Consult LTC Marketing for parts specified with wider operating temperature ranges.*The temperature grade is identified by a label on the shipping container
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 3.3V, VLn = 0.45V, VHn = 0.55V,
LATCH
= V
CC
, SEL = V
CC
,
DIS = Open unless otherwise noted. (Note 2)
SYMBOL
V
SHUNT
ΔV
SHUNT
V
CC
V
CCR(MIN)
V
CC(UVLO)
ΔV
CC(UVHYST)
I
CC
V
REF
V
UOT
t
UOD
I
VHL
t
UOTO
V
LATCH(IH)
V
LATCH(IL)
I
LATCH
V
DIS(IH)
V
DIS(IL)
I
DIS
I
TMR(UP)
I
TMR(DOWN)
PARAMETER
V
CC
Shunt Regulator Voltage
V
CC
Shunt Regulator Load Regulation
Supply Voltage (Note 3)
Minimum V
CC
Output Valid
Supply Undervoltage Lockout
Supply Undervoltage Lockout Hysteresis
Supply Current
Reference Output Voltage
Undervoltage/Overvoltage Voltage Threshold
Undervoltage/Overvoltage Voltage Threshold
to Output Delay
VHn, VLn Input Current
–40ºC < T
A
< 125ºC
UV/OV
Time-Out Period
OV
Latch Clear Input High
OV
Latch Clear Threshold Input Low
LATCH
Input Current
DIS Input High
DIS Input Low
DIS Input Current
TMR Pull-Up Current
TMR Pull-Down Current
V
DIS
> 0.5V
V
TMR
= 0V
–40ºC < T
A
< 125ºC
V
TMR
= 1.6V
–40ºC < T
A
< 125ºC
V
LATCH
> 0.5V
C
TMR
= 1nF
–40ºC < T
A
< 125ºC
VHn = V
UOT
– 5mV or VLn = V
UOT
+ 5mV
DIS = 0V
V
CC
Rising, DIS = 0V
DIS = 0V
V
CC
= 2.3V to 6V
I
VREF
= ±1mA
–40ºC < T
A
< 125ºC
CONDITIONS
I
CC
= 5mA
–40ºC < T
A
< 125ºC
I
CC
= 2mA to 10mA
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
elecTrical characTerisTics
MIN
6.2
6.2
2.3
1.9
5
0.985
0.985
492
50
TYP
6.6
6.6
200
MAX
6.9
7.0
300
V
SHUNT
1
UNITS
V
V
mV
V
V
V
mV
µA
V
V
mV
µs
nA
nA
ms
ms
V
V
µA
V
V
µA
µA
µA
µA
µA
2
25
62
1
1
500
125
2.1
50
100
1.015
1.020
508
500
±15
±30
6
6
1.2
8.5
8.5
12.5
14
0.8
±1
1.2
0.8
1
–1.3
–1.2
1.3
1.2
2
–2.1
–2.1
2.1
2.1
3
–2.8
–2.8
2.8
2.8
2914fc
For more information
www.linear.com/LTC2914
3
LTC2914
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 3.3V, VLn = 0.45V, VHn = 0.55V,
LATCH
= V
CC
, SEL = V
CC
,
DIS = Open unless otherwise noted. (Note 2)
SYMBOL
V
TMR(DIS)
V
OH
V
OL
PARAMETER
Timer Disable Voltage
Output Voltage High
UV/OV
Output Voltage Low
UV/OV
CONDITIONS
Referenced to V
CC
V
CC
= 2.3V, I
UV/OV
= –1µA
V
CC
= 2.3V, I
UV/OV
= 2.5mA
V
CC
= 1V, I
UV
= 100µA
l
l
l
l
elecTrical characTerisTics
MIN
–180
1
TYP
–270
0.1
0.01
MAX
UNITS
mV
V
0.3
0.15
0.4
V
V
V
V
V
V
µA
µA
µs
Three-State Input SEL
V
IL
V
IH
V
Z
I
SEL
I
SEL(MAX)
t
PW
Low Level Input Voltage
High Level Input Voltage
Pin Voltage when Left in Hi-Z State
SEL High, Low Input Current
Maximum SEL Input Current
Latch Clear Pulse Width
SEL Tied to Either V
CC
or GND
(Note 4)
I
SEL
= ±10µA
–40ºC < T
A
< 125ºC
l
l
l
l
l
l
l
1.4
0.7
0.6
0.9
0.9
1.1
1.2
±25
±30
2
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
All currents into pins are positive; all voltages are referenced to
GND unless otherwise noted.
Note 3:
V
CC
maximum pin voltage is limited by input current. Since the
V
CC
pin has an internal 6.5V shunt regulator, a low impedance supply that
exceeds 6V may exceed the rated terminal current. Operation from higher
voltage supplies requires a series dropping resistor. See Applications
Information.
Note 4:
Guaranteed by design, not subject to test.
2914fc
4
For more information
www.linear.com/LTC2914
LTC2914
TiMing DiagraMs
VHn Monitor Timing
VHn
V
UOT
t
UOD
UV
1V
2914 TD01
VLn Monitor Timing
VLn
V
UOT
t
UOD
OV
1V
2914 TD02
t
UOTO
t
UOTO
VHn Monitor Timing (TMR Pin Strapped to V
CC
)
VHn
V
UOT
t
UOD
UV
1V
2914 TD03
VLn Monitor Timing (TMR Pin Strapped to V
CC
)
VLn
V
UOT
t
UOD
OV
1V
2914 TD04
t
UOD
t
UOD
NOTE:
WHEN AN INPUT IS CONFIGURED AS A NEGATIVE SUPPLY MONITOR, VHn WILL TRIGGER AN OV CONDITION AND VLn WILL TRIGGER A UV CONDITION
C++ 属于面向对象的编程语言，OOP的思想不必多说，特别对于复杂的软件工程来说，利用OOP绝对是事半功倍，相对于传统的C来说； 当然用C来写单片机程序无可厚非，已经延续了一个传统，从大学时学的开始到工作岗位，好多人都是一直用C来做，但是既然Keil支持C++编译， 可以用C++来编写你的代码，可以利用高级语言来结构化，清晰化你的程序，为嘛不用呢！哈哈，个人看法！下面进入正题： C+...[详细]
电源技术
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
