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參數(shù)資料
| 型號(hào)： | LTC2900 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Octal Buffer/Driver With 3-State OUtputs 20-TVSOP -40 to 85 |
| 中文描述： | 可編程四路電源監(jiān)視器可調(diào)復(fù)位定時(shí)器 |
| 文件頁(yè)數(shù)： | 3/16頁(yè) |
| 文件大?。?/td> | 199K |
| 代理商： | LTC2900 |
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3
LTC2900
2900f
The
G
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25
°
C. V
CC
= 5V, unless otherwise noted. (Note 3)
SYMBOL
PARAMETER
I
V2
V2 Input Current
I
V3
V3 Input Current
ELECTRICAL CHARACTERISTICS
Note 1:
Absolute Maximum Ratings are those values beyond which the life of
a device may be impaired.
Note 2:
All currents into pins are positive, all voltages are referenced to GND
unless otherwise noted.
Note 3:
The greater of V1, V2 is the internal supply voltage (V
CC
).
Note 4:
Under static no-fault conditions, V1 will necessarily supply quiescent
current. If at any time V2 is larger than V1, V2 must be capable of supplying
TEST CIRCUITS
V1
V2
V3
V4
2900 F01
LTC2900-1
RST
I
SOURCE
1
V1
V2
V3
V4
2900 F02
LTC2900-1
RST
I
2.5mA,
100
μ
A
V1
V2
V3
V4
2900 F03
LTC2900-2
RST
I
200
μ
A
Figure 1. RST V
OH
Test
Figure 2. RST V
OL
Test
Figure 3. Active Pull-Up
RST V
OH
Test
the quiescent current, programming (transient) current and reference load
current.
Note 5:
The RST output pin on the LTC2900-1 has an internal pull-up to V2
of typically 6
μ
A. However, an external pull-up resistor may be used when
faster rise times are required or for V
OH
voltages greater than V2.
Note 6:
The push-pull RST output pin on the LTC2900-2 is activelypulled up
to V2.
CONDITIONS
V2 = 3.3V
V3 = 2.5V
V3 = 0.55V (ADJ Mode)
V4 = 1.8V
V4 = 0.55V (ADJ Mode)
V4 = –0.05V (–ADJ Mode)
V
CRT
= 0V
V
CRT
= 1.3V
C
RT
= 1500pF
V
X
Less Than Reset Threshold V
RTX
by More Than 1%
I
SINK
= 2.5mA; V1 = 3V, V2 = 3V;
V3, V4 = 0V; V
PG
= 0V
I
SINK
= 100
μ
A; V2 = 1V; V1, V3, V4 = 0V
I
SINK
= 100
μ
A; V1 = 1V; V2, V3, V4 = 0V
I
SOURCE
= 1
μ
A
MIN
TYP
0.8
0.52
MAX
2
1.2
15
0.8
15
15
–2.6
30
9
UNITS
G
μ
A
μ
A
nA
μ
A
nA
nA
μ
A
μ
A
ms
μ
s
G
G
–15
I
V4
V4 Input Current
G
G
G
0.34
–15
–15
–1.4
10
5
I
CRT(UP)
I
CRT(DN)
t
RST
t
UV
CRT Pull-Up Current
CRT Pull-Down Current
Reset Time-Out Period
V
X
Undervoltage Detect to RST
G
–2
20
7
150
G
G
V
OL
Output Voltage Low RST
G
0.15
0.4
V
G
G
0.05
0.05
0.3
0.3
V
V
V
V
OH
Output Voltage High RST (LTC2900-1)
(Note 5)
Output Voltage High RST (LTC2900-2)
(Note 6)
Manual Reset Pin
V
IH
PBR Input Threshold High
V
IL
PBR Input Threshold Low
t
PBW
PBR Input Pulse Width
t
PBD
Manual Reset Propagation Delay
I
PBR
PBR Pull-Up Current
G
V2 – 1
I
SOURCE
= 200
μ
A
G
0.8 V2
V
V
CC
= 3.3V to 5.5V
V
CC
= 3.3V to 5.5V
V
CC
= 3.3V
V
CC
= 3.3V, V
PBR
Falling
V
PBR
= 0V
G
1.6
V
V
G
0.4
150
G
ns
μ
s
μ
A
G
0.1
–10
1
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