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NS32491 Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # NS32491
Description  Serial Network Interface
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

NS32491 Datasheet(HTML) 5 Page - National Semiconductor (TI)

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60 Absolute Maximum Ratings
Supply Voltage (VCC)6V
Input Voltage (TTL)
0 to 55V
Input Voltage (differential)
b
55 to a16V
Output Voltage (differential)
0 to 16V
Output Current (differential)
b
40 mA
Storage Temperature
b
65 to 150 C
Lead Temperature (soldering 10 sec)
300 C
Package Power Rating at 25 C
295W
(PC Board Mounted)
Derate Linearly at the rate of 238 mW C
For actual power dissipation of the device please refer to Section 70
ESD rating is to be determined
Recommended Operating
Conditions
Supply Voltage (VCC)5V g 5%
Ambient Temperature
0 to 70 C
Note
Absolute maximum ratings are those values beyond
which the safety of the device cannot be guaranteed They
are not meant to imply that the device should be operated at
these limits
70 Electrical Characteristics VCC e 5V g5% TA e 0 to 70 C (Notes12)
Symbol
Parameter
Test Conditions
Min
Max
Units
VIH
Input High Voltage (TTL and X1)
20
V
VIL
Input Low Voltage (TTL and X1)
08
V
IIH
Input High Current (TTL)
VIN e VCC
50
m
A
Input High Current (RXg CDg)VIN e VCC
500
m
A
IIL
Input Low Current (TTL)
VIN e 05V
b
300
m
A
Input Low Current (RXg CDg)VIN e 05V
b
700
m
A
VCL
Input Clamp Voltage (TTL)
IIN eb12 mA
b
12
V
VOH
Ouptut High Voltage (TTLMOS)
IOH eb100 mA
35
V
VOL
Output Low Voltage (TTLMOS)
IOL e 8 mA
05
V
IOS
Output Short Circuit Current (TTLMOS)
b
40
b
200
mA
VOD
Differential Output Voltage (TXg)78X termination and
g
500
g
1200
mV
270X from each to GND
VOB
Diff Output Voltage Imbalance (TXg)
same as above
g
40
mV
VDS
Diff Squelch Threshold (RXg CDg)
b
175
b
300
mV
VCM
Diff Input Common Mode Voltage (RXg CDg)
525
525
V
ICC
Power Supply Current
10Mbits
270
mA
80 Switching Characteristics VCC e 5V g5% TA e 0 to 70 C (Note 2)
Symbol
Parameter
Figure
Min
Typ
Max
Units
OSCILLATOR SPECIFICATION
tXTH
X1 to Transmit Clock High
12
8
20
ns
tXTL
X1 to Transmit Clock Low
12
8
20
ns
TRANSMIT SPECIFICATION
tTCd
Transmit Clock Duty Cycle at 50% (10 MHz)
12
42
50
58
%
tTCr
Transmit Clock Rise Time (20% to 80%)
12
8
ns
tTCf
Transmit Clock Fall Time (80% to 20%)
12
8
ns
tTDs
Transmit Data Setup Time to Transmit Clock Rising Edge
4
12
20
ns
tTDh
Transmit Data Hold Time from Transmit Clock Rising Edge
4
12
0
ns
tTEs
Transmit Enable Setup Time to Trans Clock Rising Edge
4
12
20
ns
tTEh
Transmit Enable Hold Time from Trans Clock Rising Edge
5
12
0
ns
tTOd
Transmit Output Delay from Transmit Clock Rising Edge
4
12
40
ns
tTOr
Transmit Output Rise Time (20% to 80%)
12
7
ns
tTOf
Transmit Output Fall Time (80% to 20%)
12
7
ns
tTOj
Transmit Output Jitter
12
g
025
ns
tTOh
Transmit Output High Before Idle in Half Step Mode
5
12
200
ns
tTOi
Transmit Output Idle Time in Half Step Mode
5
12
800
ns
Note 1
All currents into device pins are positive all currents out of device pins are negative All voltages are referenced to ground unless otherwise specified
Note 2
All typicals are given for VCC e 5V and TA e 25 C
5


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