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參數(shù)資料
| 型號(hào)： | LM79 |
| 文件頁數(shù)： | 6/31頁 |
| 文件大?。?/td> | 481K |
| 代理商： | LM79 |
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DC Electrical Characteristics
(Continued)
The following specifications apply for +4.25 V
DC
≤
V
CC
≤
+5.75 V
, f
= 8.33 MHz, R
= 25
, unless otherwise speci-
fied.
Boldface limits apply for T
A
= T
J
= T
MIN
to T
MAX
;
all other limits T
A
= T
J
= 25C. (Note 7)
Symbol
Parameter
Conditions
Typical
(Note 8)
Limits
(Note 9)
Units
(Limits)
FAN RPM-TO-DIGITAL CONVERTER
FAN1 and FAN2 Nominal Input
RPM (See Section 6.0)
Divisor = 1, Fan Count = 153
(Note 12)
Divisor = 2, Fan Count = 153
(Note 12)
Divisor = 3, Fan Count = 153
(Note 12)
Divisor = 4, Fan Count = 153
(Note 12)
Fan Count = 153 (Note 12)
+25C
≤
T
A
≤
+75C
8800
RPM
4400
RPM
2200
RPM
1100
RPM
FAN3 Design Nominal Input RPM
Internal Clock Frequency
4400
22.5
RPM
kHz (min)
kHz (max)
kHz (min)
kHz (max)
20.2
24.8
19.1
25.9
10C
≤
T
A
≤
+100C
22.5
DIGITAL OUTPUTS (VID4/NTEST, NMI/IRQ)
V
OUT(1)
Logical “1” Output Voltage
V
OUT(0)
Logical “0” Output Voltage
ISA D0–D7 DIGITAL OUTPUTS
V
OUT(1)
Logical “1” Output Voltage
V
OUT(0)
Logical “0” Output Voltage
I
OUT
TRI-STATE
Output Current
I
OUT
=
±
5.0 mA
I
OUT
=
±
5.0 mA
2.4
0.4
V (min)
V (max)
I
OUT
=
±
12.0 mA
I
OUT
=
±
12.0 mA
V
OUT
= 0 V
DC
V
OUT
= V
CC
2.4
0.4
1
1
V (min)
V (max)
μA (max)
μA (min)
0.005
0.005
OPEN DRAIN DIGITAL OUTPUTS (Power Switch Bypass, SDA, RESET, SMI, Chassis Intrusion)
V
OUT(0)
Logical “0” Output Voltage
I
OH
High Level Output Current
RESET and Chassis Intrusion
Pulse Width
DIGITAL INPUTS: SMI__IN, VID0–VID3, VID4/NTEST, BTI, CS, A0, A1, A2, Mode Control and Interface Inputs (IORD, IOWR,
SYSCLK), Data Lines (D0–D7), Chassis Intrusion, and Tach Pulse Logic Inputs (FAN1, FAN2, FAN3)
V
IN(1)
Logical “1” Input Voltage
V
IN(0)
Logical “0” Input Voltage
SERIAL BUS DIGITAL INPUTS (SCL, SDA)
V
IN(1)
Logical “1” Input Voltage
V
IN(0)
Logical “0” Input Voltage
ALL DIGITAL INPUTS EXCEPT FOR BTI
I
IN(1)
Logical “1” Input Current
V
IN
= V
CC
I
IN(0)
Logical “0” Input Current
V
IN
= 0 V
DC
C
IN
Digital Input Capacitance
BIT DIGITAL INPUT
I
IN(1)
Logical “1” Input Current
V
IN
= V
CC
I
IN(0)
Logical “0” Input Current
V
IN
= 0 V
DC
C
IN
Digital Input Capacitance
I
OUT
= 5.0 mA
V
OUT
= V
CC
0.4
100
20
V (min)
μA (max)
ms (min)
0.1
45
2.0
0.8
V (min)
V (max)
0.7 x V
CC
0.3 x V
CC
V (min)
V (max)
0.005
0.005
20
1
1
μA (min)
μA (max)
pF
1
10
μA (max)
μA (max)
pF
500
20
2000
L
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