MR = VCC, WDI Floating 75 140 IMP708xC, IMP708xE, MR = VCC, WDI Floating 50 140 Supply Current VCC < 5.5V ICC IMP706xC, IMP706xE, MR = VCC, WDI Floating 75 140 RESET Threshold VRT P and R devices S devices T devices J devices IMP708xC, IMP708xE, MR = VCC, WDI Floating 50 2.55 2.85 3.00 3.89 RESET Threshold Hysteresis RESET Pulse Width tRS VCC = 3V (IMP706/8 IMP706/8, P/R devices), VCC = 3.3V (IMP706/8 IMP706/8, S/T devices) VCC = 4.4V (IMP706/8 IMP706/8, J devices) 140 tMR tMD 200 mV 280 4.5V < VCC < 5.5V 150 ns 3.6V < VCC < 4.5V (IMP706/8J IMP706/8J devices) VRST(MAX) < VCC < 3.6V (IMP706/8P/R/S/T IMP706/8P/R/S/T devices) 750 250 VIL VIH 4.5V < VCC < 5.5V VIL MR Pull-up Resistor VRST (MAX) < VCC < 4.5V VRST (MAX) < VCC < 4.5V 4.5V < VCC < 5.5V VIH 0.6 2.0 0.8 RP 10 20 40 VOH ISOURCE = 800µA, 4.5V < VCC < 5.5V VOL ISINK = 3.2mA, 4.5V < VCC < 5.5V ISOURCE = 500µA, VRST (MAX) < VCC < 4.5V VOL ISINK = 1.2mA, VRST (MAX) < VCC < 4.5V ISINK = 50µA, VCC = 1.1V (IMP706xC, IMP708xC devices) 0.3 ISINK = 100µA, VCC = 1.2V (IMP706xE, IMP708xE devices) k 0.3 VOL Daily Silver IMP ns V 0.7VCC VOH RESET Output Voltage (All R/S/T/J devices) ms 500 4.5V < VCC < 5.5V MR Input Threshold V 200 3.6V < VCC < 4.5V (IMP706/8J IMP706/8J devices) VRST (MAX) < VCC < 3.6V (IMP706/8P/R/S/T IMP706/8P/R/S/T devices) MR to RESET Out Delay 2.70 3.00 3.15 4.10 40 VCC = 5V MR Pulse Width 140 2.63 2.93 3.08 4.00 µA 0.3 www.ds-imp.com.cn VCC­1.5V V 0.4 0.8 VCC 3 IMP706P/R/S/T/J IMP706P/R/S/T/J, IMP708R/S/T/J IMP708R/S/T/J Electrical Characteristics (cont.) Unless otherwise noted, specifications are over the operating temperature range and VCC supply voltages are 2.7V to 5.5V (IMP706P IMP706P, IMP708R IMP708R), 3.0V to 5.5V (IMP706/8S IMP706/8S), 3.15V to 5.5V (IMP706/8T IMP706/8T) and 4.1V to 5.5V (IMP706/8J IMP706/8J). Parameter Symbol Conditions ISOURCE = 800µA, 4.5V < VCC < 5.5V VOL ISOURCE = 500µA, VRST (MAX) < VCC < 3.6V ISINK = 1.2mA, VRST (MAX) < VCC < 3.6V VOH ISOURCE = 800µA, 4.5V < VCC < 5.5V VOL ISINK = 3.2mA, 4.5V < VCC < 5.5V VOH ISOURCE = 500µA, VRST (MAX) < VCC < 4.5V ISINK = 1.2mA, VRST (MAX) < VCC < 4.5V Typ ISINK = 3.2mA, 4.5V < VCC < 5.5V VOL RESET Output Voltage, IMP708R/S/T/J IMP708R/S/T/J VOH VOH RESET Output Voltage IMP706P IMP706P Min VOL Ma x VCC­1.5V Units V 0.4 0.8VCC 0.3 VCC­1.5V V 0.4 0.8VCC 0.3 Watchdog Timeout Period tWD VCC = 3V (IMP706 IMP706, P/R devices) VCC = 3.3V (IMP706 IMP706, S/T devices) VCC = 4.4V (IMP706 IMP706, J devices) 1.0 WDI Pulse Width tWP VIL = 0.4V, VIH = 0.8VCC, VRST (MAX) < VCC < 4.5V 10 0 ns WDI Pulse Width tWP VIL = 0.4V, VIH = 0.8VCC, 4.5V < VCC < 5.5V 50 ns WDI Input Threshold VIH VCC = 5V 3.5 V 1.6 VIL VIH VRST (MAX) < VCC < 4.5V 0.7VCC VIL 0.6 WDI Input Current WDI = 0V, IMP706 IMP706 Only 50 WDI = VCC, IMP706 IMP706 Only VOH ISOURCE = 800µA, 4.5V < VCC < 5.5V VOL VOH ISOURCE = 500µA, VRST (MAX) < VCC < 4.5V VOL PFI falling. For P/R devices VCC = 3V. For S/T devices VCC = 3.3V. For J devices VCC = 4.4V. µA µA VCC­1.5V V 0.4 0.8VCC 0.3 VOH ISOURCE = 800µA, 4.5V < VCC < 5.5V ISOURCE = 500µA, VRS (MAX) < VCC < 4.5V ISINK = 1.2mA, VRS (MAX) < VCC < 4.5V 1.25 1.3 V 0.01 25 nA ISINK = 3.2mA, 4.5V < VCC < 5.5V VOH 1.2 ­25 VOL VOL 4 150 ­50 ISINK = 500µA, VRST (MAX) < VCC < 4.5V PFI Input Current PFO Output Voltage ­150 ISINK = 1.2mA, 4.5V < VCC < 5.5V PFI Input Threshold s 0.8 WDI Input Current WDO Output Voltage 2.25 www.ds-imp.com.cn VCC­1.5V V 0.4 0.8VCC 0.3 Daily Silver IMP IMP706P/R/S/T/J IMP706P/R/S/T/J, IMP708R/S/T/J IMP708R/S/T/J Pin Descriptions Pin Number IMP706P IMP706P IMP706R/S/T/J IMP706R/S/T/J IMP708R/S/T/J IMP708R/S/T/J DIP/SO MicroSO DIP/SO MicroSO DIP/SO MicroSO Name 1 3 1 3 1 3 MR 2 3 4 5 2 3 4 5 2 3 4 5 VCC GND 4 6 4 6 4 6 PFI 5 7 5 7 5 7 PFO 6 8 6 8 - - WDI - - - - 6 8 NC - - 7 1 7 1 RESET 8 2 8 2 - - WDO 7 1 - - 8 2 RESET Function Manual reset input. The active LOW input triggers a reset pulse. It is pulled HIGH by a 20k pull-up resistor. It is compatible with TTL/CMOS signals when VCC = 5V. It can be shorted to ground through a mechanical switch. Leave floating or connect to VCC if the function is not used. Monitored power supply input. Ground Power-fail input voltage monitor. With PFI less than 1.25V, PFO goes LOW. Connect PFI to ground when not used. Power-fail output. The output is active LOW and sinks current when PFI is less than 1.25V. If not used, leave the pin unconnected. Watchdog input. WDI controls the internal watchdog timer. A HIGH or LOW signal for 1.6 sec at WDI allows the internal timer to run-out, setting WDO low. A rising or falling edge must occur at WDI within 1.6 seconds or WDO goes LOW. The watchdog function is disabled by floating WDI. The internal watchdog timer clears when: RESET is asserted; WDI is three-stated; or WDI sees a rising or falling edge. Not connected. Active-LOW reset output. Pulses LOW for 200ms when triggered, and stays LOW whenever VCC is below the reset threshold. RESET remains LOW for 200ms after VCC rises above the RESET threshold or MR goes from HIGH to LOW. A watchdog timeout will not trigger RESET unless WDO is connected to MR. Watchdog output. WDO goes LOW when the 1.6 second internal watchdog timer times-out and does not go HIGH until a transition occurs at WDI. In addition, when VCC falls below the reset threshold, WDO goes LOW. Unlike RESET, WDO does not have a minimum pulse width and as soon as VCC exceeds the reset threshold, WDO becomes HIGH with no delay. Active-HIGH reset output. RESET is the inverse of RESET. Feature Summary IMP706P IMP706P IMP706R IMP706R IMP706S IMP706S IMP706T IMP706T IMP706J IMP706J IMP708R IMP708R IMP708S IMP708S IMP708T IMP708T IMP708J IMP708J Power-fail detector I I I I I I I I I Brownout detection I I I I I I I I I Debounced manual RESET input I I I I I I I I I Power-up/down RESET I I I I I I I I I Watchdog timer I I I I I Active-HIGH RESET I Active-LOW RESET I I I I Active-LOW and HIGH RESETs I I I I RESET threshold 2.63V 2.63V 2.93V 3.08V 4.00V 2.63V 2.93V 3.08V 4.00V Daily Silver IMP www.ds-imp.com.cn 5 IMP706P/R/S/T/J IMP706P/R/S/T/J, IMP708R/S/T/J IMP708R/S/T/J Detail Descriptions RESET/RESET Operation The RESET/RESET signals are designed to start or return a µP/µC to a known state. With VCC above 1.2V, RESET and RESET are guaranteed to be asserted. During a power-up sequence, the reset outputs remain asserted until the supply rises above the threshold level. The resets are deasserted approximately 200ms after crossing the threshold. In a brownout situation where VCC falls below the threshold level, the reset outputs are asserted. If a brownout occurs during an already initiated reset period, the reset period will extend for an additional reset period of 200ms. The IMP708 IMP708 devices have dual reset outputs, one active LOW and one active HIGH. The IMP706P IMP706P has a single active HIGH reset and the IMP706/R/S/T/J IMP706/R/S/T/J devices have an active LOW reset output. IMP Part RESET Polarity Threshold Watchdog Timer IMP706P IMP706P HIGH 2.63V Yes IMP706R IMP706R LOW 2.63V Yes IMP706S IMP706S LOW 2.93V Yes IMP706T IMP706T LOW 3.08V Yes IMP706J IMP706J LOW 4.00V Both: HIGH & LOW 2.63V No IMP708S IMP708S Both: HIGH & LOW 2.93V No IMP708T IMP708T Both: HIGH & LOW 3.08V No IMP708J IMP708J Both: HIGH & LOW 4.00V By connecting the watchdog output (WDO) and MR, a watchdog timeout forces a RESET to be generated. Watchdog Timer A watchdog timer available on the IMP706P/R/S/T/J IMP706P/R/S/T/J monitors µP/µC activity. If activity is not detected within 1.6 seconds on the Watchdog Input (WDI), the internal timer puts the Watchdog Output (WDO) into a LOW state. WDO will remain LOW until activity is detected at WDI. The watchdog function is disabled, meaning it is cleared and not counting, if WDI is floated or connected to a three-stated circuit. The watchdog timer is also disabled if RESET is asserted. When RESET becomes inactive and the WDI input sees a high or low transition as short as 100ns (VCC = 2.7V)/50ns (VCC = 4.5V), the watchdog timer will begin a 1.6 second countdown. Additional transitions at WDI will reset the watchdog timer and initiate a new countdown sequence. WDO will also become LOW and remain so, whenever the supply voltage, VCC, falls below the device threshold level. WDO goes HIGH as soon as VCC transitions above the threshold. There is no minimum pulse width for WDO as there is for the RESET outputs. If WDI is floated, WDO essentially acts as a low supply voltage output indicator. Yes IMP708R IMP708R width is 0.5µs with a 3V VCC input and 0.15µs with a 5V VCC input. If not used, tie MR to VCC or leave floating. No Power-failure detection with auxiliary comparator Manual Reset (MR) The active-LOW manual reset input is pulled high by an internal 20k pull-up resistor and can be driven low by CMOS/TTL logic or a mechanical switch to ground. An external debounce circuit is unnecessary since the 140ms minimum reset time will debounce mechanical pushbutton switches. The minimum MR input pulse All devices have an auxiliary comparator with 1.25V trip point. The output, PFO, is active LOW and the noninverting input is PFI. This comparator can be used as a supply voltage monitor with an external resistor voltage divider. As the monitored voltage level falls, PFI is reduced causing the PFO output to go LOW. Normally PFO interrupts the processor so the system can be shut down in a controlled manner. 5V VCC 0V vRT tRS tRS 5V 5V RESET WDI 0V 0V tWD tWD tWP 5V 5V MR WDO 0V 0V 0V tMD tWD tMR 5V 5V RESET MR externally set low WDO 0V RESET triggered by MR 706P_04.eps Watchdog Timing 6 706P_05.eps WDI Three-state operation www.ds-imp.com.cn Daily Silver IMP IMP706P/R/S/T/J IMP706P/R/S/T/J, IMP708R/S/T/J IMP708R/S/T/J Application Information Bi-directional Reset Pin Interfacing Ensuring That RESET is Valid Down to VCC = 0V The IMP706/8 IMP706/8 can interface with µP/µC bi-directional reset pins by connecting a 4.7k resistor in series with the RESET output and the µP/µC bi-directional reset pin. When VCC falls below 1.2V, the IMP706R/S/T/J IMP706R/S/T/J and IMP708R/S/T/J IMP708R/S/T/J RESET reset outputs no longer pull down; it becomes indeterminate. To avoid the possibility that stray charges could build up and force RESET to the wrong state, a pull-down resistor should be connected to the RESET pin, thus draining such charges to ground. The resistor value is not critical. A 100k resistor will pull RESET to ground without loading it. BUF Buffered RESET Monitoring Voltages Other Than VCC The IMP706/708 IMP706/708 can monitor voltages other than VCC using the Power Fail circuitry. If a resistive divider is connected from the voltage to be monitored to the PFI input, the PFO (output) will go LOW if the divider voltage goes below its 1.25V reference. Should hysteresis be desired, connect a resistor (equal to approximately 10 times the sum of the two resistors in the divider) between the PFI and PFO pins. A capacitor between PFI and GND will reduce circuit sensitivity to input high frequency noise. If it is desired to assert a reset in addition to the PFO flag, this may be achieved by connecting the PFO output to MR. VCC Supply Voltage IMP70x mC or mP 4.7kW RESET Input RESET GND GND Bi-directional I/O Pin (Example: 68HC11 68HC11) 706P_06.eps Package Dimensions MicroSO (8-Pin) Inches Min a Millimeters Max Min Max MicroSO (8-Pin)* * JEDEC Drawing MO-187AA MO-187AA Daily Silver IMP ­­­­ 1.10 0.050 0.15 0.75 0.95 0.25 0.40 0.13 0.23 2.90 3.10 0.65 BSC 4.90 BSC 2.90 3.10 0.40 0.70 0° 6° E1 E + ­­­­­ 0.0433 0.0020 0.0059 0.0295 0.0374 0.0098 0.0157 0.0051 0.0091 0.1142 0.1220 0.0256 BSC 0.193 BSC 0.1142 0.1220 0.0157 0.0276 0° 6° L D C A2 A 706P_t02a.at3 D A A1 A2 b C D e E E1 L a e b www.ds-imp.com.cn 0.10mm 0.004in MicroSO (8-Pin).eps A1 7 IMP706P/R/S/T/J IMP706P/R/S/T/J, IMP708R/S/T/J IMP708R/S/T/J Package Dimensions SO (8-Pin) 0°­ 8° Inches Millimeters Min Max Min Max 0.069 0.010 0.020 0.010 1.35 0.10 0.33 0.19 1.75 0.25 0.51 0.25 0.157 0.244 0.050 0.197 3.80 5.80 0.40 4.80 L SO (8-Pin)* A A1 B C e E H L D 0.053 0.004 0.013 0.007 1.27 0.050 0.150 0.228 0.016 0.189 H E 4.00 6.20 1.27 2.00 C D A Plastic DIP (8-Pin)* A A1 A2 b b2 b3 D D1 E E1 e eA eB eC L ­­­­­ 0.015 0.115 0.014 0.045 0.030 0.355 0.005 0.300 0.240 0.100 0.300 ­­­­­ ­­­­­ 0.115 0.210 ­­­­­ 0.195 0.022 0.070 0.045 0.400 ­­­­­ 0.325 0.280 ­­­­­ ­­­­­ 0.430 0.060 0.150 ­­­­ 0.38 2.92 0.36 1.14 0.80 9.02 0.13 7.62 6.10 5.33 ­­­­­ 4.95 0.56 1.78 1.14 10.16 ­­­­­ 8.26 7.11 e B A1 Plastic DIP (8-Pin) D1 E D 2.54 7.62 ­­­­­ 10.92 2.92 3.81 SO (8-Pin).eps E1 A A2 L A1 0°­15° 706P_t02b.at3 * JEDEC Drawing MS-112AA MS-112AA * JEDEC Drawing MS-001BA MS-001BA e C b2 b eA eB Plastic DIP (8-Pin)a.eps Daily Silver IMP Microelectronics Co.,Ltd 7 keda Road , Hi-Tech Park, NingBo,Zhejiang, P.R.C. Post Code : 315040 Tel:(086)-574-87906358 Fax:(086)-574-87908866 e-mail:sales@ds-imp.com.cn Website:www.ds-imp.com.cn The IMP logo is a registered trademark of Daily Silver IMP. All other company and product names are trademarks of their respective owners. 2005 Daily Silver IMP Revision : A Issue Date: 08/08/05 Type: Product