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74ACQ657 数据表(PDF) 6 Page - Fairchild Semiconductor

部件名 74ACQ657
功能描述  Quiet Series??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

74ACQ657 数据表(HTML) 6 Page - Fairchild Semiconductor

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6
AC Electrical Characteristics for ACQ
Note 13: Voltage Range 3.3 is 3.3V
± 0.3V
Voltage Range 5.0 is 5.0V
± 0.5V
Note 14: Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs within the same packaged device.
The specification applies to any outputs switching in the same direction, either HIGH-to-LOW (tOSHL) or LOW-to-HIGH (tOSLH). Parameter guaranteed by
design. Not tested.
Note 15: These delay times reflect the 3-STATE recovery time only and not the signal time through the buffers or the parity check circuitry. 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).
VCC
TA = 25°CTA = −40°C to +85°C
Symbol
Parameter
(V)
CL = 50 pF
CL = 50 pF
Units
(Note 13)
Min
Typ
Max
Min
Max
tPLH
Propagation Delay
3.3
2.5
8.0
11.5
2.5
12.0
ns
tPHL
An to Bn, Bn to An
5.0
1.5
5.0
7.5
1.5
8.0
tPLH
Propagation Delay
3.3
3.0
11.5
16.5
3.0
17.0
ns
tPHL
An to Parity
5.0
2.0
7.0
10.5
2.0
11.0
tPLH
Propagation Delay
3.3
3.0
10.0
15.0
3.0
15.5
ns
tPHL
ODD/EVEN to PARITY
5.0
2.5
6.5
10.0
2.5
10.5
tPLH
Propagation Delay
3.3
3.0
10.0
15.0
3.0
15.5
ns
tPHL
ODD/EVEN to ERROR
5.0
2.5
6.5
10.0
2.5
10.5
tPLH
Propagation Delay
3.3
3.5
11.5
16.0
3.5
16.5
ns
tPHL
Bn to ERROR
5.0
2.5
7.0
10.5
2.5
11.0
tPLH
Propagation Delay
3.3
3.0
9.0
13.5
3.0
14.0
ns
tPHL
PARITY to ERROR
5.0
2.0
6.0
9.0
2.0
9.5
tPZH
Output Enable Time
3.3
2.5
9.0
13.5
2.5
14.0
ns
tPZL
OE to An/Bn
5.0
2.0
6.0
9.0
2.0
9.5
tPHZ
Output Disable Time
3.3
1.0
8.5
13.0
1.0
13.5
ns
tPLZ
OE to An/Bn
5.0
1.0
5.5
8.5
1.0
9.0
tPZH
Output Enable Time
3.3
2.5
9.0
13.5
2.5
14.0
ns
tPZL
OE to ERROR (Note 15)
5.0
2.0
6.0
9.0
2.0
9.5
tPHZ
Output Disable Time
3.3
1.0
8.5
13.0
1.0
13.5
ns
tPLZ
OE to ERROR
5.0
1.0
5.5
8.5
1.0
9.0
tPZH
Output Enable Time
3.3
2.5
9.0
13.5
2.5
14.0
ns
tPZL
OE to PARITY
5.0
2.0
6.0
9.0
2.0
9.5
tPHZ
Output Disable Time
3.3
1.0
8.5
13.0
1.0
13.5
ns
tPLZ
OE to PARITY
5.0
1.0
5.5
8.5
1.0
9.0
tOSHL
Output to Output Skew (Note 14)
3.3
1.0
1.5
1.5
ns
tOSLH
An, Bn to Bn, An
5.0
0.5
1.0
1.0


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