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74F657 数据表(PDF) 5 Page - Fairchild Semiconductor

部件名 74F657
功能描述  Octal Bidirectional Transceiver with 8-Bit Parity Generator/Checker and 3-STATE Outputs
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制造商  FAIRCHILD [Fairchild Semiconductor]
网页  http://www.fairchildsemi.com
标志 FAIRCHILD - Fairchild Semiconductor

74F657 数据表(HTML) 5 Page - Fairchild Semiconductor

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AC Electrical Characteristics
Note 3: These delay times reflect the 3-STATE recovery time only and not the signal time through the buffers or the parity check circuity. To assure VALID
information at the ERROR pin, time must be allowed for the signal to propagate through the drivers (B to A), through the parity check circuitry (same as A to
PARITY), and to the ERROR output after the ERROR pin has been enabled (Output Enable times). VALID data at the ERROR pin
≥ (A to PARITY) + (Output
Enable Time).
Symbol
Parameter
TA = +25°CTA = −55°C to +125°CTA = 0°C to +70°C
Units
VCC = +5.0V
VCC = +5.0V
VCC = +5.0V
CL = 50 pF
CL = 50 pF
CL = 50 pF
Min
Typ
Max
Min
Max
Min
Max
tPLH
Propagation Delay
2.5
4.5
8.0
2.5
9.5
2.5
9.0
ns
tPHL
An to Bn, Bn to An
3.0
4.9
7.5
3.0
8.5
3.0
8.0
tPLH
Propagation Delay
6.5
10.1
14.0
5.5
18.0
6.0
16.0
ns
tPHL
An to Parity
7.0
10.9
15.0
5.5
20.5
6.0
16.5
tPLH
Propagation Delay
4.5
7.8
11.0
4.0
14.0
4.0
13.0
ns
tPHL
ODD/EVEN to PARITY
4.5
8.8
12.0
4.5
16.5
4.5
13.5
tPLH
Propagation Delay
4.5
7.5
11.0
4.0
14.0
4.0
13.0
ns
tPHL
ODD/EVEN to ERROR
4.5
8.2
12.0
4.5
16.5
4.5
13.5
tPLH
Propagation Delay
8.0
14.0
20.5
7.5
27.0
7.5
23.0
ns
tPHL
Bn to ERROR
8.0
15.0
21.5
7.5
28.5
7.5
23.5
tPLH
Propagation Delay
7.0
10.8
15.5
6.0
20.0
6.0
17.0
ns
tPHL
PARITY to ERROR
7.5
11.8
16.5
6.5
22.0
7.5
18.5
tPZH
Output Enable Time
3.0
5.0
8.0
2.5
11.0
2.5
9.5
ns
tPZL
OE to An/Bn
4.0
6.5
10.0
3.5
13.5
3.5
11.0
tPHZ
Output Disable Time
1.0
4.5
8.0
1.0
9.5
1.0
9.0
ns
tPLZ
OE to An/Bn
1.0
4.9
7.5
1.0
8.5
1.0
8.0
tPZH
Output Enable Time
3.0
5.0
8.0
2.5
11.0
2.5
9.5
ns
tPZL
OE to ERROR (Note 3)
4.0
7.7
10.0
3.5
13.5
3.5
11.0
tPHZ
Output Disable Time
1.0
4.5
8.0
1.0
9.5
1.0
9.0
ns
tPLZ
OE to ERROR
1.0
4.9
7.5
1.0
8.5
1.0
8.0
tPZH
Output Enable Time
3.0
5.0
8.0
2.5
11.0
2.5
9.5
ns
tPZL
OE to PARITY
4.0
7.7
10.0
3.5
13.5
3.5
11.0
tPHZ
Output Disable Time
1.0
4.6
8.0
1.0
9.5
1.0
9.0
ns
tPLZ
OE to PARITY
1.0
5.1
7.5
1.0
8.5
1.0
8.0


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