CBM705

CBM705 COREBAI | Alldatasheet

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Technical content

www.corebai.com CBM705/CBM706/CBM707/CBM708 OPERATION INSTRUCTION

FEATURES

 Guaranteed RESET valid with V CC = 1V  190 μA quiescent current  Precision supply voltage monitor

4.65 V (CBM705/CBM707)

4.40 V (CBM706/CBM708)

 200 ms reset pulse width  Debounced TTL/CMOS manual reset input (MR)  Independent watchdog timer (CBM705/CBM706)  1.60 sec timeout (CBM705/CBM706)  Active high reset output (CBM707/CBM708)  Voltage monitor for power fail or low battery warning  Superior upgrade for ADM705 to ADM708

APPLICATIONS

 Microprocessor systems  Computers  Controllers  Intelligent instruments  Critical microprocessor supply monitoring GENERAL DESCRIPTION The CBM705, CBM706, CBM707, CBM708 microprocessor supervisory circuits are suitable for monitoring 5V power supplies/batteries and microprocessor activity. The CBM705/ CBM706 provide power-supply monitoring circuitry that generate a reset output during power-up, power-down, and brownout conditions. The reset output remains operational with V CC as low as 1V. Independent watchdog monitoring circuitry is also provided. This is activated if the watchdog input has not been toggled within 1.60 sec. In addition, there is a 1.25V threshold detector to warn of power failures, to detect low battery conditions, or to monitor an additional power supply. An active low, debounced manual reset input ( MR ) is also included. The CBM705 and CBM706 are identical except for the reset threshold monitor levels, which are 4.65V and 4.40V, respectively. The CBM707 and CBM708 provide a similar functionality to the CBM705 and CBM706 and only differ in that a watchdog timer function is not available. Instead, an active high reset output (RESET) is available as well as the active low reset output ( RESET ). The CBM707 and CBM708 are identical except for the reset threshold monitor levels, which are 4.65V and 4.40V, respectively. All devices are available in narrow 8-lead SOIC packages. A ll data sheet.com

www.corebai.com CBM705/CBM706/CBM707/CBM708 OPERATION INSTRUCTION SPECIFICATIONS VCC = 4.75 V to 5.5 V, T A = TMIN to TMAX, unless otherwise noted. Table 1. Parameter Min Typ Max Unit Test Conditions/Comments POWER SUPPLY VCC Operating Voltage Range 1.0 5.5 V Supply Current 190 250 μA LOGIC OUTPUT Reset Threshold 4.5 4.65 4.75 V CBM705/CBM707 4.25 4.40 4.50 V CBM706/CBM708 Reset Threshold Hysteresis 40 mV RESET PULSE WIDTH 160 200 280 ms RESET OUTPUT VOLTAGE VCC-1.5 V ISOURCE = 800 µA 0.4 V ISINK = 3.2 mA

0.3 V VCC = 1 V, I SINK = 50 µA

0.3 V VCC = 1.2 V, I SINK = 100 µA RESET OUTPUT VOLTAGE VCC−1.5 V CBM707/CBM708, ISOURCE = 800 µA 0.4 V CBM707/CBM708, ISINK = 1.2 mA WDI Pulse Width (t WP) 50 ns WATCHDOG INPUT WDI Input Threshold Logic Low 0.8 V Logic High 3.5 V WDI Input Current 50 150 µA WDI=0V -150 -50 µA WDI=0V WDO OUTPUT VOLTAGE VCC-1.5 V ISOURCE = 800µA 0.4 V ISINK = 1.2mA MANUAL RESET INPUT MR Pull-Up Current 100 250 600 µA MR = 0V MR Pulse Width 150 ns MR INPUT THRESHOLD Logic Low 0.8 V Logic High 2.0 V MR TO RESET OUTPUT DELAY 250 ns POWER FAIL INPUT PFI Input Threshold 1.2 1.25 1.3 V PFI Input Current -25 +0.01 +25 nA PFO OUTPUT VOLTAGE VCC-1.5 V ISOURCE = 800 µA 0.4 V ISINK = 3.2 mA A ll data sheet.com

www.corebai.com CBM705/CBM706/CBM707/CBM708 OPERATION INSTRUCTION ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted. Table 2. Parameter Rating VCC −0.3 V to +6 V All Other Inputs −0.3V to VCC+0.3V Input Current VCC 20mA GND 20mA Digital Output Current 20mA Power Dissipation, N-8 PDIP 727mW θJA Thermal Impedance 135℃ Power Dissipation, R-8 SOIC 470mW θJA Thermal Impedance 110℃/W Power Dissipation, RM-8 MSOP 900mW θJA Thermal Impedance 206℃/W Operating Temperature Range Industrial (Version A) -40℃ to +85℃ Lead Temperature (Soldering, 10 sec) 300℃ Vapor Phase (60 sec) 215℃ Infrared (15 sec) 220℃ Storage Temperature Range -65℃ to +150℃ ESD Rating >4.5kV Stresses at or above those listed under Absolute Maximum Ratings may cause permanent damage to the product. This is a stress rating only; functional operation of the product at these or any other conditions above those indicated in the operational section of this specification is not implied. Operation beyond the maximum operating conditions for extended periods may affect product reliability. A ll data sheet.com

www.corebai.com CBM705/CBM706/CBM707/CBM708 OPERATION INSTRUCTION Pin Function Descriptions Mnemonic Pin Number DescriptionCBM705 CBM706 CBM707 CBM708 CBM708 MR 1 1 3 Manual Reset Input. When this pin is taken below 0.8V, a reset is generated. MR can be driven from TTL, CMOS logic, or from a manual reset switch as it is internally debounced. An internal 250μA pull-up current holds the input high when floating. VCC 2 2 4 5V Power Supply Input. Place a 0.1μF decoupling capacitor between the VCC and GND pins. GND 3 3 5 0V Ground Reference for All Signals. PFI 4 4 6 Power Fail Input. PFI is the noninverting input to the power fail comparator. When PFI is less than 1.25V, PFO goes low. If unused, PFI must be connected to GND. PFO 5 5 7 Power Fail Output. PFO is the output from the power fail comparator. It goes low when PFI is less than 1.25V. WDI 6 Not applicable Not applicable Watchdog Input. WDI is a three-level input. If WDI remains either high or low for longer than the watchdog timeout period, the watchdog output (WDO ) goes low. The timer resets with each transition at the WDI input. Either a high to low or a low to high transition clears the counter. The internal timer is also cleared whenever reset is asserted. The watchdog timer is disabled when WDI is left floating or connected to a three-state buffer. NC Not applicable 6 8 No Connect. RESET 7 7 1 Logic Output. RESET goes low for 200ms when triggered. It can be triggered either by V CC being below the reset threshold or by a low signal on the manual reset input ( MR ). RESET remains low whenever V CC is below the reset threshold (4.65V in CBM705/CBM707, 4.40 V in CBM706/CBM708). It remains low for 200ms after V CC goes above the reset threshold or MR goes from low to high. A watchdog timeout does not trigger RESET unless WDO is connected to MR WDO 8 Not applicable Not applicable Watchdog Output. WDO remains low until the watchdog timer is cleared. WDO also goes low during low line conditions. Whenever V CC is below the reset threshold, WDO goes low if the internal WDO remains low. As soon as V CC goes above the reset threshold, WDO goes high. RESET Not applicable 8 2 Logic Output. RESET is an active high output suitable for systems that use active high reset logic. It is the inverse of RESET . A ll data sheet.com

In addition to RESET , an active high RESET output is also available on the CBM707/CBM708. Figure 13. RESET, MR, and WDO Timing

service routine then rectifies the problem. as a low line output because it goes low only when V CC falls below the reset threshold. Figure 14. Watchdog Timing

pin voltage during device power up and operation. Figure 15. Power Fail Comparator

For increased noise immunity, hysteresis can be added to the power fail comparator. between the PFO output and the PFI input as shown in Figure 16. Figure 16. Adding Hysteresis to the Power Fail Comparator

pull-down resistor can connect externally, as shown in Figure 17, to hold the line low if required. Figure 17. RESET Valid Below 1V

www.corebai.com CBM705/CBM706/CBM707/CBM708 OPERATION INSTRUCTION OUTLINE DIMENSIONS SOIC-8(SOP8) Symbol Dimensions In Millimeters Dimensions Inches Min Max Min Max A 1.350 1.750 0.053 0.069 A1 0.100 0.250 0.004 0.010 A2 1.350 1.550 0.053 0.061 b 0.330 0.510 0.013 0.020 c 0.170 0.250 0.007 0.010 D 4.800 5.000 0.189 0.197 E 5.800 6.200 0.228 0.244 E1 3.800 4.000 0.150 0.157 e 1.270 BSC 0.050 BSC L 0.400 1.270 0.016 0.050 θ 0° 8° 0° 8° A ll data sheet.com

www.corebai.com CBM705/CBM706/CBM707/CBM708 OPERATION INSTRUCTION MSOP-8 Symbol Dimensions In Millimeters Dimensions Inches Min Max Min Max A 0.820 1.100 0.032 0.043 A1 0.020 0.150 0.001 0.006 A2 0.750 0.950 0.030 0.037 b 0.250 0.380 0.010 0.015 c 0.090 0.230 0.004 0.009 D 2.900 3.100 0.114 0.122 E 2.900 3.100 0.114 0.122 E1 4.750 5.050 0.187 0.199 e 0.650 BSC 0.026 BSC L 0.400 0.800 0.016 0.031 θ 0° 6° 0° 6° A ll data sheet.com

www.corebai.com CBM705/CBM706/CBM707/CBM708 OPERATION INSTRUCTION PACKAGE/ORDERING INFORMATION PRODUCT ORDERING NUMBER TEMPRANGE PACKAGE PAKEAGE MARKING TRANSPOT MEDIA,QUANTILY CBM705 CBM705AS8 -40℃~125℃ SOIC-8(SOP8) CBM705A Tape and Reel,2500 CBM705AMS8 -40℃~125℃ MSOP-8 705AM Tape and Reel,3000 CBM706 CBM706AS8 -40℃~125℃ SOIC-8(SOP8) CBM706A Tape and Reel,2500 CBM706AMS8 -40℃~125℃ MSOP-8 706AM Tape and Reel,3000 CBM707 CBM707AS8 -40℃~125℃ SOIC-8(SOP8) CBM707A Tape and Reel,2500 CBM707AMS8 -40℃~125℃ MSOP-8 707AM Tape and Reel,3000 CBM708 CBM708AS8 -40℃~125℃ SOIC-8(SOP8) CBM708A Tape and Reel,2500 CBM708AMS8 -40℃~125℃ MSOP-8 708AM Tape and Reel,3000 A ll data sheet.com