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74ABT646CSC Arkusz danych(PDF) 6 Page - Fairchild Semiconductor

Numer części 74ABT646CSC
Szczegółowy opis  Octal Transceivers and Registers with 3-STATE Outputs
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Producent  FAIRCHILD [Fairchild Semiconductor]
Strona internetowa  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74ABT646CSC Arkusz danych(HTML) 6 Page - Fairchild Semiconductor

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Extended AC Electrical Characteristics
(SOIC Package)
Note 9: 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, etc.).
Note 10: This specification is guaranteed but not tested. The limits represent propagation delay with 250 pF load capacitors in place of the 50 pF load capac-
itors in the standard AC load. This specification pertains to single output switching only.
Note 11: This specification is guaranteed but not tested. The limits represent propagation delays for all paths described switching in phase
(i.e., all LOW-to-HIGH, HIGH-to-LOW, etc.) with 250 pF load capacitors in place of the 50 pF load capacitors in the standard AC load.
Note 12: The 3-STATE delays are dominated by the RC network (500
Ω, 250 pF) on the output and has been excluded from the datasheet.
Skew
(SOIC Package)
Note 13: 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, etc.).
Note 14: This specification is 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.
Note 15: Skew is defined as the absolute value of the difference between the actual propagation delays for any two separate outputs of the same device.
The specification applies to any outputs switching HIGH-to-LOW (tOSHL), LOW-to-HIGH (tOSLH), or any combination switching LOW-to-HIGH and/or HIGH-
to-LOW (tOST). This specification is guaranteed but not tested.
Note 16: This describes the difference between the delay of the LOW-to-HIGH and the HIGH-to-LOW transition on the same pin. It is measured across all
the outputs (drivers) on the same chip, the worst (largest delta) number is the guaranteed specification. This specification is guaranteed but not tested.
Note 17: Propagation delay variation for a given set of conditions (i.e., temperature and VCC) from device to device. This specification is guaranteed but not
tested.
Capacitance
Note 18: CI/O is measured at frequency, f = 1 MHz, per MIL-STD-883, Method 3012.
Symbol
Parameter
TA = −40°C to +85°C
TA = −40°C to +85°C
TA = −40°C to +85°C
Units
VCC = 4.5V–5.5V
VCC = 4.5V–5.5V
VCC = 4.5V–5.5V
CL = 50 pF
CL = 250 pF
CL = 250 pF
8 Outputs Switching
1 Output Switching
8 Outputs Switching
(Note 9)
(Note 10)
(Note 11)
Min
Max
Min
Max
Min
Max
tPLH
Propagation Delay
1.5
5.5
2.0
7.5
2.5
10.0
ns
tPHL
Clock to Bus
1.5
5.5
2.0
7.5
2.5
10.0
tPLH
Propagation Delay
1.5
6.0
2.0
7.0
2.5
9.5
ns
tPHL
Bus to Bus
1.5
6.0
2.0
7.0
2.5
9.5
tPLH
Propagation Delay
1.5
6.0
2.0
7.5
2.5
10.0
ns
tPHL
SBA or SAB to An or Bn
1.5
6.0
2.0
7.5
2.5
10.0
tPZH
Output Enable Time
1.5
6.0
2.0
8.0
2.5
10.5
ns
tPZL
OEn or DIR to An or Bn
1.5
6.0
2.0
8.0
2.5
10.5
tPHZ
Output Disable Time
1.5
6.0
(Note 12)
(Note 12)
ns
tPLZ
OEn or DIR to An or Bn
1.5
6.0
Symbol
Parameter
TA = −40°C to +85°C
TA = −40°C to +85°C
Units
VCC = 4.5V–5.5V
VCC = 4.5V–5.5V
CL = 50 pF
CL = 250 pF
8 Outputs Switching
8 Outputs Switching
(Note 13)
(Note 14)
Max
Max
tOSHL (Note 15)
Pin to Pin Skew, HL Transitions
1.3
2.5
ns
tOSLH (Note 15)
Pin to Pin Skew, LH Transitions
1.0
2.0
ns
tPS (Note 16)
Duty Cycle, LH–HL Skew
2.0
4.0
ns
tOST (Note 15)
Pin to Pin Skew, LH/HL Transitions
2.0
4.0
ns
tPV (Note 17)
Device to Device Skew, LH/HL Transitions
2.5
4.5
ns
Symbol
Parameter
Typ
Units
Conditions
TA = 25°C
CIN
Input Capacitance
5
pF
VCC = 0V (non I/O pins)
CI/O (Note 18)
Output Capacitance
11
pF
VCC = 5.0V (An, Bn)


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