ADM8699ARNZ [ROCHESTER]
1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8, SOIC-8;
| 型号： | ADM8699ARNZ |
| 厂家： | 
Rochester Electronics |
| 描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8, SOIC-8 光电二极管 |
| 文件： | 总5页 (文件大小：780K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Microprocessor
Supervisory Circuits
a
ADM8698/ADM8699
FUNCTIO NAL BLO CK D IAGRAM
FEATURES
Superior Upgrade for ADM698/ ADM699, MAX698/ MAX699
Guaranteed RESET Assertion w ith VCC = 1 V
Low 70 A Supply Current
Precision 4.65 V Voltage Monitor
Pow er OK/ Reset Tim e Delay
ADM8698/
ADM8699
RESET*
V
CC
RESET
GENERATOR
RESET
Watchdog Tim er
Minim um Com ponent Count
4.65V
Perform ance Specified over Tem perature
WATCHDOG
INPUT
WATCHDOG
WATCHDOG
APPLICATIONS
Microprocessor System s
Com puters
TRANSITION DETECTOR
OUTPUT WDO*
WDI*
(1 sec)
Controllers
*WDI (ADM8699 ONLY)
RESET (SOIC ONLY)
WDO (ADM8699 SOIC ONLY)
Intelligent Instrum ents
Autom otive System s
Critical P Pow er Monitoring
TYP ICAL AP P LICATIO N CIRCUIT
+5V
GENERAL D ESCRIP TIO N
T he ADM8698/ADM8699 supervisory circuits provide power
supply monitoring and watchdog timing for microprocessor
systems.
VCC
µP POWER
µP RESET
RESET
T he ADM8698 monitors the 5 V VCC power supply and gener-
ates a RESET pulse during power up, power down and during
low voltage “Brown Out” conditions. T he RESET output is
guaranteed to be functional (logic low) with VCC as low as 1 V.
ADM8698/
ADM8699
µP SYSTEM
WDI
*
I/O LINE
GND
T he ADM8699 features an identical monitoring circuit as in the
ADM8698, plus an additional watchdog timer input to monitor
microprocessor activity. T he RESET output is forced low if the
watchdog input is not toggled within the 1 second watchdog
timeout period.
*ADM8699 ONLY
Both parts are available in 8-pin plastic DIP/SOIC and 16-lead
SOIC packages. T he 16-lead SOIC contains additional out-
puts RESET (without inversion) and Watchdog Output WDO
(ADM8699 only).
REV. 0
Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties
which m ay result from its use. No license is granted by im plication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.
Tel: 617/ 329-4700
Fax: 617/ 326-8703
World Wide Web Site: http:/ / w w w .analog.com
© Analog Devices, Inc., 1997
ADM8698/ADM8699–SPECIFICATIONS (V = +5 V ؎ 10%, T = TMIN to TMAX unless otherwise noted)
CC
A
P aram eter
Min
Typ
Max
Units
Test Conditions/Com m ents
VCC Operating Voltage Range
Supply Current
3.0
5.5
100
V
µA
70
Power-Down Reset Assertion
Power-Up Reset Deassertion
Reset T hreshold Hysteresis
Reset Active T ime
4.5
4.65
4.75
V
40
200
mV
ms
140
280
Watchdog T imeout Period (ADM8699)
Minimum WDI Input Pulse Width
1.0
50
1.6
2.25
s
ns
VIL = 0.4, VIH = 0.8 (VCC)
RESET Output Voltage
RESET Output Voltage (VCC = 1 V)
0.4
200
V
mV
V
V
V
ISINK = 3.2 mA, VCC = 4.4 V
ISINK = 100 µA, VCC = 1.0 V
ISOURCE = 500 µA, VCC = 5 V
ISINK = 3.2 mA, VCC = 5 V
ISOURCE = 1 µA, VCC = 4.4 V
Output Sink Current
12
3.5
3.5
RESET and WDO Output Voltage
RESET Output Short Circuit Current
0.4
45
mA
WDI Input T hreshold (ADM8699)
Logic Low
0.8
V
Logic High
3.5
V
WDI Input Current
+1
–1
+10
µA
µA
WDI = VCC
WDI = 0 V
–10
Specifications subject to change without notice.
ABSO LUTE MAXIMUM RATINGS*
O RD ERING GUID E
(T A = +25°C unless otherwise noted)
Tem perature
Range
P ackage
O ptions*
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V
All Other Inputs . . . . . . . . . . . . . . . . . . . –0.3 V to VCC + 0.3 V
Power Dissipation 8-Pin DIP . . . . . . . . . . . . . . . . . . . . 500 mW
Model
ADM8698AN
ADM8698ARW
ADM8698ARN
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
N-8
R-16
R-8
θ
JA, T hermal Impedance . . . . . . . . . . . . . . . . . . . . +120°C/W
Power Dissipation 16-Pin SOIC . . . . . . . . . . . . . . . . . 375 mW
JA, T hermal Impedance . . . . . . . . . . . . . . . . . . . . +110°C/W
Power Dissipation 8-Pin SOIC . . . . . . . . . . . . . . . . . . 500 mW
JA, T hermal Impedance . . . . . . . . . . . . . . . . . . . . +125°C/W
θ
ADM8699AN
ADM8699ARW
ADM8699ARN
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
N-8
R-16
R-8
θ
Operating T emperature Range
Industrial (A Version) . . . . . . . . . . . . . . . . . –40°C to +85°C
Storage T emperature Range . . . . . . . . . . . . . –65°C to +150°C
Lead T emperature (Soldering, 10 secs) . . . . . . . . . . . . +300°C
Vapor Phase (60 secs) . . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 secs) . . . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . >4 kV
*N = Plastic DIP; R = Small Outline.
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. T his is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational sections
of this specification is not implied. Exposure to absolute maximum ratings for
extended periods of time may affect device reliability.
–2–
REV. 0
ADM8698/ADM8699
P IN FUNCTIO N D ESCRIP TIO NS
Mnem onic Function
TYPICAL PERFORMANCE CURVES
A4
3.36 V
VCC
+5 V Power Supply Input.
GND
RESET
0 V. Ground reference for all signals.
100
90
Logic Output. RESET goes low whenever VCC
falls below the reset voltage threshold (4.65 V
typ). RESET remains low for a minimum of
140 ms after VCC returns to 5 V. RESET also
goes low for a minimum of 140 ms if the watchdog
timer is enabled but not serviced within its time-
out period.
10
0%
1V
1V
500ms
WDI
Watchdog Input. WDI is a three level input. If
WDI remains either high or low for longer than
the watchdog timeout period, RESET pulses low
and WDO goes low. T he timer resets with each
transition on the WDI line. T he watchdog timer
may be disabled if WDI is left floating or is driven
to midsupply.
Figure 1. RESET Output Voltage vs. VCC
230
220
210
200
190
180
170
RESET
(SOIC packages only) Logic Output. RESET is
an active high output. It is the inverse of RESET.
WDO
(SOIC ADM8699 only) Logic Output. T he
Watchdog Output, WDO, goes low if WDI
remains either high or low for longer than the
watchdog timeout period. WDO is set high by the
next transition at WDI. If WDI is unconnected or
at midsupply, the watchdog timer is disabled and
WDO remains high.
–50
–30
–10
10
30
50
70
90
TEMPERATURE – °C
Figure 2. RESET Tim eout Delay vs. Tem perature
P IN CO NFIGURATIO NS
8-Lead D IP & SO IC
4.69
4.67
4.65
4.63
V
V
1
2
3
4
8
7
6
5
GND
CC
ADM8698/
RESET
CC
ADM8699
TOP VIEW
(Not to Scale)
GND
GND
NC (WDI)*
NC
4.61
4.59
4.57
4.55
*( ) ADM8699 ONLY
NC = NO CONNECT
16-Lead SO IC
–60
–30
0
30
60
90
120
TEMPERATURE – °C
GND
1
2
3
4
5
6
7
8
16 RESET
15 RESET
VCC
VCC
ADM8698/
ADM8699
Figure 3. RESET Voltage Threshold vs. Tem perature
14 NC (WDO)
13 NC
*
GND
NC
TOP VIEW
(Not to Scale)
12 NC
NC
11 NC (WDI)
*
NC
10 NC
NC
9 GND
*( ) ADM8699 ONLY
NC = NO CONNECT
REV. 0
–3–
ADM8698/ADM8699
CIRCUIT INFO RMATIO N
Watchdog Tim er (AD M8699 O nly)
P ower Fail RESET
T he watchdog timer input (WDI) monitors an I/O line from the
µP system. T he µP must toggle this input once every 1.6 sec-
onds to verify correct software execution. Failure to toggle the
line indicates that the µP system is not correctly executing its
program and may be tied up in an endless loop. If this happens,
a reset pulse is generated to initialize the processor.
A precision voltage detector monitors VCC and generates a
RESET output to hold the microprocessor’s Reset line low when
VCC falls below the reset threshold 4.65 V (see Figure 4). T he
reset voltage threshold is set to accommodate a 5% variation on
VCC. T he voltage detector has 40 mV hysteresis to ensure that
glitches on VCC do not activate the RESET output.
T he WDI input is a three level input and will recognize a low-
to-high or high-to-low transition on its input. T he watchdog
timer is reset by each WDI transition and then begins its timeout
period. If the WDI pin remains either high or low, reset pulses
will be issued every 1.6 seconds typically. If the watchdog timer
is not needed, the WDI input should be left floating.
On power-up, an internal monostable holds RESET low for
140 ms after VCC rises above the reset threshold. T his allows the
power supply to stabilize on power-up and also prevents repeated
toggling of RESET even if the 5 V power drops out and recovers
with each power line cycle. In order to prevent mistriggering
due to transient voltage spikes, it is recommended that a 0.1 µF
capacitor be connected at the VCC pin.
T he Watchdog Output (WDO) (SOIC package Only) provides
watchdog status information. It is driven low if WDI is not
toggled within the watchdog timeout period. It goes high at the
next WDI transition. It is also set high when VCC falls below the
reset threshold.
T he RESET output is guaranteed to remain low with VCC, as
low as 1 V. T his holds the microprocessor in a stable shutdown
condition as the power supply comes up.
On the 16-lead SOIC package, an active high RESET output is
also provided. T his is the complement of RESET and is in-
tended for microprocessors requiring an active high signal.
WDI
V2
V2
VCC
V1
V1
WDO
t
t
2
2
RESET
t1
t1
RESET
V1 = RESET VOLTAGE THRESHOLD
t
t
t
1
1
1
V
2 = RESET VOLTAGE THRESHOLD +
THRESHOLD HYSTERESIS
t
1 = RESET TIME
t
t
= RESET TIME
= WATCHDOG TIME OUT PERIOD
1
2
Figure 4. Watchdog Tim eout Period vs. Tem perature
Figure 5. Watchdog Tim eout Period and Reset Active Tim e
O UTLINE D IMENSIO NS
D imensions shown in inches and (mm).
8-P in P lastic D IP (N-8)
8-P in SO IC (R-8)
16-Lead SO IC (R-16)
0.1968 (5.00)
0.1890 (4.80)
16
9
8
1
5
4
8
1
5
4
0.25 0.31
(6.35) (7.87)
PIN 1
0.1574 (4.00)
0.1497 (3.80)
0.2440 (6.20)
0.2284 (5.80)
0.419
(10.65)
0.299
(7.60)
0.430 (10.92)
MAX
0.102 (2.59)
0.094 (2.39)
PIN 1
1
8
0.035
(0.89)
0.0098 (0.25)
0.0040 (0.10)
0.413 (10.50)
0.125
(3.18)
MIN
0.18 (4.57)
0.0500 0.0192 (0.49)
0.012
(0.3)
SEATING
PLANE
(1.27)
BSC
0.0138 (0.35)
0.018 (0.46)
0.104
(2.65)
SEATING
PLANE
0.1 (2.54)
BSC
0.0196 (0.50)
0.033 (0.84)
0.05 (1.27)
REF
0.019 (0.49)
x 45°
0.0099 (0.25)
0.18
(4.57)
MAX
0.030
(0.75)
8°
0°
0.011
(0.28)
0.013
(0.32)
0.0500 (1.27)
0.0160 (0.41)
0.0098 (0.25)
0.0075 (0.19)
0.042
(1.07)
0.3 (7.62)
–4–
REV. 0
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