74ABT244 查看數據表（PDF） - Fairchild Semiconductor
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74ABT244 Datasheet PDF : 13 Pages
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Extended AC Electrical Characteristics
SOIC package.
TA–40°C to +85°C,
VCC = 4.5V–5.5V,
CL = 50pF,
8 Outputs
Switching(8)
TA = –40°C to +85°C,
VCC = 4.5V–5.5V,
CL = 250pF,
1 Output
Switching(9)
TA = –40°C to +85°C,
VCC = 4.5V–5.5V,
CL = 250pF,
8 Outputs
Switching(10)
Symbol Parameter Min. Typ. Max. Min.
Max.
Min.
Max. Units
fTOGGLE Max Toggle
100
Frequency
MHz
tPLH Propagation Delay, 1.5
tPHL Data to Outputs
1.5
tPZH Output Enable Time 1.5
tPZL
1.5
tPHZ Output Disable Time 1.0
tPLZ
1.0
5.0
1.5
6.0
5.0
1.5
6.0
6.5
2.5
7.5
6.5
2.5
7.5
5.6
(11)
5.6
2.5
8.5
ns
2.5
8.5
2.5
10.0
ns
2.5
12.0
(11)
ns
Notes:
8. 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.).
9. This specification is guaranteed but not tested. The limits represent propagation delay with 250pF load capacitors
in place of the 50pF load capacitors in the standard AC load. This specification pertains to single output switching
only.
10. 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 250pF load capacitors in place of the 50pF load
capacitors in the standard AC load.
11. The 3-STATE delays are dominated by the RC network (500Ω, 250pF) on the output and have been excluded from
the datasheet.
©1992 Fairchild Semiconductor Corporation
74ABT244 Rev. 1.4
6
www.fairchildsemi.com
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