View 9WDV3501_4648199.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

Advance Information
DATASHEET
VOLTAGE MONITOR/WATCHDOG TIMER CIRCUIT
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. 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.
ICS9WDV3501B
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. 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 30K. 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:
* * * * * 5 Precision Voltage Monitors: Watchdog Timer Selectable Watchdog and Reset Timing Two Active Low reset outputs Precision Timebase with external trim resistor
VMON1 + -
VMON2 + -
VMON3 + -
VMON4 + RST0_DLY(1:0)
1.00V Bandgap Reset Timer 0 50 to 300 ms nominal Logic RESET0#
WTB(1:0)
WatchDog Timer
WDI
Watchdog Edge Detector
Reset Timer 1 50 to 300 ms nominal
RESET1#
RST1_DLY(1:0)
Master clock RP Osc
IDTTM/ICSTM Voltage Monitor/Watchdog Timer Circuit
1468--05/30/08
1
ICS9WDV3501B Voltage Monitor/Watchdog Timer Circuit
Advance Information Advance Information
MLF Pin Configuration
VMON0 VMON1 VMON2 VMON3 VMON4 15 14 13 12 11 GNDA RST1_SEL1 RST1_SEL0 RST0_SEL1 RST0_SEL0
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
1568--05/30/08
20 VDDA WTB1 WTB0 WDI RP 1 2 3 4 5 6 GND
19
18 17 16
9WDV3501
7 *WDI_EN 8 RESET1# 9 10 RESET0# VDD
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
IDTTM/ICSTM Voltage Monitor/Watchdog Timer Circuit
2
ICS9WDV3501B Voltage Monitor/Watchdog Timer Circuit
Advance Information Advance Information
TSSOP Pin Configuration
VMON1 VMON0 VDDA WTB1 WTB0 WDI RP GND *WDI_EN RESET1#
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
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 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
PWR
IN PWR IN IN IN IN GND IN OUT OUT PWR IN IN IN IN GND IN IN IN
IDTTM/ICSTM Voltage Monitor/Watchdog Timer Circuit
9WDV3501
1568--05/30/08
3
ICS9WDV3501B Voltage Monitor/Watchdog Timer Circuit
Advance Information Advance Information
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 Voltage Monitor/Watchdog Timer Circuit
Advance Information Advance Information
VDD 9WDV3501
Vmon Inputs
Reset 0#
Delay set by RST0_DLY0,1
Reset 1#
Fig 1. Power on Timing
Vmon Inputs
Reset 0#
Delay set by RST0_DLY0,1
Reset 1#
Fig. 2. Vmon Reset Event Timing
Pulses ignored during Reset
WDI
Reset 0#
Reset period set by RST0_DLY0,1
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 Voltage Monitor/Watchdog Timer Circuit
Advance Information Advance Information
Absolute Maximum Ratings
(@ 25C 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 Digital Output Human Body Model -65 2000 MIN -0.3 TYP MAX UNITS Notes 4.6 V VDD + 0.3 V 200 mA 200 mA 500 150 mW
C V
Electrical Characteristics - Input/Supply/Common Output Parameters
PARAMETER Ambient Operating Temp Operating Voltage Operating Supply Current Input High Voltage Input Low Voltage Input Leakage Current SYMBOL TambientC TambientI VDD I DD_3.3V V IHSE VILSE I IN CONDITIONS Standard Part Industrial Temp Version Supply Voltage Iout = 1mA All inputs except VMON All inputs except VMON VIN = VDD , V IN = GND MIN 0 -45 2.97 2 GND - 0.3 -5 TYP MAX UNITS Notes 70 C 85 C 3.63 V 2500 A VDD + 0.3 V 1 0.8 5 V A 1
3.30
Electrical Characteristics - Reset, WDI and Watchdog Timer Parameters
PARAMETER VMON Input Threshold VMON Input Hysteresis SYMBOL VVMON VVMONHYST t RESET0, t RESET1 CONDITIONS VMON input VMON input MIN 0.96 40 80 160 240 0.80 1.60 4.00 8.00 100 2,4 -5 0.8 TYP 1.00 50 50 100 200 300 1.00 2.00 5.00 10.00 MAX 1.04 60 120 240 360 1.20 2.40 6.00 12.00 UNITS Notes V mV ms ms ms ms ms ms ms ms ns V V 8A MHz 3 3 3 3 3 3 3 3 3
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 -40C to +80C
0.7 1 5 1.2
IDTTM/ICSTM Voltage Monitor/Watchdog Timer Circuit
1568--05/30/08
6
ICS9WDV3501B Voltage Monitor/Watchdog Timer Circuit
Advance Information Advance Information
N
c
L
E1 INDEX AREA
E
12
D
A2 A1
A
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 VARIATIONS
-Ce
b SEA TING PLANE
N 20
D mm. MIN 6.40 MAX 6.60 MIN .252
D (inch) MAX .260
aaa C
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 Voltage Monitor/Watchdog Timer Circuit
Advance Information Advance Information
Seating Plane Index Area N Anvil Singulation A1 A3 L
(Ref.)
(N D -1)x e
(Ref.)
ND & N Even N
1
(T yp.) e 2 If N & N D
are Even (N -1)x e
2 E2
E2 2
(Ref.)
OR
Top V iew Sawn Singulation
b A
(Re f.)
e D2 2 D2
D
ND & N Odd C
Thermal Base
Chamfer 4x 0.6 x 0.6 max OPTIONAL
0. 08
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 Voltage Monitor/Watchdog Timer Circuit
Advance Information Advance Information
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
For Sales
800-345-7015 408-284-8200 Fax: 408-284-2775
For Tech Support
408-284-6578 pcclockhelp@idt.com
Corporate Headquarters
Integrated Device Technology, Inc. 6024 Silver Creek Valley Road San Jose, CA 95138 United States 800 345 7015 +408 284 8200 (outside U.S.)
Asia Pacific and Japan
Integrated Device Technology Singapore (1997) Pte. Ltd. Reg. No. 199707558G 435 Orchard Road #20-03 Wisma Atria Singapore 238877 +65 6 887 5505
Europe
IDT Europe, Limited Prime House Barnett Wood Lane Leatherhead, Surrey United Kingdom KT22 7DE +44 1372 363 339
TM
(c) 2006 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT and the IDT logo are trademarks of Integrated Device Technology, Inc. Accelerated Thinking is a service mark of Integrated Device Technology, Inc. All other brands, product names and marks are or may be trademarks or registered trademarks used to identify products or services of their respective owners. Printed in USA
9

▲Up To Search▲

Price & Availability of 9WDV3501

	To Download 9WDV3501 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .