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参数资料
| 型号： | 933567190652 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 总线收发器 |
| 英文描述： | 4000/14000/40000 SERIES, OCTAL 1-BIT TRANSCEIVER, TRUE OUTPUT, PDIP20 |
| 封装： | PLASTIC, SOT-146-1, DIP-20 |
| 文件页数： | 5/6页 |
| 文件大小： | 80K |
| 代理商： | 933567190652 |
January 1995
5
Philips Semiconductors
Product specication
Octal bus transceiver with 3-state outputs
HEF40245B
buffers
AC CHARACTERISTICS
VSS = 0 V; Tamb =25 °C; CL = 50 pF; input transition times ≤ 20 ns
VDD
V
SYMBOL
MIN.
TYP.
MAX.
TYPICAL EXTRAPOLATION
FORMULA
Propagation delays
An → Bn
5
95
190
ns
83 ns
+ (0,24 ns/pF) CL
HIGH to LOW
10
tPHL
40
80
ns
35 ns
+ (0,10 ns/pF) CL
15
30
60
ns
26 ns
+ (0,07 ns/pF) CL
An → Bn
5
85
170
ns
82 ns
+ (0,06 ns/pF) CL
LOW to HIGH
10
tPLH
40
80
ns
38 ns
+ (0,03 ns/pF) CL
15
30
60
ns
29 ns
+ (0,02 ns/pF) CL
Output transition
5
40
80
ns
see Fig.6
times
10
tTHL
20
40
ns
HIGH to LOW
15
30
ns
530
60
ns
LOW to HIGH
10
tTLH
20
40
ns
15
30
ns
3-state propagation delays
Output disable times
EO
→ An,Bn
5
100
200
ns
HIGH
10
tPHZ
50
100
ns
15
40
80
ns
5
100
200
ns
LOW
10
tPLZ
60
120
ns
15
50
100
ns
Output enable times
EO
→ An,Bn
5
100
200
ns
HIGH
10
tPZH
45
90
ns
15
35
70
ns
5
115
230
ns
LOW
10
tPZL
55
110
ns
15
45
90
ns
ALL BUFFERS
SWITCHING
VDD
V
TYPICAL FORMULA FOR P (
W)
Dynamic power
5
4 250 fi +∑ (foCL) × VDD2
where
dissipation per
10
17 000 fi +∑ (foCL) × VDD2
fi = input freq. (MHz)
package (P)
15
46 000 fi +∑ (foCL) × VDD2
fo = output freq. (MHz)
CL = load capacitance (pF)
∑ (f
oCL) = sum of outputs
VDD = supply voltage (V)
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