Advance Information DATASHEET VOLTAGE MONITOR/WATCHDOG TIMER CIRCUIT ICS9WDV3501B General Description: The 9WDV3501 contains 5 voltage monitoring (VMON) comparators and a watchdog timer circuit. The external voltage monitor inputs have a reset threshold of approximately 1.0V. Various power supplies can easily be monitored with these inputs by use of a simple resistor ladder to divide the supply rail down to 1.0V. The RESET1# count down period is set by the RST1_DLY(1:0) inputs. The additional delay can range from 50ms to 300ms. This additional reset is designed to hold the peripheral circuits in reset after the microprocessor has been released from reset. The VMON circuitry can continue to operate until VDD drops below 2.3V. There are two RESET# outputs. RESET0# is typically connected to a microprocessor, while RESET1# is typically connected to peripheral components. If any of the VMON inputs drops outside the desired operating range, both RESET# outputs will be asserted simultaneously. They will stay low as long as VMON is below the threshold. After VMON rises above the threshold, RESET0# will begin its timeout count down and return high after the count down expires. The count down period depends on the value on the RST0_DLY(1:0) pins. The minimum value is 50ms and the maximum value is 300ms. When RESET0# is de-asserted, the RESET1# output will continue to be asserted for an additional count down period. The watchdog timer monitors transitions on the WDI input. This input is usually driven by a GPIO line from a microprocessor and is used to detect when the CPU has entered an infinite loop. If a transition on the WDI input is not detected within the watchdog time out period, both RESET# outputs will be asserted and will be as described in the previous paragraph. The watchdog timer is restarted when RESET1# goes inactive. The watchdog time out period is selectable using the WTB(1:0) inputs. The watchdog can be disabled by pulling the WDI_EN pin low. The 9WDV3501 incorporates a precision RC oscillator that utilized an external trimming resistor for maximum accuracy. The recommend value for this resistor is 30KΩ. The 9WDV3501 is available in both commercial and industrial temperature ranges. It is available in a 20-pin QFN or a 20-pin TSSOP package. Functional Block Diagram VMON0 + Features: - • • • • • VMON1 + - VMON2 + - 5 Precision Voltage Monitors: Watchdog Timer Selectable Watchdog and Reset Timing Two Active Low reset outputs Precision Timebase with external trim resistor VMON3 + - VMON4 + RST0_DLY(1:0) 1.00V Bandgap WDI Reset Timer 0 50 to 300 ms nominal WatchDog Timer RESET0# Logic WTB(1:0) Reset Timer 1 50 to 300 ms nominal Watchdog Edge Detector RESET1# RST1_DLY(1:0) Master clock RP Osc IDTTM/ICSTM Voltage Monitor/Watchdog Timer Circuit 1468—05/30/08 1 ICS9WDV3501B Advance Information Advance Information Voltage Monitor/Watchdog Timer Circuit VMON4 VMON2 19 18 17 16 1 2 3 4 5 VMON3 VMON1 20 7 8 9 10 RESET1# RESET0# 15 14 13 12 11 GNDA RST1_SEL1 RST1_SEL0 RST0_SEL1 RST0_SEL0 VDD 6 *WDI_EN 9WDV3501 GND VDDA WTB1 WTB0 WDI RP VMON0 MLF Pin Configuration 20-pin MLF pins preceded by '*' have 100kohm internal pull up. MLF Pin Description PIN # (MLF) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 PIN NAME VDDA WTB1 WTB0 WDI RP GND *WDI_EN RESET1# RESET0# VDD RST0_SEL0 RST0_SEL1 RST1_SEL0 RST1_SEL1 GNDA VMON4 VMON3 VMON2 VMON1 VMON0 PIN TYPE PWR IN IN IN IN GND IN OUT OUT PWR IN IN IN IN GND IN IN IN IN IN DESCRIPTION 3.3V Analog Power Supply Watchdog timout select bit. (MSB) Watchdog timout select bit. (LSB) Watchdog Input Resistor connection for internal oscillator Ground pin This input enables or disables the watchdog timer. 0 = Disable, 1 = Enable RESET 1 output. Low = Reset, High = Normal Operation RESET 0 output. Low = Reset, High = Normal Operation 3.3V Power Supply RESET1 timeout period select (LSB) RESET1 timeout period select (MSB) RESET1 timeout period select (LSB) RESET1 timeout period select (MSB) Analog Ground Voltage Monitor Input, nominal 1.0V threshold Voltage Monitor Input, nominal 1.0V threshold Voltage Monitor Input, nominal 1.0V threshold Voltage Monitor Input, nominal 1.0V threshold Voltage Monitor Input, nominal 1.0V threshold IDTTM/ICSTM Voltage Monitor/Watchdog Timer Circuit 1568—05/30/08 2 ICS9WDV3501B Advance Information Advance Information Voltage Monitor/Watchdog Timer Circuit TSSOP Pin Configuration 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 9WDV3501 VMON1 VMON0 VDDA WTB1 WTB0 WDI RP GND *WDI_EN RESET1# VMON2 VMON3 VMON4 GNDA RST1_SEL1 RST1_SEL0 RST0_SEL1 RST0_SEL0 VDD RESET0# 20-pin TSSOP pins preceded by '*' have 100kohm internal pull up. TSSOP Pin Description PIN # (TSSOP) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 PIN NAME VMON1 VMON0 VDDA WTB1 WTB0 WDI RP GND *WDI_EN RESET1# RESET0# VDD RST0_SEL0 RST0_SEL1 RST1_SEL0 RST1_SEL1 GNDA VMON4 VMON3 VMON2 PIN TYPE PWR IN PWR IN IN IN IN GND IN OUT OUT PWR IN IN IN IN GND IN IN IN DESCRIPTION Voltage Monitor Input, nominal 1.0V threshold Voltage Monitor Input, nominal 1.0V threshold 3.3V Analog Power Supply Watchdog timout select bit. (MSB) Watchdog timout select bit. (LSB) Watchdog Input Resistor connection for internal oscillator Ground pin This input enables or disables the watchdog timer. 0 = Disable, 1 = Enable RESET 1 output. Low = Reset, High = Normal Operation RESET 0 output. Low = Reset, High = Normal Operation 3.3V Power Supply RESET1 timeout period select (LSB) RESET1 timeout period select (MSB) RESET1 timeout period select (LSB) RESET1 timeout period select (MSB) Analog Ground Voltage Monitor Input, nominal 1.0V threshold Voltage Monitor Input, nominal 1.0V threshold Voltage Monitor Input, nominal 1.0V threshold IDTTM/ICSTM Voltage Monitor/Watchdog Timer Circuit 1568—05/30/08 3 ICS9WDV3501B Advance Information Advance Information Voltage Monitor/Watchdog Timer Circuit Selectable WatchDog TimeOut data latched at power on WTB1 WTB0 Period (ms) 0 0 1.00 0 1 2.00 1 0 5.00 1 1 10.00 Selectable Reset 0 Assertion Period data latched at power on Assertion RST0_DLY1 RST0_DLY0 (ms) 0 0 50 0 1 100 1 0 200 1 1 300 Selectable Reset 1 Assertion Period (Period AFTER Reset0 De-Asserts) data latched at power on Assertion RST1_DLY1 RST1_DLY0 (ms) 0 0 50 0 1 100 1 0 200 1 1 300 IDTTM/ICSTM Voltage Monitor/Watchdog Timer Circuit 1568—05/30/08 4 ICS9WDV3501B Advance Information Advance Information Voltage Monitor/Watchdog Timer Circuit VDD 9WDV3501 Vmon Inputs Delay set by RST0_DLY0,1 Reset 0# Reset 1# Fig 1. Power on Timing Vmon Inputs Delay set by RST0_DLY0,1 Reset 0# Reset 1# Fig. 2. Vmon Reset Event Timing Pulses ignored during Reset WDI Reset period set by RST0_DLY0,1 Reset 0# Reset 1# Reset period set by RST1_DLY0,1 Fig. 3. Watch Dog Timer Reset Event Timing IDTTM/ICSTM Voltage Monitor/Watchdog Timer Circuit 1568—05/30/08 5 ICS9WDV3501B Advance Information Advance Information Voltage Monitor/Watchdog Timer Circuit Absolute Maximum Ratings (@ 25°C unless otherwise indicated) PARAMETER SYMBOL VDD Maximum Supply Voltage Maximum Input Voltage VMON Maximum Input Current IIMAX Maximum Output Current I OMAX Maximum Power PDMAX Dissipation Current Storage Temperature Ts ESD protection ESD prot CONDITIONS Supply Voltage 3.3V LVCMOS Inputs VDD or GND Digital Output MIN TYP -0.3 Digital Output Human Body Model MAX UNITS Notes 4.6 V VDD + 0.3 V 200 mA 200 mA 500 -65 2000 150 mW ° C V Electrical Characteristics - Input/Supply/Common Output Parameters PARAMETER SYMBOL TambientC TambientI VDD I DD_3.3V V IHSE CONDITIONS Standard Part Industrial Temp Version Supply Voltage Iout = 1mA All inputs except VMON MIN 0 -45 2.97 Input Low Voltage VILSE All inputs except VMON GND - 0.3 0.8 V Input Leakage Current I IN VIN = VDD , V IN = GND -5 5 ΠA Ambient Operating Temp Operating Voltage Operating Supply Current Input High Voltage TYP 3.30 2 MAX UNITS Notes 70 °C 85 °C 3.63 V ΠA 2500 VDD + 0.3 V 1 1 Electrical Characteristics - Reset, WDI and Watchdog Timer Parameters PARAMETER VMON Input Threshold VMON Input Hysteresis SYMBOL VVMON VVMONHYST CONDITIONS VMON input VMON input RST0_DLY(1:0) = 00 Reset 0 & Reset 1 RST0_DLY(1:0) = 01 Timeout Delay RST0_DLY(1:0) = 10 RST1_DLY(1:0) = 11 WTB(1:0) = 00 WTB(1:0) = 01 Watchdog Timeout WDTOUT WTB(1:0) = 10 WTB(1:0) = 11 WDI Input Pulse Width WDI PW VIL= 0.4V, VIH = 2.8V RESET outputs, Iout = 1mA Output High Voltage V OH RESET outputs, Iout = Output Low Voltage VOL 16mA VIN = VDD , V IN = GND Input Leakage Current I IN VDD = 3.3 V, Rp = 30k8 TimeBase Frequency Fosc 1. WDI pulse width limited to 150ns with these input thresholds 2. VMON Falling 3. Values over the entire industrial temp range -40°C to +80°C t RESET0, t RESET1 IDTTM/ICSTM Voltage Monitor/Watchdog Timer Circuit MIN 0.96 TYP 1.00 50 MAX 1.04 40 80 160 240 0.80 1.60 4.00 8.00 100 2,4 50 100 200 300 1.00 2.00 5.00 10.00 60 120 240 360 1.20 2.40 6.00 12.00 ms ms ms ms ms ms ms ms ns V 0.7 V 5 1.2 8A MHz -5 0.8 1 UNITS Notes V mV 3 3 3 3 3 3 3 3 3 1568—05/30/08 6 ICS9WDV3501B Advance Information Advance Information Voltage Monitor/Watchdog Timer Circuit 20-Lead, 4.40 mm. Body, 0.65 mm. Pitch TSSOP (173 mil) (25.6 mil) In Millimeters In Inches SYMBOL COMMON DIMENSIONS COMMON DIMENSIONS MIN MAX MIN MAX A -1.20 -.047 A1 0.05 0.15 .002 .006 A2 0.80 1.05 .032 .041 b 0.19 0.30 .007 .012 c 0.09 0.20 .0035 .008 D SEE VARIATIONS SEE VARIATIONS E 6.40 BASIC 0.252 BASIC E1 4.30 4.50 .169 .177 e 0.65 BASIC 0.0256 BASIC L 0.45 0.75 .018 .030 N SEE VARIATIONS SEE VARIATIONS a 0° 8° 0° 8° aaa -0.10 -.004 c N L E1 E INDEX AREA 1 2 α D A A2 VARIATIONS A1 -Ce N SEATING PLANE b 20 aaa C D mm. MIN 6.40 D (inch) MAX 6.60 MIN .252 MAX .260 Reference Doc.: JEDEC Publication 95, MO-153 10-0035 Ordering Information 9WDV3501BGLFT Example: XXXX B G LF T Designation for tape and reel packaging Lead Free, RoHS Compliant Package Type G = TSSOP Revision Designator (will not correlate with datasheet revision) Device Type IDTTM/ICSTM Voltage Monitor/Watchdog Timer Circuit 1568—05/30/08 7 ICS9WDV3501B Advance Information Advance Information Voltage Monitor/Watchdog Timer Circuit (Ref.) Seating Plane (N D -1)x e (Ref.) A1 Index Area ND & N Even A3 N L N 1 Anvil Singulation E2 (Ref.) b (Re f.) A Chamfer 4x 0.6 x 0.6 max OPTIONAL (N -1)x e E2 2 Sawn Singulation D are Even 2 OR Top V iew (T yp.) e 2 If N & N D e D2 2 ND & N Odd Thermal Base D2 0. 08 C C THERMALLY ENHANCED, VERY THIN, FINE PITCH QUAD FLAT / NO LEAD PLASTIC PACKAGE DIMENSIONS SYMBOL A A1 A3 b e DIMENSIONS MIN. MAX. 0.8 1.0 0 0.05 0.20 Reference 0.18 0.3 0.50 BASIC SYMBOL N ND NE D x E BASIC D2 MIN. / MAX. E2 MIN. / MAX. L MIN. / MAX. ICS 20L TOLERANCE 20 5 5 4.00 x 4.00 2.00 / 2.25 2.00 / 2.25 0.45 / 0.65 Ordering Information 9WDV3501BKLFT Example: XXXX B K LF T Designation for tape and reel packaging Lead Free, RoHS Compliant Package Type K = MLF Revision Designator (will not correlate with datasheet revision) Device Type IDTTM/ICSTM Voltage Monitor/Watchdog Timer Circuit 1568—05/30/08 8 ICS9WDV3501B Advance Information Advance Information Voltage Monitor/Watchdog Timer Circuit Revision History Rev. x.1 Issue Date Description 5/30/2008 Rev B to change times to match customer specs Page # - Innovate with IDT and accelerate your future networks. Contact: www.IDT.com TM For Sales For Tech Support 800-345-7015 408-284-8200 Fax: 408-284-2775 408-284-6578 [email protected] Corporate Headquarters Asia Pacific and Japan Europe Integrated Device Technology, Inc. 6024 Silver Creek Valley Road San Jose, CA 95138 United States 800 345 7015 +408 284 8200 (outside U.S.) Integrated Device Technology Singapore (1997) Pte. Ltd. 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