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Part: AME8510AEEVAFX26
Category:
Description: Threshold Voltage: 2.63V; Micropower up Watch Dog Timer
Company: Analog Micro
Datasheet: Download AME8510AEEVAFX26 datasheet File size : 108 kB
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AME, Inc.
AME8510 / 8520 / 8530
Micropower µP Watch Dog Timer
n General Description
The AME8510/8520/8530 family allows the user to customize the CPU monitoring function without any external components. The user has a large choice of reset voltage thresholds and output driver configurations, all of which are preset at the factory. Each wafer is trimmed to the customer's specifications. These circuits will ignore fast negative going transients on VDD. The state of the reset output is guaranteed to be correct down to 1V. After VDD crosses above a factory preset threshold, the AME8510/8520/8530 assert a reset signal. After a pred e t e r m i n e d time (the "reset" interval) the reset is deasserted. If VDD ever drops below the threshold voltage a reset is asserted immediately. In addition to a supply monitoring function the AME8510/8520 also monitor transitions at the watch dog (WDI) input. If a logic transition does not occur at the WDI pin within a certain time interval (the "watchdog" interval) then a reset is asserted. The reset deasserts after the reset interval, as explained earlier. The AME8510/8530 can both assert a reset manually by pulling the MRB input to ground.
n Features
l l l l l l l l
Small packages: SOT-23-5 7 voltage threshold options Tight voltage threshold tolerance --- ±1.50% 12 output driver configuration options Wide temperature range -------- -45oC to 85oC Low temperature coefficient --- 100ppm/oC (max) Low quiescent current < 3.0µA 3 bonding options
n Pin Configuration
SOT-25 Top View
VDD WDI
RESET/ RESETB
n Applications
l l l l l
VDD
WDI
AME8520
AME8530
RESET/ RESETB
GND
RESETB/ RESET
RESET/ RESETB
AME8530 AME851
AME8510 AME8511
Motherboards Computer peripherals Portable electronics Applications using CPUs Consumer electronics
AME8510 AME8511 AME8510
GND MRB VDD MRB GND RESETB/ RESET
Space saving SOT25 packages and micropower quiescent current make this family a natural for portable battery powered equipment.
1
AME, Inc.
AME8510 / 8520 / 8530
n Ordering Information
Micropower µP Watch Dog Timer
AME8510AEEV X X X XX AME8520AEEV X X X XX AME8530AEEV X X X XX
VDD Threshold Voltage
22: VTH=2.19V 23: VTH=2.32V 26: VTH=2.63V 29: VTH=2.93V 31: VTH=3.08V 44: VTH=4.38V 46: VTH=4.63V
Watch Dog Interval (TWDNOM)
E: X: TD=1760mS Without WDI option
Reset Time (TD2NOM)
F: TD=210mS
Output Driver Option
Pin 1 Polarity A: B: C: --For example-AME8520AEEVEFE29 means: Output at pin 1 is RESETB, push pull Output at pin 3 is RESET, push pull Reset time is 210mS Watch dog interval is 1760mS VDD threshold voltage is 2.93V No temperature shutdow n D: E: F: G: H: I: J: K: L: RESETB RESETB RESET RESET RESETB RESETB RESETB RESETB RESET RESET RESET RESET * PP OD PP OD PP PP OD OD PP PP OD OD Pin 3 N/A N/A N/A N/A RESET RESET RESET RESET RESETB RESETB RESETB RESETB N/A N/A N/A N/A PP OD PP OD PP OD PP OD Polarity *
V DD
WDI/MRB
PIN 1 G N D
* Output Driver Chart Explanation: PP = Push pull output OD = Open drain output N/A = Not available (8510) RESET = Active high RESETB = Active low
Please consult AME sales office or authorized Rep. for other RESET TIME interval and Watch Dog time interval.
2
AME8530 AME851
8510/20/30
PIN 3
AME, Inc.
AME8510 / 8520 / 8530
Micropower µP Watch Dog Timer
n Absolute Maximum Ratings
Parameter Supply Voltage ESD Classification Maximum 6 B Unit V
Caution: Stress above the listed absolute rating may cause permanent damage to the device
n Recommended Operating Conditions
Parameter Supply Voltage Ambient Temperature Range Junction Temperature Rating 0.9 - 5 V - 40 to +85 C - 40 to +125 C
o o
n Thermal Information
Parameter Thermal Resistance (SOT-25) Maximum Junction Temperature Maximum Lead Temperature ( 10 Sec) Maximum 256 150 300 Unit
o
C /W
o o
C C
3
AME, Inc.
AME8510 / 8520 / 8530
Micropower µP Watch Dog Timer
n Electrical Specifications
PARAMETER
VDD Range Supply Current Reset Threshold* ResetB Output Voltage Hgh VOH Reset Output Voltage Hgh ResetB Output Voltage Low VOL Reset Output Voltage Low VDD to Reset Delay Reset Timeout Period* Watch Dog Timeout Period* WDI Pulse Width TD1 TD2 TWD TWDI WDIIL WDI Input Threshold WDIIH IIL WDI Input Current IIH MRBIL MRB Input Threshold MRBIH MRB Pulse Width MRB Noise Immunity (pulse width with no reset) MRB to Reset Delay MRB Pull Up Resistance TDMRB TWMRB
T A = 25 o C unless otherwse noted i
SYMBOL
VRANGE IDD VTH VDD>VTH max VDDVTH max VDD = VTH - 100mV TA=-40~850C Version E Version F 140 1120 50 0.7 VDD = VTH x 1.2 0.8VDD WDI = 0V WDI = VDD = 5.0V -15 -8 µA 8 15 0.7 VDD = VTH x 1.2 0.8VDD 1 100 500 80 120 µS nS nS Kohm V V ISOURCE=0.5mA, TA=-40~850C WDI and MRB unconnected VTH - 1.5%
TEST CONDITIONS
MIN
1
TYP
MAX
5.5
UNITS
V µA V
3
10 VTH + 1.5%
0.8VDD
V
ISNK=1.2mA, TA=-40~850C
0.5
V
40 210 1760 280 2400
µS mS mS nS V
* See the chart on page 2 for available values of this parameter.
4
AME, Inc.
AME8510 / 8520 / 8530
Micropower µP Watch Dog Timer
n Pin Description
P i n Number A M E8510 AME8520 A M E8530 Na m e De scri ption
1
1
1
This pin may be either RESET or RESETB. RESETB is active low. In the case of the AME8520 and AME8530 this RE S ET/ pin will always be the opposite polarity from RESETB pin 3. This pin can be push/pull or open drain. GND Ground
2
2
2
N/ A
3
3
This pin may be either RESETB or RESET. RESET is active high. In the case of the AME8520 and AME8530 this pin will RE S ET/ always be the opposite polarity from pin 1. RESETB This pin can be either push/pull or open drain.
3
N/ A
4
M RB
M anual Reset. Active low. Pulling this pin low forces a reset. After a low to high transition reset remains asserted for exactly one reset timeout period. This pin is internally pulled high. If this function is unused then float this pin or tie it to VD D . W atc h Dog Input. Any transition on this pin will reset the watch dog timer. If this pin remains high or low for longer than the watch dog interval then a reset is asserted. Float or tristate this pin to disable the watch dog feature. P os it ive power supply. A reset is asserted after this voltage drops below a predetermined level. After VD D rises above that level reset remains asserted until the end of the reset timeout period.
4
4
N/ A
W DI
5
5
5
VDD
5
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