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参数资料
| 型号： | LTC699IS8#TR |
| 厂商： | Linear Technology |
| 文件页数： | 4/4页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISORY CIRCUIT MPU 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.65V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
LTC699
A PPLICATI
S I FOR ATIO
V CC
V2
V1
V2
V1 = RESET VOLTAGE THRESHOLD
V2 = RESET VOLTAGE THRESHOLD +
V1
RESET THRESHOLD HYSTERESIS
RESET
t1
t1
t1 = RESET ACTIVE TIME
Figure 1. Reset Active Time
LTC699 F01
Watchdog Timer
The LTC699 provides a watchdog timer function to moni-
tor the activity of the microprocessor. If the microproces-
sor does not toggle the Watchdog Input (WDI) within the
time-out period, RESET is forced to active low for a
minimum of 140ms. The watchdog time-out period is
fixed at a 1.0 second minimum on the LTC699, which is
adequate time for most systems to service the watchdog
timer immediately after a reset. Figure 2 shows the timing
diagram of watchdog time-out period and reset active
time. The watchdog time-out period is restarted as soon
V CC = 5V
WDI
t2
as RESET is inactive. When either a high-to-low or low-to-
high transition occurs at the WDI pin prior to time-out, the
watchdog time is reset and begins to time out again. To
ensure the watchdog time does not time out, either a high-
to-low or low-to-high transition on the WDI pin must
occur at or less than the minimum time-out period. If the
input to the WDI pin remains either high or low, reset
pulses will be issued every 1.6 seconds typically. The
watchdog time can be deactivated by floating the WDI pin.
The timer is also disabled when V CC falls below the reset
voltage threshold.
t2
RESET
t1
t1
t1
LTC699 F02
t1 = RESET ACTIVE TIME
t2 = WATCHDOG TIME-OUT PERIOD
Figure 2. Watchdog Time-Out Period and Reset Active Time
PACKAGE DESCRIPTIO
N8 Package
8-Lead Plastic DIP
Dimensions in inches (millimeters) unless otherwise noted.
S8 Package
8-Lead Plastic SOIC
E
B 1
8
7
D
6
5
h × 45 °
8
7
D
6
5
A
C
A
A 1
Q 1
E 1
α
L
B
e 1
H
E
C
L
A 1
e A
SYMBOL
A
A 1
INCHES
0.130 ± 0.006
0.020 MIN
S
MILLIMETERS
3.302 ± 0.127
0.508 MIN
e 1 B
SYMBOL INCHES MILLIMETERS
E 1 0.250 ± 0.010 6.350 ± 0.254
e A 0.325 + 0.025 8.255 + 0.635
1
2 3
T JMAX
4
θ JA
N8 1191
SYMBOL
A
A 1
B
C
D
E
INCHES
0.053 – 0.069
0.004 – 0.010
0.014 – 0.019
0.008 – 0.010
0.189 – 0.197
0.150 – 0.157
MILLIMETERS
1.346 – 1.753
0.102 – 0.254
0.356 – 0.483
0.203 – 0.254
4.801 – 5.004
3.810 – 3.988
SYMBOL
e
H
h
L
α
INCHES MILLIMETERS
0.050 TYP 1.270 TYP
0.228 – 0.244 5.791 – 6.198
0.010 – 0.020 0.254 – 0.508
0.016 – 0.050 0.406 – 1.270
0° – 8° TYP
1
2
3
4
S8 1191
B
B 1
C
D
E
0.018 ± 0.003
0.045 – 0.065
0.009 – 0.015
0.400 MAX
0.300 – 0.320
0.457 ± 0.076
1.143 – 1.651
0.229 – 0.381
10.160 MAX
7.620 – 8.128
e 1
L
Q 1
S
–0.015 –0.381
0.100 ± 0.010 2.540 ± 0.254
0.125 MIN 3.175 MIN
0.065 TYP 1.651 TYP
0.045 ± 0.015 1.143 ± 0.381
110 ° C
130 ° C/W
T JMAX
110 ° C
θ JA
180 ° C/W
CONDITIONS: PCB MOUNT ON FR4 MATERIAL,
STILL AIR AT 25 ° C, COPPER TRACE
4
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 q FAX : (408) 434-0507 q TELEX : 499-3977
LT/GP 0192 10K REV 0
? LINEAR TECHNOLOGY CORPORATION 1992
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