74AHCT157 데이터 시트보기 (PDF) - NXP Semiconductors.
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74AHCT157 Datasheet PDF : 16 Pages
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NXP Semiconductors
74AHC157; 74AHCT157
Quad 2-input multiplexer
Table 7. Dynamic characteristics …continued
GND = 0 V; For test circuit see Figure 9.
Symbol Parameter Conditions
25 °C
−40 °C to +85 °C −40 °C to +125 Unit
°C
Min Typ[1] Max Min
Max
Min
Max
CPD
power
CL = 50 pF; fi = 1 MHz;
[3]
dissipation VI = GND to VCC
capacitance 4 outputs switching via S
-
31
-
-
-
-
- pF
1 outputs switching via I
-
13
-
-
-
-
- pF
For type 74AHCT157
tpd
propagation nI0, nI1 to nY; see Figure 7 [2]
delay
VCC = 4.5 V to 5.5 V
CL = 15 pF
- 3.2 6.4 1.0
7.5
1.0
8.0 ns
CL = 50 pF
- 4.6 8.7 1.0
9.8
1.0
11.0 ns
S to nY; see Figure 7
VCC = 4.5 V to 5.5 V
CL = 15 pF
CL = 50 pF
E to nY; see Figure 8
- 3.7 8.6 1.0
10.0
1.0
11.0 ns
- 5.2 10.4 1.0
12.0
1.0
13.0 ns
[2]
VCC = 4.5 V to 5.5 V
CL = 15 pF
- 4.7 8.1 1.0
9.5
1.0
10.5 ns
CL = 50 pF
- 6.7 10.6 1.0
12.0
1.0
13.5 ns
CPD
power
CL = 50 pF; fi = 1 MHz;
[3]
dissipation VI = GND to VCC
capacitance 4 outputs switching via S
-
41
-
-
-
-
- pF
1 outputs switching via I
-
16
-
-
-
-
- pF
[1] Typical values are measured at nominal supply voltage (VCC = 3.3 V and VCC = 5.0 V).
[2] tpd is the same as tPLH and tPHL.
[3] CPD is used to determine the dynamic power dissipation PD (µW).
PD = CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where:
fi = input frequency in MHz;
fo = output frequency in MHz;
CL = output load capacitance in pF;
VCC = supply voltage in Volts.
74AHC_AHCT157_2
Product data sheet
Rev. 02 — 9 November 2007
© NXP B.V. 2007. All rights reserved.
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