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74FR245SJ Datasheet(Fiches technique) 4 Page - Fairchild Semiconductor

Numéro de pièce 74FR245SJ
Description  Octal Bidirectional Transceiver with 3-STATE Outputs
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Fabricant  FAIRCHILD [Fairchild Semiconductor]
Site Internet  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74FR245SJ Datasheet(HTML) 4 Page - Fairchild Semiconductor

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4
AC Electrical Characteristics
Extended AC Characteristics
Note 3: This specification is guaranteed but not tested. The limits apply to propagation delays for all paths described switching in phase, i.e., all LOW-to-
HIGH, HIGH-to-LOW, 3-STATE-to-HIGH, etc.
Note 4: These specifications guaranteed but not tested. The limits represent propagation delays with 250 pF load capacitors in place of the 50 pF load
capacitors in the standard AC load. This specification pertains to single output switching only.
Note 5: Skew is defined as the absolute value of the difference between the actual propagation delays for any two outputs of the same device. The specifi-
cation applies to any outputs switching HIGH-to-LOW (tOSHL), LOW-to-HIGH (tOSLH), or HIGH-to-LOW and/or LOW-to-HIGH (tOST). Specifications guaran-
teed with all outputs switching in phase.
Symbol
Parameter
TA = +25°CTA = 0°C to +70°C
Units
VCC = +5.0V
VCC = +5.0V
CL = 50 pF
CL = 50 pF
Min
Typ
Max
Min
Max
tPLH
Propagation Delay
1.0
2.6
3.9
1.0
3.9
ns
tPHL
An to Bn or Bn to An
1.0
1.7
3.9
1.0
3.9
tPZH
Output Enable Time
2.5
5.0
7.0
2.5
7.0
ns
tPZL
2.5
4.3
7.0
2.5
7.0
tPHZ
Output Disable Time
1.7
3.7
6.5
1.7
6.5
ns
tPLZ
1.7
3.6
6.5
1.7
6.5
Symbol
Parameter
TA = 0°C to +70°CTA = 0°C to +70°CUnits
VCC = +5.0V
VCC = +5.0V
CL = 50 pF
CL = 250 pF
Eight Outputs Switching
(Note 4)
(Note 3)
Min
Max
Min
Max
tPLH
Propagation Delay
1.0
5.9
2.5
7.5
ns
tPHL
An to Bn or Bn to An
1.05.9
2.57.5
tPZH
Output Enable Time
2.5
11.9
ns
tPZL
2.5
11.9
tPHZ
Output Disable Time
1.3
6.5
ns
tPLZ
1.3
6.5
tOSHL
Pin to Pin Skew
1.7
ns
(Note 5)
for HL Transitions
tOSLH
Pin to Pin Skew
1.0
ns
(Note 5)
for LH Transitions
tOST
Pin to Pin Skew
3.3
ns
(Note 5)
for HL/LH Transitions


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